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Akai H, Yasaka K, Sugawara H, Furuta T, Tajima T, Kato S, Yamaguchi H, Ohtomo K, Abe O, Kiryu S. Faster acquisition of magnetic resonance imaging sequences of the knee via deep learning reconstruction: a volunteer study. Clin Radiol 2024; 79:453-459. [PMID: 38614869 DOI: 10.1016/j.crad.2024.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 12/29/2023] [Accepted: 03/02/2024] [Indexed: 04/15/2024]
Abstract
AIM To evaluate whether deep learning reconstruction (DLR) can accelerate the acquisition of magnetic resonance imaging (MRI) sequences of the knee for clinical use. MATERIALS AND METHODS Using a 1.5-T MRI scanner, sagittal fat-suppressed T2-weighted imaging (fs-T2WI), coronal proton density-weighted imaging (PDWI), and coronal T1-weighted imaging (T1WI) were performed. DLR was applied to images with a number of signal averages (NSA) of 1 to obtain 1DLR images. Then 1NSA, 1DLR, and 4NSA images were compared subjectively, and by noise (standard deviation of intra-articular water or medial meniscus) and contrast-to-noise ratio between two anatomical structures or between an anatomical structure and intra-articular water. RESULTS Twenty-seven healthy volunteers (age: 40.6 ± 11.9 years) were enrolled. Three 1DLR image sequences were obtained within 200 s (approximately 12 minutes for 4NSA image). According to objective evaluations, PDWI 1DLR images showed the smallest noise and significantly higher contrast than 1NSA and 4NSA images. For fs-T2WI, smaller noise and higher contrast were observed in the order of 4NSA, 1DLR, and 1NSA images. According to the subjective analysis, structure visibility, image noise, and overall image quality were significantly better for PDWI 1DLR than 1NSA images; moreover, the visibility of the meniscus and bone, image noise, and overall image quality were significantly better for 1DLR than 4NSA images. Fs-T2WI and T1WI 1DLR images showed no difference between 1DLR and 4NSA images. CONCLUSION Compared to PDWI 4NSA images, PDWI 1DLR images were of higher quality, while the quality of fs-T2WI and T1WI 1DLR images was similar to that of 4NSA images.
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Affiliation(s)
- H Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan; Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - K Yasaka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan; Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - H Sugawara
- Department of Diagnostic Radiology, McGill University, 1650 Cedar Avenue, Montreal, Quebec, H3G 1A4, Canada
| | - T Furuta
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - T Tajima
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan; Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - S Kato
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - H Yamaguchi
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - K Ohtomo
- International University of Health and Welfare, 2600-1 Kiakanemaru, Ohtawara, Tochigi, 324-8501, Japan
| | - O Abe
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - S Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan.
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Suzuki S, Kunimatsu A, Tajima T, Suzuki S, Nagayoshi Y, Hayashi Y, Aida S, Kiryu S. Spontaneous rupture of a uterine leiomyoma accompanied by a hematoma appearing as a cystic lesion on imaging: A case report. Radiol Case Rep 2024; 19:2139-2142. [PMID: 38645545 PMCID: PMC11026929 DOI: 10.1016/j.radcr.2024.02.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 02/12/2024] [Indexed: 04/23/2024] Open
Abstract
The rupture of a uterine leiomyoma is a rare complication. We report a case of ruptured leiomyoma that formed a hematoma that was initially suggestive of an ovarian origin. Magnetic resonance imaging revealed intact ovaries and a cystic lesion adjacent to leiomyomas. During surgery, the cystic lesion was found to be a hematoma caused by a rupture of the leiomyoma.
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Affiliation(s)
- Satoshi Suzuki
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Akira Kunimatsu
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Taku Tajima
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Shu Suzuki
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Yoko Nagayoshi
- Department of Gynecology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Yuichiro Hayashi
- Department of Anatomic Pathology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Shinsuke Aida
- Department of Diagnostic Pathology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
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Yasaka K, Uehara S, Kato S, Watanabe Y, Tajima T, Akai H, Yoshioka N, Akahane M, Ohtomo K, Abe O, Kiryu S. Super-resolution Deep Learning Reconstruction Cervical Spine 1.5T MRI: Improved Interobserver Agreement in Evaluations of Neuroforaminal Stenosis Compared to Conventional Deep Learning Reconstruction. J Imaging Inform Med 2024:10.1007/s10278-024-01112-y. [PMID: 38671337 DOI: 10.1007/s10278-024-01112-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 03/28/2024] [Accepted: 04/01/2024] [Indexed: 04/28/2024]
Abstract
The aim of this study was to investigate whether super-resolution deep learning reconstruction (SR-DLR) is superior to conventional deep learning reconstruction (DLR) with respect to interobserver agreement in the evaluation of neuroforaminal stenosis using 1.5T cervical spine MRI. This retrospective study included 39 patients who underwent 1.5T cervical spine MRI. T2-weighted sagittal images were reconstructed with SR-DLR and DLR. Three blinded radiologists independently evaluated the images in terms of the degree of neuroforaminal stenosis, depictions of the vertebrae, spinal cord and neural foramina, sharpness, noise, artefacts and diagnostic acceptability. In quantitative image analyses, a fourth radiologist evaluated the signal-to-noise ratio (SNR) by placing a circular or ovoid region of interest on the spinal cord, and the edge slope based on a linear region of interest placed across the surface of the spinal cord. Interobserver agreement in the evaluations of neuroforaminal stenosis using SR-DLR and DLR was 0.422-0.571 and 0.410-0.542, respectively. The kappa values between reader 1 vs. reader 2 and reader 2 vs. reader 3 significantly differed. Two of the three readers rated depictions of the spinal cord, sharpness, and diagnostic acceptability as significantly better with SR-DLR than with DLR. Both SNR and edge slope (/mm) were also significantly better with SR-DLR (12.9 and 6031, respectively) than with DLR (11.5 and 3741, respectively) (p < 0.001 for both). In conclusion, compared to DLR, SR-DLR improved interobserver agreement in the evaluations of neuroforaminal stenosis using 1.5T cervical spine MRI.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Shunichi Uehara
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shimpei Kato
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Yusuke Watanabe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Taku Tajima
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Hiroyuki Akai
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Naoki Yoshioka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Masaaki Akahane
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 Ktiakanemaru, Ohtawara, Tochigi, 324-8501, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan.
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Yoshiura T, Kiryu S. FAIR: a recipe for ensuring fairness in healthcare artificial intelligence. Jpn J Radiol 2024; 42:1-2. [PMID: 37540464 DOI: 10.1007/s11604-023-01478-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Affiliation(s)
- Takashi Yoshiura
- Department of Radiology, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 8908544, Japan.
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, 286-0124, Japan
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Guo H, Yang B, Kiryu S, Wang Q, Yu D, Sun Z, Chen Y, Li X, Wang F, Ba X. Evaluation of the relations between reproduction-related pituitary and ovarian hormones and abdominal fat area-related variables determined with computed tomography in overweight or obese women who have undergone bariatric surgery: a cross-sectional study. Quant Imaging Med Surg 2023; 13:7065-7076. [PMID: 37869350 PMCID: PMC10585523 DOI: 10.21037/qims-22-1283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Accepted: 08/22/2023] [Indexed: 10/24/2023]
Abstract
Background An understanding of the associations between midregion fat depots and systemic hormone levels will be crucial for developing health-promotion messages aimed at overweight or obese women. However, related research in this area is rare. The present study was performed to identify and quantify fat-related reproduction pituitary and ovarian hormones in overweight or obese women. Methods A total of 250 eligible overweight or obese women scheduled to undergo laparoscopic sleeve gastrectomy (LSG) from a single center were retrospectively included in this study. Computed tomography (CT) images at the level of the umbilicus were selected, and abdominal fat areas were measured and calculated. The reproduction-related pituitary and ovarian hormones were also measured. The correlations among the parameters were examined using Spearman correlation test. Multiple linear regression analysis was performed after log and β-transformation of the hormone levels and fat area-related variables. Results Positive correlations were detected for prolactin (PRL) with total fat area (TFA) [β=0.045; P=0.029; 95% confidence interval (CI): 0.004-0.085] and subcutaneous fat area (SFA) (β=0.066; P=0.023; 95% CI: 0.009-0.123), whereas estradiol showed a negative correlation with visceral fat area (VFA) (β=-0.056, P=0.005; 95% CI: -0.096 to -0.017) and relative VFA (rVFA) (β=-0.068; P=0.001; 95% CI: -0.109 to -0.027) and a positive correlation with SFA (β=0.036; P=0.042; 95% CI: 0.001-0.071). Progesterone (PROG) was negatively correlated with both VFA (β=-0.037; P=0.002; 95% CI: -0.061 to -0.013) and rVFA (β=-0.039; P=0.002; 95% CI: -0.063 to -0.014). The final results revealed that TFA was increased by 3.1% and SFA was increased by 4.7% with a doubling of PRL concentration; VFA was reduced by 2.5% and rVFA was reduced by 2.6% with a doubling of PROG concentration; and VFA was reduced by 3.8%, rVFA was reduced by 4.6%, and SFA was increased by 2.5% with a doubling of estradiol concentration. Conclusions There exist certain associations between some reproduction-related pituitary and ovarian hormones and fat areas. Our findings provide new insights into the associations between midregion fat depots and systemic hormone levels in overweight or obese women.
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Affiliation(s)
- Hao Guo
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
- Department of Radiology, Yantai Yuhuangding Hospital, Qingdao University School of Medicine, Yantai, China
| | - Bo Yang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
- Department of Radiology, Qingzhou People’s Hospital, Qingzhou, China
| | - Shigeru Kiryu
- Department of Radiology, Narita Hospital, International University of Health and Welfare, Narita City, Chiba, Japan
| | - Qing Wang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
| | - Dexin Yu
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
| | - Zehua Sun
- Department of Radiology, Yantai Yuhuangding Hospital, Qingdao University School of Medicine, Yantai, China
| | - Yang Chen
- Department of Radiology, Yantai Yuhuangding Hospital, Qingdao University School of Medicine, Yantai, China
- Department of Medical Imaging, Weifang Medical University, Weifang, China
| | - Xin Li
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
- Department of Radiology, Tengzhou Central People’s Hospital, Tengzhou, China
| | - Fang Wang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
| | - Xinru Ba
- Department of Radiology, Yantaishan Hospital, Yantai, China
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Kunimatsu N, Kunimatsu A, Miura K, Mori I, Kiryu S. Differentiation between pleomorphic adenoma and schwannoma in the parapharyngeal space: histogram analysis of apparent diffusion coefficient. Dentomaxillofac Radiol 2023; 52:20230140. [PMID: 37665011 PMCID: PMC10552127 DOI: 10.1259/dmfr.20230140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 06/11/2023] [Accepted: 06/15/2023] [Indexed: 09/05/2023] Open
Abstract
OBJECTIVES To elucidate the differences between pleomorphic adenomas and schwannomas occurring in the parapharyngeal space by histogram analyses of apparent diffusion coefficient (ADC) values measured with diffusion-weighted MRI. METHODS This retrospective study included 29 patients with pleomorphic adenoma and 22 patients with schwannoma arising in the parapharyngeal space or extending into the parapharyngeal space from the parotid region. Using pre-operative MR images, ADC values of tumor lesions showing the maximum diameter were measured. The regions of interest for ADC measurement were placed by contouring the tumor margin, and the histogram metrics of ADC values were compared between pleomorphic adenomas and schwannomas regarding the mean, skewness, and kurtosis by Wilcoxon's rank sum test. Subsequent to the primary analysis which included all lesions, we performed two subgroup analyses regarding b-values and magnetic field strength used for MRI. RESULTS The mean ADC values did not show significant differences between pleomorphic adenomas and schwannomas for the primary and subgroup analyses. Schwannomas showed higher skewness (p = 0.0001) and lower kurtosis (p = 0.003) of ADC histograms compared with pleomorphic adenomas in the primary analysis. Skewness was significantly higher in schwannomas in all the subgroup analyses. Kurtosis was consistently lower in schwannomas but did not reach statistical significance in one subgroup analysis. CONCLUSIONS Skewness and kurtosis showed significant differences between pleomorphic adenomas and schwannomas occupying the parapharyngeal space, but the mean ADC values did not. Our results suggest that the skewness and kurtosis of ADC histograms may be useful in differentiating these two parapharyngeal tumors.
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Affiliation(s)
| | - Akira Kunimatsu
- Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan
| | - Koki Miura
- Department of Head and Neck Oncology and Surgery, International University of Health and Welfare Mita Hospital, Tokyo, Japan
| | | | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, Chiba, Japan
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Tajima T, Akai H, Yasaka K, Kunimatsu A, Yoshioka N, Akahane M, Ohtomo K, Abe O, Kiryu S. Comparison of 1.5 T and 3 T magnetic resonance angiography for detecting cerebral aneurysms using deep learning-based computer-assisted detection software. Neuroradiology 2023; 65:1473-1482. [PMID: 37646791 DOI: 10.1007/s00234-023-03216-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 08/22/2023] [Indexed: 09/01/2023]
Abstract
PURPOSE To compare the diagnostic performance of 1.5 T versus 3 T magnetic resonance angiography (MRA) for detecting cerebral aneurysms with clinically available deep learning-based computer-assisted detection software (EIRL aneurysm® [EIRL_an]), which has been approved by the Japanese Pharmaceuticals and Medical Devices Agency. We also sought to analyze the causes of potential false positives. METHODS In this single-center, retrospective study, we evaluated the MRA scans of 90 patients who underwent head MRA (1.5 T and 3 T in 45 patients each) in clinical practice. Overall, 51 patients had 70 aneurysms. We used MRI from a vendor not included in the dataset used to create the EIRL_an algorithm. Two radiologists determined the ground truth, the accuracy of the candidates noted by EIRL_an, and the causes of false positives. The sensitivity, number of false positives per case (FPs/case), and the causes of false positives were compared between 1.5 T and 3 T MRA. Pearson's χ2 test, Fisher's exact test, and the Mann‒Whitney U test were used for the statistical analyses as appropriate. RESULTS The sensitivity was high for 1.5 T and 3 T MRA (0.875‒1), but the number of FPs/case was significantly higher with 3 T MRA (1.511 vs. 2.578, p < 0.001). The most common causes of false positives (descending order) were the origin/bifurcation of vessels/branches, flow-related artifacts, and atherosclerosis and were similar between 1.5 T and 3 T MRA. CONCLUSION EIRL_an detected significantly more false-positive lesions with 3 T than with 1.5 T MRA in this external validation study. Our data may help physicians with limited experience with MRA to correctly diagnose aneurysms using EIRL_an.
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Affiliation(s)
- Taku Tajima
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-Ku, Tokyo, 108-8329, Japan
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Hiroyuki Akai
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-Ku, Tokyo, 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo, 113-0033, Japan
| | - Akira Kunimatsu
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-Ku, Tokyo, 108-8329, Japan
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Naoki Yoshioka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Masaaki Akahane
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 Kitakanamaru, Otawara, Tochigi, 324-8501, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo, 113-0033, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan.
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Akai H, Yasaka K, Sugawara H, Tajima T, Akahane M, Yoshioka N, Ohtomo K, Abe O, Kiryu S. Commercially Available Deep-learning-reconstruction of MR Imaging of the Knee at 1.5T Has Higher Image Quality Than Conventionally-reconstructed Imaging at 3T: A Normal Volunteer Study. Magn Reson Med Sci 2023; 22:353-360. [PMID: 35811127 PMCID: PMC10449552 DOI: 10.2463/mrms.mp.2022-0020] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 05/22/2022] [Indexed: 11/09/2022] Open
Abstract
PURPOSE This study aimed to evaluate whether the image quality of 1.5T magnetic resonance imaging (MRI) of the knee is equal to or higher than that of 3T MRI by applying deep learning reconstruction (DLR). METHODS Proton density-weighted images of the right knee of 27 healthy volunteers were obtained by 3T and 1.5T MRI scanners using similar imaging parameters (21 for high resolution image and 6 for normal resolution image). Commercially available DLR was applied to the 1.5T images to obtain 1.5T/DLR images. The 3T and 1.5T/DLR images were compared subjectively for visibility of structures, image noise, artifacts, and overall diagnostic acceptability and objectively. One-way ANOVA and Friedman tests were used for the statistical analyses. RESULTS For the high resolution images, all of the anatomical structures, except for bone, were depicted significantly better on the 1.5T/DLR compared with 3T images. Image noise scored statistically lower and overall diagnostic acceptability scored higher on the 1.5T/DLR images. The contrast between lateral meniscus and articular cartilage of the 1.5T/DLR images was significantly higher (5.89 ± 1.30 vs. 4.34 ± 0.87, P < 0.001), and also the contrast between medial meniscus and articular cartilage of the 1.5T/DLR images was significantly higher (5.12 ± 0.93 vs. 3.87 ± 0.56, P < 0.001). Similar image quality improvement by DLR was observed for the normal resolution images. CONCLUSION The 1.5T/DLR images can achieve less noise, more precise visualization of the meniscus and ligaments, and higher overall image quality compared with the 3T images acquired using a similar protocol.
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Affiliation(s)
- Hiroyuki Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Chiba, Japan
| | - Koichiro Yasaka
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Chiba, Japan
- Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Haruto Sugawara
- Department of Radiology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Taku Tajima
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Chiba, Japan
- Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan
| | - Masaaki Akahane
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Chiba, Japan
| | - Naoki Yoshioka
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Chiba, Japan
| | - Kuni Ohtomo
- Department of Radiology, International University of Health and Welfare, Ohtawara, Tochigi, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Chiba, Japan
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Kiryu S, Akai H, Yasaka K, Tajima T, Kunimatsu A, Yoshioka N, Akahane M, Abe O, Ohtomo K. Clinical Impact of Deep Learning Reconstruction in MRI. Radiographics 2023; 43:e220133. [PMID: 37200221 DOI: 10.1148/rg.220133] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Deep learning has been recognized as a paradigm-shifting tool in radiology. Deep learning reconstruction (DLR) has recently emerged as a technology used in the image reconstruction process of MRI, which is an essential procedure in generating MR images. Denoising, which is the first DLR application to be realized in commercial MRI scanners, improves signal-to-noise ratio. When applied to lower magnetic field-strength scanners, the signal-to-noise ratio can be increased without extending the imaging time, and image quality is comparable to that of higher-field-strength scanners. Shorter imaging times decrease patient discomfort and reduce MRI scanner running costs. The incorporation of DLR into accelerated acquisition imaging techniques, such as parallel imaging or compressed sensing, shortens the reconstruction time. DLR is based on supervised learning using convolutional layers and is divided into the following three categories: image domain, k-space learning, and direct mapping types. Various studies have reported other derivatives of DLR, and several have shown the feasibility of DLR in clinical practice. Although DLR efficiently reduces Gaussian noise from MR images, denoising makes image artifacts more prominent, and a solution to this problem is desired. Depending on the training of the convolutional neural network, DLR may change the imaging features of lesions and obscure small lesions. Therefore, radiologists may need to adopt the habit of questioning whether any information has been lost on images that appear clean. ©RSNA, 2023 Quiz questions for this article are available in the supplemental material.
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Affiliation(s)
- Shigeru Kiryu
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Hiroyuki Akai
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Koichiro Yasaka
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Taku Tajima
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Akira Kunimatsu
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Naoki Yoshioka
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Masaaki Akahane
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Osamu Abe
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
| | - Kuni Ohtomo
- From the Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita 286-0124, Japan (S.K., H.A., K.Y., T.T., A.K., N.Y., M.A.); Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan (H.A.); Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan (K.Y., O.A.); Department of Radiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan (T.T., A.K.); and International University of Health and Welfare, Otawara, Japan (K.O.)
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Yamamoto S, Yonezawa K, Fukata N, Takeshita K, Kodama M, Yamana T, Kiryu S, Okada Y. Value of apparent diffusion coefficient on MRI for prediction of histopathological type in anal fistula cancer. Medicine (Baltimore) 2023; 102:e33281. [PMID: 37026966 PMCID: PMC10082321 DOI: 10.1097/md.0000000000033281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/08/2023] Open
Abstract
The main histopathological types of anal fistula cancers are mucinous adenocarcinoma and tubular adenocarcinoma. The purpose of this study was to investigate the utility of the apparent diffusion coefficient (ADC) value in magnetic resonance imaging (MRI) to determine the histopathological type of an anal fistula cancer, and to investigate the relationship between ADC values and histopathological type (mucinous type or tubular carcinoma), clinical information, and surgical findings. We retrospectively identified 69 patients diagnosed with anal fistula cancer at our hospital from January 2013 to December 2021. Among them, we selected the patients diagnosed using the same 1.5-T MRI machine, underwent surgery, and a pathological sample was obtained during the operation. Finally, these 25 patients were selected for the analysis since they underwent the imaging scan using the same MRI machine. The ADC value was compared between mucinous and tubular adenocarcinomas, and between tumors at the Tis-T1-T2 and T3-T4 stages. Finally, 25 patients were selected. The mean age of the 25 patients included in the analysis was 60.8 ± 13.3 years and all were males. The median ADC of anal fistula cancers was 1.97 × 10-3 mm2/s for mucinous adenocarcinomas and 1.36 × 10-3 mm2/s for tubular adenocarcinomas; this difference was statistically significant (P < .01). Furthermore, the median ADC was 1.62 × 10-3 mm2/s for tumors in Tis-T1-T2 stages and 2.01 × 10-3 mm2/s for T3-T4 tumors (P = .02). The ADC value in MR images may predict the histopathological type and depth of anal fistula cancers. Also, the different ADC values between Tis-T1-T2 and T3-T4 tumors could help predict the classification of progression.
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Affiliation(s)
- Shinji Yamamoto
- Department of Radiological Technology, Tokyo Yamate Medical Center, Tokyo, Japan
- Department of Medical Science, Suzuka University of Medical Science, Graduate School of Medical Science, Mie, Japan
| | - Keiji Yonezawa
- Department of Radiological Technology, Tokyo Yamate Medical Center, Tokyo, Japan
| | - Naoki Fukata
- Department of Radiological Technology, Tokyo Yamate Medical Center, Tokyo, Japan
| | - Koji Takeshita
- Department of Radiology, Tokyo Yamate Medical Center, Tokyo, Japan
| | - Makoto Kodama
- Department of Pathology, Tokyo Yamate Medical Center, Tokyo, Japan
| | - Tetsuro Yamana
- Department of Colorectal Proctology, Tokyo Yamate Medical Center, Tokyo, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, Chiba, Japan
| | - Yukinori Okada
- Department of Medical Science, Suzuka University of Medical Science, Graduate School of Medical Science, Mie, Japan
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
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Ohgami Y, Kotani Y, Yoshida N, Akai H, Kunimatsu A, Kiryu S, Inoue Y. The contralateral effects of anticipated stimuli on brain activity measured by ERP and fMRI. Psychophysiology 2023; 60:e14189. [PMID: 36166644 PMCID: PMC10077996 DOI: 10.1111/psyp.14189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 07/26/2022] [Accepted: 08/30/2022] [Indexed: 01/25/2023]
Abstract
The present study examined the effects of unilateral stimulus presentation on the right hemisphere preponderance of the stimulus-preceding negativity (SPN) in the event-related potential (ERP) experiment, and aimed to elucidate whether unilateral stimulus presentation affected activations in the bilateral anterior insula in the functional magnetic resonance imaging (fMRI) experiment. Separate fMRI and ERP experiments were conducted using visual and auditory stimuli by manipulating the position of stimulus presentation (left side or right side) with the time estimation task. The ERP experiment revealed a significant right hemisphere preponderance during left stimulation and no laterality during the right stimulation. The fMRI experiment revealed that the left anterior insula was activated only in the right stimulation of auditory and visual stimuli whereas the right anterior insula was activated by both left and right stimulations. The visual condition retained a contralateral dominance, but the auditory condition showed a right hemisphere dominance in a localized area. The results of this study indicate that the SPN reflects perceptual anticipation, and also that the anterior insula is involved in its occurrence.
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Affiliation(s)
- Yoshimi Ohgami
- Institute for Liberal Arts, Tokyo Institute of Technology, Tokyo, Japan
| | - Yasunori Kotani
- Institute for Liberal Arts, Tokyo Institute of Technology, Tokyo, Japan
| | - Nobukiyo Yoshida
- Department of Radiology, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Akai
- Department of Radiology, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Akira Kunimatsu
- Department of Medicine, International University of Health and Welfare, Chiba, Japan
| | - Shigeru Kiryu
- Department of Medicine, International University of Health and Welfare, Chiba, Japan
| | - Yusuke Inoue
- Department of Diagnostic Radiology, Kitasato University, Sagamihara, Kanagawa, Japan
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Kabasawa H, Kiryu S. Pulse Sequences and Reconstruction in Fast MR Imaging of the Liver. Magn Reson Med Sci 2023; 22:176-190. [PMID: 36754387 PMCID: PMC10086398 DOI: 10.2463/mrms.rev.2022-0114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
The liver moves with respiratory motion. Respiratory motion causes image artifacts as MRI is a motion-sensitive imaging modality; thus, MRI scan speed improvement has been an important technical development target for liver MRI for years. Recent pulse sequence and image reconstruction technology advancement has realized a fast liver MRI acquisition method. Such new technologies allow us to obtain liver MRI in a shorter time, particularly, within breath-holding time. Other benefits of new the technology and the higher spatial resolution liver MRI within a given scan time are improved slice coverage and smaller pixel size. In this review, MRI pulse sequence and reconstruction technologies to accelerate scan speed for T1- and T2-weighted liver MRI will be discussed. Technologies that reduce scan time while keeping image contrast, SNR and image spatial resolution are needed for fast MRI acquisition. We will discuss the progress of MRI acquisition methods, the enabling technology, established applications, current trends, and the future outlook.
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Affiliation(s)
- Hiroyuki Kabasawa
- Department of Radiological Sciences, School of Healthcare Sciences at Narita, International University of Health and Welfare
| | - Shigeru Kiryu
- Department of Radiology, School of Medicine, International University of Health and Welfare
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Akai H, Yasaka K, Sugawara H, Tajima T, Kamitani M, Furuta T, Akahane M, Yoshioka N, Ohtomo K, Abe O, Kiryu S. Acceleration of knee magnetic resonance imaging using a combination of compressed sensing and commercially available deep learning reconstruction: a preliminary study. BMC Med Imaging 2023; 23:5. [PMID: 36624404 PMCID: PMC9827641 DOI: 10.1186/s12880-023-00962-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 01/04/2023] [Indexed: 01/10/2023] Open
Abstract
PURPOSE To evaluate whether deep learning reconstruction (DLR) accelerates the acquisition of 1.5-T magnetic resonance imaging (MRI) knee data without image deterioration. MATERIALS AND METHODS Twenty-one healthy volunteers underwent MRI of the right knee on a 1.5-T MRI scanner. Proton-density-weighted images with one or four numbers of signal averages (NSAs) were obtained via compressed sensing, and DLR was applied to the images with 1 NSA to obtain 1NSA-DLR images. The 1NSA-DLR and 4NSA images were compared objectively (by deriving the signal-to-noise ratios of the lateral and the medial menisci and the contrast-to-noise ratios of the lateral and the medial menisci and articular cartilages) and subjectively (in terms of the visibility of the anterior cruciate ligament, the medial collateral ligament, the medial and lateral menisci, and bone) and in terms of image noise, artifacts, and overall diagnostic acceptability. The paired t-test and Wilcoxon signed-rank test were used for statistical analyses. RESULTS The 1NSA-DLR images were obtained within 100 s. The signal-to-noise ratios (lateral: 3.27 ± 0.30 vs. 1.90 ± 0.13, medial: 2.71 ± 0.24 vs. 1.80 ± 0.15, both p < 0.001) and contrast-to-noise ratios (lateral: 2.61 ± 0.51 vs. 2.18 ± 0.58, medial 2.19 ± 0.32 vs. 1.97 ± 0.36, both p < 0.001) were significantly higher for 1NSA-DLR than 4NSA images. Subjectively, all anatomical structures (except bone) were significantly clearer on the 1NSA-DLR than on the 4NSA images. Also, in the former images, the noise was lower, and the overall diagnostic acceptability was higher. CONCLUSION Compared with the 4NSA images, the 1NSA-DLR images exhibited less noise, higher overall image quality, and allowed more precise visualization of the menisci and ligaments.
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Affiliation(s)
- Hiroyuki Akai
- grid.26999.3d0000 0001 2151 536XDepartment of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639 Japan ,Present Address: Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba 286-0124 Japan
| | - Koichiro Yasaka
- Present Address: Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba 286-0124 Japan ,grid.26999.3d0000 0001 2151 536XDepartment of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
| | - Haruto Sugawara
- grid.26999.3d0000 0001 2151 536XDepartment of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639 Japan
| | - Taku Tajima
- Present Address: Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba 286-0124 Japan ,grid.415958.40000 0004 1771 6769Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329 Japan
| | - Masaru Kamitani
- grid.26999.3d0000 0001 2151 536XDepartment of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639 Japan
| | - Toshihiro Furuta
- grid.26999.3d0000 0001 2151 536XDepartment of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639 Japan
| | - Masaaki Akahane
- Present Address: Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba 286-0124 Japan
| | - Naoki Yoshioka
- Present Address: Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba 286-0124 Japan
| | - Kuni Ohtomo
- grid.411731.10000 0004 0531 3030International University of Health and Welfare, 2600-1 Kiakanemaru, Ohtawara, Tochigi 324-8501 Japan
| | - Osamu Abe
- grid.26999.3d0000 0001 2151 536XDepartment of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
| | - Shigeru Kiryu
- Present Address: Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba 286-0124 Japan
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Akahane M, Yoshioka N, Kiryu S. Radiation Protection of the Eye Lens in Fluoroscopy-guided Interventional Procedures. Interventional Radiology 2022; 7:44-48. [PMID: 36196387 PMCID: PMC9527101 DOI: 10.22575/interventionalradiology.2022-0006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 02/25/2022] [Indexed: 11/04/2022]
Abstract
The medical staff involved in fluoroscopy-guided procedures are at potential risks of radiation-induced cataract. Therefore, proper monitoring of the lens doses is critical, and radiation protection should be provided to the maximum extent that is reasonably achievable. The collar dosimeter is necessary to avoid underestimation of the lens dose, and the third dosimeter behind the protective eyewear would be helpful for those who are likely to exceed the dose limit. The reduction of the patient doses will correspondingly reduce the staff doses. Proper placement of the ceiling-mounted shields and minimization of the face-to-glass gap are the keys to effective shielding. The optimization of procedures and devices that help maintain a distance from the irradiated area and to prevent the looking-up posture will substantially reduce the lens dose.
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Affiliation(s)
- Masaaki Akahane
- Department of Radiology, School of Medicine, International University of Health and Welfare
| | - Naoki Yoshioka
- Department of Radiology, School of Medicine, International University of Health and Welfare
| | - Shigeru Kiryu
- Department of Radiology, School of Medicine, International University of Health and Welfare
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Tajima T, Akai H, Sugawara H, Furuta T, Yasaka K, Kunimatsu A, Yoshioka N, Akahane M, Abe O, Ohtomo K, Kiryu S. Feasibility of accelerated whole-body diffusion-weighted imaging using a deep learning-based noise-reduction technique in patients with prostate cancer. Magn Reson Imaging 2022; 92:169-179. [PMID: 35772583 DOI: 10.1016/j.mri.2022.06.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 06/04/2022] [Accepted: 06/23/2022] [Indexed: 11/25/2022]
Abstract
PURPOSE To assess the possibility of reducing the image acquisition time for diffusion-weighted whole-body imaging with background body signal suppression (DWIBS) by denoising with deep learning-based reconstruction (dDLR). METHODS Seventeen patients with prostate cancer who underwent DWIBS by 1.5 T magnetic resonance imaging with a number of excitations of 2 (NEX2) and 8 (NEX8) were prospectively enrolled. The NEX2 image data were processed by dDLR (dDLR-NEX2), and the NEX2, dDLR-NEX2, and NEX8 image data were analyzed. In qualitative analysis, two radiologists rated the perceived coarseness, conspicuity of metastatic lesions (lymph nodes and bone), and overall image quality. The contrast-to-noise ratios (CNRs), contrast ratios, and mean apparent diffusion coefficients (ADCs) of metastatic lesions were calculated in a quantitative analysis. RESULTS The image acquisition time of NEX2 was 2.8 times shorter than that of NEX8 (3 min 30 s vs 9 min 48 s). The perceived coarseness and overall image quality scores reported by both readers were significantly higher for dDLR-NEX2 than for NEX2 (P = 0.005-0.040). There was no significant difference between dDLR-NEX2 and NEX8 in the qualitative analysis. The CNR of bone metastasis was significantly greater for dDLR-NEX2 than for NEX2 and NEX8 (P = 0.012 for both comparisons). The contrast ratios and mean ADCs were not significantly different among the three image types. CONCLUSIONS dDLR improved the image quality of DWIBS with NEX2. In the context of lymph node and bone metastasis evaluation with DWIBS in patients with prostate cancer, dDLR-NEX2 has potential to be an alternative to NEX8 and reduce the image acquisition time.
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Affiliation(s)
- Taku Tajima
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo 108-8329, Japan; Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan
| | - Hiroyuki Akai
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan; Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Haruto Sugawara
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Toshihiro Furuta
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan; Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Akira Kunimatsu
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo 108-8329, Japan
| | - Naoki Yoshioka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan
| | - Masaaki Akahane
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 kitakanamaru, Otawara, Tochigi 324-8501, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan.
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Li D, Kiryu S, Wang F. Computed Tomography and Clinical Analysis of Ovarian Mucinous Tumors in Adolescent Patients. J Pediatr Adolesc Gynecol 2022; 35:346-352. [PMID: 34728347 DOI: 10.1016/j.jpag.2021.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/07/2021] [Accepted: 10/18/2021] [Indexed: 11/20/2022]
Abstract
STUDY OBJECTIVE To investigate the clinical and computed tomography features of ovarian mucinous tumors in children and adolescents. DESIGN, SETTING, AND PARTICIPANTS A retrospective analysis of clinical and preoperative computed tomography (CT) data was performed in 59 patients who were 20 years or younger with ovarian mucinous tumors confirmed by histopathology. Patients' age, medical history, symptoms, tumor marker levels, and CT imaging findings were recorded. INTERVENTIONS None. MAIN OUTCOME MEASURES Identification of the clinical and CT features of ovarian mucinous tumors in pediatric and adolescent patients. RESULTS There were 41 mucinous cystadenomas in 39 cases, 12 borderline mucinous cystadenomas in 11 cases, and 9 mucinous cystadenocarcinomas in 9 patients. A total of 55 tumors were multilocular (55/62, 88.7%), including fewer than 10 loculations in 23 tumors, 10-20 loculations in 17 tumors, and over 20 loculations in 15 tumors. Eleven borderline mucinous cystadenomas were multilocular (11/12, 91.7%), with over 10 loculations in 7 tumors (7/12, 58.3%). Twelve tumors appeared as multilocular cystic-solid (12/62, 19.4%), and a case of mucinous cystadenocarcinoma was predominantly solid (1/62, 1.6%). Seventeen tumors showed honeycomb sign and stained glass appearance. Six mural nodules, with sizes ranging from 1.1 to 3.5 cm (average: 2.8 cm), were found in borderline mucinous cystadenoma and mucinous cystadenocarcinoma. CONCLUSIONS The CT findings of ovarian mucinous tumors in children are characteristic. The preoperative CT is helpful in making differential diagnoses.
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Affiliation(s)
- Dumin Li
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
| | - Shigeru Kiryu
- Department of Radiology, Narita Hospital, International University of Health and Welfare, Narita City, Chiba, Japan
| | - Fang Wang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China.
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Oka A, Akamatsu M, Kanai K, Watanabe Y, Imanishi Y, Noguchi Y, Yano H, Kiryu S, Shiomi T, Okano M. A case of bacterial sphenoid sinusitis accompanied by a pituitary abscess. Otolaryngology Case Reports 2022. [DOI: 10.1016/j.xocr.2022.100432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Hayashi Y, Kawabata KC, Tanaka Y, Uehara Y, Mabuchi Y, Murakami K, Nishiyama A, Kiryu S, Yoshioka Y, Ota Y, Sugiyama T, Mikami K, Tamura M, Fukushima T, Asada S, Takeda R, Kunisaki Y, Fukuyama T, Yokoyama K, Uchida T, Hagihara M, Ohno N, Usuki K, Tojo A, Katayama Y, Goyama S, Arai F, Tamura T, Nagasawa T, Ochiya T, Inoue D, Kitamura T. MDS cells impair osteolineage differentiation of MSCs via extracellular vesicles to suppress normal hematopoiesis. Cell Rep 2022; 39:110805. [PMID: 35545056 DOI: 10.1016/j.celrep.2022.110805] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/15/2022] [Accepted: 04/19/2022] [Indexed: 12/13/2022] Open
Abstract
Myelodysplastic syndrome (MDS) is a clonal disorder of hematopoietic stem cells (HSCs), characterized by ineffective hematopoiesis and frequent progression to leukemia. It has long remained unresolved how MDS cells, which are less proliferative, inhibit normal hematopoiesis and eventually dominate the bone marrow space. Despite several studies implicating mesenchymal stromal or stem cells (MSCs), a principal component of the HSC niche, in the inhibition of normal hematopoiesis, the molecular mechanisms underlying this process remain unclear. Here, we demonstrate that both human and mouse MDS cells perturb bone metabolism by suppressing the osteolineage differentiation of MSCs, which impairs the ability of MSCs to support normal HSCs. Enforced MSC differentiation rescues the suppressed normal hematopoiesis in both in vivo and in vitro MDS models. Intriguingly, the suppression effect is reversible and mediated by extracellular vesicles (EVs) derived from MDS cells. These findings shed light on the novel MDS EV-MSC axis in ineffective hematopoiesis.
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Affiliation(s)
- Yasutaka Hayashi
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan; Department of Hematology-Oncology, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Minatojimaminami-machi, Chuo-ku, Kobe 650-0047, Japan
| | - Kimihito C Kawabata
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan; Division of Hematology/Medical Oncology, Department of Medicine, Weill-Cornell Medical College, Cornell University, NY 10021, USA
| | - Yosuke Tanaka
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Yasufumi Uehara
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan; Center for Cellular and Molecular Medicine, Kyushu University Hospital, Fukuoka 812-8582, Japan
| | - Yo Mabuchi
- Department of Biochemistry and Biophysics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Koichi Murakami
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama 236-0043, Japan; Advanced Medical Research Center, Yokohama City University, Yokohama 236-0043, Japan
| | - Akira Nishiyama
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama 236-0043, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, Chiba 286-8686, Japan
| | - Yusuke Yoshioka
- Department of Molecular and Cellular Medicine, Institute of Medical Science, Tokyo Medical University, Tokyo 160-0023, Japan
| | - Yasunori Ota
- Department of Pathology, Research Hospital, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
| | - Tatsuki Sugiyama
- Laboratory of Stem Cell Biology and Developmental Immunology, Graduate School of Frontier Biosciences and Graduate School of Medicine, WPI Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan
| | - Keiko Mikami
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Moe Tamura
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan; Division of Molecular Oncology, Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, Tokyo 108-8639, Japan
| | - Tsuyoshi Fukushima
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Shuhei Asada
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Reina Takeda
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Yuya Kunisaki
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan; Center for Cellular and Molecular Medicine, Kyushu University Hospital, Fukuoka 812-8582, Japan
| | - Tomofusa Fukuyama
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Kazuaki Yokoyama
- Department of Hematology/Oncology, Research Hospital, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
| | - Tomoyuki Uchida
- Department of Hematology, Eiju General Hospital, Tokyo 110-8645, Japan
| | - Masao Hagihara
- Department of Hematology, Eiju General Hospital, Tokyo 110-8645, Japan
| | - Nobuhiro Ohno
- Department of Hematology, Kanto Rosai Hospital, Kawasaki 211-8510, Japan
| | - Kensuke Usuki
- Department of Hematology, NTT Medical Center Tokyo, Tokyo 141-8625, Japan
| | - Arinobu Tojo
- Department of Hematology/Oncology, Research Hospital, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan; Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | | | - Susumu Goyama
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan; Division of Molecular Oncology, Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, Tokyo 108-8639, Japan
| | - Fumio Arai
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Tomohiko Tamura
- Department of Biochemistry and Biophysics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan; Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama 236-0043, Japan
| | - Takashi Nagasawa
- Laboratory of Stem Cell Biology and Developmental Immunology, Graduate School of Frontier Biosciences and Graduate School of Medicine, WPI Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan
| | - Takahiro Ochiya
- Department of Molecular and Cellular Medicine, Institute of Medical Science, Tokyo Medical University, Tokyo 160-0023, Japan
| | - Daichi Inoue
- Department of Hematology-Oncology, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Minatojimaminami-machi, Chuo-ku, Kobe 650-0047, Japan.
| | - Toshio Kitamura
- Division of Cellular Therapy, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
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Kunimatsu N, Kunimatsu A, Uchida Y, Mori I, Kiryu S. Whole-lesion histogram analysis of apparent diffusion coefficient for the assessment of non-mass enhancement lesions on breast MRI. J Clin Imaging Sci 2022; 12:12. [PMID: 35414962 PMCID: PMC8992364 DOI: 10.25259/jcis_201_2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 03/06/2022] [Indexed: 11/05/2022] Open
Abstract
Objectives To investigate the application of apparent diffusion coefficient (ADC) histogram analysis in differentiating between benign and malignant breast lesions detected as non-mass enhancement on MRI. Materials and Methods A retrospective study was conducted for 25 malignant and 26 benign breast lesions showing non-mass enhancement on breast MRI. An experienced radiologist without prior knowledge of the pathological results drew a region of interest (ROI) outlining the periphery of each lesion on the ADC map. A histogram was then made for each lesion. Following a univariate analysis of 18 summary statistics values, we conducted statistical discrimination after hierarchical clustering using Ward’s method. A comparison between the malignant and the benign groups was made using multiple logistic regression analysis and the Mann-Whitney U test. A P -value of less than 0.05 was considered statistically significant. Results Univariate analysis for the 18 summary statistics values showed the malignant group had greater entropy (P < 0.001) and lower uniformity (P < 0.001). While there was no significant difference in mean and skewness values, the malignant group tended to show a lower mean (P = 0.090) and a higher skewness (P = 0.065). Hierarchical clustering of the 18 summary statistics values identified four values (10th percentile, entropy, skewness, and uniformity) of which the 10th percentile values were significantly lower for the malignant group (P = 0.035). Conclusions Whole-lesion ADC histogram analysis may be useful for differentiating malignant from benign lesions which show non-mass enhancement on breast MRI.
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Affiliation(s)
- Natsuko Kunimatsu
- Department of Radiology, Sanno Hospital, Akasaka, Minato–ku, Tokyo, Japan
| | - Akira Kunimatsu
- Department of Radiology, International University of Health and Welfare, Mita Hospital, Minato–ku, Tokyo, Japan,
| | - Yoshihiro Uchida
- Department of Breast Surgery, Sanno Medical Center, Akasaka, Minato–ku, Tokyo, Japan,
| | - Ichiro Mori
- Diagnostic Pathology Center, International University of Health and Welfare, Kozunomori 4–3, Narita, Chiba, Japan,
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare, Kozunomori 4–3, Narita, Chiba, Japan,
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Fujita S, Hagiwara A, Yasaka K, Akai H, Kunimatsu A, Kiryu S, Fukunaga I, Kato S, Akashi T, Kamagata K, Wada A, Abe O, Aoki S. Radiomics with 3-dimensional magnetic resonance fingerprinting: influence of dictionary design on repeatability and reproducibility of radiomic features. Eur Radiol 2022; 32:4791-4800. [PMID: 35304637 PMCID: PMC9213334 DOI: 10.1007/s00330-022-08555-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 11/23/2021] [Accepted: 12/23/2021] [Indexed: 11/17/2022]
Abstract
Objectives We aimed to investigate the influence of magnetic resonance fingerprinting (MRF) dictionary design on radiomic features using in vivo human brain scans. Methods Scan-rescans of three-dimensional MRF and conventional T1-weighted imaging were performed on 21 healthy volunteers (9 males and 12 females; mean age, 41.3 ± 14.6 years; age range, 22–72 years). Five patients with multiple sclerosis (3 males and 2 females; mean age, 41.2 ± 7.3 years; age range, 32–53 years) were also included. MRF data were reconstructed using various dictionaries with different step sizes. First- and second-order radiomic features were extracted from each dataset. Intra-dictionary repeatability and inter-dictionary reproducibility were evaluated using intraclass correlation coefficients (ICCs). Features with ICCs > 0.90 were considered acceptable. Relative changes were calculated to assess inter-dictionary biases. Results The overall scan-rescan ICCs of MRF-based radiomics ranged from 0.86 to 0.95, depending on dictionary step size. No significant differences were observed in the overall scan-rescan repeatability of MRF-based radiomic features and conventional T1-weighted imaging (p = 1.00). Intra-dictionary repeatability was insensitive to dictionary step size differences. MRF-based radiomic features varied among dictionaries (overall ICC for inter-dictionary reproducibility, 0.62–0.99), especially when step sizes were large. First-order and gray level co-occurrence matrix features were the most reproducible feature classes among different step size dictionaries. T1 map-derived radiomic features provided higher repeatability and reproducibility among dictionaries than those obtained with T2 maps. Conclusion MRF-based radiomic features are highly repeatable in various dictionary step sizes. Caution is warranted when performing MRF-based radiomics using datasets containing maps generated from different dictionaries. Key Points • MRF-based radiomic features are highly repeatable in various dictionary step sizes. • Use of different MRF dictionaries may result in variable radiomic features, even when the same MRF acquisition data are used. • Caution is needed when performing radiomic analysis using data reconstructed from different dictionaries. Supplementary Information The online version contains supplementary material available at 10.1007/s00330-022-08555-3.
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Affiliation(s)
- Shohei Fujita
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan. .,Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8654, Japan.
| | - Akifumi Hagiwara
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan
| | - Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shiroganedai, Minato, Tokyo, 108-8639, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shiroganedai, Minato, Tokyo, 108-8639, Japan
| | - Akira Kunimatsu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1, Shiroganedai, Minato, Tokyo, 108-8639, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852, Hatakeda, Narita, Chiba, 286-8520, Japan
| | - Issei Fukunaga
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan
| | - Shimpei Kato
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan.,Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8654, Japan
| | - Toshiaki Akashi
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan
| | - Koji Kamagata
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan
| | - Akihiko Wada
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8654, Japan
| | - Shigeki Aoki
- Department of Radiology, Juntendo University School of Medicine, 1-2-1, Hongo, Bunkyo, Tokyo, 113-8421, Japan
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21
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Sato M, Shiba T, Jinushi C, Sawaya Y, Kiryu S, Abe M, Urano T. [An improved driving ability after attention function training for safe driving via use of a day rehabilitation service in a patient with cerebral infarction]. Nihon Ronen Igakkai Zasshi 2022; 59:102-109. [PMID: 35264524 DOI: 10.3143/geriatrics.59.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In recent years, the assessment of and support for the safety of driving for people with higher brain dysfunction to allow them to resume car driving have become issues to be addressed in Japan. It is difficult to determine whether or not people with higher brain dysfunction may safely resume car driving; in addition, methods of supporting this resumption have not been established. To support people with higher brain dysfunction and allow them to live at home in areas where public means of transportation may be insufficient, initiatives promoting the resumption of car driving are necessary in healthcare sectors, including day rehabilitation facilities. We provided support to a patient with an attention disorder due to left thalamic infarction, with the aim of achieving sufficient independence to drive a car, in a day rehabilitation facility. We herein report this case from the perspective of a speech-language-hearing therapist. The patient was a right-handed man in his 60s who had higher brain dysfunction with attention disorder as the main symptom. No marked motor paralysis of the extremities was observed. Use of a day rehabilitation service was started approximately two months after the onset of symptoms. Rehabilitation and support aimed at the resumption of car driving were provided approximately one month after the start of the day rehabilitation service use. To determine whether or not the patient was fit to drive a car, higher brain function tests for the intellectual function, attention function, and frontal function, as well as a theoretical evaluation based on the Stroke Drivers' Screening Assessment Japanese Version (J-SDSA) and monitoring of daily behaviors were performed. In addition, after the patient was given permission from an attending physician to drive a car on the condition that the patient did not drive fast and the patient's wife always accompanied him while driving, a safety assessment was also performed. As a result, approximately 10 months later, the J-SDSA theoretical evaluation score showed a passing grade, in contrast to the failing grade he had previously earned. Furthermore, errors in performing household activities due to a decreased attention function became unremarkable with respect to daily behaviors; therefore, we determined, together with the attending physician, that the patient now had sufficient independence to drive a car. In our day rehabilitation facility, the number of requests for advice on car driving from people with higher brain dysfunction living in the community had been increasing. Multisectoral assessments, training, and instruction should be continued in collaboration with attending physicians, other facilities located within the community, and driving schools in order to support people with higher brain dysfunction and help them once again be able to drive a car.
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Affiliation(s)
- Miho Sato
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
| | - Takahiro Shiba
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
| | - Chihiro Jinushi
- Department of Speech and Hearing Sciences, School of Health Science, International University of Health and Welfare
| | - Yohei Sawaya
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
- Department of Physical Therapy, School of Health Science, International University of Health and Welfare
| | - Shigeru Kiryu
- Department of Radiology, School of Medicine, International University of Health and Welfare
| | - Masako Abe
- Department of Speech and Hearing Sciences, School of Health Science, International University of Health and Welfare
| | - Tomohiko Urano
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
- Department of Geriatric Medicine, School of Medicine, International University of Health and Welfare
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22
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Yasaka K, Akai H, Sugawara H, Tajima T, Akahane M, Yoshioka N, Kabasawa H, Miyo R, Ohtomo K, Abe O, Kiryu S. Impact of deep learning reconstruction on intracranial 1.5 T magnetic resonance angiography. Jpn J Radiol 2021; 40:476-483. [PMID: 34851499 PMCID: PMC9068615 DOI: 10.1007/s11604-021-01225-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 11/21/2021] [Indexed: 12/22/2022]
Abstract
Purpose The purpose of this study was to evaluate whether deep learning reconstruction (DLR) improves the image quality of intracranial magnetic resonance angiography (MRA) at 1.5 T. Materials and methods In this retrospective study, MRA images of 40 patients (21 males and 19 females; mean age, 65.8 ± 13.2 years) were reconstructed with and without the DLR technique (DLR image and non-DLR image, respectively). Quantitative image analysis was performed by placing regions of interest on the basilar artery and cerebrospinal fluid in the prepontine cistern. We calculated the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) for analyses of the basilar artery. Two experienced radiologists evaluated the depiction of structures (the right internal carotid artery, right ophthalmic artery, basilar artery, and right superior cerebellar artery), artifacts, subjective noise and overall image quality in a qualitative image analysis. Scores were compared in the quantitative and qualitative image analyses between the DLR and non-DLR images using Wilcoxon signed-rank tests. Results The SNR and CNR for the basilar artery were significantly higher for the DLR images than for the non-DLR images (p < 0.001). Qualitative image analysis scores (p < 0.003 and p < 0.005 for readers 1 and 2, respectively), excluding those for artifacts (p = 0.072–0.565), were also significantly higher for the DLR images than for the non-DLR images. Conclusion DLR enables the production of higher quality 1.5 T intracranial MRA images with improved visualization of arteries.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.,Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba, 286-8520, Japan
| | - Hiroyuki Akai
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba, 286-8520, Japan.,Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Haruto Sugawara
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Taku Tajima
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba, 286-8520, Japan.,Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - Masaaki Akahane
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba, 286-8520, Japan
| | - Naoki Yoshioka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba, 286-8520, Japan
| | - Hiroyuki Kabasawa
- Department of Radiological Sciences, School of Health Sciences at Narita, International University of Health and Welfare, 4-3 Kozunomori, Chiba, 286-8686, Japan
| | - Rintaro Miyo
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 kitakanamaru, Otawara, Tochigi, 324-8501, Japan
| | - Osamu Abe
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba, 286-8520, Japan.
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23
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Tajima T, Akai H, Sugawara H, Yasaka K, Kunimatsu A, Yoshioka N, Akahane M, Ohtomo K, Abe O, Kiryu S. Breath-hold 3D magnetic resonance cholangiopancreatography at 1.5 T using a deep learning-based noise-reduction approach: Comparison with the conventional respiratory-triggered technique. Eur J Radiol 2021; 144:109994. [PMID: 34627106 DOI: 10.1016/j.ejrad.2021.109994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 09/18/2021] [Accepted: 09/29/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVES To assess the image quality of conventional respiratory-triggered 3-dimentional (3D) magnetic resonance cholangiopancreatography (Resp-MRCP) and breath-hold 3D MRCP (BH-MRCP) with and without denoising procedure using deep learning-based reconstruction (dDLR) at 1.5 T. METHODS Forty-two patients underwent MRCP at 1.5 T MRI. The following imaging sequences were performed: Resp-MRCP and BH-MRCP. We applied the dDLR method to the BH-MRCP data (BH-dDLR-MRCP). As a qualitative analysis, two radiologists rated the visibility of the proximal common bile duct (CBD), pancreaticobiliary junction, distal main pancreatic duct, cystic duct, and right and left hepatic ducts. Artifacts and overall image quality were also rated. The signal-to-noise ratios (SNRs), contrast ratios, and contrast-to-noise ratios (CNRs) of the CBD images were calculated for quantitative analysis. RESULTS BH-MRCP was successfully performed in a single BH. The qualitative and quantitative measurements for BH-dDLR-MRCP were significantly higher than for BH-MRCP (P < 0.02 and P < 0.001, respectively), and the qualitative measurements for BH-dDLR-MRCP were equivalent to or higher than for Resp-MRCP (P = 0.048-1.000). The SNRs and CNRs for BH-dDLR-MRCP were significantly higher than for Resp-MRCP (P < 0.001 and P = 0.001, respectively). CONCLUSION dDLR is useful and clinically feasible for BH-MRCP at 1.5 T MRI, and enables rapid imaging without loss of image quality compared to conventional Resp-MRCP.
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Affiliation(s)
- Taku Tajima
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo 108-8329, Japan; Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Haruto Sugawara
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Akira Kunimatsu
- Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo 108-8329, Japan
| | - Naoki Yoshioka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan
| | - Masaaki Akahane
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 kitakanamaru, Otawara, Tochigi 324-8501, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda Narita, Chiba 286-0124, Japan.
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24
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Shiba T, Sato M, Akisawa N, Sawaya Y, Murai H, Kiryu S, Otsuka M, Urano T. [A patient with mesenteric lymphoma who developed amyotrophic lateral sclerosis and sepsis]. Nihon Ronen Igakkai Zasshi 2021; 58:476-481. [PMID: 34483176 DOI: 10.3143/geriatrics.58.476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We treated a patient with mesenteric lymphoma who concomitantly developed amyotrophic lateral sclerosis (ALS). The patient died of urinary tract infection nine months after the onset of ALS. We herein report the changes in the patient's condition and the sequence of events until death from the viewpoint of a physiotherapist. The patient was a 69-year-old woman who developed mesenteric lymphoma in September of X year and perceived weakness in the toes in November of X year. She showed signs of upper and lower motor neuron disorders, and electrophysiologic testing revealed denervation in three areas of the spinal cord. In March of X+1 year, she was diagnosed with definite ALS based on the Awaji criteria. In April of X+1 year, she began to receive continuous home healthcare, specifically outpatient rehabilitation. No remarkable bulbar palsy was observed soon after the initiation of rehabilitation; however, manual muscle testing revealed strengths in the lower and upper limbs of 1 and 3-5, respectively, indicating muscle weakness and muscle atrophy. She developed exacerbation of neurological symptoms in the upper limbs, bulbar palsy, and respiratory muscle paralysis during rehabilitation. The ALS Functional Rating Scale-Revised indicated a decreased tendency to X [please define X]. In July of X+1 year, the mesenteric lymphoma had enlarged, resulting in the development of ureteric obstruction and ultimately causing hydronephrosis. Urinary tract infection and sepsis were diagnosed, and she was hospitalized. Although her fever temporarily subsided following ceftriaxone administration, she ultimately died due to a systemic inflammatory response syndrome three days after hospitalization. The mean period between the ALS onset and death is reportedly 40.6±33.1 months. The rate of ALS progression differs among individuals. Malignant tumors and paraneoplastic neurological syndrome may be involved in rapidly worsening neurological symptoms. Patients who concomitantly develop motor neuron disorders and malignant tumors are likely to have a higher risk of developing serious conditions associated with the exacerbation of neurological symptoms and complications. Our patient had several diseases that affected her survival prognosis; however, the sharing of information regarding her condition among healthcare professionals may have been insufficient. The primary physician responsible for treating each disease should cooperate with physiotherapists and other paramedical staff who have frequent opportunities to talk to patients in daily clinical practice. In geriatric patients in particular, such an environment is essential.
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Affiliation(s)
- Takahiro Shiba
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
| | - Miho Sato
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
| | - Naomi Akisawa
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en"
| | - Yohei Sawaya
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en".,Department of Physical Therapy, School of Health Science, International University of Health and Welfare
| | - Hiroyuki Murai
- Department of Neurology, School of Medicine, International University of Health and Welfare
| | - Shigeru Kiryu
- Department of Radiology, School of Medicine, International University of Health and Welfare
| | - Mieko Otsuka
- Department of Neurology, International University of Health and Welfare Hospital
| | - Tomohiko Urano
- Nishinasuno General Home Care Center, Department of Day Rehabilitation, Care Facility for the Elderly "Maronie-en".,Department of Geriatric Medicine, School of Medicine, International University of Health and Welfare
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Akai H, Miyagawa K, Takahashi K, Mochida-Saito A, Kurokawa K, Takeda H, Tsuji M, Sugawara H, Yasaka K, Kunimatsu A, Inoue Y, Abe O, Ohtomo K, Kiryu S. Effects of Gadolinium Deposition in the Brain on Motor or Behavioral Function: A Mouse Model. Radiology 2021; 301:409-416. [PMID: 34463554 DOI: 10.1148/radiol.2021210892] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Background Recent studies showing gadolinium deposition in multiple organs have raised concerns about the safety of gadolinium-based contrast agents (GBCAs). Purpose To explore whether gadolinium deposition in brain structures will cause any motor or behavioral alterations. Materials and Methods This study was performed from July 2019 to December 2020. Groups of 17 female BALB/c mice were each repeatedly injected with phosphate-buffered saline (control group, group A), a macrocyclic GBCA (group B), or a linear GBCA (group C) for 8 weeks (5 mmol per kilogram of bodyweight per week for GBCAs). Brain MRI studies were performed every other week to observe the signal intensity change caused by the gadolinium deposition. After the injection period, rotarod performance test, open field test, elevated plus-maze test, light-dark anxiety test, locomotor activity assessment test, passive avoidance memory test, Y-maze test, and forced swimming test were performed to assess the locomotor abilities, anxiety level, and memory. Among-group differences were compared by using one-way or two-way factorial analysis of variance with Tukey post hoc testing or Dunnett post hoc testing. Results Gadolinium deposition in the bilateral deep cerebellar nuclei was confirmed with MRI only in mice injected with a linear GBCA. At 8 weeks, contrast ratio of group C (0.11; 95% CI: 0.10, 0.12) was higher than that of group A (-2.1 × 10-3; 95% CI: -0.011, 7.5 × 10-3; P < .001) and group B (2.7 × 10-4; 95% CI: -8.2 × 10-3, 8.7 × 10-3; P < .001). Behavioral analyses showed that locomotor abilities, anxiety level, and long-term or short-term memory were not different in mice injected with linear or macrocyclic GBCAs. Conclusion No motor or behavioral alterations were observed in mice with brain gadolinium deposition. Also, the findings support the safety of macrocyclic gadolinium-based contrast agents. © RSNA, 2021 Online supplemental material is available for this article. See also the editorial by Chen in this issue.
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Affiliation(s)
- Hiroyuki Akai
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Kazuya Miyagawa
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Kohei Takahashi
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Atsumi Mochida-Saito
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Kazuhiro Kurokawa
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Hiroshi Takeda
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Minoru Tsuji
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Haruto Sugawara
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Koichiro Yasaka
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Akira Kunimatsu
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Yusuke Inoue
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Osamu Abe
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Kuni Ohtomo
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
| | - Shigeru Kiryu
- From the Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan (H.A., H.S., K.Y., A.K.); Department of Pharmacology, and School of Pharmacy (K.M., K.T., A.M.S., K.K., M.T.), and International University of Health and Welfare (K.O.), Ohtawara, Tochigi, Japan; Department of Pharmacology, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan (H.T.); Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan (Y.I.); Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan (O.A.); and Department of Radiology, International University of Health and Welfare, Narita, Chiba, Japan (S.K.)
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Takeshita Y, Terada J, Fujita R, Hirasawa Y, Kinoshita T, Isaka Y, Kinouchi T, Tajima H, Tada Y, Kiryu S, Tsushima K. Coronary artery calcium score may be a novel predictor of COVID-19 prognosis: a retrospective study. BMJ Open Respir Res 2021; 8:8/1/e000923. [PMID: 34272254 PMCID: PMC8288241 DOI: 10.1136/bmjresp-2021-000923] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 07/05/2021] [Indexed: 01/02/2023] Open
Abstract
Background Although several studies have reported an association between atherosclerosis-related diseases and COVID-19, the relationship between COVID-19 severity and atherosclerosis progression remains unclear. The aim of this study is to determine the coronary artery calcium score (CACS) prognostic value in patients with COVID-19 using indices such as deterioration in oxygenation and CT images of the chest. Methods This was a single-centre retrospective study of 53 consecutive patients with COVID-19 in Narita who were admitted to our hospital between March 2020 and August 2020. CACS was calculated based on non-gated CT scans of the chest performed on admission day. The patients were divided into the following two groups based on CACS: group 1 (CACS ≥180, n=11) and group 2 (CACS <180, n=42). Following univariate analysis of the main variables, multivariate analysis of variables that may be associated with COVID-19 progression was performed. Results Multivariable logistic regression analysis of age, sex, smoking history, diabetes, hypertension, dyslipidaemia, number of days from symptom onset to hospitalisation and CACS of ≥180 was performed. It revealed that unlike CACS of <180, CACS of ≥180 is associated with exacerbation of oxygenation or CT images of the chest during hospitalisation (OR: 12.879, 95% CI: 1.399 to 380.401). Furthermore, this model of eight variables showed good calibration (Hosmer-Lemeshow p=0.119). Conclusion CACS may be a prognosis marker of COVID-19 severity. Although coronary artery calcification is not typically assessed in pneumonia cases, it may provide a valuable clinical indicator for predicting severe COVID-19 outcomes.
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Affiliation(s)
- Yuichiro Takeshita
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Jiro Terada
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Retsu Fujita
- Innovation and Research Support Center, International University of Health and Welfare, Tokyo, Japan
| | - Yasutaka Hirasawa
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Taku Kinoshita
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Yuri Isaka
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Toru Kinouchi
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Hiroshi Tajima
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Yuji Tada
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, Narita, Japan
| | - Kenji Tsushima
- Department of Pulmonary Medicine, International University of Health and Welfare Narita Hospital, Narita, Japan
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Li D, Zhang J, Kiryu S, Zhang X, Wang F. Clinical and CT features of ovarian torsion in infants, children and adolescents. Int J Gynaecol Obstet 2021; 156:444-449. [PMID: 33621364 DOI: 10.1002/ijgo.13657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 02/17/2021] [Accepted: 02/22/2021] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To investigate the clinical features and computed tomography (CT) findings of pediatric ovarian torsion. METHODS A retrospective analysis of the clinical and CT data of 61 newborns, infants, children, and adolescents with ovarian torsion confirmed by histopathology was performed. RESULTS Clinical features included abdominal mass, abdominal pain, nausea and vomiting, and fever. The tumor marker α-fetoprotein was increased in five cases. Ovarian enlargement was found in 26 cases, and follicles were detected in the peripheral region of the ovary in 21 cases. Twenty-one cases presented as solid mixed-density masses on CT images. A total of 30 cases of ovarian torsion were associated with a benign ovarian mass. Among 27 cases of cystic or predominantly cystic masses, the mass had a thickened wall in 26 cases and showed an uneven density in 23 cases. Among all 61 patients, a torsed pedicle was detected in 47 cases. A torsed ovary or mass exhibited mild contrast enhancement in seven cases. Uterine deviation toward the involved side, blurred fat space around lesions, and pelvic free fluid were also found. CONCLUSION Pediatric ovarian torsion presents a relatively characteristic CT appearance. Correct diagnosis can be established based on clinical and imaging features.
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Affiliation(s)
- Dumin Li
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
| | - Jingwen Zhang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China.,Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Shigeru Kiryu
- Department of Radiology, Narita Hospital, International University of Health and Welfare, Narita, Japan
| | - Xiaoming Zhang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
| | - Fang Wang
- Department of Radiology, Qilu Hospital of Shandong University, Jinan, China
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Ohgami Y, Kotani Y, Yoshida N, Kunimatsu A, Kiryu S, Inoue Y. Voice, rhythm, and beep stimuli differently affect the right hemisphere preponderance and components of stimulus-preceding negativity. Biol Psychol 2021; 160:108048. [PMID: 33596460 DOI: 10.1016/j.biopsycho.2021.108048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 02/08/2021] [Accepted: 02/08/2021] [Indexed: 12/30/2022]
Abstract
The present study investigated whether auditory stimuli with different contents affect right laterality and the components of stimulus-preceding negativity (SPN). A time-estimation task was performed under voice, rhythm, beep, and control conditions. The SPN interval during which participants anticipated the stimulus was divided into quarters to define early and late SPNs. Early and late components of SPN were also extracted using a principal component analysis. The anticipation of voice sounds enhanced the early SPN and the early component, which reflected the anticipation of language processing. Beep sounds elicited the right hemisphere preponderance of the early component, the early SPN, and the late SPN. The rhythmic sound tended to attenuate the amplitude compared with the two other stimuli. These findings further substantiate the existence of separate early and late components of the SPN. In addition, they suggest that the early component reflects selective anticipatory attention toward differing types of auditory feedback.
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Affiliation(s)
- Yoshimi Ohgami
- Institute for Liberal Arts, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro, Tokyo, Japan.
| | - Yasunori Kotani
- Institute for Liberal Arts, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro, Tokyo, Japan
| | - Nobukiyo Yoshida
- Department of Radiology, Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato, Tokyo, Japan
| | - Akira Kunimatsu
- Department of Radiology, Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato, Tokyo, Japan
| | - Shigeru Kiryu
- Department of Medicine, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan
| | - Yusuke Inoue
- Department of Diagnostic Radiology, Kitasato University, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, Japan
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Ohta T, Shirakawa T, Okada S, Ishii N, Kiryu S. In vitro Demonstration of Melanoma Metastasis in Lymph Nodes of Prepared Specimens Using a Light-emitting Diode-based Multispectral Photoacoustic Ultrasound Imaging System. J Med Ultrasound 2020; 29:50-52. [PMID: 34084717 PMCID: PMC8081111 DOI: 10.4103/jmu.jmu_121_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/22/2020] [Accepted: 03/02/2020] [Indexed: 11/05/2022] Open
Abstract
Although an excellent photoacoustic (PA) ultrasound method has been reported for the evaluation of lymph node melanoma metastasis in animal experiments, it remains to be evaluated in clinical trials. Recently, we performed PA ultrasound assessment using light-emitting diodes to detect metastatic melanoma in the lymph nodes of specimens prepared for microscopic examination. The PA effect was not obvious in amelanotic melanoma, but was seen in melanotic melanoma by PA imaging (PAI) and histopathological correlation in cases of primary melanotic melanoma accompanied by metastatic lymph nodes, including the coexistence of amelanotic melanoma and melanotic melanoma. Clinical workup should be performed with not only PAI but also conventional ultrasonography in cases with metastasis related to amelanotic transformation, which would likely be missed by PAI alone.
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Affiliation(s)
- Tomoyuki Ohta
- Department of Radiology, International University of Health and Welfare Hospital, Otawara, Tochigi, Japan
| | - Takako Shirakawa
- Department of Radiological Science, Tokyo Metropolitan University Graduate School of Health Science, Tokyo, Japan
| | - Shinya Okada
- Department of Pathology, International University of Health and Welfare Hospital, Otawara, Tochigi, Japan
| | - Naohiro Ishii
- Department of Plastic Surgery, International University of Health and Welfare Hospital, Otawara, Tochigi, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Hospital, Otawara, Tochigi, Japan
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Yasaka K, Akai H, Kunimatsu A, Kiryu S, Abe O. Prediction of bone mineral density from computed tomography: application of deep learning with a convolutional neural network. Eur Radiol 2020; 30:3549-3557. [DOI: 10.1007/s00330-020-06677-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 01/01/2020] [Accepted: 01/27/2020] [Indexed: 02/07/2023]
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Akai H, Yasaka K, Kunimatsu A, Ohtomo K, Abe O, Kiryu S. Application of CT texture analysis to assess the localization of primary aldosteronism. Sci Rep 2020; 10:472. [PMID: 31949215 PMCID: PMC6965605 DOI: 10.1038/s41598-020-57427-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 12/30/2019] [Indexed: 11/10/2022] Open
Abstract
We performed present study to investigate whether the localization of primary aldosteronism (PA) can be predicted using quantitative texture analysis on unenhanced computed tomography (CT). Plain CT data of 82 PA patients (54 unilateral (right-sided:left-sided = 24:30), 28 bilateral) were analyzed retrospectively. After semi-automatically setting the region of interest to include the whole adrenal gland, texture analyses were performed with or without a Laplacian of Gaussian filter with various spatial scaling factors (SSFs). Logistic regression analysis was performed using the extracted histogram-based texture features to identify parameters capable of predicting excessive aldosterone production. The result of adrenal venous sampling served as gold standard in present study. As a result, logistic regression analysis indicated that the mean gray level intensity (p = 0.026), the mean value of the positive pixels (p = 0.003) in the unfiltered image, and entropy (p = 0.027) in the filtered image (SSF: 2 mm) were significant parameters. Using the model constructed by logistic regression analysis and the optimum cutoff value, the localization of PA (three multiple choices of left, right or bilateral) was determined with an accuracy of 67.1% (55/82). CT texture analysis may provide a potential avenue for less invasive prediction of the localization of PA.
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Affiliation(s)
- Hiroyuki Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Akira Kunimatsu
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 Kitakanemaru, Ohtawara City, Tochigi, 324-8501, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Hospital, 537-3 Iguchi, Nasushiobara, Tochigi, 329-2763, Japan.
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Nakamoto T, Takahashi W, Haga A, Takahashi S, Kiryu S, Nawa K, Ohta T, Ozaki S, Nozawa Y, Tanaka S, Mukasa A, Nakagawa K. Prediction of malignant glioma grades using contrast-enhanced T1-weighted and T2-weighted magnetic resonance images based on a radiomic analysis. Sci Rep 2019; 9:19411. [PMID: 31857632 PMCID: PMC6923390 DOI: 10.1038/s41598-019-55922-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 12/04/2019] [Indexed: 01/07/2023] Open
Abstract
We conducted a feasibility study to predict malignant glioma grades via radiomic analysis using contrast-enhanced T1-weighted magnetic resonance images (CE-T1WIs) and T2-weighted magnetic resonance images (T2WIs). We proposed a framework and applied it to CE-T1WIs and T2WIs (with tumor region data) acquired preoperatively from 157 patients with malignant glioma (grade III: 55, grade IV: 102) as the primary dataset and 67 patients with malignant glioma (grade III: 22, grade IV: 45) as the validation dataset. Radiomic features such as size/shape, intensity, histogram, and texture features were extracted from the tumor regions on the CE-T1WIs and T2WIs. The Wilcoxon-Mann-Whitney (WMW) test and least absolute shrinkage and selection operator logistic regression (LASSO-LR) were employed to select the radiomic features. Various machine learning (ML) algorithms were used to construct prediction models for the malignant glioma grades using the selected radiomic features. Leave-one-out cross-validation (LOOCV) was implemented to evaluate the performance of the prediction models in the primary dataset. The selected radiomic features for all folds in the LOOCV of the primary dataset were used to perform an independent validation. As evaluation indices, accuracies, sensitivities, specificities, and values for the area under receiver operating characteristic curve (or simply the area under the curve (AUC)) for all prediction models were calculated. The mean AUC value for all prediction models constructed by the ML algorithms in the LOOCV of the primary dataset was 0.902 ± 0.024 (95% CI (confidence interval), 0.873-0.932). In the independent validation, the mean AUC value for all prediction models was 0.747 ± 0.034 (95% CI, 0.705-0.790). The results of this study suggest that the malignant glioma grades could be sufficiently and easily predicted by preparing the CE-T1WIs, T2WIs, and tumor delineations for each patient. Our proposed framework may be an effective tool for preoperatively grading malignant gliomas.
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Affiliation(s)
- Takahiro Nakamoto
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
- Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan
| | - Wataru Takahashi
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
| | - Akihiro Haga
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
- Department of Medical Image Informatics, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima, 770-8503, Japan
| | - Satoshi Takahashi
- Department of Neurosurgery, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Hospital, 537-3 Iguchi, Nasushiobara, Tochigi, 329-2763, Japan
| | - Kanabu Nawa
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Takeshi Ohta
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Sho Ozaki
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Yuki Nozawa
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shota Tanaka
- Department of Neurosurgery, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Akitake Mukasa
- Department of Neurosurgery, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto, 860-8556, Japan
| | - Keiichi Nakagawa
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
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Yasaka K, Akai H, Kunimatsu A, Kiryu S, Abe O. Factors associated with the size of the adhesio interthalamica based on 3.0-T magnetic resonance images. Acta Radiol 2019; 60:113-119. [PMID: 29742919 DOI: 10.1177/0284185118774952] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND Adhesio interthalamica (AI) is a small structure connecting bilateral thalami. PURPOSE To evaluate the effects of patient age, sex, and lateral diameter of the third ventricle on the long diameter of the AI using multivariate analyses based on magnetic resonance (MR) images obtained with 3.0-T scanners. MATERIAL AND METHODS This clinical retrospective study included images of 153 patients who underwent MR examination using 3.0-T scanners. The long diameter of the AI and lateral diameter of the third ventricle were measured on images in the mid-sagittal plane and axial plane at the anterior commissure, respectively. Univariate and multivariate analyses were performed. RESULTS AI was observed in 138 patients (70 men, 68 women; mean age = 63.7 ± 13.7 years; mean AI size =5.34 ± 1.63 mm). By univariate analyses, patient age (r = -0.262, P = 0.002), sex ( P = 0.010), and lateral diameter of the third ventricle (r = -0.642, P < 0.001) were significantly associated with the long diameter of the AI. With multiple linear regression analyses with a stepwise selection of parameters, only the lateral diameter of the third ventricle (estimate = -0.432, P < 0.001) was significantly associated with the long diameter of the AI. The lateral diameter of the third ventricle was longer in patients without AI (15 patients) than in those with AI ( P = 0.006). CONCLUSION The lateral diameter of the third ventricle was a major factor negatively associated with the long diameter of the AI.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Akira Kunimatsu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Shigeru Kiryu
- Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, Tochigi, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Akai H, Yasaka K, Kunimatsu A, Nojima M, Kokudo T, Kokudo N, Hasegawa K, Abe O, Ohtomo K, Kiryu S. Predicting prognosis of resected hepatocellular carcinoma by radiomics analysis with random survival forest. Diagn Interv Imaging 2018; 99:643-651. [DOI: 10.1016/j.diii.2018.05.008] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 05/12/2018] [Accepted: 05/15/2018] [Indexed: 12/16/2022]
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Yasaka K, Akai H, Kunimatsu A, Abe O, Kiryu S. Deep learning for staging liver fibrosis on CT: a pilot study. Eur Radiol 2018; 28:4578-4585. [PMID: 29761358 DOI: 10.1007/s00330-018-5499-7] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 04/10/2018] [Accepted: 04/18/2018] [Indexed: 12/13/2022]
Abstract
OBJECTIVES To investigate whether liver fibrosis can be staged by deep learning techniques based on CT images. METHODS This clinical retrospective study, approved by our institutional review board, included 496 CT examinations of 286 patients who underwent dynamic contrast-enhanced CT for evaluations of the liver and for whom histopathological information regarding liver fibrosis stage was available. The 396 portal phase images with age and sex data of patients (F0/F1/F2/F3/F4 = 113/36/56/66/125) were used for training a deep convolutional neural network (DCNN); the data for the other 100 (F0/F1/F2/F3/F4 = 29/9/14/16/32) were utilised for testing the trained network, with the histopathological fibrosis stage used as reference. To improve robustness, additional images for training data were generated by rotating or parallel shifting the images, or adding Gaussian noise. Supervised training was used to minimise the difference between the liver fibrosis stage and the fibrosis score obtained from deep learning based on CT images (FDLCT score) output by the model. Testing data were input into the trained DCNNs to evaluate their performance. RESULTS The FDLCT scores showed a significant correlation with liver fibrosis stage (Spearman's correlation coefficient = 0.48, p < 0.001). The areas under the receiver operating characteristic curves (with 95% confidence intervals) for diagnosing significant fibrosis (≥ F2), advanced fibrosis (≥ F3) and cirrhosis (F4) by using FDLCT scores were 0.74 (0.64-0.85), 0.76 (0.66-0.85) and 0.73 (0.62-0.84), respectively. CONCLUSIONS Liver fibrosis can be staged by using a deep learning model based on CT images, with moderate performance. KEY POINTS • Liver fibrosis can be staged by a deep learning model based on magnified CT images including the liver surface, with moderate performance. • Scores from a trained deep learning model showed moderate correlation with histopathological liver fibrosis staging. • Further improvement are necessary before utilisation in clinical settings.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Akira Kunimatsu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 537-3 Iguchi, Nasushiobara, Tochigi, 329-2763, Japan.
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Yasaka K, Akai H, Kunimatsu A, Kiryu S, Abe O. Deep learning with convolutional neural network in radiology. Jpn J Radiol 2018; 36:257-272. [PMID: 29498017 DOI: 10.1007/s11604-018-0726-3] [Citation(s) in RCA: 170] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 02/26/2018] [Indexed: 12/28/2022]
Abstract
Deep learning with a convolutional neural network (CNN) is gaining attention recently for its high performance in image recognition. Images themselves can be utilized in a learning process with this technique, and feature extraction in advance of the learning process is not required. Important features can be automatically learned. Thanks to the development of hardware and software in addition to techniques regarding deep learning, application of this technique to radiological images for predicting clinically useful information, such as the detection and the evaluation of lesions, etc., are beginning to be investigated. This article illustrates basic technical knowledge regarding deep learning with CNNs along the actual course (collecting data, implementing CNNs, and training and testing phases). Pitfalls regarding this technique and how to manage them are also illustrated. We also described some advanced topics of deep learning, results of recent clinical studies, and the future directions of clinical application of deep learning techniques.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan.
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Akira Kunimatsu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Shigeru Kiryu
- Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
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Yasaka K, Akai H, Abe O, Ohtomo K, Kiryu S. Quantitative computed tomography texture analyses for anterior mediastinal masses: Differentiation between solid masses and cysts. Eur J Radiol 2018; 100:85-91. [PMID: 29496084 DOI: 10.1016/j.ejrad.2018.01.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/22/2017] [Accepted: 01/15/2018] [Indexed: 10/18/2022]
Abstract
OBJECTIVES To investigate whether solid anterior mediastinal masses could be differentiated from cysts using quantitative computed tomography (CT) texture analyses in unenhanced CT (UECT) or contrast enhanced CT (CECT). MATERIALS AND METHODS This clinical retrospective study included 76 UECT images (40 men and 36 women, 28 cystic (mean diameter, 29.5 mm) and 48 solid (mean diameter, 48.2 mm)) and 84 CECT images (45 men and 39 women, 26 cystic (mean diameter, 31.4 mm) and 58 solid (mean diameter, 51.4 mm)) of anterior mediastinal masses, which were diagnosed histopathologically or using imaging criteria. Polygonal regions of interest were placed on these masses. CT histogram analyses for images of masses with or without filtration (Laplacian of Gaussian filters with various spatial scaling factors) were performed. DeLong's test was performed to compare areas under the curve (AUC) with receiver operating characteristic analyses. RESULTS From logistic regression analyses with a stepwise procedure, a combination of the mean in unfiltered images (mean0; i.e., CT attenuation) and mean in filtered images featuring coarse texture for UECT (AUC = 0.869) and the combination of mean0 and entropy in filtered images featuring fine texture for CECT (AUC = 0.997) were found to predict better the internal characteristics of anterior mediastinal masses. In UECT and CECT, diagnostic performance using these combinations tended to be high compared to mean0 alone (AUC = 0.780 [p = 0.033] and AUC = 0.983 [p = 0.130], respectively). CONCLUSION Solid anterior mediastinal masses can be differentiated from cysts using quantitative CT texture analyses with moderate and high diagnostic performance in UECT and CECT, respectively.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Kuni Ohtomo
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan; Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 537-3 Iguchi, Nasushiobara, Tochigi, 329-2763, Japan.
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Yasaka K, Akai H, Kunimatsu A, Abe O, Kiryu S. Liver Fibrosis: Deep Convolutional Neural Network for Staging by Using Gadoxetic Acid-enhanced Hepatobiliary Phase MR Images. Radiology 2017; 287:146-155. [PMID: 29239710 DOI: 10.1148/radiol.2017171928] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Purpose To investigate the performance of a deep convolutional neural network (DCNN) model in the staging of liver fibrosis using gadoxetic acid-enhanced hepatobiliary phase magnetic resonance (MR) imaging. Materials and Methods This retrospective study included patients for whom input data (hepatobiliary phase MR images, static magnetic field of the imaging unit, and hepatitis B and C virus testing results available, either positive or negative) and reference standard data (liver fibrosis stage evaluated from biopsy or surgical specimens obtained within 6 months of the MR examinations) were available were assigned to the training (534 patients) or the test (100 patients) group. For the training group (54, 53, 81, 113, and 233 patients with fibrosis stages F0, F1, F2, F3, and F4, respectively; mean patient age, 67.4 ± 9.7 years; 388 men and 146 women), MR images with three different section levels were augmented 90-fold (rotated, parallel-shifted, brightness-changed and contrast-changed images were generated; a total of 144 180 images). Supervised training was performed by using the DCNN model to minimize the difference between the output data (fibrosis score obtained through deep learning [FDL score]) and liver fibrosis stage. The performance of the DCNN model was evaluated in the test group (10, 10, 15, 20, and 45 patients with fibrosis stages F0, F1, F2, F3, and F4, respectively; mean patient age, 66.8 years ± 10.7; 71 male patients and 29 female patients) with receiver operating characteristic (ROC) analyses. Results The FDL score was correlated significantly with fibrosis stage (Spearman rank correlation coefficient: 0.63; P < .001). Fibrosis stages F4, F3, and F2 were diagnosed with areas under the ROC curve of 0.84, 0.84, and 0.85, respectively. Conclusion The DCNN model exhibited a high diagnostic performance in the staging of liver fibrosis. © RSNA, 2017 Online supplemental material is available for this article.
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Affiliation(s)
- Koichiro Yasaka
- From the Department of Radiology, the Institute of Medical Science, the University of Tokyo (K.Y., H.A., A.K.); Department of Radiology, Graduate School of Medicine, the University of Tokyo (O.A.); and Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan 286-8686 (S.K.)
| | - Hiroyuki Akai
- From the Department of Radiology, the Institute of Medical Science, the University of Tokyo (K.Y., H.A., A.K.); Department of Radiology, Graduate School of Medicine, the University of Tokyo (O.A.); and Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan 286-8686 (S.K.)
| | - Akira Kunimatsu
- From the Department of Radiology, the Institute of Medical Science, the University of Tokyo (K.Y., H.A., A.K.); Department of Radiology, Graduate School of Medicine, the University of Tokyo (O.A.); and Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan 286-8686 (S.K.)
| | - Osamu Abe
- From the Department of Radiology, the Institute of Medical Science, the University of Tokyo (K.Y., H.A., A.K.); Department of Radiology, Graduate School of Medicine, the University of Tokyo (O.A.); and Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan 286-8686 (S.K.)
| | - Shigeru Kiryu
- From the Department of Radiology, the Institute of Medical Science, the University of Tokyo (K.Y., H.A., A.K.); Department of Radiology, Graduate School of Medicine, the University of Tokyo (O.A.); and Department of Radiology, Graduate School of Medical Sciences, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, Japan 286-8686 (S.K.)
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Yasaka K, Akai H, Abe O, Kiryu S. Deep Learning with Convolutional Neural Network for Differentiation of Liver Masses at Dynamic Contrast-enhanced CT: A Preliminary Study. Radiology 2017; 286:887-896. [PMID: 29059036 DOI: 10.1148/radiol.2017170706] [Citation(s) in RCA: 318] [Impact Index Per Article: 45.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Purpose To investigate diagnostic performance by using a deep learning method with a convolutional neural network (CNN) for the differentiation of liver masses at dynamic contrast agent-enhanced computed tomography (CT). Materials and Methods This clinical retrospective study used CT image sets of liver masses over three phases (noncontrast-agent enhanced, arterial, and delayed). Masses were diagnosed according to five categories (category A, classic hepatocellular carcinomas [HCCs]; category B, malignant liver tumors other than classic and early HCCs; category C, indeterminate masses or mass-like lesions [including early HCCs and dysplastic nodules] and rare benign liver masses other than hemangiomas and cysts; category D, hemangiomas; and category E, cysts). Supervised training was performed by using 55 536 image sets obtained in 2013 (from 460 patients, 1068 sets were obtained and they were augmented by a factor of 52 [rotated, parallel-shifted, strongly enlarged, and noise-added images were generated from the original images]). The CNN was composed of six convolutional, three maximum pooling, and three fully connected layers. The CNN was tested with 100 liver mass image sets obtained in 2016 (74 men and 26 women; mean age, 66.4 years ± 10.6 [standard deviation]; mean mass size, 26.9 mm ± 25.9; 21, nine, 35, 20, and 15 liver masses for categories A, B, C, D, and E, respectively). Training and testing were performed five times. Accuracy for categorizing liver masses with CNN model and the area under receiver operating characteristic curve for differentiating categories A-B versus categories C-E were calculated. Results Median accuracy of differential diagnosis of liver masses for test data were 0.84. Median area under the receiver operating characteristic curve for differentiating categories A-B from C-E was 0.92. Conclusion Deep learning with CNN showed high diagnostic performance in differentiation of liver masses at dynamic CT. © RSNA, 2017 Online supplemental material is available for this article.
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Affiliation(s)
- Koichiro Yasaka
- From the Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan 113-8655
| | - Hiroyuki Akai
- From the Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan 113-8655
| | - Osamu Abe
- From the Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan 113-8655
| | - Shigeru Kiryu
- From the Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan 113-8655
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Kiryu S, Akai H, Nojima M, Hasegawa K, Shinkawa H, Kokudo N, Yasaka K, Ohtomo K. Impact of hepatocellular carcinoma heterogeneity on computed tomography as a prognostic indicator. Sci Rep 2017; 7:12689. [PMID: 28978930 PMCID: PMC5627280 DOI: 10.1038/s41598-017-12688-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 09/13/2017] [Indexed: 12/12/2022] Open
Abstract
We assessed the relationship between the heterogeneity of HCC on preoperative non-contrast-enhanced CT and patient prognosis. The heterogeneity of CT images from 122 patients was assessed and texture feature parameters such as mean, standard deviation (SD), entropy, mean of the positive pixels (MPP), skewness, and kurtosis were obtained using filtration. The relationship between CT texture features and 5-year overall survival (OS) or disease-free survival (DFS) was assessed. Multivariate regression analysis was performed to evaluate the independence of texture feature from clinical or pathological parameters. The Kaplan-Meier curves for OS or DFS was significantly different between patient groups dichotomized by cut-off values for all CT texture parameters with filtration at at least one filter level. Multivariate regression analysis showed the independence of most CT texture parameters on clinical and pathological parameters for OS with filtration at at least one filter level and without filtration except kurtosis. SD, entropy, and MPP with coarse filter, and skewness without filtration showed a significant correlation for DFS. CT texture features of non-contrast-enhanced CT images showed a relationship with HCC prognosis. Multivariate regression analysis showed the possibility of CT texture feature increase the prognostic prediction of HCC by clinical and pathological information.
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Affiliation(s)
- Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Hospital, Nasushiobara, Tochigi, Japan.
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Masanori Nojima
- Division of Advanced Medicine Promotion, The Advanced Clinical Research Center, The Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Kiyoshi Hasegawa
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Hiroji Shinkawa
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Norihiro Kokudo
- Division of Hepato-Biliary-Pancreatic Surgery, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, Otawara, Tochigi, Japan
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Akai H, Yasaka K, Nojima M, Kunimatsu A, Inoue Y, Abe O, Ohtomo K, Kiryu S. Gadoxetate disodium-induced tachypnoea and the effect of dilution method: a proof-of-concept study in mice. Eur Radiol 2017; 28:692-697. [PMID: 28894937 DOI: 10.1007/s00330-017-5037-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 08/06/2017] [Accepted: 08/16/2017] [Indexed: 12/11/2022]
Abstract
OBJECTIVES To directly investigate the rapid respiratory effect of gadoxetate disodium in an experimental study using mice. METHODS After confirming the steady respiratory state under general anaesthesia, eight mice were injected with all test agents in the following order: phosphate-buffered saline (A, control group), 1.25 mmol/kg of gadoteridol (B) or gadopentetate dimeglumine (C), or 0.31 mmol/kg of gadoxetate disodium (D, E). The experimenter was not blinded to the agents. The injection dose was fixed as 100 μL for Groups A-D and 50 μL for Group E. We continuously monitored and recorded respiratory rate (RR), peripheral oxygen saturation (SpO2), and heart rate. The time-series changes from 0 to 30 s were compared by the linear mixed method RESULTS: Groups D and E showed the largest RR increase (20.6 and 20.3 breaths/min, respectively) and were significantly larger compared to Group A (3.36 breaths/min, both P<0.001). RR change of Groups D and E did not differ. RR change of Groups B and C was smaller (0.72 and 12.4 breaths/min, respectively) and did not differ statistically with Group A. Significant bradycardia was observed only in Group C (P<0.001). SpO2 was constant in all groups. CONCLUSIONS Gadoxetate disodium causes a rapid tachypnoea without significant change of SpO2 and heart rate regardless of the dilution method. KEY POINTS • Injection of gadoxetate disodium causes tachypnoea. • Dilution method did not alter the rapid respiratory effect of gadoxetate disodium. • The respiratory effect of gadoxetate disodium was larger than other contrast agents.
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Affiliation(s)
- Hiroyuki Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Masanori Nojima
- Division of Advanced Medicine Promotion, The Advanced Clinical Research Centre, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Akira Kunimatsu
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Yusuke Inoue
- Department of Diagnostic Radiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, 252-0374, Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Kuni Ohtomo
- International University of Health and Welfare, 2600-1 Kitakanemaru, Ohtawara, Tochigi, 324-8501, Japan
| | - Shigeru Kiryu
- Department of Radiology, International University of Health and Welfare Hospital, 537-3, Iguchi, Nasushiobara, Tochigi, 329-2763, Japan.
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Numata T, Kiryu S, Maeda T, Egusa C, Tsuboi R, Harada K. A pulmonary metastatic model of murine melanoma assessed by magnetic resonance imaging. Exp Dermatol 2017; 26:619-621. [PMID: 28266733 DOI: 10.1111/exd.13327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/21/2017] [Indexed: 11/29/2022]
Abstract
Immune checkpoint inhibitors and kinase inhibitors have improved prognosis of malignant melanoma (MM) patients. However, these therapies cannot completely overcome the metastasis of MM. Thus, development of new therapy against metastasis should be required. A first step towards this goal, the aim of this study, is to establish a model of pulmonary metastasis from primary cutaneous MM and a monitoring system. B16-F10, a murine melanoma cell line, was subcutaneously injected into the pinna of mice. The pinna was excised when the lesion was detected. A metastatic nodule on T2-weighted imaging was detected 4 weeks after resection of the pinna. Lung metastases were observed in 37.5% (6/16) of the specimens. We established a novel murine model of the high pulmonary metastasis of MM. The MRI was useful for observations of the growth of the metastatic lesions in the lungs without dissection.
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Affiliation(s)
- Takafumi Numata
- Department of Dermatology, Tokyo Medical University, Tokyo, Japan
| | - Shigeru Kiryu
- Department of Radiology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Tatsuo Maeda
- Department of Dermatology, Tokyo Medical University, Tokyo, Japan
| | - Chizu Egusa
- Department of Dermatology, Tokyo Medical University, Tokyo, Japan
| | - Ryoji Tsuboi
- Department of Dermatology, Tokyo Medical University, Tokyo, Japan
| | - Kazutoshi Harada
- Department of Dermatology, Tokyo Medical University, Tokyo, Japan
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Yasaka K, Akai H, Mackin D, Court L, Moros E, Ohtomo K, Kiryu S. Precision of quantitative computed tomography texture analysis using image filtering: A phantom study for scanner variability. Medicine (Baltimore) 2017; 96:e6993. [PMID: 28538408 PMCID: PMC5457888 DOI: 10.1097/md.0000000000006993] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Quantitative computed tomography (CT) texture analyses for images with and without filtration are gaining attention to capture the heterogeneity of tumors. The aim of this study was to investigate how quantitative texture parameters using image filtering vary among different computed tomography (CT) scanners using a phantom developed for radiomics studies.A phantom, consisting of 10 different cartridges with various textures, was scanned under 6 different scanning protocols using four CT scanners from four different vendors. CT texture analyses were performed for both unfiltered images and filtered images (using a Laplacian of Gaussian spatial band-pass filter) featuring fine, medium, and coarse textures. Forty-five regions of interest were placed for each cartridge (x) in a specific scan image set (y), and the average of the texture values (T(x,y)) was calculated. The interquartile range (IQR) of T(x,y) among the 6 scans was calculated for a specific cartridge (IQR(x)), while the IQR of T(x,y) among the 10 cartridges was calculated for a specific scan (IQR(y)), and the median IQR(y) was then calculated for the 6 scans (as the control IQR, IQRc). The median of their quotient (IQR(x)/IQRc) among the 10 cartridges was defined as the variability index (VI).The VI was relatively small for the mean in unfiltered images (0.011) and for standard deviation (0.020-0.044) and entropy (0.040-0.044) in filtered images. Skewness and kurtosis in filtered images featuring medium and coarse textures were relatively variable across different CT scanners, with VIs of 0.638-0.692 and 0.430-0.437, respectively.Various quantitative CT texture parameters are robust and variable among different scanners, and the behavior of these parameters should be taken into consideration.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Dennis Mackin
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Laurence Court
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Eduardo Moros
- Departments of Radiation Oncology, Diagnostic Imaging, and Cancer Imaging and Metabolism, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL
| | - Kuni Ohtomo
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shigeru Kiryu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
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Wang F, Kiryu S, Li L, Wang Q, Li D, Zhang L. Resectable primary pleural myxoid liposarcoma with a pedicle: report of a rare case and literature review. J Thorac Dis 2017; 9:E183-E187. [PMID: 28449500 DOI: 10.21037/jtd.2017.03.29] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Primary pleural myxoid liposarcoma is a rare tumor. Here, we report a primary myxoid liposarcoma occupying the majority of the left thoracic cavity with features suggesting invasion. Computed tomography (CT) at medical check-up incidentally revealed a bulky inhomogeneous fatty mass. The tumor's large size made a prediction of its resectability by preoperative CT difficult. The patient underwent an operation, which revealed that the tumor was attached to the pleura with a thin pedicle; the tumor was resected completely. Few therapies for pleural liposarcoma other than resection are available; hence, surgery should be considered even if the tumor's size implies invasion on radiological imaging. In this case report, we discuss the imaging findings of this case with a review of the related literature.
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Affiliation(s)
- Fang Wang
- Department of Radiology, Qi Lu Hospital of Shandong University, Jinan 250012, China
| | - Shigeru Kiryu
- Department of Radiology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Li Li
- Department of Pathology, Qi Lu Hospital of Shandong University, Jinan 250012, China
| | - Qing Wang
- Department of Radiology, Qi Lu Hospital of Shandong University, Jinan 250012, China
| | - Dumin Li
- Department of Radiology, Qi Lu Hospital of Shandong University, Jinan 250012, China
| | - Lifeng Zhang
- Department of Radiology, People's Hospital of Taierzhuang District, Taierzhuang 277400, China
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Yasaka K, Akai H, Nojima M, Shinozaki-Ushiku A, Fukayama M, Nakajima J, Ohtomo K, Kiryu S. Quantitative computed tomography texture analysis for estimating histological subtypes of thymic epithelial tumors. Eur J Radiol 2017. [PMID: 28624025 DOI: 10.1016/j.ejrad.2017.04.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVES To investigate whether high-risk thymic epithelial tumor (TET) (HTET) can be differentiated from low-risk TET (LTET) using computed tomography (CT) quantitative texture analysis. MATERIALS AND METHODS The data of 39 patients (mean age, 58.6±14.1 years) (39 unenhanced CT (UECT) and 33 contrast-enhanced CT (CECT)) who underwent thymectomy for TET were retrospectively analyzed. A region of interest was placed to include the entire TET within the slice at its maximum diameter. Texture analysis was performed for images with or without a Laplacian of Gaussian filter (with various spatial scaling factors [SSFs]). Two radiologists evaluated the visual heterogeneity of TET using a 3-point scale. RESULTS The mean in the unfiltered image (mean0u) and entropy in the filtered image (SSF: 6mm) (entropy6u) for UECT, and the mean in the unfiltered image (mean0c) for CECT were significant parameters for differentiating between HTET and LTET as determined by logistic regression analysis. The area under the receiver operating characteristics curve (AUC) for differentiating HTET from LTET using mean0u, entropy6u, and mean0c was 0.75, 0.76, and 0.89, respectively. And the combination of mean0u and entropy6u allowed AUC of 0.87. Entropy6u provided a higher diagnostic performance compared with visual heterogeneity analysis (p≤0.018). CONCLUSION Using CT quantitative texture analysis, HTET can be differentiated from LTET with a high diagnostic performance.
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Affiliation(s)
- Koichiro Yasaka
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Hiroyuki Akai
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Masanori Nojima
- Center for Translational Research, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Aya Shinozaki-Ushiku
- Department of Pathology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Masashi Fukayama
- Department of Pathology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Jun Nakajima
- Department of Thoracic Surgery, Graduate School of Medicine, The University of Tokyok, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Kuni Ohtomo
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Shigeru Kiryu
- Department of Radiology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
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Akai H, Shiraishi K, Yokoyama M, Yasaka K, Nojima M, Inoue Y, Abe O, Ohtomo K, Kiryu S. PEG-poly(L-lysine)-based polymeric micelle MRI contrast agent: Feasibility study of a Gd-micelle contrast agent for MR lymphography. J Magn Reson Imaging 2017; 47:238-245. [DOI: 10.1002/jmri.25740] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 04/04/2017] [Indexed: 01/20/2023] Open
Affiliation(s)
- Hiroyuki Akai
- Department of Radiology; Institute of Medical Science, University of Tokyo; Tokyo Japan
| | - Kouichi Shiraishi
- Medical Engineering Laboratory; Research Center for Medical Science, Jikei University School of Medicine; Tokyo Japan
| | - Masayuki Yokoyama
- Medical Engineering Laboratory; Research Center for Medical Science, Jikei University School of Medicine; Tokyo Japan
| | - Koichiro Yasaka
- Department of Radiology; Institute of Medical Science, University of Tokyo; Tokyo Japan
| | - Masanori Nojima
- Division of Advanced Medicine Promotion; Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo; Tokyo Japan
| | - Yusuke Inoue
- Department of Diagnostic Radiology; Kitasato University School of Medicine; Kanagawa Japan
| | - Osamu Abe
- Department of Radiology; Graduate School of Medicine, University of Tokyo; Tokyo Japan
| | - Kuni Ohtomo
- International University of Health and Welfare; Tochigi Japan
| | - Shigeru Kiryu
- Department of Radiology; Institute of Medical Science, University of Tokyo; Tokyo Japan
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Akai H, Kiryu S, Shinozaki M, Ohta Y, Nakano Y, Yasaka K, Ohtomo K. Computed tomography and magnetic resonance imaging of a plexiform angiomyxoid myofibroblastic tumor: a case report. BMC Med Imaging 2017; 17:7. [PMID: 28103839 PMCID: PMC5244533 DOI: 10.1186/s12880-017-0180-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 01/12/2017] [Indexed: 02/08/2023] Open
Abstract
Background Plexiform angiomyxoid myofibroblastic tumor (PAMT) is a very rare mesenchymal tumor of the stomach. Here we report a case of pathologically confirmed PAMT with an unique cyst formation. Case presentation A 55-year-old male with a 10-year history of a gastric subepithelial tumor underwent computed tomography (CT) and magnetic resonance imaging (MRI). Two cysts were observed in the tumor, and the cyst wall showed moderately high intensity on T2-weighted images compared with the gastric wall. On dynamic study, the cyst wall showed a gradual enhancement pattern, and prominent enhancement was observed in the delayed phase. Laparoscopic partial gastric resection was performed, and a pathological diagnosis of PAMT was rendered. Conclusion We present a rare case of gastric PAMT, which was uniquely presented as cysts. One of the cysts in the tumor had an epithelial wall lining, which had never been reported before in gastric mesenchymal tumor, in addition to partial glandular structure. We reviewed our case, focusing on radiologic-pathologic correlation, and suggested hypothesis of cyst formation. According to our findings, PAMT with cyst formation would be included of differential diagnosis of gastric subepithelial tumors.
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Affiliation(s)
- Hiroyuki Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan.
| | - Shigeru Kiryu
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Masaru Shinozaki
- Department of Surgery, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Yasunori Ohta
- Department of Pathology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Yoshiyasu Nakano
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Kuni Ohtomo
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
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Akai H, Kiryu S, Ohta Y, Yasaka K, Nakano Y, Inoue Y, Ohtomo K. The natural history of streptozotocin-stimulated non-alcoholic steatohepatitis mice followed by Gd-EOB-DTPA-enhanced MRI: Comparison with simple steatosis mice. Magn Reson Imaging 2017; 38:123-128. [PMID: 28062263 DOI: 10.1016/j.mri.2016.12.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 12/29/2016] [Accepted: 12/30/2016] [Indexed: 12/19/2022]
Abstract
PURPOSE To clarify the development of HCC, temporal change of steatosis and Gd-EOB-DTPA enhancement of non-alcoholic steatohepatitis (NASH) model mice by magnetic resonance imaging (MRI). MATERIALS AND METHODS All animal experiments were approved by the institution's Animal Research Committee. MRI was performed on six NASH and six simple steatosis (SS) model mice every 2weeks from the ages of 8weeks to 16weeks. The sequential changes in the number and size of the focal liver lesions detected on Gd-EOB-DTPA-enhanced MRI were evaluated. Additionally, the hepatic fat fraction (HFF), contrast-to-noise ratio (CNR) and relative enhancement (RE) were calculated at each time point. The temporal changes and correlations in these parameters were evaluated. RESULTS All alive NASH model mice demonstrated focal liver lesions from week 10, at the latest. Number of the lesions increased with time, and all the lesion enlarged with time. All the lesions larger than 1mm were confirmed as hepatocellular carcinoma (HCC) pathologically. While the HFF remained constant in NASH model mice, HFF in SS model mice dramatically increased with time. CNR of the NASH model mice remained constant through the study period, while CNR in SS model mice decreased with time. Although no correlation was seen in NASH model mice, the HFF showed a negative correlation against CNR and RE in SS model mice. CONCLUSION Development of HCC was observed using Gd-EOB-DTPA-enhanced MRI only in NASH model mice. Degree of steatosis and hepatic enhancement by Gd-EOB-DTPA was both constant in NASH model mice, while steatosis increased and hepatic enhancement decreased with time in SS model mice.
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Affiliation(s)
- Hiroyuki Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Shigeru Kiryu
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
| | - Yasunori Ohta
- Department of Pathology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Koichiro Yasaka
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Yoshiyasu Nakano
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Yusuke Inoue
- Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Kuni Ohtomo
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
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Kotani Y, Ohgami Y, Yoshida N, Kiryu S, Inoue Y. Anticipation process of the human brain measured by stimulus-preceding negativity (SPN). ACTA ACUST UNITED AC 2017. [DOI: 10.7600/jpfsm.6.7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
| | - Yoshimi Ohgami
- Institute for Liberal Arts, Tokyo Institute of Technology
| | - Nobukiyo Yoshida
- Department of Radiology, Institute of Medical Science, University of Tokyo
| | - Shigeru Kiryu
- Department of Radiology, Institute of Medical Science, University of Tokyo
| | - Yusuke Inoue
- Department of Diagnostic Radiology, Kitasato University School of Medicine
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Yoshikawa N, Shimizu N, Uehara M, Oda A, Matsumiya R, Matsubara E, Kobayashi H, Hosono O, Kuribara-Souta A, Baba H, Nagamura F, Kiryu S, Tanaka H. The effects of bolus supplementation of branched-chain amino acids on skeletal muscle mass, strength, and function in patients with rheumatic disorders during glucocorticoid treatment. Mod Rheumatol 2016; 27:508-517. [PMID: 27678151 DOI: 10.1080/14397595.2016.1213480] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVES To test the effects of bolus supplementation of branched-chain amino acids (BCAA) on skeletal muscle mass, strength, and function in patients with rheumatic disorders taking glucocorticoid (GC). METHODS Patients with rheumatic disorders treated with prednisolone (≥10 mg/day) were randomized to ingest additional daily 12 g of BCAA (n = 9) or not (n = 9) for 12 weeks. At baseline, and 4, 8, and 12 weeks, they underwent bioelectrical impedance analysis, muscle strength and functional tests, and computed tomography analysis for cross-sectional area of mid-thigh muscle. RESULTS Disease activities of the patients were well controlled and daily GC dose was similarly reduced in both groups. Limb muscle mass was recovered in both groups. Whole-body muscle mass and muscle strength and functional mobility were increased only in BCAA (+) group. The effects of BCAA supplementation on recovering skeletal muscle mass were prominent in particular muscles including biceps femoris muscle. CONCLUSIONS This trial is the first-in-man clinical trial to demonstrate that BCAA supplementation might be safe and, at least in part, improve skeletal muscle mass, strength, and function in patients with rheumatic disorders treated with GC.
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Affiliation(s)
| | - Noriaki Shimizu
- a Department of Rheumatology and Allergy.,b Division of Rheumatology, Center for Antibody and Vaccine Therapy
| | | | - Aya Oda
- a Department of Rheumatology and Allergy
| | | | | | | | | | | | | | | | - Shigeru Kiryu
- d Department of Radiology , IMSUT Hospital, Institute of Medical Science, the University of Tokyo , Shirokanedai , Minato-ku , Tokyo , Japan
| | - Hirotoshi Tanaka
- a Department of Rheumatology and Allergy.,b Division of Rheumatology, Center for Antibody and Vaccine Therapy
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