1
|
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.
Collapse
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.
| |
Collapse
|
2
|
Yasaka K, Sato C, Hirakawa H, Fujita N, Kurokawa M, Watanabe Y, Kubo T, Abe O. Impact of deep learning on radiologists and radiology residents in detecting breast cancer on CT: a cross-vendor test study. Clin Radiol 2024; 79:e41-e47. [PMID: 37872026 DOI: 10.1016/j.crad.2023.09.022] [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: 07/21/2023] [Revised: 09/13/2023] [Accepted: 09/29/2023] [Indexed: 10/25/2023]
Abstract
AIM To investigate the effect of deep learning on the diagnostic performance of radiologists and radiology residents in detecting breast cancers on computed tomography (CT). MATERIALS AND METHODS In this retrospective study, patients undergoing contrast-enhanced chest CT between January 2010 and December 2020 using equipment from two vendors were included. Patients with confirmed breast cancer were categorised as the training (n=201) and validation (n=26) group and the testing group (n=30) using processed CT images from either vendor. The trained deep-learning model was applied to test group patients with (30 females; mean age = 59.2 ± 15.8 years) and without (19 males, 21 females; mean age = 64 ± 15.9 years) breast cancer. Image-based diagnostic performance of the deep-learning model was evaluated with the area under the receiver operating characteristic curve (AUC). Two radiologists and three radiology residents were asked to detect malignant lesions by recording a four-point diagnostic confidence score before and after referring to the result from the deep-learning model, and their diagnostic performance was evaluated using jackknife alternative free-response receiver operating characteristic analysis by calculating the figure of merit (FOM). RESULTS The AUCs of the trained deep-learning model on the validation and test data were 0.976 and 0.967, respectively. After referencing with the result of the deep learning model, the FOMs of readers significantly improved (reader 1/2/3/4/5: from 0.933/0.962/0.883/0.944/0.867 to 0.958/0.968/0.917/0.947/0.900; p=0.038). CONCLUSION Deep learning can help radiologists and radiology residents detect breast cancer on CT.
Collapse
Affiliation(s)
- K Yasaka
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
| | - C Sato
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - H Hirakawa
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - N Fujita
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - M Kurokawa
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Y Watanabe
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - T Kubo
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - O Abe
- Department of Radiology, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| |
Collapse
|
3
|
Fujita S, Yokoyama K, Hagiwara A, Kato S, Andica C, Kamagata K, Hattori N, Abe O, Aoki S. 3D Quantitative Synthetic MRI in the Evaluation of Multiple Sclerosis Lesions. AJNR Am J Neuroradiol 2021; 42:471-478. [PMID: 33414234 DOI: 10.3174/ajnr.a6930] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 09/30/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND PURPOSE Synthetic MR imaging creates multiple contrast-weighted images based on a single time-efficient quantitative scan, which has been mostly performed for 2D acquisition. We assessed the utility of 3D synthetic MR imaging in patients with MS by comparing its diagnostic image quality and lesion volumetry with conventional MR imaging. MATERIALS AND METHODS Twenty-four patients with MS prospectively underwent 3D quantitative synthetic MR imaging and conventional T1-weighted, T2-weighted, FLAIR, and double inversion recovery imaging, with acquisition times of 9 minutes 3 seconds and 18 minutes 27 seconds for the synthetic MR imaging and conventional MR imaging sequences, respectively. Synthetic phase-sensitive inversion recovery images and those corresponding to conventional MR imaging contrasts were created for synthetic MR imaging. Two neuroradiologists independently assessed the image quality on a 5-point Likert scale. The numbers of cortical lesions and lesion volumes were quantified using both synthetic and conventional image sets. RESULTS The overall diagnostic image quality of synthetic T1WI and double inversion recovery images was noninferior to that of conventional images (P = .23 and .20, respectively), whereas that of synthetic T2WI and FLAIR was inferior to that of conventional images (both Ps < .001). There were no significant differences in the number of cortical lesions (P = .17 and .53 for each rater) or segmented lesion volumes (P = .61) between the synthetic and conventional image sets. CONCLUSIONS Three-dimensional synthetic MR imaging could serve as an alternative to conventional MR imaging in evaluating MS with a reduced scan time.
Collapse
Affiliation(s)
- S Fujita
- From the Departments of Radiology (S.F., A.H., S.K., C.A., K.K., S.A.).,Department of Radiology (S.F., S.K., O.A.), The University of Tokyo, Tokyo, Japan
| | - K Yokoyama
- Neurology (K.Y., N.H.), Juntendo University, Tokyo, Japan
| | - A Hagiwara
- From the Departments of Radiology (S.F., A.H., S.K., C.A., K.K., S.A.)
| | - S Kato
- From the Departments of Radiology (S.F., A.H., S.K., C.A., K.K., S.A.).,Department of Radiology (S.F., S.K., O.A.), The University of Tokyo, Tokyo, Japan
| | - C Andica
- From the Departments of Radiology (S.F., A.H., S.K., C.A., K.K., S.A.)
| | - K Kamagata
- From the Departments of Radiology (S.F., A.H., S.K., C.A., K.K., S.A.)
| | - N Hattori
- Neurology (K.Y., N.H.), Juntendo University, Tokyo, Japan
| | - O Abe
- Department of Radiology (S.F., S.K., O.A.), The University of Tokyo, Tokyo, Japan
| | - S Aoki
- From the Departments of Radiology (S.F., A.H., S.K., C.A., K.K., S.A.)
| |
Collapse
|
4
|
Kaneko M, Kawai K, Nozawa H, Hata K, Tanaka T, Nishikawa T, Shuno Y, Sasaki K, Emoto S, Murono K, Ishii H, Sonoda H, Watadani T, Takao H, Abe O, Ishihara S. Utility of computed tomography and 18 F-fluorodeoxyglucose with positron emission tomography/computed tomography for distinguishing appendiceal mucocele caused by mucinous adenocarcinoma from other pathologies. Colorectal Dis 2020; 22:1984-1990. [PMID: 32780478 DOI: 10.1111/codi.15308] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 08/04/2020] [Indexed: 02/08/2023]
Abstract
AIM Differentiating appendiceal mucocele with mucinous adenocarcinoma from other pathologies before surgery is difficult. The objective of this study was to evaluate the utility of CT and 18 F-fluorodeoxyglucose (FDG) with positron emission tomography (PET)/CT for differentiating mucinous adenocarcinoma of appendiceal mucocele from other pathologies. METHOD The study included 25 patients who underwent surgery for clinically diagnosed appendiceal mucoceles detected on CT at the University of Tokyo Hospital. Among these patients, 19 underwent FDG-PET/CT preoperatively. We compared features of the CT imaging findings and maximum standard uptake values (SUVmax ) detected by FDG-PET/CT between mucocele with mucinous adenocarcinoma and other pathologies. RESULTS A total of 13 men (52%) and 12 women (48%) were included in this study, with a median age of 65 years (range 34-83). There were six patients (24%) with pathologically confirmed mucinous adenocarcinoma, 15 patients (60%) with appendiceal mucinous neoplasm and four patients (16%) with simple mucocele caused by chronic inflammation. On the CT findings, wall irregularity was the only significant feature for the two groups in this study (83.3% vs 0.0%, P < 0.01). There was a significant difference in the SUVmax levels on PET/CT between the two groups (100.0% vs 20.0%, P < 0.01). CONCLUSION Distinguishing between mucocele with mucinous adenocarcinoma and other pathologies using imaging modalities is challenging. Our results suggest that wall irregularity on CT and elevated SUVmax on PET/CT are useful factors that can be employed for such discrimination.
Collapse
Affiliation(s)
- M Kaneko
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - K Kawai
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - H Nozawa
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - K Hata
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - T Tanaka
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - T Nishikawa
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - Y Shuno
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - K Sasaki
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - S Emoto
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - K Murono
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - H Ishii
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - H Sonoda
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - T Watadani
- Department of Radiology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - H Takao
- Department of Radiology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - O Abe
- Department of Radiology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| | - S Ishihara
- Department of Surgical Oncology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan
| |
Collapse
|
5
|
Kurokawa R, Ota Y, Gonoi W, Hagiwara A, Kurokawa M, Mori H, Maeda E, Amemiya S, Usui Y, Sato N, Nakata Y, Moritani T, Abe O. MRI Findings of Immune Checkpoint Inhibitor-Induced Hypophysitis: Possible Association with Fibrosis. AJNR Am J Neuroradiol 2020; 41:1683-1689. [PMID: 32763900 PMCID: PMC7583108 DOI: 10.3174/ajnr.a6692] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 04/11/2020] [Accepted: 06/02/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND PURPOSE Hypophysitis is one of the well-known adverse effects of immune checkpoint inhibitors. Immune checkpoint inhibitor-induced hypophysitis frequently causes irreversible hypopituitarism, which requires long-term hormone replacement. Despite the high frequency and clinical significance, characteristic MR imaging findings of immune checkpoint inhibitor-induced hypophysitis have not been established. In the present study, we aimed to review and extract the MR imaging features of immune checkpoint inhibitor-induced hypophysitis. MATERIALS AND METHODS This retrospective international multicenter study comprised 20 patients with melanoma who were being treated with immune checkpoint inhibitors and clinically diagnosed with immune checkpoint inhibitor-induced hypophysitis. Three radiologists evaluated the following MR imaging findings: enlargement of the pituitary gland and stalk; homogeneity of enhancement of the pituitary gland; presence/absence of a well-defined poorly enhanced area and, if present, its location, shape, and signal intensity in T2WI; and enhancement pattern in contrast-enhanced dynamic MR imaging. Clinical symptoms and hormone levels were also recorded. RESULTS Enlargement of the pituitary gland and stalk was observed in 12 and 20 patients, respectively. Nineteen patients showed poorly enhanced lesions (geographic hypoenhancing lesions) in the anterior lobe, and 11 of these lesions showed hypointensity on T2WI. Thyrotropin deficiency and corticotropin deficiency were observed in 19/20 and 12/17 patients, respectively, which persisted in 12/19 and 10/12 patients, respectively, throughout the study period. CONCLUSIONS Pituitary geographic hypoenhancing lesions in the anterior lobe of the pituitary gland are characteristic and frequent MR imaging findings of immune checkpoint inhibitor-induced hypophysitis. They reflect fibrosis and are useful in distinguishing immune checkpoint inhibitor-induced hypophysitis from other types of hypophysitis/tumors.
Collapse
Affiliation(s)
- R Kurokawa
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Ota
- Division of Neuroradiology (Y.O., T.M.), Department of Radiology, Michigan Medicine, Ann Arbor, Michigan
| | - W Gonoi
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - A Hagiwara
- Department of Radiology (A.H.), Juntendo University School of Medicine, Tokyo, Japan
| | - M Kurokawa
- Department of Radiology (M.K.), Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - H Mori
- Department of Radiology (H.M.), Jichi Medical University, Tochigi-ken, Japan
| | - E Maeda
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - S Amemiya
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Usui
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Sato
- Department of Radiology (N.S.), Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
| | - Y Nakata
- Department of Radiology (Y.N.), National Center of Neurology and Psychiatry, Tokyo, Japan
| | - T Moritani
- Division of Neuroradiology (Y.O., T.M.), Department of Radiology, Michigan Medicine, Ann Arbor, Michigan
| | - O Abe
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| |
Collapse
|
6
|
Hagiwara A, Hori M, Andica C, Abe O, Aoki S. Myelin Imaging Can Be Affected by a Number of Factors. AJNR Am J Neuroradiol 2020; 41:E43-E44. [PMID: 32439652 DOI: 10.3174/ajnr.a6525] [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: 11/07/2022]
Affiliation(s)
- A Hagiwara
- Department of RadiologyJuntendo University School of MedicineTokyo, Japan
| | - M Hori
- Department of RadiologyJuntendo University School of MedicineTokyo, Japan
- Department of Diagnostic RadiologyToho University Omori Medical CenterTokyo, Japan
| | - C Andica
- Department of RadiologyJuntendo University School of MedicineTokyo, Japan
| | - O Abe
- Department of Radiology, Graduate School of MedicineThe University of TokyoTokyo, Japan
| | - S Aoki
- Department of RadiologyJuntendo University School of MedicineTokyo, Japan
| |
Collapse
|
7
|
Hagiwara A, Kamagata K, Shimoji K, Yokoyama K, Andica C, Hori M, Fujita S, Maekawa T, Irie R, Akashi T, Wada A, Suzuki M, Abe O, Hattori N, Aoki S. White Matter Abnormalities in Multiple Sclerosis Evaluated by Quantitative Synthetic MRI, Diffusion Tensor Imaging, and Neurite Orientation Dispersion and Density Imaging. AJNR Am J Neuroradiol 2019; 40:1642-1648. [PMID: 31515218 DOI: 10.3174/ajnr.a6209] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 06/06/2019] [Accepted: 07/28/2019] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE A number of MR-derived quantitative metrics have been suggested to assess the pathophysiology of MS, but the reports about combined analyses of these metrics are scarce. Our aim was to assess the spatial distribution of parameters for white matter myelin and axon integrity in patients with relapsing-remitting MS by multiparametric MR imaging. MATERIALS AND METHODS Twenty-four patients with relapsing-remitting MS and 24 age- and sex-matched controls were prospectively scanned by quantitative synthetic and 2-shell diffusion MR imaging. Synthetic MR imaging data were used to retrieve relaxometry parameters (R1 and R2 relaxation rates and proton density) and myelin volume fraction. Diffusion tensor metrics (fractional anisotropy and mean, axial, and radial diffusivity) and neurite orientation and dispersion index metrics (intracellular volume fraction, isotropic volume fraction, and orientation dispersion index) were retrieved from diffusion MR imaging data. These data were analyzed using Tract-Based Spatial Statistics. RESULTS Patients with MS showed significantly lower fractional anisotropy and myelin volume fraction and higher isotropic volume fraction in widespread white matter areas. Areas with different isotropic volume fractions were included within areas with lower fractional anisotropy. Myelin volume fraction showed no significant difference in some areas with significantly decreased fractional anisotropy in MS, including in the genu of the corpus callosum and bilateral anterior corona radiata, whereas myelin volume fraction was significantly decreased in some areas where fractional anisotropy showed no significant difference, including the bilateral posterior limb of the internal capsule, external capsule, sagittal striatum, fornix, and uncinate fasciculus. CONCLUSIONS We found differences in spatial distribution of abnormality in fractional anisotropy, isotropic volume fraction, and myelin volume fraction distribution in MS, which might be useful for characterizing white matter in patients with MS.
Collapse
Affiliation(s)
- A Hagiwara
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
- Department of Radiology (A.H., S.F., T.M., R.I., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - K Kamagata
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
| | - K Shimoji
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
- Department of Diagnostic Radiology (K.S.), Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan
| | - K Yokoyama
- Neurology (K.Y., N.H.), Juntendo University School of Medicine, Tokyo, Japan
| | - C Andica
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
| | - M Hori
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
- Department of Radiology (M.H.), Toho University Omori Medical Center, Tokyo, Japan
| | - S Fujita
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
- Department of Radiology (A.H., S.F., T.M., R.I., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - T Maekawa
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
- Department of Radiology (A.H., S.F., T.M., R.I., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - R Irie
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
- Department of Radiology (A.H., S.F., T.M., R.I., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - T Akashi
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
| | - A Wada
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
| | - M Suzuki
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
| | - O Abe
- Department of Radiology (A.H., S.F., T.M., R.I., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - N Hattori
- Neurology (K.Y., N.H.), Juntendo University School of Medicine, Tokyo, Japan
| | - S Aoki
- From the Departments of Radiology (A.H., K.K., K.S., C.A., M.H., S.F., T.M., R.I., T.A., A.W., M.S., S.A.)
| |
Collapse
|
8
|
Kiritoshi T, Yamashita H, Takahashi W, Ogita M, Nakagawa K, Abe O. EP-1419 Salvage concurrent chemoradiotherapy for postoperative locoregional recurrence of esophageal cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31839-0] [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: 10/26/2022]
|
9
|
Maekawa T, Hagiwara A, Hori M, Andica C, Haruyama T, Kuramochi M, Nakazawa M, Koshino S, Irie R, Kamagata K, Wada A, Abe O, Aoki S. Effect of Gadolinium on the Estimation of Myelin and Brain Tissue Volumes Based on Quantitative Synthetic MRI. AJNR Am J Neuroradiol 2019; 40:231-237. [PMID: 30591507 DOI: 10.3174/ajnr.a5921] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 07/04/2018] [Accepted: 11/12/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE The effect of gadolinium on the estimation of myelin has not been reported. The aim of the current study was to investigate the effects of gadolinium on automatic myelin and brain tissue volumetry via quantitative synthetic MR imaging. MATERIALS AND METHODS The study included 36 patients who were referred for brain metastases screening, and quantitative synthetic MR imaging data before and after gadolinium-based contrast agent administration were analyzed retrospectively. Brain metastases were detected in 17 patients. WM volume, GM volume, CSF volume, non-WM/GM/CSF volume, myelin volume, brain parenchymal volume, myelin fraction (myelin volume/brain parenchymal volume), and intracranial volume were estimated. T1 and T2 relaxation times, proton density, and myelin partial volume per voxel averaged across the brain parenchyma were also analyzed. RESULTS In patients with and without metastases after gadolinium-based contrast agent administration, measurements of WM and myelin volumes, and myelin fraction were significantly increased (+26.65 and +29.42 mL, +10.14 and +12.46 mL, +0.88% and +1.09%, respectively), whereas measurements of GM, CSF, brain parenchymal, and intracranial volumes were significantly decreased (-36.23 and -34.49 mL, -20.77 and -18.94 mL, -6.76 and -2.84 mL, -27.41 and -21.84 mL, respectively). Non-WM/GM/CSF volume did not show a significant change. T1, T2, and proton density were significantly decreased (-51.34 and -46.84 ms, -2.67 and -4.70 ms, -1.05%, and -1.28%, respectively) after gadolinium-based contrast agent administration, whereas measurements of myelin partial volume were significantly increased (+0.78% and +0.75%, respectively). CONCLUSIONS Gadolinium had a significant effect on the automatic calculation of myelin and brain tissue volumes using quantitative synthetic MR imaging, which can be explained by decreases in T1, T2, and proton density.
Collapse
Affiliation(s)
- T Maekawa
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
- Department of Radiology (T.M., A.H., S.K., R.I., O.A.), Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo, Japan
| | - A Hagiwara
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
- Department of Radiology (T.M., A.H., S.K., R.I., O.A.), Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo, Japan
| | - M Hori
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - C Andica
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - T Haruyama
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
- Department of Radiological Sciences (T.H., M.K.), Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - M Kuramochi
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
- Department of Radiological Sciences (T.H., M.K.), Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - M Nakazawa
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - S Koshino
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
- Department of Radiology (T.M., A.H., S.K., R.I., O.A.), Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo, Japan
| | - R Irie
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
- Department of Radiology (T.M., A.H., S.K., R.I., O.A.), Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo, Japan
| | - K Kamagata
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - A Wada
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - O Abe
- Department of Radiology (T.M., A.H., S.K., R.I., O.A.), Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo, Japan
| | - S Aoki
- From the Department of Radiology (T.M., A.H., M.H., C.A., T.H., M.K., M.N., S.K., R.I., K.K., A.W., S.A.), Juntendo University School of Medicine, Tokyo, Japan
| |
Collapse
|
10
|
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]
|
11
|
Wise T, Radua J, Via E, Cardoner N, Abe O, Adams TM, Amico F, Cheng Y, Cole JH, de Azevedo Marques Périco C, Dickstein DP, Farrow TFD, Frodl T, Wagner G, Gotlib IH, Gruber O, Ham BJ, Job DE, Kempton MJ, Kim MJ, Koolschijn PCMP, Malhi GS, Mataix-Cols D, McIntosh AM, Nugent AC, O'Brien JT, Pezzoli S, Phillips ML, Sachdev PS, Salvadore G, Selvaraj S, Stanfield AC, Thomas AJ, van Tol MJ, van der Wee NJA, Veltman DJ, Young AH, Fu CH, Cleare AJ, Arnone D. Common and distinct patterns of grey-matter volume alteration in major depression and bipolar disorder: evidence from voxel-based meta-analysis. Mol Psychiatry 2017; 22:1455-1463. [PMID: 27217146 PMCID: PMC5622121 DOI: 10.1038/mp.2016.72] [Citation(s) in RCA: 357] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 03/01/2016] [Accepted: 03/23/2016] [Indexed: 12/11/2022]
Abstract
Finding robust brain substrates of mood disorders is an important target for research. The degree to which major depression (MDD) and bipolar disorder (BD) are associated with common and/or distinct patterns of volumetric changes is nevertheless unclear. Furthermore, the extant literature is heterogeneous with respect to the nature of these changes. We report a meta-analysis of voxel-based morphometry (VBM) studies in MDD and BD. We identified studies published up to January 2015 that compared grey matter in MDD (50 data sets including 4101 individuals) and BD (36 data sets including 2407 individuals) using whole-brain VBM. We used statistical maps from the studies included where available and reported peak coordinates otherwise. Group comparisons and conjunction analyses identified regions in which the disorders showed common and distinct patterns of volumetric alteration. Both disorders were associated with lower grey-matter volume relative to healthy individuals in a number of areas. Conjunction analysis showed smaller volumes in both disorders in clusters in the dorsomedial and ventromedial prefrontal cortex, including the anterior cingulate cortex and bilateral insula. Group comparisons indicated that findings of smaller grey-matter volumes relative to controls in the right dorsolateral prefrontal cortex and left hippocampus, along with cerebellar, temporal and parietal regions were more substantial in major depression. These results suggest that MDD and BD are characterised by both common and distinct patterns of grey-matter volume changes. This combination of differences and similarities has the potential to inform the development of diagnostic biomarkers for these conditions.
Collapse
Affiliation(s)
- T Wise
- Department of Psychological Medicine, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - J Radua
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Research Unit, FIDMAG Germanes Hospitalàries – CIBERSAM, Sant Boi de Llobregat, Barcelona, Spain
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - E Via
- Mental Health, Parc Taulí Sabadell-CIBERSAM, University Hospital, Sabadell, Barcelona, Spain
- Department of Psychiatry, Bellvitge University Hospital-IDIBELL, Barcelona, Spain
| | - N Cardoner
- Mental Health, Parc Taulí Sabadell-CIBERSAM, University Hospital, Sabadell, Barcelona, Spain
| | - O Abe
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - T M Adams
- Department of Psychological Medicine, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - F Amico
- Department of Psychiatry, Trinity College Institute of Neuroscience, Trinity College, Dublin, Ireland
| | - Y Cheng
- Department of Psychiatry, The 1st Affiliated Hospital of Kunming Medical University, Kunming, PR China
| | - J H Cole
- Computational, Cognitive and Clinical Neuroimaging Laboratory, Department of Medicine, Imperial College London, London, UK
| | - C de Azevedo Marques Périco
- Department of Neuroscience, Medical School, Fundação do ABC, Santo André, SP, Brazil
- ABC Center of Studies on Mental Health, Santo André, SP, Brazil
| | - D P Dickstein
- PediMIND Program, Bradley Hospital, Department of Psychiatry, Brown University, East Providence, RI, USA
| | - T F D Farrow
- Academic Clinical Neurology, Department of Neuroscience, University of Sheffield, Sheffield, UK
| | - T Frodl
- Department of Psychiatry and Psychotherapy, Otto-von-Guericke University, Magdeburg, Germany
- Department of Psychiatry, University of Dublin, Trinity College, Dublin, Ireland
| | - G Wagner
- Psychiatric Brain and Body Research Group Jena, Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany
| | - I H Gotlib
- Department of Psychology, Stanford University, Stanford, CA, USA
| | - O Gruber
- Section for Experimental Psychopathology and Neuroimaging, Department of General Psychiatry, Heidelberg University Hospital, Heidelberg, Germany
| | - B J Ham
- Department of Psychiatry, Korea University College of Medicine, Seoul, South Korea
| | - D E Job
- Neuroimaging Sciences, University of Edinburgh, Edinburgh, UK
- Scottish Imaging Network–A Platform for Scientific Excellence (SINAPSE), Giffnock, UK
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - M J Kempton
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Department of Neuroimaging, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - M J Kim
- Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH, USA
| | - P C M P Koolschijn
- Department of Psychology, Dutch Autism and ADHD Research Center, Brain and Cognition, University of Amsterdam, Amsterdam, The Netherlands
| | - G S Malhi
- CADE Clinic, Discipline of Psychiatry, Sydney Medical School, University of Sydney, Sydney, NSW, Australia
| | - D Mataix-Cols
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - A M McIntosh
- Division of Psychiatry, University of Edinburgh, Edinburgh, UK
| | - A C Nugent
- Experimental Therapeutics and Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA
| | - J T O'Brien
- Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne, UK
- Department of Psychiatry, University of Cambridge, Cambridge, UK
| | - S Pezzoli
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- Department of Neuroscience, Medical School, University of Sheffield, Sheffield, UK
| | - M L Phillips
- Department of Psychiatry, University of Pittsburgh, School of Medicine, Pittsburgh, PA
| | - P S Sachdev
- Centre for Healthy Brain Ageing (CHeBA), School of Psychiatry, University of New South Wales, Randwick, NSW, Australia
- Neuropsychiatric Institute, Prince of Wales Hospital, Randwick, NSW, Australia
| | - G Salvadore
- Janssen Research and Development, Titusville, NJ, USA
| | - S Selvaraj
- Department of Psychiatry and Behavioral Sciences, Center of Excellence on Mood Disorders, Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - A C Stanfield
- The Patrick Wild Centre, Royal Edinburgh Hospital, University of Edinburgh, Edinburgh, UK
| | - A J Thomas
- Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne, UK
| | - M J van Tol
- NeuroImaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - N J A van der Wee
- Department of Psychiatry, Leiden University Medical Center, Leiden University, Leiden, The Netherlands
- Leiden Institute for Brain and Cognition, Leiden, The Netherlands
| | - D J Veltman
- Department of Psychiatry, VU University Medical Center, Amsterdam, The Netherlands
| | - A H Young
- Department of Psychological Medicine, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - C H Fu
- Department of Psychological Medicine, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
- School of Psychology, University of East London, London, UK
| | - A J Cleare
- Department of Psychological Medicine, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - D Arnone
- Department of Psychological Medicine, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| |
Collapse
|
12
|
Hagiwara A, Hori M, Yokoyama K, Nakazawa M, Ueda R, Horita M, Andica C, Abe O, Aoki S. Analysis of White Matter Damage in Patients with Multiple Sclerosis via a Novel In Vivo MR Method for Measuring Myelin, Axons, and G-Ratio. AJNR Am J Neuroradiol 2017; 38:1934-1940. [PMID: 28775058 PMCID: PMC7963610 DOI: 10.3174/ajnr.a5312] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [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: 03/15/2017] [Accepted: 05/24/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Myelin and axon volume fractions can now be estimated via MR imaging in vivo, as can the g-ratio, which equals the ratio of the inner to the outer diameter of a nerve fiber. The purpose of this study was to evaluate WM damage in patients with MS via this novel MR imaging technique. MATERIALS AND METHODS Twenty patients with relapsing-remitting MS with a combined total of 149 chronic plaques were analyzed. Myelin volume fraction was calculated based on simultaneous tissue relaxometry. Intracellular and CSF compartment volume fractions were quantified via neurite orientation dispersion and density imaging. Axon volume fraction and g-ratio were calculated by combining these measurements. Myelin and axon volume fractions and g-ratio were measured in plaques, periplaque WM, and normal-appearing WM. RESULTS All metrics differed significantly across the 3 groups (P < .001, except P = .027 for g-ratio between periplaque WM and normal-appearing WM). Those in plaques differed most from those in normal-appearing WM. The percentage changes in plaque and periplaque WM metrics relative to normal-appearing WM were significantly larger in absolute value for myelin volume fraction than for axon volume fraction and g-ratio (P < .001, except P = .033 in periplaque WM relative to normal-appearing WM for comparison between myelin and axon volume fraction). CONCLUSIONS In this in vivo MR imaging study, the myelin of WM was more damaged than axons in plaques and periplaque WM of patients with MS. Myelin and axon volume fractions and g-ratio may potentially be useful for evaluating WM damage in patients with MS.
Collapse
Affiliation(s)
- A Hagiwara
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
- Department of Radiology (A.H., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - M Hori
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
| | - K Yokoyama
- Neurology (K.Y.), Juntendo University School of Medicine, Tokyo, Japan
| | - M Nakazawa
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
| | - R Ueda
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
- Department of Radiological Sciences (R.U.), Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - M Horita
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
| | - C Andica
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
| | - O Abe
- Department of Radiology (A.H., O.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - S Aoki
- From the Departments of Radiology (A.H., M. Hori., M.N., R.U., M. Horita, C.A., S.A.)
| |
Collapse
|
13
|
Abe O, Misaka S, Sato H, Ogata H, Ono T, Shikama Y, Onoue S, Yabe H, Kimura J. Effect Of Epigallocatechin Gallate on Pharmacokinetics of NADOLOL In Healthy Volunteers. Clin Ther 2017. [DOI: 10.1016/j.clinthera.2017.05.097] [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: 11/15/2022]
|
14
|
Misaka S, Abe O, Ono T, Ono Y, Ogata H, Miura I, Shikama Y, Yabe H, Kimura J. Single Ingestion of Green Tea Substantially Decrease Plasma Concentrations of Nadolol In Healthy Volunteers. Clin Ther 2017. [DOI: 10.1016/j.clinthera.2017.05.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
15
|
Mori H, Masutani Y, Abe O, Aoki S, Hayashi N, Masumoto T, Yoshikawa T, Yamada H, Ohtomo K. Visualization of Central Nervous System Nerve Communications Using Diffusion Tensor Imaging. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/197140090401700201] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Diffusion tensor imaging (DTI) is a magnetic resonance (MR) technique used to analyze diffusion anisotropy of the central nervous system (CNS) and can demonstrate subtle white matter anatomy. In particular, tractography is expected to be a unique, non-invasive tool to provide more pertinent insights into brain structure and orientation not accessible with conventional MRI. Data collection was performed in a normal volunteer on a 1.5-T MRI system using several techniques including six axis single-shot echo planar imaging (EPI), over six axis EPI, and periodically rotated overlapping parallel lines with enhanced reconstruction techniques. Tractography was generated by a continuous tracking method with our original software, Volume-One (for viewing volumetric image data) and VizDT-II (for analysis of DTI data). Using these data, estimated tracts were generated in arcuate fibers of cerebrum, cingulum, superior longitudinal fasciculus, uncinate fasciculus, inferior longitudinal fasciculus, corpus callosum, fornix, anterior thalamic radiation, central thalamic radiation, thalamo-parietal fibers, optic radiation, superior cerebellar peduncle, middle cerebellar peduncle, inferior cerebellar peduncle and intrinsic commissure paths of the hipoccampous. DTI including tractography allows differentiation between complex white matter tracts. The information regarding the detailed relationship may be useful for diagnosis of the location and extent of brain lesions, and preoperative planning.
Collapse
Affiliation(s)
- H. Mori
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - Y. Masutani
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - O. Abe
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - S. Aoki
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - N. Hayashi
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - T. Masumoto
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - T. Yoshikawa
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - H. Yamada
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| | - K. Ohtomo
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; Japan
| |
Collapse
|
16
|
Shinozaki T, Imamura Y, Kohashi R, Dezawa K, Nakaya Y, Sato Y, Watanabe K, Morimoto Y, Shizukuishi T, Abe O, Haji T, Tabei K, Taira M. Spatial and Temporal Brain Responses to Noxious Heat Thermal Stimuli in Burning Mouth Syndrome. J Dent Res 2016; 95:1138-46. [DOI: 10.1177/0022034516653580] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Burning mouth syndrome (BMS) is an idiopathic orofacial pain condition. Although the pathophysiology of BMS is not clearly understood, central and peripheral neuropathic mechanisms are thought to be involved. The authors compared brain response to noxious heat stimuli in 16 right-handed women with primary BMS and 15 sex- and age-matched right-handed healthy female controls. A thermal stimulus sequence of 32 °C to 40 °C to 32 °C to 49 °C was repeated 4 times in a cycle. Warm and noxious heat stimuli were delivered with a Peltier thermode placed on the right palm or right lower lip for 32 s each in a session. Functional magnetic resonance imaging data were obtained by recording echoplanar images with a block design. Statistical Parametric Mapping 8 software was used to analyze the data. Patients and controls both reported feeling more pain during palm stimulation than during lip stimulation. Repetition of noxious heat stimulus on the lower lip but not on the palm induced habituation in brain activity in the cingulate cortex without reduction in pain perception. Multiple regression analysis revealed a correlation between perceived pain intensity and suppression of brain activity in the anterior cingulate cortex when the repeated thermal sequence was applied at the lower lip. Furthermore, the response of the parahippocampal area differed in BMS patients and controls when the same repeated thermal sequence was applied at the palm. The authors’ findings indicate that BMS patients show specific brain responses due to impaired function of the central and peripheral nervous systems (clinical trial registration: UMIN000015002).
Collapse
Affiliation(s)
- T. Shinozaki
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - Y. Imamura
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - R. Kohashi
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Dezawa
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Nakaya
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Sato
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Watanabe
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Morimoto
- Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan
| | - T. Shizukuishi
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - O. Abe
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - T. Haji
- Brain Activity Imaging Center, ATR-Promotions Inc., Osaka, Japan
| | - K. Tabei
- Department of Dementia Prevention and Therapeutics, Mie University Graduate School of Medicine, Tsu, Japan
| | - M. Taira
- Department of Cognitive Neurobiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo, Japan
| |
Collapse
|
17
|
Aoki Y, Watanabe T, Abe O, Kuwabara H, Yahata N, Takano Y, Iwashiro N, Natsubori T, Takao H, Kawakubo Y, Kasai K, Yamasue H. Oxytocin's neurochemical effects in the medial prefrontal cortex underlie recovery of task-specific brain activity in autism: a randomized controlled trial. Mol Psychiatry 2015; 20:447-53. [PMID: 25070538 PMCID: PMC4378254 DOI: 10.1038/mp.2014.74] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 05/02/2014] [Accepted: 06/06/2014] [Indexed: 01/22/2023]
Abstract
The neuropeptide oxytocin may be an effective therapeutic strategy for the currently untreatable social and communication deficits associated with autism. Our recent paper reported that oxytocin mitigated autistic behavioral deficits through the restoration of activity in the ventromedial prefrontal cortex (vmPFC), as demonstrated with functional magnetic resonance imaging (fMRI) during a socio-communication task. However, it is unknown whether oxytocin exhibited effects at the neuronal level, which was outside of the specific task examined. In the same randomized, double-blind, placebo-controlled, within-subject cross-over clinical trial in which a single dose of intranasal oxytocin (24 IU) was administered to 40 men with high-functioning autism spectrum disorder (UMIN000002241/000004393), we measured N-acetylaspartate (NAA) levels, a marker for neuronal energy demand, in the vmPFC using (1)H-magnetic resonance spectroscopy ((1)H-MRS). The differences in the NAA levels between the oxytocin and placebo sessions were associated with oxytocin-induced fMRI signal changes in the vmPFC. The oxytocin-induced increases in the fMRI signal could be predicted by the NAA differences between the oxytocin and placebo sessions (P=0.002), an effect that remained after controlling for variability in the time between the fMRI and (1)H-MRS scans (P=0.006) and the order of administration of oxytocin and placebo (P=0.001). Furthermore, path analysis showed that the NAA differences in the vmPFC triggered increases in the task-dependent fMRI signals in the vmPFC, which consequently led to improvements in the socio-communication difficulties associated with autism. The present study suggests that the beneficial effects of oxytocin are not limited to the autistic behavior elicited by our psychological task, but may generalize to other autistic behavioral problems associated with the vmPFC.
Collapse
Affiliation(s)
- Y Aoki
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - T Watanabe
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan,Department of Physiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - O Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan,Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - H Kuwabara
- Department of Child Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Yahata
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Takano
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Iwashiro
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - T Natsubori
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Takao
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Kawakubo
- Department of Child Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - K Kasai
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan,Japan Science and Technology Agency, CREST, Tokyo, Japan,Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan. E-mail:
| |
Collapse
|
18
|
Goto M, Abe O, Aoki S, Hayashi N, Miyati T, Takao H, Matsuda H, Yamashita F, Iwatsubo T, Mori H, Kunimatsu A, Ino K, Yano K, Ohtomo K. Influence of parameter settings in voxel-based morphometry 8. Using DARTEL and region-of-interest on reproducibility in gray matter volumetry. Methods Inf Med 2014; 54:171-8. [PMID: 25345402 DOI: 10.3414/me14-01-0049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 09/17/2014] [Indexed: 01/29/2023]
Abstract
OBJECTIVES To investigate whether reproducibility of gray matter volumetry is influenced by parameter settings for VBM 8 using Diffeomorphic Anatomical Registration Through Exponentiated Lie Algebra (DARTEL) with region-of-interest (ROI) analyses. METHODS We prepared three-dimensional T1-weighted magnetic resonance images (3D-T1WIs) of 21 healthy subjects. All subjects were imaged with each of five MRI systems. Voxel-based morphometry 8 (VBM 8) and WFU PickAtlas software were used for gray matter volumetry. The bilateral ROI labels used were those provided as default settings with the software: Frontal Lobe, Hippocampus, Occipital Lobe, Orbital Gyrus, Parietal Lobe, Putamen, and Temporal Lobe. All 3D-T1WIs were segmented to gray matter with six parameters of VBM 8, with each parameter having between three and eight selectable levels. Reproducibility was evaluated as the standard deviation (mm³) of measured values for the five MRI systems. RESULTS Reproducibility was influenced by 'Bias regularization (BiasR)', 'Bias FWHM', and 'De-noising filter' settings, but not by 'MRF weighting', 'Sampling distance', or 'Warping regularization' settings. Reproducibility in BiasR was influenced by ROI. Superior reproducibility was observed in Frontal Lobe with the BiasR1 setting, and in Hippocampus, Parietal Lobe, and Putamen with the BiasR3*, BiasR1, and BiasR5 settings, respectively. CONCLUSION Reproducibility of gray matter volumetry was influenced by parameter settings in VBM 8 using DARTEL and ROI. In multi-center studies, the use of appropriate settings in VBM 8 with DARTEL results in reduced scanner effect.
Collapse
Affiliation(s)
- M Goto
- Masami Goto, Department of Radiological Technology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan, E-mail:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Inamo Y, Ryou N, Abe O, Fuchigami S, Hashimoto K, Fuchigami T, Hayashi K. A case report: a pediatric patient with acute lupus hemophagocytic syndrome; differences from reactive hemophagocytosis caused by hypercytokinemia. Mod Rheumatol 2014; 12:72-5. [DOI: 10.3109/s101650200012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
20
|
Mori H, Kunimatsu A, Abe O, Sasaki H, Takao H, Nojo T, Kawai K, Saito N, Ohtomo K. Diagnostic Ability of Fluid-Attenuated Inversion Recovery MR Imaging to Detect Remnant or Recurrent Meningiomas after Resection. Neuroradiol J 2012; 25:163-71. [PMID: 24028909 DOI: 10.1177/197140091202500202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2011] [Accepted: 01/31/2012] [Indexed: 01/16/2023] Open
Abstract
It has been suggested that a difference in signal intensity (SI) between the resection cavity and normal cerebrospinal fluid (CSF) on fluid-attenuated inversion recovery (FLAIR) magnetic resonance imaging (MRI) in partially resected gliomas indicates subsequent or coincident tumor progression. We considered that this would hold true for resected meningiomas as well. Hence, we aimed to assess whether or not such a difference in the SI during the follow-up evaluation helps predict residual or recurrent tumor in resected meningiomas. We evaluated 63 patients with resected meningiomas. The SI within the resection cavity observed on FLAIR images was qualitatively and quantitatively assessed during follow-up. Qualitative analysis comprised visual comparison of the SI in the resection cavity with that of normal CSF by neuroradiologists. The SI in the resection cavity was quantitatively assessed by region of interest (ROI) analysis and normalized against the background noise and CSF SI. Normalized SI recorded during follow-up was compared with that recorded immediately after resection. Tumor progression was defined as a 20% or greater increase in the diameter of the longest residual or recurrent meningioma (Response Evaluation Criteria in Solid Tumors). The sensitivity and specificity of the elevated SI in the resection cavity for indicating residual or recurrent tumor were calculated. Qualitative analysis by FLAIR MRI showed that patients with remnant tumor following surgery had a prolonged SI increase in the resection cavity. Further, SI increase could not always be observed before recurrence, and both SI increase and regrowth remnant/recurrence could be detected in the same MRI examination. In resected meningiomas, leakage of tumor elements into the resection cavity, presumably tumor cells, manifests as an SI increase on FLAIR images and indicates residual or recurrent tumor. However, unlike the previous reports on partially resected gliomas, we concluded that the SI change does not always precede tumor progression or recurrence.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, Graduate School and Faculty of Medicine, The University of Tokyo; Tokyo, Japan -
| | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Kamagata K, Motoi Y, Abe O, Shimoji K, Hori M, Nakanishi A, Sano T, Kuwatsuru R, Aoki S, Hattori N. White matter alteration of the cingulum in Parkinson disease with and without dementia: evaluation by diffusion tensor tract-specific analysis. AJNR Am J Neuroradiol 2012; 33:890-5. [PMID: 22241380 DOI: 10.3174/ajnr.a2860] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE In PD, the neurodegenerative process begins in the brain stem and extends to the limbic system and finally into the cerebral cortex. We used diffusion tensor tractography to investigate the FA of the cingulate fiber tracts in patients with PD with and without dementia. MATERIALS AND METHODS Fifteen patients with PD, 15 patients with PDD, and 15 age-matched healthy controls underwent diffusion tensor imaging with a 3T MR imager. Diffusion tensor tractography images of the anterior and posterior cingulate fiber tracts were generated. Mean diffusivity and FA were measured along the tractography of the anterior and posterior cingulate fiber tracts. One-way ANOVA with the Scheffé post hoc test was used to compare results among the groups. RESULTS FA was significantly lower in patients with PDD than in healthy controls in both the anterior and the posterior cingulate fiber tracts (P = .003, P = .015) and significantly lower in patients with PD than in healthy controls (P = .003) in the anterior cingulate fiber tract. There were no significant mean diffusivity differences among the groups. MMSE and FA values of the anterior cingulate fiber tracts in patients with PDD were significantly correlated (r = 0.633, P < .05). CONCLUSIONS The reduced FA in patients with PD and PDD might reflect neuropathologic changes such as Lewy body pathology in the cingulate fibers. This abnormality might contribute to the dementing process in PD.
Collapse
Affiliation(s)
- K Kamagata
- Department of Radiology, Juntendo University School of Medicine, 2-1-1, Hongo Bunkyo-ku Tokyo 113-8421 Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Abstract
BACKGROUND AND PURPOSE DTI provides a sensitive measure of change in the microstructure of white matter integrity. The purpose of our study was to investigate age-related changes, sex differences, and age-by-sex interactions in white matter integrity (FA, AD, and RD) across the whole brain with a large sample. MATERIALS AND METHODS A total of 857 healthy subjects (mean age = 56.1 ± 9.9 years; age range = 24.9-84.8 years) were included in this study. All subjects were scanned at 3T. With use of TBSS, we examined the effects of age and sex on FA, AD, and RD in the white matter. RESULTS Global FA was negatively correlated with age (R(2) = 0.18, P < .0001), and global AD and RD were positively correlated with age (AD: R(2) = 0.02, P < .0001; RD: R(2) = 0.19, P < .0001). The correlation between age and global AD, however, was weak. Voxelwise analysis revealed a number of regions where FA was negatively correlated with age, with most of these regions showing a significant positive correlation between RD and age. There was a significant age-related FA increase in several white matter regions. Voxelwise analysis also revealed many regions where FA, AD, or RD differed between men and women; however, no region showed a significant interaction between age and sex. CONCLUSIONS Our results suggest that age-related changes in white matter integrity are more strongly associated with myelin sheath degeneration than with axonal degeneration, and that, in some specific regions, the number of remyelinated axons might increase with age. Our results also suggest that there are no sex differences in the aging process of the white matter.
Collapse
Affiliation(s)
- S Inano
- Department of Radiology, University of Tokyo, Bunkyo-ku, Tokyo, Japan.
| | | | | | | | | |
Collapse
|
23
|
Nishizawa H, Abe O, Okuyama J, Kobayashi M, Arai N. Population genetic structure and implications for natal philopatry of nesting green turtles Chelonia mydas in the Yaeyama Islands, Japan. ENDANGER SPECIES RES 2011. [DOI: 10.3354/esr00355] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
24
|
Inoue H, Yamasue H, Tochigi M, Suga M, Iwayama Y, Abe O, Yamada H, Rogers MA, Aoki S, Kato T, Sasaki T, Yoshikawa T, Kasai K. Functional (GT)n polymorphisms in promoter region ofN-methyl-d-aspartate receptor 2A subunit (GRIN2A) gene affect hippocampal and amygdala volumes. Genes, Brain and Behavior 2010; 9:269-75. [DOI: 10.1111/j.1601-183x.2009.00557.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
25
|
Okuyama J, Shimizu T, Abe O, Yoseda K, Arai N. Wild versus head-started hawksbill turtles Eretmochelys imbricata: post-release behavior and feeding adaptions. ENDANGER SPECIES RES 2010. [DOI: 10.3354/esr00250] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
26
|
Yamasue H, Kakiuchi C, Tochigi M, Inoue H, Suga M, Abe O, Yamada H, Sasaki T, Rogers MA, Aoki S, Kato T, Kasai K. Association between mitochondrial DNA 10398A>G polymorphism and the volume of amygdala. Genes Brain Behav 2008; 7:698-704. [PMID: 18518927 DOI: 10.1111/j.1601-183x.2008.00408.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Mitochondrial calcium regulation plays a number of important roles in neurons. Mitochondrial DNA (mtDNA) is highly polymorphic, and its interindividual variation is associated with various neuropsychiatric diseases and mental functions. An mtDNA polymorphism, 10398A>G, was reported to affect mitochondrial calcium regulation. Volume of hippocampus and amygdala is reportedly associated with various mental disorders and mental functions and is regarded as an endophenotype of mental disorders. The present study investigated the relationship between the mtDNA 10398A>G polymorphism and the volume of hippocampus and amygdala in 118 right-handed healthy subjects. The brain morphometry using magnetic resonance images employed both manual tracing volumetry in the native space and voxel-based morphometry (VBM) in the spatially normalized space. Amygdala volume was found to be significantly larger in healthy subjects with 10398A than in those with 10398G by manual tracing, which was confirmed by the VBM. Brain volumes in the other gray matter regions and all white matter regions showed no significant differences associated with the polymorphism. These provocative findings might provide a clue to the complex relationship between mtDNA, brain structure and mental disorders.
Collapse
Affiliation(s)
- H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Iwata NK, Aoki S, Okabe S, Arai N, Terao Y, Kwak S, Abe O, Kanazawa I, Tsuji S, Ugawa Y. Evaluation of corticospinal tracts in ALS with diffusion tensor MRI and brainstem stimulation. Neurology 2008; 70:528-32. [DOI: 10.1212/01.wnl.0000299186.72374.19] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
28
|
Nakamura S, Abe O. Postoperative adjuvant therapy with tamoxifen, tegafur-uracil (UFT), or both in women with node-negative breast cancer: A pooled analysis of six randomized controlled trials (relapse-free survival data). J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
633 Background: In Japan, 6 randomized controlled trials of the oral 5-fluorouracil derivative tegafur-uracil (UFT) and tamoxifen (TAM), given alone or in combination, have been simultaneously performed in women with node-negative breast cancer. We performed a pooled analysis, based on the intention to treat, of individual patient data from these 6 trials (involving 2934 patients). Data on overall survival, the primary endpoint, have been reported previously (Noguchi et al., Journal of Clinical Oncology, 2005). We now report data on relapse-free survival (median follow-up, 6.2 years). Methods: Three 3-arm randomized controlled trials (surgery alone vs. surgery plus TAM vs. surgery plus UFT) and three 4-arm randomized controlled trials (surgery alone vs. surgery plus TAM vs. surgery plus UFT vs. surgery plus TAM and UFT) were performed in women with node-negative breast cancer. The results underwent a pooled analysis. Results: The 5-year relapse-free survival rate was 87.9% with surgery alone (n = 860; risk ratio [RR], 1), 90.5% with surgery plus TAM (n = 865; RR, 0.81; confidential interval [CI], 0.60–1.11; P = 0.21), 89.9% with surgery plus UFT (n = 860; RR, 0.83; CI, 0.66–1.21; P = 0.46), and 92.7% with surgery plus UFT and TAM (n = 349; RR, 0.63; CI, 0.39–0.99; P = 0.046). Subset analysis showed that combination therapy with UFT and TAM was not effective for women with estrogen-receptor-negative breast cancer (RR, 0.90; CI, 0.46–1.75; P = 0.75), but was very effective for women with estrogen-receptor-positive breast cancer (RR, 0.39; CI, 0.19–0.79; P = 0.009). Conclusions: Our results suggest that the effectiveness of oral fluoropyrimidine derivatives is enhanced by concurrent treatment with TAM in women with node-negative breast cancer. This contrasts with the results of previous studies showing that the response to anthracycline-based chemotherapy is attenuated in patients concurrently receiving TAM. No significant financial relationships to disclose.
Collapse
Affiliation(s)
- S. Nakamura
- ACETBC study group, T. Ikeda, M. Toi, S. Noguchi, J. Uchino, R. Abe, S. Miura, H. Koyama, K. Sugimachi; St Lukes International Hospital, Tokyo, Japan; Teikyo University, Tokyo, Japan; Tokyo Metropolitan Komagome Hospital, Tokyo, Japan; Osaka University, Osaka, Japan; Kushiro Rousai Hospital, Kushiro, Japan; Fukushima Medical University, Fukushima, Japan; Aichi Cancer Center, Nagoya, Japan; Osaka Medical Center, Osaka, Japan; Kyushu Central Hospital, Fukuoka, Japan
| | - O. Abe
- ACETBC study group, T. Ikeda, M. Toi, S. Noguchi, J. Uchino, R. Abe, S. Miura, H. Koyama, K. Sugimachi; St Lukes International Hospital, Tokyo, Japan; Teikyo University, Tokyo, Japan; Tokyo Metropolitan Komagome Hospital, Tokyo, Japan; Osaka University, Osaka, Japan; Kushiro Rousai Hospital, Kushiro, Japan; Fukushima Medical University, Fukushima, Japan; Aichi Cancer Center, Nagoya, Japan; Osaka Medical Center, Osaka, Japan; Kyushu Central Hospital, Fukuoka, Japan
| |
Collapse
|
29
|
Sarma VVSS, Abe O, Yoshida N, Saino T. Continuous shipboard sampling system for determination of triple oxygen isotopes and O2/Ar ratio by dual-inlet mass spectrometry. Rapid Commun Mass Spectrom 2006; 20:3503-8. [PMID: 17078103 DOI: 10.1002/rcm.2756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A continuous shipboard sampling system was developed for the determination of the isotopic composition of the triple oxygen isotopes and oxygen to argon (O(2)/Ar) ratios in dissolved air. In this system, dissolved air is separated by a hollow fiber membrane degassing module. This system collects dissolved air quantitatively and rapidly. The sample flow rate through the membrane is critical for the fractionation of the oxygen isotopes and the O(2)/Ar ratio and should be < 2 mL/min. Fractionation of oxygen between the liquid and gas phase of the air-saturated water was found to be similar to that of earlier reports. The advantages of this method over existing techniques include rapid collection of samples (30 min/sample), high efficiency in extraction of gases from the liquid phase, and the lack of a sample preparation step (e.g. degassing).
Collapse
Affiliation(s)
- V V S S Sarma
- SORST, Japan Science and Technology Agency, Kawaguchi, Japan.
| | | | | | | |
Collapse
|
30
|
Yamasue H, Ishijima M, Abe O, Sasaki T, Yamada H, Suga M, Rogers M, Minowa I, Someya R, Kurita H, Aoki S, Kato N, Kasai K. Neuroanatomy in monozygotic twins with Asperger disorder discordant for comorbid depression. Neurology 2005; 65:491-2. [PMID: 16087928 DOI: 10.1212/01.wnl.0000172360.99310.3f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Takada Y, Abe O, Nagao M, Suzuki A, Kobayashi M, Oi R, Hashimoto K, Shibuno T. Seasonal Variation of Turbidity in a Fringing Reef Water in Urasoko Bay, Ishigaki Island: Re-suspension due to Northerly Winds. ACTA ACUST UNITED AC 2005. [DOI: 10.3755/jcrs.2005.37] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
32
|
Mori H, Aoki S, Abe O, Hayashi N, Masutani Y, Ohtomo K, Oya S, Morita A. Diffusion property following functional hemispherectomy in hemimegalencephaly. Acta Radiol 2004; 45:778-81. [PMID: 15624522 DOI: 10.1080/02841850410001303] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Diffusion-tensor imaging (DTI), a unique magnetic resonance technique for analysis of diffusion-anisotropy of the brain, can identify subtle white matter changes in vivo. To investigate changes of truncated neurofibers, DTI was conducted prior to and following functional hemispherectomy in a female infant for refractory epilepsy associated with hemimegalencephaly. Anisotropy of the amputated pyramidal tract decreased relative to the unaffected side after surgery, which reflects secondary degeneration in neurofibers. In DTI applied to infants, differentiation between developmental changes and changes associated with the current phenomenon must be evaluated cautiously. Standardization of diffusion-tensor analysis of developmental change is desirable.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, Graduate School of Medicine and Faculty of Medicine, University of Tokyo, Tokyo Japan.
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Kusama M, Ikeda T, Enomoto K, Kasumi F, Tominaga T, Haga S, Fukuda M, Yamaguchi S, Nakazato H, Abe O. 396 Randomized controlled study comparing surgery alone, surgery plus tamoxifen, and surgery plus tegafur-uracil in patients with node-negative breast cancer: 5-year results from the Kanto cooperative study group of adjuvant chemo-endocrine therapy for breast cancer (ACETBC) of Japan. EJC Suppl 2003. [DOI: 10.1016/s1359-6349(03)90428-9] [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: 10/26/2022] Open
|
34
|
Sarma VVSS, Abe O, Saino T. Chromatographic Separation of Nitrogen, Argon, and Oxygen in Dissolved Air for Determination of Triple Oxygen Isotopes by Dual-Inlet Mass Spectrometry. Anal Chem 2003; 75:4913-7. [PMID: 14674471 DOI: 10.1021/ac034314r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A chromatographic system was developed to separate oxygen from nitrogen, argon, carbon dioxide, and water vapor mixture for the determination of precise isotopic ratio measurements of oxygen in dissolved air. This system separates oxygen not only quantitatively but also rapidly as well; typical oxygen separation takes about 30 min. Fractionation of oxygen between liquid and gas phase was found to be similar to that of earlier reports.
Collapse
Affiliation(s)
- V V S S Sarma
- Hydrospheric-Atmospheric Research Center and Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-464 8601, Japan.
| | | | | |
Collapse
|
35
|
Kunimatsu A, Aoki S, Masutani Y, Abe O, Mori H, Ohtomo K. Three-dimensional white matter tractography by diffusion tensor imaging in ischaemic stroke involving the corticospinal tract. Neuroradiology 2003; 45:532-5. [PMID: 12856090 DOI: 10.1007/s00234-003-0974-4] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.2] [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: 01/03/2003] [Accepted: 01/06/2003] [Indexed: 11/25/2022]
Abstract
Diffusion tensor MR imaging (DTI) provides information on diffusion anisotropy, which can be expressed with three-dimensional (3D) white matter tractography. We used 3D white matter tractography to show the corticospinal tract in eight patients with acute or early subacute ischaemic stroke involving the posterior limb of the internal capsule or corona radiata and to assess involvement of the tract. Infarcts and the tract were shown simultaneously, providing information on their spatial relationships. In five of the eight patients, 3D fibre tract maps showed the corticospinal tract in close proximity to the infarct but not to pass through it. All these patients recovered well, with maximum improvement from the lowest score on manual muscle testing (MMT) up to the full score through rehabilitation. In the other three patients the corticospinal tract was shown running through the infarct; reduction in MMT did not necessarily improve favourably or last longer, other than in one patient. As 3D white matter tractography can show spatial relationships between the corticospinal tract and an infarct, it might be helpful in prognosis of gross motor function.
Collapse
Affiliation(s)
- A Kunimatsu
- Department of Radiology, Graduate School of Medicine, Tokyo University, 7-3-1 Hongo, Bunkyo-ku, 113-8655 Tokyo, Japan.
| | | | | | | | | | | |
Collapse
|
36
|
Kunimatsu A, Abe O, Aoki S, Hayashi N, Okubo T, Masumoto T, Mori H, Yoshikawa T, Yamada H, Ohtomo K. Neuro-Behçet's disease: analysis of apparent diffusion coefficients. Neuroradiology 2003; 45:524-7. [PMID: 12879324 DOI: 10.1007/s00234-002-0890-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 08/02/2002] [Accepted: 09/20/2002] [Indexed: 11/27/2022]
Abstract
Little is known about the diffusion properties of brain lesions in neuro-Behçet's disease (NBD). We looked at 19 NBD lesions (13 active, six chronic) in six patients, using diffusion-weighted MRI (DWI). We calculated the apparent diffusion coefficients (ADC) of the lesions and compared them with normal contralateral brain, expressing this ratio as relative ADC (rADC). The rADC was 1.29+/-0.33 in active and 1.44+/-0.47 in chronic lesions, i.e., significantly higher than in the control regions. Increased diffusivity in both active and chronic phases in NBD is different from the pattern in ischaemic infarcts, so that ADC analysis might be helpful for differentiating between these conditions.
Collapse
Affiliation(s)
- A Kunimatsu
- Department of Radiology, Graduate School of Medicine, Tokyo University, 7-3-1 Hongo, Bunkyo-Ku 113-8655, Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Yamasue H, Kasai K, Iwanami A, Ohtani T, Yamada H, Abe O, Kuroki N, Fukuda R, Tochigi M, Furukawa S, Sadamatsu M, Sasaki T, Aoki S, Ohtomo K, Asukai N, Kato N. Voxel-based analysis of MRI reveals anterior cingulate gray-matter volume reduction in posttraumatic stress disorder due to terrorism. Proc Natl Acad Sci U S A 2003; 100:9039-43. [PMID: 12853571 PMCID: PMC166434 DOI: 10.1073/pnas.1530467100] [Citation(s) in RCA: 253] [Impact Index Per Article: 12.0] [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: 01/26/2003] [Accepted: 06/06/2003] [Indexed: 11/18/2022] Open
Abstract
MRI studies using the manual tracing method have shown a smaller-than-normal hippocampal volume in patients with posttraumatic stress disorder (PTSD). However, these studies have yielded inconsistent results, and brain structures other than the hippocampus have not been well investigated. A recently developed, fully automated method called voxel-based morphometry enables an exploration of structural changes throughout the brain by applying statistical parametric mapping to high-resolution MRI. Here we first used this technology in patients with PTSD. Participants were 9 victims of the Tokyo subway sarin attack with PTSD and 16 matched victims of the same traumatic event without PTSD. The voxel-based morphometry showed a significant gray-matter volume reduction in the left anterior cingulate cortex (ACC) in trauma survivors with PTSD compared with those without PTSD. The severity of the disorder was negatively correlated with the gray-matter volume of the left ACC in PTSD subjects. There were no significant differences in other gray-matter regions or any of the white-matter regions between two groups. The present study demonstrates evidence for structural abnormalities of ACC in patients with PTSD. Together with previous functional neuroimaging studies showing a dysfunction of this region, the present findings provide further support for the important role of ACC, which is pivotally involved in attention, emotional regulation, and conditioned fear, in the pathology of PTSD.
Collapse
Affiliation(s)
- H Yamasue
- Department of Neuropsychiatry and Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Abe O, Nakane M, Aoki S, Hayashi N, Masumoto T, Kunimatsu A, Mori H, Tamura A, Ohtomo K. MR imaging of postischemic neuronal death in the substantia nigra and thalamus following middle cerebral artery occlusion in rats. NMR Biomed 2003; 16:152-159. [PMID: 12884359 DOI: 10.1002/nbm.823] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The goal of this study was to investigate apparent diffusion coefficient (ADC) and T(2) relaxation time (T(2)) in the substantia nigra and thalamus after middle cerebral artery occlusion in rats. In the substantia nigra ipsilateral to infarct, ADC was significantly lower and T(2) was significantly higher on the third and fourth days, but they did not change significantly on the first, second, eighth and 15th days. In the ipsilateral thalamus, ADC and T(2) did not change significantly between the first and fourth days, but were significantly lower on the eighth and 15th days. This combination of MR findings suggested that secondary degeneration in the thalamus was different from that in the substantia nigra.
Collapse
Affiliation(s)
- O Abe
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Ikeda T, Uchino J, Abe R, Miura S, Koyama H, Sugimachi K, Akazawa K, Abe O. Postoperative adjuvant therapy with tamoxifen, tegafur-uracil (UFT) or both in women with node-negative breast cancer: A pooled analysis of six randomized controlled trials (ACETBC 4th trial). Breast 2003. [DOI: 10.1016/s0960-9776(03)80115-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
40
|
Mori H, Aoki S, Okubo T, Hayashi N, Masumoto T, Yoshikawa T, Tago M, Shin M, Kurita H, Abe O, Ohtomo K. Two-dimensional thick-slice MR digital subtraction angiography in the assessment of small to medium-size intracranial arteriovenous malformations. Neuroradiology 2003; 45:27-33. [PMID: 12525951 DOI: 10.1007/s00234-002-0844-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [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: 04/25/2002] [Accepted: 06/18/2002] [Indexed: 10/20/2022]
Abstract
Assessment of intracranial arteriovenous malformations (AVMs) by conventional catheter angiography carries risks; moreover, this invasive procedure is often repeated for follow-up. We investigated the clinical applicability of two-dimensional thick-slice, contrast-enhanced magnetic resonance digital subtraction angiography (2D MRDSA) with high temporal resolution in the assessment of AVMs. We performed 78 2D MRDSA studies of treated or untreated small to medium-size AVMs on a 1.5 tesla imager. Two observers independently evaluated demonstration of nidus flow void on T2-weighted images and each component of the AVM on 2D MRDSA employing a three-point grading scale. In 55 patients with AVMs, the mean ratings of nidus flow voids, feeding vessels, nidi, draining vessels and early venous filling on MRI were 2.8, 2.4, 2.6, 2.8 and 2.8, respectively. sensitivity, specificity, positive and negative predictive values for an AVM using 2D MRDSA were 87, 100, 100 and 78%, respectively and for nidus flow voids on T2-weighted images 80, 91, 96 and 66%, respectively. 2D MRDSA can thus demonstrate haemodynamic features of AVMs. It can be employed as a less invasive, dynamic angiographic tool for follow-up of AVMs previously delineated by catheter angiography.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Yamasue H, Fukui T, Fukuda R, Yamada H, Yamasaki S, Kuroki N, Abe O, Kasai K, Tsujii K, Iwanami A, Aoki S, Ohtomo K, Kato N, Kato T. 1H-MR spectroscopy and gray matter volume of the anterior cingulate cortex in schizophrenia. Neuroreport 2002; 13:2133-7. [PMID: 12438941 DOI: 10.1097/00001756-200211150-00029] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Schizophrenic and normal control subjects were examined using both H-magnetic resonance spectroscopy (MRS) and structural MR imaging, in order to accurately assess the partial volume within the spectroscopic volume of interest (VOI) in the anterior cingulate cortex. The gray matter volume within VOI correlated positively with the N-acetyl-aspartate (NAA) to choline (Cho) ratio in schizophrenics only, not in controls. Schizophrenic patients had a reduced NAA/Cho ratio and an elevated Cho/creatine ratio compared to controls after the partial volume effect was eliminated. There was a significant negative correlation between the NAA/Cho ratio and the severity of blunted affect symptom in schizophrenics. These results provide further support to the idea that the measures of H-MRS indicate not only neuronal loss but also neuronal dysfunction in schizophrenia.
Collapse
Affiliation(s)
- H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Mori H, Abe O, Aoki S, Masumoto T, Yoshikawa T, Kunimatsu A, Hayashi N, Ohtomo K. Hemorrhagic brain metastases with high signal intensity on diffusion-weighted MR images. A case report. Acta Radiol 2002; 43:563-6. [PMID: 12485251 DOI: 10.1080/j.1600-0455.2002.430604.x] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
Abstract
Diffusion-weighted MR imaging has been applicable to the differential diagnosis of abscesses and necrotic or cystic brain tumors. However, restricted water diffusion is not necessarily specific for brain abscess. We describe ring-enhancing metastases of lung carcinoma characterized by high signal intensity on diffusion-weighted MR images. The signal pattern probably reflected intralesional hemorrhage. The present report adds to the growing literature regarding the differential diagnosis of ring-enhancing brain lesions.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Mori H, Abe O, Aoki S, Masumoto T, Yoshikawa T, Kunimatsu A, Hayashi N, Ohtomo K. Hemorrhagic brain metastases with high signal intensity on diffusion-weighted MR images. A case report. Acta Radiol 2002. [PMID: 12485251 DOI: 10.1034/j.1600-0455.2002.430604.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Diffusion-weighted MR imaging has been applicable to the differential diagnosis of abscesses and necrotic or cystic brain tumors. However, restricted water diffusion is not necessarily specific for brain abscess. We describe ring-enhancing metastases of lung carcinoma characterized by high signal intensity on diffusion-weighted MR images. The signal pattern probably reflected intralesional hemorrhage. The present report adds to the growing literature regarding the differential diagnosis of ring-enhancing brain lesions.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
44
|
Yoshikawa T, Abe O, Tsuchiya K, Okubo T, Tobe K, Masumoto T, Hayashi N, Mori H, Yamada H, Aoki S, Ohtomo K. Diffusion-weighted magnetic resonance imaging of dural sinus thrombosis. Neuroradiology 2002; 44:481-8. [PMID: 12070721 DOI: 10.1007/s00234-002-0772-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [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: 10/24/2001] [Accepted: 12/11/2001] [Indexed: 10/27/2022]
Abstract
Magnetic resonance imaging (MRI) is useful to diagnose dural sinus thrombosis. However, the representative appearance of dural sinus thrombosis on diffusion-weighted MRI has not been established. This study was aimed at determining whether cytotoxic or vasogenic edema is more predominant in the affected cerebral parenchyma and assessing the time courses and prognosis of dural sinus thrombosis lesion. The studies on sixteen patients with dural sinus thrombosis who underwent diffusion-weighted MRI were retrospectively reviewed. The diagnosis was confirmed by digital subtraction angiography in 11 patients and magnetic resonance angiography in five patients. Diffusion-weighted images with echo-planar imaging were obtained using two or three b values, with the highest b value of up to 1,000 s/mm(2). A region of interest was placed on an area of abnormal signal intensity to calculate apparent diffusion coefficients (ADCs). Nine of the 16 patients had lesions with an increased ADC, whereas, three of these nine patients also had lesions with a decreased ADC. Among 11 patients who underwent initial MRI within 7 days of their last episode, eight had lesions with an increased ADC, of whom three had lesions mixed with both decreased and increased ADC areas. Follow-up studies of these three patients revealed the development of hemorrhagic infarction in two and subcortical hemorrhage in one. Vasogenic edema develops more predominantly and earlier in dural sinus thrombosis, though cytotoxic edema was also associated with the pathological changes in the early phase. Decrease of ADC value is presumed to reflect severe pathological conditions and indicate possible future development of infarction or hemorrhage.
Collapse
Affiliation(s)
- T Yoshikawa
- Department of Radiology, University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Mori H, Abe O, Okubo T, Hayashi N, Yoshikawa T, Kunimatsu A, Yamada H, Aoki S, Ohtomo K. Diffusion property in a hamartomatous lesion of neurofibromatosis type 1. J Comput Assist Tomogr 2001; 25:537-9. [PMID: 11473182 DOI: 10.1097/00004728-200107000-00005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Though diffusion-weighted MRI has been applied to various intracranial lesions, few reports had been presented about cerebral hamartomatous lesions in patients with neurofibromatosis type 1 (NF1). In this study, we report the interval changes of apparent diffusion coefficient (ADC) in a presumed hamartomatous lesion. In our case, the ADC increased slightly over a 3 year period. This diffusion property may provide specific insight into the etiology of cerebral hamartomatous lesions observed in NF1.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, Graduate School of Medicine, University of Tokyo, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Inoue Y, Abe O, Kawakami T, Ozaki T, Inoue M, Yokoyama I, Yoshikawa K, Ohtomo K. Metabolism of 99mTc-ethylcysteinate dimer in infarcted brain tissue of rats. J Nucl Med 2001; 42:802-7. [PMID: 11337580] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
Abstract
UNLABELLED Brain SPECT with 99mTc-ethylcysteinate dimer (99mTc-ECD) reveals a subacute cerebral infarct as a hypoactive area, even in the presence of postischemic hyperperfusion. The brain retention of 99mTc-ECD depends on hydrophilic conversion mediated by enzymes, and impaired enzymatic trapping is hypothesized to depress the retention efficiency in the infarcted region. The aim of this study was to determine whether the metabolic rate of 99mTc-ECD is actually reduced in infarcted brain tissue. METHODS In 50 mmol/L phosphate buffer (pH 7.4), 99mTc-ECD was incubated for 30 min with homogenates of rat brain tissue with and without triphenyltetrazolium chloride (TTC) staining. The ratio of polar products was determined by thin-layer chromatography as a function of incubation time, and metabolic rates were obtained. Permanent focal ischemia was induced by occlusion of the right middle cerebral artery (MCA) in rats. The brain was removed 24 h after MCA occlusion, and the infarcted area was defined by TTC staining. The metabolic rate of 99mTc-ECD was determined in homogenates of infarcted tissue, contralateral noninfarcted tissue, and tissue sampled from sham-operated rats. The infarct volume was measured by direct and indirect methods to assess volume expansion caused by edema, and the metabolic rate in infarcted tissue was corrected for the effect of edema. RESULTS TTC staining had no effect on the metabolic rate of 99mTc-ECD. The metabolic rates in the infarcted tissue were 0.222%/min +/- 0.054%/min and 0.285%/min +/- 0.064%/min before and after correction for edema, respectively. These rates were significantly lower than those in the contralateral noninfarcted tissue (0.426%/min +/- 0.028%/min) and the tissue sampled from the sham-operated rats (0.439%/min +/- 0.031%/min). No substantial difference in rates was observed between the contralateral tissue and the tissue from the sham-operated rats. CONCLUSION The results of this study showed that infarction decreases the activity of enzymes that mediate the hydrophilic conversion of 99mTc-ECD in the brain and suggest that reduced metabolic activity is related to decreased accumulation of 99mTc-ECD in hyperperfused infarcts.
Collapse
Affiliation(s)
- Y Inoue
- Department of Radiology, Institute of Medical Science, University of Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
47
|
Okubo T, Yoshioka N, Hayashi N, Abe O, Masumoto T, Sasaki T, Ohtomo K. Contrast-enhanced magnetic resonance imaging of the cranial nerves in patients with acoustic schwannoma: correlation with surgical findings. Acta Otolaryngol Suppl 2001; 542:13-7. [PMID: 10897393 DOI: 10.1080/000164800454594] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Eighteen patients with acoustic schwannoma were examined on a 1.5-T magnetic resonance imaging (MRI) unit with precontrast and postcontrast T1-weighted spin-echo sequences. Each abnormality was assessed in terms of the size, location, extensions and signal intensity of the lesions. If a nerve was enhanced and was involved by the tumor around the fundus of the internal auditory canal (IAC), the nerve was interpreted to be the originating nerve. The postcontrast T1-weighted images revealed enhanced masses of the cerebellopontine angle and/or the IAC in all cases. In 11 of the 19 operated patients with shwannomas, the site of tumor origin (or origin nerve) was confirmed by surgery. In 2 of the 11 cases (18%), surgical findings coincided with the T1-weighted image findings. Facial nerve enhancement on the ipsilateral side of the tumor was noted in 10 cases (53%) and the contralateral facial nerve enhancement was demonstrated in 7 (70%). The enhancement of facial nerve associated with acoustic schwannoma was not correlated to the degree of nerve compression by the tumor. These results demonstrate that it was possible, although infrequent, to predict the site of origin of acoustic schwannoma before surgery in some patients. Improvement of the imaging matrix or multiplanar reconstruction techniques with three-dimensional data acquisition may make it possible to overcome the limitations of MRI.
Collapse
Affiliation(s)
- T Okubo
- Department of Radiology, University of Tokyo, Faculty of Medicine, Japan.
| | | | | | | | | | | | | |
Collapse
|
48
|
Abe O, Kimura H, Minakami H, Akami M, Inoue M, Saito A, Otsuki K. Outbreak of gastroenteritis caused by echovirus type 6 in an orphanage in Japan. J Infect 2000; 41:285-6. [PMID: 11120625 DOI: 10.1053/jinf.2000.0748] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
49
|
Zhu L, Saito N, Abe O, Okubo T, Yamada H, Kawahara N, Asai A, Kirino T. Changes in the apparent diffusion coefficient of water and T2 relaxation time in gerbil hippocampus after mild ischemia. Neuroreport 2000; 11:3333-6. [PMID: 11059897 DOI: 10.1097/00001756-200010200-00014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Selective neuronal death of the hippocampal CA1 area after mild ischemia is known as delayed neuronal death (DND). Progression of DND was evaluated using 7T MRI in gerbils. In the CA1, the T2 relaxation time started to increase on day 3 and was significantly higher on day 4 than that of the control gerbils. However, the apparent diffusion coefficient of water (ADC) was significantly lower on day 1 than in the control and continued to decline up to day 4. Changes in T2 coincided with loss of MAP2 immunoreactivity, while the ADC decrease preceded these changes. After 1 month, the ADC had returned to within the normal range, while T2 had decreased to below the control level. These results suggest that MRI is useful for monitoring DND.
Collapse
Affiliation(s)
- L Zhu
- Department of Neurosurgery, University of Tokyo Hospital, Japan
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Abe O, Okubo T, Hayashi N, Saito N, Iriguchi N, Shirouzu I, Kojima Y, Masumoto T, Ohtomo K, Sasaki Y. Temporal changes of the apparent diffusion coefficients of water and metabolites in rats with hemispheric infarction: experimental study of transhemispheric diaschisis in the contralateral hemisphere at 7 tesla. J Cereb Blood Flow Metab 2000; 20:726-35. [PMID: 10779017 DOI: 10.1097/00004647-200004000-00010] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The purpose of the present study was to clarify the temporal changes of the apparent diffusion coefficients (ADCs) of cerebral metabolites during early focal ischemia using stimulated echo acquisition mode with short echo time at a 7 T magnet to assess the pathophysiology of the reduction in diffusion properties observed both in the ischemic cerebral hemisphere and in the contralateral hemisphere. The ADCs of metabolites in the infarcted hemisphere 1 hour and 3 hours after the onset of ischemia decreased with 25% and 29% for choline containing compounds (Cho), 16% and 26% for creatine and phosphocreatine (Cre), and 19% and 19% for N-acetylaspartate (NAA), respectively, compared with the ADC values 2 hours later in the contralateral hemisphere. There were decreases in the ADC of Cho, Cre, and NAA with 21%, 7%, and 18% 8 hours later, respectively, in the noninfarcted hemisphere, which suggested transhemispheric diaschisis in rats with focal cerebral ischemia. The present study proposed that the diffusion characteristics of the brain metabolites might offer new insights into circulatory and metabolic alteration in the cerebral intracellular circumstance.
Collapse
Affiliation(s)
- O Abe
- Department of Radiology, University of Tokyo, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|