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Lu H, Meng T, You Y, Liu Y, He K, Kan Y, Zhang H. PHANTOM EXPERIMENTAL STUDY ON PATIENT DOSES OBTAINED FROM 320-MULTIDETECTOR-ROW COMPUTED TOMOGRAPHY IN WHOLE-BRAIN PERFUSION SCAN. RADIATION PROTECTION DOSIMETRY 2022; 198:1424-1434. [PMID: 36125221 DOI: 10.1093/rpd/ncac178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 06/28/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
This study aimed to precisely evaluate organ dose and effective dose (E) obtained from a 320-multidetector-row computed tomography (CT) scanner in brain perfusion scans and to estimate the conversion factor (k) between E and dose length product (DLP). A total of 270 thermoluminescent dosemeters were implanted in a male anthropomorphic phantom to measure air kerma. The ratios of mass-energy absorption coefficients were used to convert air kerma into organ doses. The organ doses ranged from 0.01 to 150 mGy. Doses in brain, salivary glands and red bone marrow were relatively high, and dose in eye lens reached about 110 mGy. The resulting effective dose was 5.30 mSv. The resulting conversion factor k = (0.0022 ± 0.0002) mSv·(mGy·cm)-1 was not significantly different from that of 0.0021 mSv·(mGy·cm)-1 reported for head CT scan in ICRP Publication 102.
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Affiliation(s)
- Heqing Lu
- Department of Medical Equipment, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Ting Meng
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Yang You
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Ying Liu
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Kai He
- Department of Logistics Support, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Yandong Kan
- Department of Logistics Support, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Haowei Zhang
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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牛 善, 刘 宏, 刘 沛, 张 梦, 李 硕, 梁 礼, 李 楠, 刘 国. [Nonlocal low-rank and sparse matrix decomposition for low-dose cerebral perfusion CT image restoration]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2022; 42:1309-1316. [PMID: 36210703 PMCID: PMC9550540 DOI: 10.12122/j.issn.1673-4254.2022.09.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Indexed: 01/24/2023]
Abstract
OBJECTIVE To present a nonlocal low-rank and sparse matrix decomposition (NLSMD) method for low-dose cerebral perfusion CT image restoration. METHODS Low-dose cerebral perfusion CT images were first partitioned into a matrix, and the low- rank and sparse matrix decomposition model was constructed to obtain high-quality low-dose cerebral perfusion CT images. The cerebral hemodynamic parameters were calculated from the restored high-quality CT images. RESULTS In the phantom study, the average structured similarity (SSIM) value of the sequential images obtained by filtered back-projection (FBP) algorithm was 0.9438, which was increased to 0.9765 using the proposed algorithm; the SSIM values of cerebral blood flow (CBF) and cerebral blood volume (CBV) map obtained by FBP algorithm were 0.7005 and 0.6856, respectively, which were increased using the proposed algorithm to 0.7871 and 0.7972, respectively. CONCLUSION The proposed method can effectively suppress noises in low-dose cerebral perfusion CT images to obtain accurate cerebral hemodynamic parameters.
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Affiliation(s)
- 善洲 牛
- 赣南师范大学数学与计算机科学学院,江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
- 赣南师范大学赣州市计算成像重点实验室,江西 赣州 341000Ganzhou Key Laboratory of Computational Imaging, Gannan Normal University, Ganzhou 341000, China
| | - 宏 刘
- 赣南师范大学数学与计算机科学学院,江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
- 赣南师范大学赣州市计算成像重点实验室,江西 赣州 341000Ganzhou Key Laboratory of Computational Imaging, Gannan Normal University, Ganzhou 341000, China
| | - 沛沄 刘
- 赣南师范大学数学与计算机科学学院,江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
- 赣南师范大学赣州市计算成像重点实验室,江西 赣州 341000Ganzhou Key Laboratory of Computational Imaging, Gannan Normal University, Ganzhou 341000, China
| | - 梦真 张
- 赣南师范大学数学与计算机科学学院,江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
- 赣南师范大学赣州市计算成像重点实验室,江西 赣州 341000Ganzhou Key Laboratory of Computational Imaging, Gannan Normal University, Ganzhou 341000, China
| | - 硕 李
- 赣南师范大学数学与计算机科学学院,江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
- 赣南师范大学赣州市计算成像重点实验室,江西 赣州 341000Ganzhou Key Laboratory of Computational Imaging, Gannan Normal University, Ganzhou 341000, China
| | - 礼境 梁
- 赣南师范大学数学与计算机科学学院,江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
- 赣南师范大学赣州市计算成像重点实验室,江西 赣州 341000Ganzhou Key Laboratory of Computational Imaging, Gannan Normal University, Ganzhou 341000, China
| | - 楠 李
- 赣南师范大学经济管理学院,江西 赣州 341000School of Economics and Management, Gannan Normal University, Ganzhou 341000, China
| | - 国良 刘
- 赣南医学院医学信息工程学院,江西 赣州 341000School of Medical Information Engineering, Gannan Medical University, Ganzhou 341000, China
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牛 善, 刘 宏, 刘 沛, 张 梦, 邱 洋, 黎 钰, 谢 国, 刘 国, 卢 绍. [Low-dose cerebral perfusion CT image restoration using prior image constrained diffusion tensor]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2021; 41:1226-1233. [PMID: 34549715 PMCID: PMC8527232 DOI: 10.12122/j.issn.1673-4254.2021.08.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Indexed: 01/24/2023]
Abstract
OBJECTIVE We propose an efficient method to reduce the noise in low-dose cerebral perfusion CT images using prior image constrained diffusion tensor to reduce the radiation dose in brain CT examination. METHODS By utilizing the redundant information in cerebral perfusion CT images, we embedded the complementary structure information in prior images into lowdose cerebral perfusion CT image restoration process to suppress the image noise and artifacts.We first calculated the diffusion tensor for the low-dose cerebral perfusion CT image and prior image separately and then constructed a prior image constrained diffusion tensor (PICDT) to incorporate the structure information from the prior image into low-dose image restoration process. RESULTS In experiments with the Shepp-Logan phantom, the SSIM value of CBF map obtained by the proposed algorithm was increased by 63% as compared with that of the FBP algorithm.In analysis of the clinical dataset, the SSIM value of CBF map obtained by the proposed algorithm was increased by 45% as compared with that of FBP algorithm. CONCLUSION The proposed method can effectively reduce noises and artifacts of low-dose cerebral perfusion CT images while maintaining the structural details to obtain accurate cerebral hemodynamic maps.
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Affiliation(s)
- 善洲 牛
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 宏 刘
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 沛沄 刘
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 梦真 张
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 洋 邱
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 钰 黎
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 国强 谢
- 赣南师范大学数学与计算机科学学院, 江西 赣州 341000School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China
| | - 国良 刘
- 赣南医学院医学信息工程学院, 江西 赣州 341000School of Medical Information Engineering of Gannan Medical University, Ganzhou 341000, China
| | - 绍辉 卢
- 赣南医学院第一附属医院, 江西 赣州 341000First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
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Li Z, Zhang J, Xia C, Zhao F, Zhang K, Li Y, Li L, Pu J, Peng W, Liu K, Guo Y. Radiation doses in CT examinations from the West China Hospital, Sichuan University and setting local diagnostic references levels. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:1010. [PMID: 32953810 PMCID: PMC7475485 DOI: 10.21037/atm-20-5443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 08/12/2020] [Indexed: 11/25/2022]
Abstract
BACKGROUND Our study aims to summarize the data of radiation doses collected from consecutive CT examinations by using the Radiometrics software and contributing to the establishment of the region's diagnostic reference levels (DRLs). METHODS The radiation doses in 158,463 CT examinations performed on 106,275 adults between April 2017 and April 2019 were retrospectively analyzed. The median value and interquartile range (IQR) of volumetric CT dose index (CTDIvol), dose-length product (DLP), effective dose (ED), and size-specific dose estimate (SSDE) were calculated according to the scanning region. RESULTS The median CTDIvol (mGy) for each scanning region was 42.3 (head), 6.2 (chest), and 9.0 (abdomen). The median DLPs (mGy.cm) for single-phase, multi-phase, and all examinations were as follows: 607, 794, and 641 for the head; 220, 393, and 237 for the chest; 298, 1,141, and 570 for the abdomen. The median EDs (mSv) for single-phase, multi-phase, and all examinations are as follows: 1.6, 2.6, and 1.8 for the head; 5.1, 8.1, and 5.3 for the chest; 5.8, 20.3, and 10.4 for the abdomen. CONCLUSIONS Our study's results could provide a basis for the evaluation of CT scanning radiation dosage and supply evidence for the establishment of local DRLs in China's Sichuan Province.
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Affiliation(s)
- Zhenlin Li
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Jinge Zhang
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Chunchao Xia
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Fei Zhao
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Kai Zhang
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Yuming Li
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Lei Li
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Jin Pu
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Wanlin Peng
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Keling Liu
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Yingkun Guo
- Department of Radiology, West China 2nd University Hospital, Sichuan University, Chengdu, China
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Irimia A, Maher AS, Rostowsky KA, Chowdhury NF, Hwang DH, Law EM. Brain Segmentation From Computed Tomography of Healthy Aging and Geriatric Concussion at Variable Spatial Resolutions. Front Neuroinform 2019; 13:9. [PMID: 30936828 PMCID: PMC6431646 DOI: 10.3389/fninf.2019.00009] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 02/05/2019] [Indexed: 12/21/2022] Open
Abstract
When properly implemented and processed, anatomic T 1-weighted magnetic resonance imaging (MRI) can be ideal for the noninvasive quantification of white matter (WM) and gray matter (GM) in the living human brain. Although MRI is more suitable for distinguishing GM from WM than computed tomography (CT), the growing clinical use of the latter technique has renewed interest in head CT segmentation. Such interest is particularly strong in settings where MRI is unavailable, logistically unfeasible or prohibitively expensive. Nevertheless, whereas MRI segmentation is a sophisticated and technically-mature research field, the task of automatically classifying soft brain tissues from CT remains largely unexplored. Furthermore, brain segmentation methods for MRI hold considerable potential for adaptation and application to CT image processing. Here we demonstrate this by combining probabilistic, atlas-based classification with topologically-constrained tissue boundary refinement to delineate WM, GM and cerebrospinal fluid (CSF) from head CT images. The feasibility and utility of this approach are revealed by comparison of MRI-only vs. CT-only segmentations in geriatric concussion victims with both MRI and CT scans. Comparison of the two segmentations yields mean Sørensen-Dice coefficients of 85.5 ± 4.6% (WM), 86.7 ± 5.6% (GM) and 91.3 ± 2.8% (CSF), as well as average Hausdorff distances of 3.76 ± 1.85 mm (WM), 3.43 ± 1.53 mm (GM) and 2.46 ± 1.27 mm (CSF). Bootstrapping results suggest that the segmentation approach is sensitive enough to yield WM, GM and CSF volume estimates within ~5%, ~4%, and ~3% of their MRI-based estimates, respectively. To our knowledge, this is the first 3D segmentation approach for CT to undergo rigorous within-subject comparison with high-resolution MRI. Results suggest that (1) standard-quality CT allows WM/GM/CSF segmentation with reasonable accuracy, and that (2) the task of soft brain tissue classification from CT merits further attention from neuroimaging researchers.
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Affiliation(s)
- Andrei Irimia
- USC Leonard Davis School of Gerontology, Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles, CA, United States
| | - Alexander S Maher
- USC Leonard Davis School of Gerontology, Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles, CA, United States
| | - Kenneth A Rostowsky
- USC Leonard Davis School of Gerontology, Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles, CA, United States
| | - Nahian F Chowdhury
- USC Leonard Davis School of Gerontology, Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles, CA, United States
| | - Darryl H Hwang
- Department of Radiology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States
| | - E Meng Law
- Department of Radiology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States.,Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, CA, United States.,Faculty of Medicine, Nursing and Health Sciences, Central Clinical School, Monash University, Melbourne, VIC, Australia
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Weiqiang Q, Tikun S, Qiongqiong Q, Jinge Z, Chunchao X, Yi L, Chao Y. Asymmetric Cortical Vessel Sign Indicates Hemodynamic Deficits in Adult Patients with Moyamoya Disease. World Neurosurg 2019; 127:e137-e141. [PMID: 30862600 DOI: 10.1016/j.wneu.2019.02.187] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 02/21/2019] [Accepted: 02/22/2019] [Indexed: 02/05/2023]
Abstract
BACKGOUND Asymmetric cortical vessel sign (ACVS) on susceptibility-weighted imaging (SWI) indicates elevated concentration of deoxyhemoglobin and elevated oxygen extraction fraction in patients with cerebral ischemia. This study aimed to clarify whether ACVS is associated with impaired hemodynamics and hyperperfusion syndrome in patients with moyamoya disease (MMD). METHODS Consecutive adult patients with MMD were enrolled. ACVS data on SWI and perfusion data using dynamic perfusion computed tomography were obtained and evaluated preoperatively and on postoperative days 2 and 180. RESULTS A total of 24 patients with MMD were enrolled. Of 11 (45.83%) patients showing positive ACVS before surgery, 8 turned negative on postoperative day 2 and 9 showed absence of ACVS 180 days after surgery. Regions of interest showing positive ACVS had lower cerebral blood flow (CBF, P<0.001), increased cerebral blood volume (P = 0.021), prolonged time to peak (P<0.001), and mean transit time (P = 0.009). No patients with hemorrhagic symptoms showed positive ACVS(P = 0.041) and patients with positive ACVS showed more increase in CBF (P<0.004). CONCLUSIONS In patients with MMD, ACVS on SWI indicates severe impairment in hemodynamics and is associated with more increase in CBF after bypass surgery. Hence, ACVS on SWI might be considered as a neuroimaging marker for the evaluation of hemodynamics in patients with MMD.
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Affiliation(s)
- Qian Weiqiang
- Department of Neurosurgery, West China Hospital of Sichuan University, Sichuan, P.R. China
| | - Shan Tikun
- Department of Neurosurgery, West China Hospital of Sichuan University, Sichuan, P.R. China
| | - Qiu Qiongqiong
- Innovation Center for Neurological Disorders, Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, P.R. China
| | - Zhang Jinge
- Department of Radiology, West China Hospital of Sichuan University, Sichuan, P.R. China
| | - Xia Chunchao
- Department of Radiology, West China Hospital of Sichuan University, Sichuan, P.R. China
| | - Liu Yi
- Department of Neurosurgery, West China Hospital of Sichuan University, Sichuan, P.R. China.
| | - You Chao
- Department of Neurosurgery, West China Hospital of Sichuan University, Sichuan, P.R. China
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Evaluating the Prognosis of Ischemic Stroke Using Low-Dose Multimodal Computed Tomography Parameters in Hyperacute Phase. J Comput Assist Tomogr 2019; 43:22-28. [PMID: 30188358 DOI: 10.1097/rct.0000000000000783] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE The aim of this study was to evaluate the potential value of low-dose multimodal computed tomography (CT) in predicting prognosis of acute ischemic stroke (AIS) within 6 hours. METHODS The admission "one-stop-shop" multimodal CT examination, including noncontrast CT (NCCT), low-dose CT perfusion, and CT angiography (CTA), was performed in patients with symptoms of stroke within 6 hours. Noncontrast CT, CTA source image (CTA-SI), cerebral blood flow (CBF), cerebral blood volume (CBV), time to peak (TTP), and mean transit time (MTT) maps were studied using Alberta Stroke Program Early CT Score (ASPECTS). The regional leptomeningeal collateral (rLMC) score (0-20) was dichotomized into 2 groups: good (11-20) and poor (0-10) rLMC. Poor functional outcomes were defined by a modified Rankin scale score of 3 to 6. RESULTS One hundred forty-four patients were ultimately selected; 43.8% of them showed poor functional outcomes. They had lower ASPECTSs on NCCT, CTA-SI, CBV, CBF, TTP, and MTT, and poor rLMC was more frequently associated with poor functional outcomes (all P < 0.001). In the multivariate analysis for AIS patients with conservative treatment, CTA-SI-ASPECTS 6 or less (odds ratio [OR], 5.9; 95% confidence interval [95% CI], 1.9-18.4; P = 0.002) and poor collaterals (OR, 5.0; 95% CI, 1.3-15.4; P = 0.017), CBV-ASPECTS 6 or less (OR, 8.0; 95% CI, 2.7-24.0; P < 0.001), CBF-ASPECTS 4 or less (OR, 8.0; 95% CI, 2.0-31.5; P = 0.003), MTT-ASPECTS≤3 (OR, 5.8; 95% CI, 1.8-18.1; P = 0.003), TTP-ASPECTS 4 or less (OR, 5.0; 95% CI, 1.6-15.1; P = 0.005), and NCCT-ASPECTS 8 or less (OR, 5.9; 95% CI, 1.7-20.4; P = 0.005) were significantly associated with poor functional outcome. In the multivariate analysis for AIS patients with thrombolysis, CTA-SI-ASPECTS 6 or less (OR, 27.5; 95% CI, 2.9-262.3; P = 0.004), poor collaterals (OR, 28.0; 95% CI, 2.8-283.0; P < 0.028), and CBV-ASPECTS 6 or less (OR, 18.0; 95% CI, 3.0-107.7; P = 0.002) were associated with poor functional outcomes. Furthermore, the area under the curve (AUC) of the combination of CTA-SI-ASPECTS 6 or less, poor collaterals, and CBV-ASPECTS 6 or less (AUC, 0.87) was greater than that for any single parameter alone: CTA-SI-ASPECTS 6 or less (AUC, 0.80; P < 0.001), poor collaterals (AUC, 0.76; P < 0.001), and CBV-ASPECTS 6 or less (AUC, 0.81; P = 0.002). CONCLUSIONS The combination of CTA-SI-ASPECTS, collaterals, and CBV-ASPECTS may improve predictive power compared with a single parameter alone.
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Zhang J, Xia C, Liu Y, Qian W, Peng W, Liu K, Li L, Zhao F, Li Z. Comparative study of MR mTI-ASL and DSC-PWI in evaluating cerebral hemodynamics of patients with Moyamoya disease. Medicine (Baltimore) 2018; 97:e12768. [PMID: 30313089 PMCID: PMC6203517 DOI: 10.1097/md.0000000000012768] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The aim of this study was to explore the correlation between multi-inversion time arterial spin labeling (mTI-ASL) and dynamic susceptibility contrast-enhanced perfusion weighted imaging (DSC-PWI) in assessment of hemodynamics of patients with Moyamoya disease (MMD).In this study, 24 MMD patients and 21 healthy subjects were enrolled between June 2017 and December 2017. The images of mTI-ASL and DSC-PWI in the week before revascularization surgery were retrospectively analyzed. The parameters of cerebral blood flow (CBF), time to peak (TTP), and bolus arrival time (BAT) were measured in regions of interest (ROIs) of lateral middle cerebral artery (MCA) territories, basal ganglia (BG), and cerebellum, and relative perfusion parameters (rCBF-ASL, rBAT-ASL, rCBF-DSC, and rTTP-DSC) were calculated by dividing by cerebellum value. One-way analysis of variance and Student-Newman-Keuls tests were performed to compare rCBF-ASL and rCBF-DSC in the MMD group and the control group. Unpaired t test was used to compare rBAT-ASL and rTTP-DSC in the MMD group and the control group. And we assessed the correlation between rCBF-ASL and rCBF-DSC and between rBAT-ASL and rTTP-DSC using Pearson correlation analysis.All the relative parameters were significantly different between the MMD group and the control group (all P<.05). Meanwhile, there was significant difference between rCBF-ASL and rCBF-DSC (P<.05), and there was strong correlation between rCBF-ASL and rCBF-DSC (r = 0.839, P<.001), and moderate correlation between rBAT-ASL and rTTP-DSC (r = 0.519, P<.001).Both mTI-ASL and DSC-PWI could be used to assess perfusion state in MMD patients before revascularization surgery effectively. As a noninvasive imaging technique, mTI-ASL could provide perfusion parameters without contrast medium injection, and the results were quite correlative with DSC-PWI.
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Affiliation(s)
| | | | - Yi Liu
- Department of Neurosurgery, Sichuan University West China Hospital, Chengdu City, China
| | - Weiqiang Qian
- Department of Neurosurgery, Sichuan University West China Hospital, Chengdu City, China
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Messaris GAT, Georgakopoulos DN, Zampakis P, Kalogeropoulou CP, Petsas TG, Panayiotakis GS. Patient dose in brain perfusion imaging using an 80-slice CT system. J Neuroradiol 2018; 46:243-247. [PMID: 30030061 DOI: 10.1016/j.neurad.2018.06.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 06/04/2018] [Accepted: 06/23/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND PURPOSE Brain CT Perfusion (CTP) is an X-ray imaging technique for the assessment of brain tissue perfusion, which can be used in several different entities. The aim of this study is the evaluation of the radiation dose to patients during a comprehensive brain CT prescription protocol (CPP) consisting of an unenhanced brain CT, a brain CT angiography and a CTP scan. MATERIALS AND METHODS Eighteen patients were studied using an 80-slice CT system, with an iterative reconstruction algorithm. The volume Computed Tomography Dose Index (CTDIvol) and dose length product (DLP) were recorded from the dose report of the system. The calculation of effective dose (ED) was accomplished using the DLP values. RESULTS For the CTP examinations, the CTDIvol ranged from 116.0 to 134.8mGy, with the mean value 119.5mGy. The DLP ranged from 463.9 to 539.2mGy·cm, with the mean value 478mGy·cm. For the CPP, the total ED ranged from 3.31 to 5.07mSv, with the mean value 4.37mSv. CONCLUSIONS These values are lower than the values reported in corresponding studies, including studies utilizing CT systems with more slices.
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Affiliation(s)
- Gerasimos A T Messaris
- Department of Medical Physics, School of Medicine, University of Patras, 26504 Patras, Greece
| | | | - Petros Zampakis
- Department of Radiology, School of Medicine, University of Patras, 26504 Patras, Greece
| | | | - Theodoros G Petsas
- Department of Radiology, School of Medicine, University of Patras, 26504 Patras, Greece
| | - George S Panayiotakis
- Department of Medical Physics, School of Medicine, University of Patras, 26504 Patras, Greece.
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10
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Radiation dose reduction in perfusion CT imaging of the brain using a 256-slice CT: 80 mAs versus 160 mAs. Clin Imaging 2018; 50:188-193. [DOI: 10.1016/j.clinimag.2018.03.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 03/12/2018] [Accepted: 03/29/2018] [Indexed: 11/21/2022]
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11
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Sun H, Li W, Ma J, Liu Y, You C. CT perfusion diagnoses delayed cerebral ischemia in the early stage of the time-window after aneurysmal subarachnoid hemorrhage. J Neuroradiol 2017; 44:313-318. [PMID: 28237366 DOI: 10.1016/j.neurad.2016.12.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 11/21/2016] [Accepted: 12/30/2016] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND PURPOSE It has been acknowledged that delayed cerebral ischemia (DCI) after aneurysmal subarachnoid hemorrhage (SAH) can be diagnosed by CT perfusion (CTP) in the DCI time-window. We evaluated the diagnostic accuracy of CTP for DCI during the early stage of the time-window. MATERIALS AND METHODS We prospectively enrolled patients with aneurysmal SAH. DCI was defined as both new cerebral infarction and clinical deterioration after SAH. CTP was performed by using a standardized protocol with predefined regions of interest in 4 to 6 days after SAH. We quantitatively evaluated the diagnostic accuracy of eight CTP parameters (4 for absolute parameters and 4 for relative parameters). The receiver operator characteristic (ROC) curves of all parameters were generated and the optimal threshold values were derived for the calculation of sensitivities and specificities. RESULTS Fifty-three patients were enrolled and 20 patients were diagnosed with DCI. In the analysis of absolute CTP parameters, CBF and MTT had areas under the curve (AUC) >0.75 and the optimal threshold value was 40.4mL/100g/min and 3.78seconds, respectively. Through the evaluation of relative CTP parameters, all 4 parameters had AUC >0.75 and the optimal threshold value was 0.9 for CBV ratio, 0.85 for CBF ratio, 0.32seconds for MTT difference and 1.31seconds for TTP difference. CONCLUSIONS Besides two absolute CTP parameters (CBV and TTP), all six CTP parameters can be used as good diagnostic tests for DCI in the early stage of the time-window.
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Affiliation(s)
- Haogeng Sun
- Department of Neurosurgery, West China Hospital of Sichuan University, 37, Guoxuexiang Street, Chengdu 610041, China
| | - Wanjiang Li
- Department of Radiology, West China Hospital of Sichuan University, 37, Guoxuexiang Street, Chengdu 610041, China
| | - Junpeng Ma
- Department of Neurosurgery, West China Hospital of Sichuan University, 37, Guoxuexiang Street, Chengdu 610041, China
| | - Yi Liu
- Department of Neurosurgery, West China Hospital of Sichuan University, 37, Guoxuexiang Street, Chengdu 610041, China.
| | - Chao You
- Department of Neurosurgery, West China Hospital of Sichuan University, 37, Guoxuexiang Street, Chengdu 610041, China
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12
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Midgley SM, Stella DL, Campbell BCV, Langenberg F, Einsiedel PF. CT brain perfusion: A static phantom study of contrast-to-noise ratio and radiation dose. J Med Imaging Radiat Oncol 2016; 61:361-366. [DOI: 10.1111/1754-9485.12561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 10/26/2016] [Indexed: 11/27/2022]
Affiliation(s)
- Stewart M Midgley
- Department of Radiology; Royal Melbourne Hospital and University of Melbourne; Parkville Victoria Australia
- South Australian Medical Imaging; Flinders Medical Centre; Bedford Park South Australia Australia
- School of Physics and Astronomy; Monash University; Clayton Victoria Australia
| | - Damien L Stella
- Department of Radiology; Royal Melbourne Hospital and University of Melbourne; Parkville Victoria Australia
| | - Bruce CV Campbell
- Department of Medicine and Neurology; Royal Melbourne Hospital and University of Melbourne; Parkville Victoria Australia
| | - Francesca Langenberg
- Department of Radiology; Royal Melbourne Hospital and University of Melbourne; Parkville Victoria Australia
| | - Paul F Einsiedel
- Department of Radiology; Royal Melbourne Hospital and University of Melbourne; Parkville Victoria Australia
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Nishii T, Kono AK, Tani W, Suehiro E, Negi N, Takahashi S, Sugimura K. Four-dimensional noise reduction using the time series of medical computed tomography datasets with short interval times: a static-phantom study. PeerJ 2016; 4:e1680. [PMID: 26893966 PMCID: PMC4756736 DOI: 10.7717/peerj.1680] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Accepted: 01/21/2016] [Indexed: 12/04/2022] Open
Abstract
Backgrounds. This study examines the hypothesis that four-dimensional noise reduction (4DNR) with short interval times reduces noise in cardiac computed tomography (CCT) using “padding” phases. Furthermore, the capability of reducing the reduction dose in CCT using this post-processing technique was assessed. Methods. Using base and quarter radiation doses for CCT (456 and 114 mAs/rot with 120 kVp), a static phantom was scanned ten times with retrospective electrocardiogram gating, and 4DNR with short interval times (50 ms) was performed using a post-processing technique. Differences in the computed tomography (CT) attenuation, contrast-to-noise ratio (CNR) and spatial resolution with modulation transfer function in each dose image obtained with and without 4DNR were assessed by conducting a Tukey–Kramer’s test and non-inferiority test. Results. For the base dose, by using 4DNR, the CNR was improved from 1.18 ± 0.15 to 2.08 ± 0.20 (P = 0.001), while the CT attenuation and spatial resolution of the image of 4DNR did not were significantly inferior to those of reference image (P < 0.001). CNRs of the quarter-dose image in 4DNR also improved to 1.28 ± 0.11, and were not inferior to those of the non-4DNR images of the base dose (P < 0.001). Conclusions. 4DNR with short interval times significantly reduced noise. Furthermore, applying this method to CCT would have the potential of reducing the radiation dose by 75%, while maintaining a similar image noise level.
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Affiliation(s)
- Tatsuya Nishii
- Department of Radiology, Kobe University Graduate School of Medicine , Kobe , Japan
| | - Atsushi K Kono
- Department of Radiology, Kobe University Graduate School of Medicine , Kobe , Japan
| | - Wakiko Tani
- Division of Radiology, Center for Radiology and Radiation Oncology, Kobe University Hospital , Kobe , Japan
| | - Erina Suehiro
- Division of Radiology, Center for Radiology and Radiation Oncology, Kobe University Hospital , Kobe , Japan
| | - Noriyuki Negi
- Division of Radiology, Center for Radiology and Radiation Oncology, Kobe University Hospital , Kobe , Japan
| | - Satoru Takahashi
- Department of Radiology, Kobe University Graduate School of Medicine , Kobe , Japan
| | - Kazuro Sugimura
- Department of Radiology, Kobe University Graduate School of Medicine , Kobe , Japan
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Image quality, radiation dose and diagnostic accuracy of 70 kVp whole brain volumetric CT perfusion imaging: a preliminary study. Eur Radiol 2016; 26:4184-4193. [DOI: 10.1007/s00330-016-4225-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/02/2016] [Accepted: 01/15/2016] [Indexed: 11/30/2022]
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Radiation dose reduction in perfusion CT imaging of the brain: A review of the literature. J Neuroradiol 2016; 43:1-5. [DOI: 10.1016/j.neurad.2015.06.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 06/04/2015] [Accepted: 06/10/2015] [Indexed: 11/30/2022]
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16
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Othman AE, Afat S, Brockmann C, Nikoubashman O, Bier G, Brockmann MA, Nikolaou K, Tai JH, Yang ZP, Kim JH, Wiesmann M. Low-Dose Volume-Perfusion CT of the Brain: Effects of Radiation Dose Reduction on Performance of Perfusion CT Algorithms. Clin Neuroradiol 2015; 27:311-318. [PMID: 26669592 DOI: 10.1007/s00062-015-0489-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/30/2015] [Indexed: 10/22/2022]
Abstract
PURPOSE We aimed to compare different computed tomography (CT) perfusion post-processing algorithms regarding image quality of perfusion maps from low-dose volume perfusion CT (VPCT) and their diagnostic performance regarding the detection of ischemic brain lesions. METHODS AND MATERIALS We included VPCT data of 21 patients with acute stroke (onset < 6h), which were acquired at 80 kV and 180 mAs. Low-dose VPCT datasets with 72 mAs (40 % of original dose) were generated using realistic low-dose simulation. Perfusion maps (cerebral blood volume (CBV); cerebral blood flow (CBF) from original and low-dose datasets were generated using two different commercially available post-processing methods: deconvolution-based method (DC) and maximum slope algorithm (MS). The resulting DC and MS perfusion maps were compared regarding perfusion values, signal-to-noise ratio (SNR) as well as image quality and diagnostic accuracy as rated by two blinded neuroradiologists. RESULTS Quantitative perfusion parameters highly correlated for both algorithms and both dose levels (r ≥ 0.613, p < 0.001). Regarding SNR levels and image quality of the CBV maps, no significant differences between DC and MS were found (p ≥ 0.683). Low-dose MS CBF maps yielded significantly higher SNR levels (p < 0.001) and quality scores (p = 0.014) than those of DC. Low-dose CBF and CBV maps from both DC and MS yielded high sensitivity and specificity for the detection of ischemic lesions (sensitivity ≥ 0.82, specificity ≥ 0.90). CONCLUSION Our results indicate that both methods produce diagnostically sufficient perfusion maps from simulated low-dose VPCT. However, MS produced CBF maps with significantly higher image quality and SNR than DC, indicating that MS might be more suitable for low-dose VPCT imaging.
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Affiliation(s)
- A E Othman
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany.,Department for Diagnostic and Interventional Radiology, Eberhard Karls University Tuebingen, University Hospital Tuebingen, 72076, Tübingen, Germany
| | - S Afat
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - C Brockmann
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - O Nikoubashman
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - G Bier
- Department for Diagnostic and Interventional Radiology, Eberhard Karls University Tuebingen, University Hospital Tuebingen, 72076, Tübingen, Germany
| | - M A Brockmann
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - K Nikolaou
- Department for Diagnostic and Interventional Radiology, Eberhard Karls University Tuebingen, University Hospital Tuebingen, 72076, Tübingen, Germany
| | - J H Tai
- Center for Medical-IT Convergence Technology Research, Advanced Institute of Convergence Technology, 433-270, Suwon, South Korea
| | - Z P Yang
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, 433-270, Suwon, South Korea
| | - J H Kim
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, 433-270, Suwon, South Korea. .,Department of Radiology, Seoul National University College of Medicine, 101 Daehak-Ro, Chongno-gu, 110-744, Seoul, South Korea. .,Center for Medical-IT Convergence Technology Research, Advanced Institute of Convergence Technology, 433-270, Suwon, South Korea.
| | - M Wiesmann
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
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Comparison of Imaging Selection Criteria for Intra-Arterial Thrombectomy in Acute Ischemic Stroke with Advanced CT. Eur Radiol 2015; 26:2974-81. [DOI: 10.1007/s00330-015-4141-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 10/30/2015] [Accepted: 11/24/2015] [Indexed: 10/22/2022]
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18
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Wang J, Ni D, Bu W, Zhou Q, Fan W, Wu Y, Liu Y, Yin L, Cui Z, Zhang X, Zhang H, Yao Z. BaHoF 5 nanoprobes as high-performance contrast agents for multi-modal CT imaging of ischemic stroke. Biomaterials 2015; 71:110-118. [DOI: 10.1016/j.biomaterials.2015.08.038] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Revised: 08/17/2015] [Accepted: 08/18/2015] [Indexed: 01/10/2023]
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19
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Bricout N, Estrade L, Boustia F, Kalsoum E, Pruvo JP, Leclerc X. Reduced-dose CT protocol for the assessment of cerebral vasospasm. Neuroradiology 2015; 57:1211-8. [PMID: 26315026 DOI: 10.1007/s00234-015-1585-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 08/19/2015] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Despite the increased radiation dose, multimodal CT including noncontrast CT (NCT), CT angiography (CTA), and perfusion CT (PCT) remains a useful tool for the diagnosis of delayed cerebral ischemia (DCI) after aneurysmal subarachnoid hemorrhage (aSAH). The aim of this study was to assess the radiation dose and the image quality between a standard-dose and a reduced-dose multimodal CT protocol. METHODS The study group consisted of 26 aSAH patients with a suspicion of DCI on clinical examination and transcranial doppler. Two different CT protocols were used: a standard-dose protocol (NCT 120 kV, 350 mAs; CTA 100 kV, 250 mAs; PCT 80 kV, 200 mAs) from August 2011 to October 2013 (n = 13) and a reduced-dose protocol (NCT 100 kV, 400 mAs; CTA 100 kV, 220 mAs; PCT 80 kV, 180 mAs) from November 2013 to May 2014 (n = 13). Dose-length product (DLP), effective dose, volume CT dose index (CTDI), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and overall image quality were determined for each examination. RESULTS The overall image quality was judged as good or excellent in all cases. The reduced-dose protocol allowed a 15 % decrease in both the median total DLP (2438 vs 2898 mGy cm, p < 0.0001) and the effective dose as well as a significant decrease in median CTDI of 23, 31, and 10 % for NCT, CTA, and CTP, respectively. This dose reduction did not result in significant alteration of SNR (except for NCT) or CNR between groups. CONCLUSION The present study showed that the reduced-dose multimodal CT protocol enabled a significant reduction of radiation dose without image quality impairment.
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Affiliation(s)
- N Bricout
- Department of Neuroradiology, Université Lille Nord de France, Hôpital Roger Salengro, CHRU de Lille, Avenue Emile-Laine, 59037, Lille cedex, France.
| | - L Estrade
- Department of Neuroradiology, Université Lille Nord de France, Hôpital Roger Salengro, CHRU de Lille, Avenue Emile-Laine, 59037, Lille cedex, France
| | - F Boustia
- Department of Neuroradiology, Université Lille Nord de France, Hôpital Roger Salengro, CHRU de Lille, Avenue Emile-Laine, 59037, Lille cedex, France
| | - E Kalsoum
- Department of Neuroradiology, Université Lille Nord de France, Hôpital Roger Salengro, CHRU de Lille, Avenue Emile-Laine, 59037, Lille cedex, France
| | - J P Pruvo
- Department of Neuroradiology, Université Lille Nord de France, Hôpital Roger Salengro, CHRU de Lille, Avenue Emile-Laine, 59037, Lille cedex, France
| | - X Leclerc
- Department of Neuroradiology, Université Lille Nord de France, Hôpital Roger Salengro, CHRU de Lille, Avenue Emile-Laine, 59037, Lille cedex, France
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Impact of image denoising on image quality, quantitative parameters and sensitivity of ultra-low-dose volume perfusion CT imaging. Eur Radiol 2015; 26:167-74. [DOI: 10.1007/s00330-015-3853-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 04/20/2015] [Accepted: 05/13/2015] [Indexed: 10/23/2022]
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21
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Othman AE, Brockmann C, Yang Z, Kim C, Afat S, Pjontek R, Nikoubashman O, Brockmann MA, Kim JH, Wiesmann M. Effects of radiation dose reduction in Volume Perfusion CT imaging of acute ischemic stroke. Eur Radiol 2015; 25:3415-22. [PMID: 25903716 DOI: 10.1007/s00330-015-3763-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 03/11/2015] [Accepted: 04/01/2015] [Indexed: 11/25/2022]
Abstract
PURPOSE To examine the influence of radiation dose reduction on image quality and sensitivity of Volume Perfusion CT (VPCT) maps regarding the detection of ischemic brain lesions. METHODS AND MATERIALS VPCT data of 20 patients with suspected ischemic stroke acquired at 80 kV and 180 mAs were included. Using realistic reduced-dose simulation, low-dose VPCT datasets with 144 mAs, 108 mAs, 72 mAs and 36 mAs (80 %, 60 %, 40 % and 20 % of the original levels) were generated, resulting in a total of 100 datasets. Perfusion maps were created and signal-to-noise-ratio (SNR) measurements were performed. Qualitative analyses were conducted by two blinded readers, who also assessed the presence/absence of ischemic lesions and scored CBV and CBF maps using a modified ASPECTS-score. RESULTS SNR of all low-dose datasets were significantly lower than those of the original datasets (p < .05). All datasets down to 72 mAs (40 %) yielded sufficient image quality and high sensitivity with excellent inter-observer-agreements, whereas 36 mAs datasets (20 %) yielded poor image quality in 15 % of the cases with lower sensitivity and inter-observer-agreements. CONCLUSION Low-dose VPCT using decreased tube currents down to 72 mAs (40 % of original radiation dose) produces sufficient perfusion maps for the detection of ischemic brain lesions. KEY POINTS • Perfusion CT is highly accurate for the detection of ischemic brain lesions • Perfusion CT results in high radiation exposure, therefore low-dose protocols are required • Reduction of tube current down to 72 mAs produces sufficient perfusion maps.
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Affiliation(s)
- Ahmed E Othman
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany.
- Department for Diagnostic and Interventional Radiology, Eberhard Karls University Tuebingen, University Hospital Tuebingen, Hoppe-Seyler-Straße 3, 72076, Tübingen, Germany.
| | - Carolin Brockmann
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - Zepa Yang
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Suwon, 433-270, South Korea
- Department of Radiology, Seoul National University College of Medicine, Seoul, 110-744, South Korea
| | - Changwon Kim
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Suwon, 433-270, South Korea
- Department of Radiology, Seoul National University College of Medicine, Seoul, 110-744, South Korea
| | - Saif Afat
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - Rastislav Pjontek
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - Omid Nikoubashman
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - Marc A Brockmann
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
| | - Jong Hyo Kim
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Suwon, 433-270, South Korea
- Department of Radiology, Seoul National University College of Medicine, Seoul, 110-744, South Korea
- Center for Medical-IT Convergence Technology Research, Advanced Institute of Convergence Technology, Suwon, 433-270, South Korea
| | - Martin Wiesmann
- Department of Diagnostic and Interventional Neuroradiology, RWTH Aachen University, 52074, Aachen, Germany
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Tan Z, Miao Q, Li X, Ren K, Zhao Y, Zhao L, Li X, Liu Y, Chai R, Xu K. The primary study of low-dose pancreas perfusion by 640- slice helical CT: a whole-organ perfusion. SPRINGERPLUS 2015; 4:192. [PMID: 25932375 PMCID: PMC4409948 DOI: 10.1186/s40064-015-0950-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 03/27/2015] [Indexed: 01/06/2023]
Abstract
To discuss the feasibility of low-dose whole-pancreas imaging utilizing 640-slice dynamic volume CT.80 patients (40 cases of normal pancreas and 40 patients supposed of having pancreatic carcinoma or focal pancreatic space-occupying lesions were mainly refered) referred for CT pancreas perfusion were enrolled in the study. 80 patients randomly assigned to 3 groups: Group ① (whole sequence). Group ② (odd number sequence). Group ③ (even number group)(Compared to ①, the scanning times and effective radiate dose of ② and ③ decreased about 50% respectively). The head, body, tail of each normal pancreas without any pancreatic disease, lesion and lesion-surrounding areas of each pancreatic cancer were selected as ROI, and tissue peak, blood flow are measured.According to pathology and clinical materials, 27 patients were diagnosed as pancreatic cancer; 40 patients were diagnosed as normal pancreas. The tissue peak and blood flow of the head, body, tail of normal pancreas without any pancreatic disease are 109.63 ± 16.60 and 131.90 ± 41.61, 104.38 ± 19.39 and 127.78 ± 42.52, 104.55 ± 15. 44 and 123.50 ± 33.44 respectively. The tissue peak and blood flow of pancreatic cancer is 59.59 ± 18.20 and 60.00 ± 15.36. For and between each group, there is no significant statistical difference for the tissue peak and blood flow of normal areas of the head, body, tail of normal pancreas. There is statistical difference for the tissue peak and blood flow of lesion and lesion-surrounding areas of pancreatic cancer in each group. However, there is no statistical difference for the tissue peak and blood flow of normal and diseasing areas between 3 groups.Low-dose whole-pancreas perfusion with 640-slice dynamic volume CT is feasible.
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Affiliation(s)
- Zhengwu Tan
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Qi Miao
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Xiaoling Li
- />Department of Radiology, The first affiliated hospital, Heilongjiang University of Chinese Medicine, Haibin, Heilongjiang Zip code:150040 PR China
| | - Ke Ren
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Yu Zhao
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Li Zhao
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Xuedan Li
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Yi Liu
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Ruimei Chai
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
| | - Ke Xu
- />Department of Radiology, The first affiliated hospital, China Medical University, Shenyang, Liaoning Zip code:110001 PR China
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The value of cerebral CT angiography with low tube voltage in detection of intracranial aneurysms. BIOMED RESEARCH INTERNATIONAL 2015; 2015:876796. [PMID: 25710034 PMCID: PMC4331409 DOI: 10.1155/2015/876796] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 12/09/2014] [Accepted: 12/09/2014] [Indexed: 11/18/2022]
Abstract
Objective. The aim of this study is to investigate the value of cerebral CT angiography (CTA) with low tube voltage in detection of intracranial aneurysms. Materials and Methods. A total of 294 consecutive patients with spontaneous subarachnoid hemorrhage (SAH) were enrolled in this study and randomly assigned into conventional voltage CTA (C-CTA) group and low voltage CTA (L-CTA) group. The objective and subjective image qualities were analyzed and compared between C-CTA and L-CTA groups. With the results of 3D-DSA as “gold standard,” the sensitivity, specificity, and accuracy of C-CTA and L-CTA in diagnosis of aneurysms were calculated and compared with each other. Results. Compared with group C-CTA, the CT dose index volume (CTDIvol) of group L-CTA reduced by 35.65%. There were no significant differences between C-CTA and L-CTA groups regarding objective and subjective image qualities. The sensitivity, specificity, and accuracy of L-CTA in diagnosis of aneurysms were 95.16%, 99.72%, and 99.42%, respectively. There were no significant differences in sensitivity, specificity, and accuracy between the C-CTA and L-CTA groups. Conclusion. The value of cerebral CTA with 100 kV low tube voltage in detection of intracranial aneurysms is significant, and it should be recommended as a routine scan method.
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Chen GZ, Zhang LJ, Schoepf UJ, Wichmann JL, Milliken CM, Zhou CS, Qi L, Luo S, Lu GM. Radiation dose and image quality of 70 kVp cerebral CT angiography with optimized sinogram-affirmed iterative reconstruction: comparison with 120 kVp cerebral CT angiography. Eur Radiol 2015; 25:1453-63. [PMID: 25636415 DOI: 10.1007/s00330-014-3533-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/15/2014] [Accepted: 11/20/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To evaluate radiation dose, image quality, and optimal level of sinogram-affirmed iterative reconstruction (SAFIRE) of cerebral CT angiography (CTA) at 70 kVp. METHODS One hundred patients were prospectively classified into two groups: Group A (n = 50), 70 kVp cerebral CTA with 5 levels of SAFIRE reconstruction (S1-S5); and Group B (n = 50), 120 kVp with filtered back projection (FBP) reconstruction. CT attenuation values, noise, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the internal carotid artery (ICA) and middle cerebral artery (MCA) were measured. Subjective image quality was evaluated. Effective dose (ED) was estimated. RESULTS CT attenuation and noise of the ICA and MCA in Group A were higher than those of Group B (all P < 0.001) while the SNRICA, SNRMCA, CNRICA, and CNRMCA of Group A at S4-5 were comparable to (P > 0.05) or higher than in Group B (P < 0.05). There was no difference in overall image quality between Group A S3-5 and Group B (P > 0.05). ED was 0.2 ± 0.0 mSv for Group A with 85 % ED reduction in comparison to Group B (1.3 ± 0.2 mSv). CONCLUSION Cerebral CTA at 70 kVp is feasible, allowing for substantial radiation dose reduction. SAFIRE S4 level is recommended for obtaining optimal image quality. KEY POINTS • 70 kVp cerebral CTA is feasible and provides diagnostic image quality. • 70 kVp cerebral CTA resulted in 85% effective dose reduction. • S4 level of SAFIRE is recommended for 70 kVp cerebral CTA.
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Affiliation(s)
- Guo Zhong Chen
- Department of Medical Imaging, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu, 210002, China
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