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Segmented TOF at 7 T MRI: Technique and clinical applications

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机构: [1]Chinese Acad Sci, State Key Lab Brain & Cognit Sci, Beijing MR Ctr Brain Res, Inst Biophys, Beijing 100101, Peoples R China; [2]Univ Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China; [3]Capital Med Univ, Dept Neurosurg, Beijing Tiantan Hosp, Beijing 100050, Peoples R China; [4]Siemens Shenzhen Magnet Resonance Ltd, Shenzhen 518057, Peoples R China; [5]Beijing Inst Brain Disorders, Beijing 100053, Peoples R China; [6]Chinese Acad Sci, State Key Lab Brain & Cognit Sci, Beijing MR Ctr Brain Res, Inst Biophys, Bldg 11,15 Datun Rd, Beijing 100101, Peoples R China
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关键词: Segmented TOF 7T Venous suppression SAR MR angiography

摘要:
Purpose: Time-of-flight (TOF) MR angiography has an advantage of contrast and resolution in ultra-high field (7 T) MRI systems. However, increased specific absorption rate (SAR) prohibits the application of spatial saturation band, leading to venous contamination in maximum intensity projection (MIP) images. Methods: A segmented k-space filling scheme with sparse venous saturation pulses was developed for 7 T TOF-MRA. The effectiveness of the segmented TOF sequence was verified by Bloch equation simulation and experiments on 3 T. The protocol on 7 T was optimized and applied for healthy volunteers and patients with vascular diseases. Results: Segmented TOF achieved equivalent contrast and venous suppression effect as conventional methods, while SAR values had a remarkable reduction and obeyed the limit of a 7 T MRI system. The decreased number of saturation pulses allowed shorter acquisition time than existing solutions. The comparison of segmented TOF and conventional TOF revealed flow direction in vascular diseases. Conclusion: Segmented TOF is proved to be a time-efficient way to achieve high-resolution angiograms without venous contamination at ultra-high field. The sequence holds strong promise for non-contrast clinical diagnosis on cerebrovascular diseases. (C) 2015 Elsevier Inc. All rights reserved.

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出版当年[2014]版:
大类 | 4 区 医学
小类 | 3 区 核医学
最新[2025]版:
大类 | 4 区 医学
小类 | 4 区 核医学
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出版当年[2013]版:
Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
最新[2024]版:
Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

影响因子: 最新[2024版] 最新五年平均 出版当年[2013版] 出版当年五年平均 出版前一年[2012版] 出版后一年[2014版]

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第一作者机构: [1]Chinese Acad Sci, State Key Lab Brain & Cognit Sci, Beijing MR Ctr Brain Res, Inst Biophys, Beijing 100101, Peoples R China; [2]Univ Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China;
通讯作者:
通讯机构: [1]Chinese Acad Sci, State Key Lab Brain & Cognit Sci, Beijing MR Ctr Brain Res, Inst Biophys, Beijing 100101, Peoples R China; [5]Beijing Inst Brain Disorders, Beijing 100053, Peoples R China; [6]Chinese Acad Sci, State Key Lab Brain & Cognit Sci, Beijing MR Ctr Brain Res, Inst Biophys, Bldg 11,15 Datun Rd, Beijing 100101, Peoples R China
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