Effective doses in subjects undergoing computed tomography cardiac imaging with the 256-multislice CT scanner
Effective doses in subjects undergoing computed tomography cardiac imaging with the 256-multislice CT scanner
复制标题
DOI：
10.1016/j.ejrad.2007.05.001
复制
发表时间：
2008-03-01
影响因子：
3.3
通讯作者：
Endo, Masahiro
中科院分区：
文献类型：
--
作者：
Mori, Shinichiro;Nishizawa, Kanae;Endo, Masahiro
背景：256层螺旋CT（256MSCT）在单次旋转中获得128 mm覆盖范围的体积数据。该覆盖范围允许对整个心脏进行令人满意的可视化，允许256 MSCT通过电影扫描而无需ECG门控来可视化心腔和冠状动脉。这些特点为MSCT的问题提供了解决方案。目的：评价256层螺旋CT在心脏CT检查中的辐射暴露，并与16层和64层螺旋CT进行比较（使用256 MSCT准直64 x 0.5 mm）。在冠状动脉成像协议下，使用256 MSCT在电影扫描模式下（无ECG门控）在拟人化体模中测量器官或组织剂量，结果：16层螺旋CT、64层螺旋CT和256层螺旋CT的平均有效剂量分别为22.8mSv、27.8mSv和14.1mSv。16和64层螺旋CT的剂量分别是256层螺旋CT的1.6倍和2.0倍。结论：256层螺旋CT在心脏容积电影成像中的辐射暴露低于16和64层螺旋CT，表明该设备在无心电门控的单次心脏成像中的潜力。该有效剂量对于常规心脏成像是可接受的。(C)2007爱思唯尔爱尔兰有限公司保留所有权利。
Background: The 256-multislice CT (256MSCT) obtains volumetric data with 128-mm coverage in a single rotation. This coverage allows satisfactory visualization of the whole heart, allowing the 256MSCT to visualize the cardiac chambers and coronary arteries by cine scan without ECG gating. These characteristics provide a solution to the problems of MSCT. Although a wider beam width provides more efficient imaging over a wider coverage area, patient doses with the 256MSCT are of considerable concern.Objective: We assessed potential radiation exposure with the 256MSCT in a cardiac CT protocol and compared the results to those with 16- and 64MSCT (collimated 64 x 0.5 mm using 256MSCT).Methods: Organ or tissue doses were measured in an anthropomorphic phantom under a coronary artery imaging protocol with the 256MSCT in cine scan mode without ECG gating, and with the 16- and 64MSCT in helical scan mode with ECG gating.Results: Average effective doses were 22.8 mSv for the 16MSCT, 27.8 mSv for the 64MSCT and 14.1 mSv for the 256MSCT. The 16- and 64MSCT doses were thus approximately 1.6- and 2.0-fold higher than those of the 256MSCT.Conclusions: Use of the 256MSCT in cardiac volumetric cine imaging offers lower radiation exposure than 16- and 64MSCT, and suggests the potential of this equipment in single-beat cardiac imaging without ECG gating. This effective dose is acceptable for routine cardiac imaging. (C) 2007 Elsevier Ireland Ltd. All rights reserved.