Radiation Dose from Single-Heartbeat Coronary CT Angiography Performed with a 320-Detector Row Volume Scanner
Radiation Dose from Single-Heartbeat Coronary CT Angiography Performed with a 320-Detector Row Volume Scanner
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DOI：
10.1148/radiol.09090779
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发表时间：
2010-03-01
期刊：
影响因子：
19.7
通讯作者：
Brenner, David J.
中科院分区：
文献类型：
--
作者：
Einstein, Andrew J.;Elliston, Carl D.;Brenner, David J.
目的：确定使用320排容积扫描仪进行冠状动脉计算机断层扫描（CT）血管造影的辐射剂量，并评估有效剂量如何取决于扫描模式和使用的计算方法。材料和方法：用金属氧化物-半导体场致电离辐射剂量计测定冠状动脉CT血管造影的辐射剂量。效应晶体管探测器位于物理上和放射学上模拟男性或女性人类的拟人化体模中。确定了六种扫描模式的器官和有效剂量，包括64行螺旋扫描和280行体积扫描。将有效剂量与基于临床文献中最常用方法的估计值进行比较：将剂量长度乘积（DLP）乘以一般转换系数（0.017或0.014 mSv）。mGy（-1）。cm（-1）），确定从蒙特卡罗模拟胸部CT通过使用单节扫描仪和以前的tissue-weighting factors.Results：有效剂量减少了高达91%，体积扫描相对于螺旋扫描，具有类似的图像噪声。使用国际放射防护委员会出版物103组织加权因子确定的有效剂量为8.2 mSv（使用允许宽重建窗口的容积扫描）、5.8 mSv（使用优化曝光）和4.4 mSv（使用优化100 kVp扫描）。估计有效剂量与胸部转换系数导致的剂量低至1.8 mSv，大大低估了有效剂量的体积和螺旋冠状动脉CT angiography.Conclusion：体积扫描显着降低冠状动脉CT血管造影辐射剂量相比，在螺旋扫描。当转换系数用于根据DLP估计有效剂量时，它们应适用于所使用的扫描仪和扫描模式，并反映当前的组织加权因子。(C)RSNA，2010年。
Purpose: To determine radiation doses from coronary computed tomographic (CT) angiography performed by using a 320-detector row volume scanner and evaluate how the effective dose depends on scan mode and the calculation method used.Materials and Methods: Radiation doses from coronary CT angiography performed by using a volume scanner were determined by using metaloxide-semiconductor field-effect transistor detectors positioned in an anthropomorphic phantom physically and radiographically simulating a male or female human. Organ and effective doses were determined for six scan modes, including both 64-row helical and 280-row volume scans. Effective doses were compared with estimates based on the method most commonly used in clinical literature: multiplying dose-length product (DLP) by a general conversion coefficient (0.017 or 0.014 mSv . mGy(-1) . cm(-1)), determined from Monte Carlo simulations of chest CT by using single-section scanners and previous tissue-weighting factors.Results: Effective dose was reduced by up to 91% with volume scanning relative to helical scanning, with similar image noise. Effective dose, determined by using International Commission on Radiological Protection publication 103 tissue-weighting factors, was 8.2 mSv, using volume scanning with exposure permitting a wide reconstruction window, 5.8 mSv with optimized exposure and 4.4 mSv for optimized 100-kVp scanning. Estimating effective dose with a chest conversion coefficient resulted in a dose as low as 1.8 mSv, substantially underestimating effective dose for both volume and helical coronary CT angiography.Conclusion: Volume scanning markedly decreases coronary CT angiography radiation doses compared with those at helical scanning. When conversion coefficients are used to estimate effective dose from DLP, they should be appropriate for the scanner and scan mode used and reflect current tissue-weighting factors. (C) RSNA, 2010.