Sabarudin Akmal, Sun Zhonghua, Ng Kwan-Hoong
Discipline of Medical Imaging, Department of Imaging and Applied Physics, Curtin University, GPO Box, U1987, Perth, Western Australia 6845, Australia.
Radiat Prot Dosimetry. 2013;154(3):301-7. doi: 10.1093/rpd/ncs243. Epub 2012 Sep 12.
A retrospective analysis was performed in patients undergoing prospective ECG-triggered coronary computed tomography (CT) angiography (CCTA) with the single-source 64-slice CT (SSCT), dual-source 64-slice CT (DSCT), dual-source 128-slice CT and 320-slice CT with the aim of comparing the radiation dose associated with different CT generations. A total of 164 patients undergoing prospective ECG-triggered CCTA with different types of CT scanners were studied with the mean effective doses estimated at 6.8 ± 3.2, 4.2 ± 1.9, 4.1±0.6 and 3.8 ± 1.4 mSv corresponding to the 128-slice DSCT, 64-slice DSCT, 64-slice SSCT and 320-slice CT scanners. In this study a positive relationship was found between the effective dose and the body mass index (BMI). A low radiation dose is achieved in prospective ECG-triggered CCTA, regardless of the CT scanner generation. BMI is identified as the major factor that has a direct impact on the effective dose associated with prospective ECG-triggered CCTA.
对接受前瞻性心电图触发冠状动脉计算机断层扫描（CT）血管造影（CCTA）的患者进行了回顾性分析，这些患者使用单源64层CT（SSCT）、双源64层CT（DSCT）、双源128层CT和320层CT，目的是比较不同代CT相关的辐射剂量。共研究了164例接受不同类型CT扫描仪进行前瞻性心电图触发CCTA的患者，对应128层DSCT、64层DSCT、64层SSCT和320层CT扫描仪的平均有效剂量估计分别为6.8±3.2、4.2±1.9、4.1±0.6和3.8±1.4 mSv。在本研究中，发现有效剂量与体重指数（BMI）之间存在正相关关系。无论CT扫描仪的代次如何，前瞻性心电图触发CCTA均可实现低辐射剂量。BMI被确定为对与前瞻性心电图触发CCTA相关的有效剂量有直接影响的主要因素。
