Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, P.O Box 10219, Riyadh, 11433, Saudi Arabia; Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, UK.
Prince Sattam Bin Abdulaziz University, College of Applied Medical Sciences, Radiology and Medical Imaging Department, P.O.Box 422, Alkharj, 11942, Saudi Arabia.
Appl Radiat Isot. 2021 Feb;168:109520. doi: 10.1016/j.apradiso.2020.109520. Epub 2020 Nov 19.
The various technological advancements in computed tomography (CT) have resulted in remarkable growth in the use of CT imaging in clinical practice, not the least of which has been its establishment as the most valuable imaging examination for the assessment of cardiovascular system disorders. The objective of this study was to assess the effective radiation dose and radiation risk for patients during cardiac CT procedures, based on studies from four different hospitals equipped with 128 slice CT equipment. A total of eighty-three patients were investigated in this study with different clinical indications. Effective doses were also calculated using software based on Monte Carlo simulation. The mean patient age (years), weight (kg), and body mass index (BMI (kg/m)) were 49 ± 11, 82 ± 12, and 31 ± 6, respectively. The results of the study revealed that the tube voltage (kVp) and tube current-exposure time product (mAs) ranged between 100 to 140 and 50 to 840 respectively. The overall average patient dose values for the volume CT dose index [(CTDI), in mGy)] and dose length product (DLP) (in mGy·cm) were 34.8 ± 15 (3.7-117.0) and 383.8 ± 354 (46.0-3277.0) respectively. The average effective dose (mSv) was 15.2 ± 8 (1.2-61.8). The radiation dose values showed wide variation between different hospitals and even within the same hospital. The results indicate the need to optimize radiation dose and to establish diagnostic reference levels (DRLs) for patients undergoing coronary computed tomography angiography (CCTA), also to harmonize the imaging protocols to ensure reduced radiation risk.
计算机断层扫描（CT）的各种技术进步使得 CT 成像在临床实践中的应用显著增加，其中最重要的是它已成为评估心血管系统疾病最有价值的影像学检查。本研究旨在评估基于配备 128 层 CT 设备的四家不同医院的研究，评估患者在心脏 CT 检查过程中的有效辐射剂量和辐射风险。这项研究共调查了 83 名具有不同临床指征的患者。有效剂量也使用基于蒙特卡罗模拟的软件进行计算。患者的平均年龄（岁）、体重（kg）和体重指数（BMI（kg/m ））分别为 49 ± 11、82 ± 12 和 31 ± 6。研究结果表明，管电压（kVp）和管电流-曝光时间乘积（mAs）分别在 100 到 140 之间和 50 到 840 之间变化。容积 CT 剂量指数 [(CTDI)，mGy)] 和剂量长度乘积 (DLP)（mGy·cm）的总体平均患者剂量值分别为 34.8 ± 15（3.7-117.0）和 383.8 ± 354（46.0-3277.0）。平均有效剂量（mSv）为 15.2 ± 8（1.2-61.8）。不同医院之间甚至同一医院内的辐射剂量值差异很大。结果表明，需要优化辐射剂量并为接受冠状动脉 CT 血管造影（CCTA）的患者建立诊断参考水平（DRLs），还需要协调成像方案以确保降低辐射风险。
