Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.
Int J Cardiovasc Imaging. 2010 Feb;26 Suppl 1:17-25. doi: 10.1007/s10554-009-9576-5.
With the introduction of 64-slice CT and dual-source CT technology, coronary CT angiography(CCTA) has emerged as a useful diagnostic imaging modality for the noninvasive assessment of coronary heart disease. Recently, the risks associated with ionizing radiation on CT have raised serious concerns.The main concern of exposure to ionizing radiation is the potential risk of cancer. CCTA involves much higher radiation dose with the advances in the spatial and temporal resolution of cardiac CT. Currently,various dose-saving algorithms, such as ECG (electrocardiography)-based dose modulation, reduced tube voltage, and prospective ECG gating, high-pitch helical scanning are available to lower radiation exposure during cardiac CT. Therefore, careful selection of CT scanning protocols is needed to keep the radiation exposure 'as low as reasonably achievable (ALARA)'. In this review we will discuss the radiation dose safety issues, the measurement of radiation dose and current use of dose-saving techniques in CCTA.
随着 64 层 CT 和双源 CT 技术的引入，冠状动脉 CT 血管造影（CCTA）已成为一种有用的冠心病无创诊断成像方式。最近，CT 电离辐射带来的风险引起了人们的严重关注。暴露于电离辐射的主要担忧是潜在的癌症风险。随着心脏 CT 空间和时间分辨率的提高，CCTA 涉及更高的辐射剂量。目前，有多种剂量节省算法，如基于心电图（ECG）的剂量调制、降低管电压和前瞻性 ECG 门控、高螺旋扫描，可降低心脏 CT 期间的辐射暴露。因此，需要仔细选择 CT 扫描方案，以保持辐射暴露“尽可能低（ALARA）”。在本综述中，我们将讨论辐射剂量安全问题、辐射剂量的测量以及 CCTA 中目前使用的剂量节省技术。
