Techniques and parameters for estimating radiation exposure and dose in cardiac computed tomography
Techniques and parameters for estimating radiation exposure and dose in cardiac computed tomography
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DOI：
10.1007/s10554-004-5338-6
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发表时间：
2005-02-01
影响因子：
2.1
通讯作者：
Morin, RL
中科院分区：
文献类型：
--
作者：
Gerber, TC;Kuzo, RS;Morin, RL
随着心脏CT成像的临床应用越来越多，重要的是，所有推荐或实施此类检查的卫生保健提供者都熟悉CT辐射剂量学的概念和价值，以及辐射防护的基本原则。目前用于心脏和冠状动脉成像的CT扫描仪类型在辐射剂量方面存在重要的技术差异。由于这些差异，使用多排探测器CT （MDCT）进行心脏检查时的辐射剂量通常高于电子束CT。在CT检查过程中，有几种技术通过改变x射线管电流来降低多层螺旋CT成像的辐射剂量。体积计算机断层扫描剂量指数（CTDIvol）、剂量长度积（DLP）和有效剂量(E)是描述和比较心脏CT检查所受辐射剂量的最有用的参数。在比较不同扫描方式和扫描仪类型的辐射剂量时，必须考虑图像噪声的程度。诊断，而不是美学，图像质量应该是指导心脏CT成像扫描方案发展的最重要因素。心脏CT检查应仅由合格的卫生保健提供者安排，而安排检查的临床医生应意识到，他们有责任权衡辐射暴露的风险和预期的益处。
With increasing clinical use of cardiac CT imaging it is important that all health care providers referring for or administering such examinations are familiar with the concepts and values of radiation dosimetry in CT as well as with the basic principles of radiation protection. There are important technical differences pertinent to radiation dose between the CT scanner types that are currently being used for imaging of the heart and coronary arteries. As a result of these differences, the radiation dose typically is higher when a cardiac examination is performed with multidetector-row CT (MDCT) than when it is performed with electron beam CT. Several techniques have been described to reduce radiation dose of MDCT imaging by varying the X-ray tube current during a CT examination. The volume computed tomographic dose index (CTDIvol), the dose length product (DLP), and the effective dose (E) are the most useful parameters to describe and compare radiation doses received from cardiac CT examinations. When comparing radiation doses between scanning protocols and scanner types, the degree of image noise must be considered. Diagnostic, rather than aesthetic, quality of images should be the most important factor guiding the development of scanning protocols for cardiac CT imaging. Cardiac CT examinations should be ordered only by qualified health care providers, and the ordering clinicians should be aware of their responsibility of weighing risks of the radiation exposure against the expected benefits.