Cohen Mervyn D
Department of Radiology, Riley Hospital for Children, Indiana University School of Medicine, 702 Barnhill Drive, Indianapolis, IN 46202, USA.
AJR Am J Roentgenol. 2009 May;192(5):1292-303. doi: 10.2214/AJR.08.2174.
There is a known risk from radiation. The objective of this article is to answer the following question regarding CT: Is there a risk of lowering the radiation exposure so low that the risk of missing a diagnosis from excessive noise in the image begins to exceed the risk of the radiation itself?
When performing CT, adequate radiation dose must be used to make a confident and accurate diagnosis. The total population radiation exposure can be reduced effectively by numerous other means, including aggressively reducing the number of CT examinations performed for poor clinical indications, scanning only the anatomic region of interest, and not performing both unenhanced and contrast-enhanced scanning unless absolutely necessary.
辐射存在已知风险。本文的目的是回答关于CT的以下问题：是否存在将辐射暴露降低到如此低的水平，以至于因图像中过多噪声而漏诊的风险开始超过辐射本身的风险？
进行CT检查时，必须使用足够的辐射剂量以做出可靠且准确的诊断。通过许多其他方法可以有效降低总体人群的辐射暴露，包括积极减少因临床指征不佳而进行的CT检查数量、仅扫描感兴趣的解剖区域，以及除非绝对必要，否则不进行平扫和增强扫描。
