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本文介绍了目前国际上两种通用的ＣＴ受检者剂量的表示方法和检测方法。通常用多层扫描平均剂量（ＭＳＡＤ）或ＣＴ剂量指数（ＣＴＤＩ）来表示ＣＴ受检者的剂量；用ＣＴ标准电离室（笔形电离室）或热释光剂量计（ＴＬＤ）进行检测。通过实验和数学模拟方法，找出了ＭＳＡＤ与ＣＴＤＩ之间和不同方法检测结果之间的关系，为今后推广使用这两种检测方法进行ＣＴ受检者剂量监测和推广使用国际电离辐射防护与辐射源安全基本标准（ＩＢＳＳ）推荐的ＣＴ受检者剂量指导水平打下技术基础。
This article describes the current international two kinds of CT dose of the general method of expression and detection methods. The dose of the CT subject is usually indicated by the mean number of layers scanned (MSAD) or CT dose index (CTDI); detection is performed with a CT standard ionization chamber (pen ionization chamber) or a thermoluminescence dosimeter (TLD). Through the experimental and mathematical simulation methods, the relationship between MSAD and CTDI and the detection results of different methods was found out, so as to promote the use of these two detection methods in the future to monitor the dose of CT and promote the use of international ionizing radiation protection and radiation The Basis of Source Safety Basis (IBSS) recommended the CT subject dose guidance level to lay the technical foundation.