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CT的MTF是其分辨率特性定量客观的描述。本文介绍了MTF的意义和几种测量MTF的方法，并对直接测量方法和间接测量方法进行了实验和比较。MTF曲线是系统在空间频率域的传输特性、曲线上截止频率代表系统的极限分辨能力，是系统各个环节的复合贡献。
The MTF of CT is a quantitative and objective description of its resolution characteristics. This article introduces the meaning of MTF and several methods to measure MTF, and compares the direct measurement method and indirect measurement method. The MTF curve is the transmission characteristic of the system in the spatial frequency domain. The cutoff frequency on the curve represents the limit resolution capability of the system and is the composite contribution of all links in the system.