This paper designed an automatic evaluation software of MRI slice thickness based on the American Center of Radiology (ACR) phantom. By analyzing traditional measuring principles, the research identified a method for automatic evaluation. The results showed that slice thickness can be automatically evaluated by using MATLAB (matrix laboratory) image processing functions. The development of the software was a critical step in the process of realizing MRI automatic quality control and was of great signiifcance to the MRI automatic quality control system.%本文设计了基于ACR体模的磁共振层厚自动测量软件，通过分析传统测量的原理，找到了自动测量的方法。结果发现，利用MATLAB图像处理功能可实现层厚的自动测量。该软件的开发是实现磁共振图像质量控制自动评价软件的关键一步，对磁共振质量控制自动评价系统具有重要意义。
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