CT的空间分辨力测量技术及测试体模研究

High-contrast resolution measurement of CT and phantom testing

目的采用主观法和客观法测试CT机的空间分辨力,探讨与空间分辨力相关的各项参数。方法采用Catphan500和自制体模对2台CT在不同条件下进行了测试。结果分别得出了线对法和MTF方法下的结果。结论每种测试方法各有优缺点,有多种因素影响CT空间分辨力。

The authors adopted subjective and objective methods for measuring high-contrast resolution (HCR) of CT and explored the parameters in relation to HCR. With Catphan500 and a self-prepared experimental phantom, the two CT sets were tested for HCR with varied slice thickness and kernels. The subjective assessment of the images was carried out by visual detection of HCR, and objective assessment was performed by calculations. Each of the methods has its advantages and limitations, and many factors may affect the HCR of CT.