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目的：探讨ＣＴ 机的性能检测方法。材料和方法：ＣＴ 设备２０ 台。性能检测参数为层厚、ＣＴ 值线性与对比度标度、均匀性、噪声、空间分辨力、密度分辨力、诊视床定位光精度、诊视床运动精度、剂量指数（ ＣＴＤＩ） 等九项。用Ｃａｔｐｈａｎ体模以及ＲＡＤＣＡＬ 剂量测试设备对ＣＴ 机进行性能参数检测。用近２ 个月多部位照片进行临床照片评估。结果：９ 台ＣＴ 机全部参数合格，其中有３ 台照片质量评估为１ 等，６ 台照片质量评估为２ 等，７ 台ＣＴ 机有１ 项参数不合格，照片质量评估为２ 等，４ 台ＣＴ 机有３ 项以上参数不合格，照片质量评估为２ 等。结论：该检测方法可对ＣＴ 机的各项参数作精确的检测，能够满足ＣＴ 机质量保证性能检测的要求。
Objective: To explore the performance testing method of CT machine. Materials and Methods: 20 sets of CT equipment. The performance parameters were linearity and contrast scale of CT value, uniformity, noise, spatial resolution, density resolution, diagnostic accuracy of bed positioning light, bed motion accuracy and dose index (CTDI). The performance parameters of CT machine were tested with Catphan phantom and RADCAL dose testing equipment. With nearly two months of multi-site photographs for clinical photo evaluation. Results: All the parameters of 9 CT machines were qualified, among which 3 were quality assessment of 1, 6 were of 2 quality evaluation, 7 CT machines had 1 parameter failure, photo quality assessment was 2, 4 CT machine has more than 3 parameters failed, photo quality assessment for 2 and so on. Conclusion: This method can accurately detect the parameters of CT machine and meet the requirements of CT machine quality assurance performance testing.