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目的检测电子计算机断层扫描(computed tomography,CT)设备主要性能指标,了解CT机工作性能状态,确保CT正常工作和诊断结果的准确性。方法应用Catphan500 CT性能测试体模对5台CT机主要性能指标进行检测,如噪声、低对比度分辨率、均匀性、层厚、空间分辨率等。结果首次检测除噪声外合格率为80%外,其余指标均达到标准要求,经工程师对CT机调试后各项指标检测合格率达到了100%。结论通过对噪声、低对比度分辨率、均匀性等性能指标的检测,可客观获取CT机的工作状态。定期对CT机进行质量检测,质控操作规范化,指标检测个体化,可更好地满足正常的医疗工作。
Objective To detect the main performance indexes of computed tomography (CT) equipment, understand the performance status of CT machine, and ensure the correct operation of CT and the diagnostic accuracy. Methods The main performance indexes of 5 CT machines were tested with Catphan 500 CT performance test phantom, such as noise, low contrast resolution, uniformity, layer thickness, spatial resolution and so on. The results of the first test except for the noise pass rate of 80%, the remaining indicators have reached the standard requirements, the engineer on the CT machine after testing the indicators pass rate of 100%. Conclusion Through the detection of noise, low contrast resolution, uniformity and other performance indicators, we can objectively obtain the working status of the CT machine. CT on a regular basis for quality testing, quality control operations standardized, personalized testing indicators to better meet the normal medical work.