PET/CT质量性能检测的探讨

Study of PET/CT quality performance test

目的:探讨PET/CT的应用质量和性能检测方法。方法:用放射性核素18F检测PET的空间分辨率、灵敏度、散射因子与计数丢失、图像质量,用美国Catphan-424性能体模和瑞典Barracuda长杆电离室和射线测量仪检测CT的剂量指数、定位光精度、层厚、空间分辨率、密度分辨率、场均匀性和噪声、CT值线性和对比度标度、检查床运动精度。结果:PET/CT作为整机合格,但部分参数不合格。结论:通过检测可有效保证系统的质量和安全。

Objective To probe into the application quality and performance test of PET/CT.Methods Radionuclide 18F was used to detect PET including its spatial resolution,sensitivity,scatter fraction,count losses and image quality.American Catphan-424,ionization chamber of Sweden Barracuda and radial measuring apparatus were used to perform CT test including CTDI,scan localization light accuracy,slice width,spatial resolution,density resolution,field uniformity and noise,CT value linearity and contrast scale,table movement accuracy.Results PET/CT was qualified as the whole,but part of parameters were beyond the limits.Conclusion The performance test can efficiently ensure the quality and safety of PET/CT system.