基于国家标准及美国电气制造商协会测量程序的PET/CT验收检测

Acceptance test of PET/CT based on national standard and the NEMA measurement program

目的:按照国家卫生行业标准WS817-2023要求对Biograph Vision 600型PET/CT进行验收测试与性能评估。方法:通过设备内置的美国电气制造商协会(NEMA NU2-2018)测量程序,根据国家卫生行业标准WS817-2023要求,检测PET/CT中PET部分的空间分辨力、灵敏度、散射分数、计数丢失与随机符合、计数丢失与随机符合校正准确性以及飞行时间(TOF)分辨力,并且通过设备内置的Gantry_offset采集程序测量PET/CT配准精度。结果:Biograph Vision 600型PET/CT横向、轴向空间分辨力在距离视野中心1 cm处分别为3.69、4.10 mm;在距离视野中心10 cm处分别为4.26、4.89 mm;在距离视野中心20 cm处分别为4.68、4.89 mm。视野中心和径向10 cm处灵敏度分别为16.12、16.00 kcps/MBq。噪声等效计数率(NECR)峰值为281.60 kcps,峰值对应的放射性活度浓度为30.69 kBq/ml,散射分数和相对计数率误差最大值分别为38.17%和4.0%。当放射性活度浓度为5.3 kBq/ml时,TOF分辨力为209.87 ps。Biograph Vision 600型PET/CT配准精度在x轴、y轴、z轴方向分别为0.347、-0.226、3.659 mm。结论:采用设备内置的NEMA NU2-2018标准测量程序,检测WS817-2023标准要求的检测项目可行;按照现行国家标准GB/T18988.1-2013和即将实施卫生行业标准WS817-2023要求,检测Biograph Vision 600型PET/CT的性能指标均满足标准要求,可通过验收。

Objective:To perform acceptance test and performance assessment for Siemens Biograph Vision 600 positron-emission tomography/computed tomography(PET/CT)according to the national health industry standard WS 817-2023.Methods:Spatial resolution,sensitivity,scatter fraction,count loss and random coincidence,correction accuracy of count loss and random coincidence,time-of-flight(TOF)resolution of the PET component within the PET/CT system were tested through the measurement program(NU2-2018)of National Electrical Manufacturers Association(NEMA),which was installed inside of the equipment,in accordance with the requirement of national health industry standard WS 817-2023.The PET/CT registration accuracy was measured through Gantry_offset acquisition program that was built into the equipment.Results:The transversely and axially spatial resolutions of Biograph Vision 600 PET/CT were respectively 3.69 mm and 4.10 mm at 1 cm away from the center of visual field,and were respectively 4.26 mm and 4.89 mm at 10 cm away from the center of visual field,and were respectively 4.68 mm and 4.89 mm at 20 cm away from the center of visual field.The sensitivity of 10 cm away from center and radial of visual field were respectively 16.12 kcps/MBq and 16.00 kcps/MBq.The peak value of noise equivalent count rate(NECR)was 281.60 kcps,and the corresponding radioactivity concentration of peak value was 30.69 kBq/ml.The NECR peak value,scatter fraction and maximum value of the error of relative count rate were respectively 38.17%and 4.0%.The TOF resolution was 209.87 ps when the radioactivity concentration was 5.3 kBq/mL.The registration accuracy values of Biograph Vision 600 PET/CT were 0.347 mm,-0.226 mm and 3.659 mm at the directions of x,y and z axis.Conclusion:It is feasible to perform the acceptance test according to the WS 817—2023 standard through uses the NEMA NU2-2018 standard measurement program that is installed inside of the equipment.The performance indicators can meet requirement of standard as the current national standard GB/T 18988.1—2013 and the health industry standard WS 817-2023 that will being implemented in the test of Biograph Vision 600 PET/CT,which can pass acceptance.