Dilon 6800多晶体伽马相机质量控制方案研究与实践

Research and Practice of Quality Control Scheme of Dilon 6800 Pixelated Gamma Camera

目的 对Dilon 6800多晶体伽马相机进行系统均匀性测试,分析数据并探讨质控方案,提高图像质量,确保设备正常运行。方法 根据用户手册、美国国家电气制造商协会标准、美国医学物理学家学会报告、美国核医学会指南和生产厂商建议,测试并收集2016—2021年的每月系统均匀性数据,若其有效视野积分均匀性数值≥9.50%则加以校正。分析数据并根据每月平均湿度将其分为高低湿度组,比较2组有效视野均匀性均值的差异。结果 2016—2021年每月的有效视野积分均匀性的校正后最终值保持在10.00%以下,在可接受范围内。校正后均匀性显著优于校正前。高湿度组的有效视野均匀性原始值显著高于低湿度组。结论 通过总结Dilon 6800多晶体伽马相机的质控方案,并采用系统均匀性测试,评估得出观察有效视野积分均匀性比微分均匀性更有效。及时校正可恢复并保持设备的均匀性指标,且湿度与机器均匀性性能有关,因此应关注高湿度对设备的影响。

Objective To conduct extrinsic uniformity tests of Dilon 6800 pixelated gamma camera,analyze the data,and summarize the quality control procedure to ensure proper operation of the device and improve image quality.Methods According to the user manual,the standard of the National Electrical Manufacturers Association,American Association of Physicists in Medicine report,Society of Nuclear Medicine guideline,and the manufacturer's recommendations,the extrinsic uniformity of the pixelated gamma camera Dilon 6800 were tested from 2016 to 2021.It was corrected when the integration uniformity for the useful field of view was greater than or equal to 9.50%.According to the monthly average humidity of the examination room,it was divided into high and low humidity groups.The mean differences of integration uniformity and differential uniformity for the useful field of view between the two groups was compared.Results The final value of integration uniformity for the useful field of view each month from 2016 to 2021 was below 10.00%,which was within the acceptable range.The uniformity after correction was significantly better than before correction.The original values of integration uniformity and differential uniformity for useful field of view in the high humidity group were significantly higher than those in the low humidity group.Conclusion The uniformity control procedure of the Dilon 6800 pixelated gamma camera is summarized,and the extrinsic uniformity test is performed to evaluate the performance according to the integration uniformity for the useful field of view,which is more effective than differential uniformity.This indicates that calibration can restore and maintain the equipment's uniformity index.Additionally,humidity is related to the performance of equipment uniformity,so attention should be paid to the impact of high humidity on the equipment.