Long-term experience of MPC across multiple TrueBeam linacs: MPC concordance with conventional QC and sensitivity to real-world faults

Machine Performance Check (MPC) is an automated Quality Control (QC) tool that is integrated into the TrueBeam and Halcyon linear accelerators (Linacs), utilizing the imaging systems to verify the Linac beam and geometry. This work compares the concordance of daily MPC results with conventional QC tests over a 3-year period for eight Linacs in order to assess the sensitivity of MPC in detecting faults. The MPC output measurements were compared with the monthly ionization chamber measurements for 6 and 10 MV photon beams and 6, 9, 12, 16, and 18 MeV electron beams. All 6 MV Beam and Geometry (6MVBG) MPC test failures were analyzed to determine the failure rate and the number of true and false negative results, using the conventional QC record as the reference. The concordance between conventional QC test failures and MPC test failures was investigated. The mean agreement across 1933 MPC output and monthly comparison chamber measurements for all beam energies was 0.2%, with 97.8% within 1.5%, and a maximum difference of 2.9%. Of the 5000-6000 MPC individual test parameter results for the 6MVBG test, the highest failure rate was BeamOutputChange (0.5%), then BeamCenterShift (0.3%), and was

机器性能检查（MPC）是一种自动化的质量控制（QC）工具，它集成在TrueBeam和Halcyon直线加速器（Linacs）中，利用成像系统来验证直线加速器的射束和几何形状。本研究比较了8台直线加速器在3年期间每日MPC结果与常规QC测试的一致性，以评估MPC在检测故障方面的敏感性。将MPC输出测量值与6和10 MV光子束以及6、9、12、16和18 MeV电子束的每月电离室测量值进行了比较。以常规QC记录为参考，对所有6 MV射束和几何形状（6MVBG）MPC测试失败进行了分析，以确定失败率以及真阴性和假阴性结果的数量。研究了常规QC测试失败与MPC测试失败之间的一致性。对于所有射束能量，1933次MPC输出和每月比较电离室测量值之间的平均一致性为0.2%，97.8%在1.5%以内，最大差异为2.9%。在6MVBG测试的5000 - 6000个MPC单个测试参数结果中，失败率最高的是射束输出变化（0.5%），其次是射束中心偏移（0.3%），并且……