Machine Performance Check (MPC) Beam Consistency Checks for 3 TrueBeam Linac in Different Centers | ||||
| SECI Oncology Journal | ||||
| Volume 11, Issue 3, July 2023, Page 231-235 | ||||
 View on SCiNiTO | ||||
| Abstract | ||||
| Aim: The aim of this study is to evaluate the constancy of the TB MPC over a long period of time, as well as to compare the performance of multiple TB MPC systems across different centers. Methods: The TB MPC system was run daily at morning run-up on each Machine. The parameters tested by the MPC system and the corresponding tolerances are compared to the daily QA reports and the ionization chamber output. The results were statistically evaluated. Results: the % difference in 6 MV output as measured by the TB MPC system compared with the corresponding monthly ionization chamber measurement on the 3 Linacs from January 2017 to November 2022. The maximum difference was 2%. The difference was also within 2% in consistency for the 3 TB Linacs. The rate of failure to detect any misalignment or output change for all other parameters was 0.1% or less. Conclusion: our measurement indicates that MPC is appropriate as a daily output constancy check. There were a non-significant number of false negative results reported by MPC, and we would advocate the use of independent methods, such as the use of the Daily QA device, to quickly resolve these when they occur | ||||
| Keywords | ||||
| MPC; QA TrueBeam; Daily check; Output check | ||||
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