Analysis of criteria applied to Tomotherapy DQA using statistical process control (SPC)

This study aims to analyze the suitability of the criteria applied to the analysis of Tomotherapy delivery quality assurance (DQA) at our institution using statistical process control (SPC). DQA data were retrospectively analyzed for 36 head and neck (H N), 57 abdomen, and 115 pelvic cases, measured over a 1-year period. ArcCHECK and A1SL ionization chambers were used for DQA measurement for the evaluation of gamma index and point dose error, respectively. Depending on the treatment site, the analysis parameters include the gamma pass rate (