Figure 6

Individual control charts of percent γ values in VMAT QA processes at four acceptance criteria. The central line was represented by the average of a group of data. (a–h) γ values in coalescence and SA cohorts for both detectors, respectively. The arbitrary plan number for each dose-map was listed on x-axis. The differences between CL and LCL in coalesced scenarios were smaller than in SA scenarios. CL center line, LCL lower control limit.