Abstract
The objective of this work was to create a comprehensive online tool to evaluate and review the performance of quality assurance measurements that assess beam output and profile constancy as soon as they are acquired using statistical process control. As part of routine quality assurance: output, flatness and symmetry measurements are acquired daily and weekly with DQA3 and the Matrix and symmetry and flatness are acquired on a monthly basis with Profiler2. An individuals control chart and a moving range control chart was plotted for each set of data. Upper and lower control limits were calculated using measurements acquired during a several month period when the linear accelerators were operating optimally. The existing action levels, established according to TG142 and CAPCA guidelines were compared with the calculated statistical control limits. Tighter tolerance limits were recommended for output, symmetry and flatness Matrix measurements and DQA3 flatness measurements.
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