Purpose: This study retrospectively applies statistical process control (SPC) methods to determine its utility in detecting changes in linear accelerator beam steering parameters prior to equipment failure (interlocks actuated) thereby increasing patient safety. Methods: Steering coil currents (SCC) for the transverse and radial planes are set such that a reproducibly useful photon or electron beam is available. SCC are sampled and stored in the control console computer each day during the morning warm‐up. Th…
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