SU‐E‐T‐354: Efficient and Enhanced QA Testing of Linear Accelerators Using a Real‐Time Beam Monitor

TL;DRAbstract

Purpose: To investigate the feasibility of performing routine QA tests of linear accelerators (Linac) using the Integral Quality Monitoring (IQM) system. The system, consisting of a 1‐D sensitivity gradient large area ion‐chamber mounted at the collimator, allows automatic collection and analysis of beam data. Methods: The IQM was investigated to perform several QA constancy tests, similar to those recommended by AAPM TG142, of a Linac including: beam output, MLC calibration, beam symmetry, relative dose factor (RDF), dose linearity, output as a function of gantry angle and dose rate. All measurements by the IQM system accompanied a reference measurement using a conventional dosimetry system and were performed on an Elekta Infinity Linac with Agility MLC. The MLC calibration check is done using a Picket‐Fence type 2×10cm 2 field positioned at different off‐axis locations along the chamber gradient. Beam symmetry constancy values are established by signals from an 4×4cm 2 aperture locat

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