SU-E-T-384: An Easy Use Anthropomorphic Phantom for Lung IMRT QA

Medical Physics
E FanL Qin

Abstract

Even though lung IMRT plans are calculated based on patient CT with heterogeneity correction, patient-specific validations are often performed by using measurements in homogeneous solid media. In this study we developed heterogeneous phantoms for measurement-based validation of lung IMRT. Three slabs from thorax region of anthropomorphic RANDO phantom and virtual water (VW) slabs were used to construct two versions of heterogeneous phantom, "Hetero-1" and "Hetero-2". The RANDO slabs are 2.5 cm thick. A two-dimensional diode array detector, MapCHECK and an ion chamber were used for measurements. "Hetero-1" consisted of three RANDO slabs placed horizontally on the MapCHECK plus a 3cm VW on the top. Hetero-2 was constructed by inserting a 2 cm VW with a chamber cavity on top of the first RANDO slab above the MapCHECK. Two lung-IMRT plans were generated using Pinnacle TPS, including a plan for the RPC Lung-Phantom. The point doses were compared with ion chamber measurements and planar dose were compared with MapCHECK measurements. The MapCHECK measurements were performed using "Hetero-1" on a beam-by-beam basis for the two IMRT plans. Passing rates under 3%/3mm Gamma criteria of were from 93.5% to 98.5% for all beams. Accumulative ...Continue Reading

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