Dosimetric verification of two commercially available three‐dimensional treatment planning systems using the TG 23 test package

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Abstract
The Task Group 23 (TG‐23) radiation treatment planning dosimetry verification package was used to evaluate the dosimetric accuracy of two commercially available treatment planning systems. The TG‐23 test package contains experimentally measured beam data for two x‐ray beams (4 and 18 MV) that can be used as input for 3D‐RTP (three‐dimensional radiation treatment planning) systems. Once the beam data is entered and modeled, a series of test cases are performed that isolate different aspects of the dose computational process. The computed values from the 3D‐RTP system are compared against the measured dosimetry data, included in the package, for a set of comparison points within each test case. Both of the treatment planning systems that were studied provided excellent agreement between computed and measured doses. The cumulative 4 and 18 MV TG‐23 test results for the convolution/superposition based planning system indicates that 96% of the dosimetric test points are within ±2%, and 98% are within ±3% of the tabulated TG‐23 values. The dosimetric TG‐23 test results for the pencil beam kernel based planning system are similar, with 96% of the test points falling within ±2%, and 99% falling within ±3% of the TG‐23 measurements.