Evaluation of the ArcCHECK QA system for IMRT and VMAT verification

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
Guangjun LiQingfeng Jiang

Abstract

The purposes of this study were to perform tests for the ArcCHECK QA system, and to evaluate the suitability of this system for IMRT and VMAT verification. The device was tested for short term reproducibility, dose linearity, dose rate dependence, dose per pulse dependence, field size dependence, out of field dependence and directional dependence. Eight simple plans that each used four beams of different field sizes as well as IMRT and VMAT plans for various organs of 10 patients were measured by ArcCHECK. The phantom data was then compared with ion chamber measurements and planned results. The ArcCHECK diodes performed well for all tests except directional dependence, which varies from a minimum of -4.9% (seen only when the beam is incident on the diode at 180°) to a maximum of 9.1% (approximately at 105°). For simple plan verification, the absolute dose pass rates of γ index (3%/3 mm) were almost identical. They had an average pass rate of 94.6% ± 1.3% when the field size was ≤20 cm in the X direction (right to left direction), but the pass rate fell rapidly when the field size was >20 cm in the X direction. For all patient-specific IMRT and VMAT QA, the pass rates exceeded 95% and 93%, respectively, and high reproducibility ...Continue Reading

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