The purpose of this study is to evaluate the use of MapCHECK2 in a patient-specific quality assurance (QA) procedure for Rapid Arc (RA) radiotherapy and to obtain reference values of gamma index (γ) for different irradiation geometries. Dose distributions of 386 patients, optimized with Eclipse treatment planning system for RA on Varian Clinac 2300IX were exported and measured with MapCHECK2 detector array inserted in a MapPHAN dedicated phantom. Gamma index analysis was used to evaluate differences between calculated and delivered doses; collected data were analysed on the basis of complexity of plans and type of disease. Angular dependence and dose drift of detectors were estimated. The overall meanpassing rate (percentage of points with γ95% equal to 90.3% was obtained instead of 81.7% including all plans.
- Rapid arc
- Rotational IMRT
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Physics and Astronomy(all)