Validation of PRIMO Monte Carlo Model of Clinac?iX 6MV Photon Beam

摘要

Purpose: This study aims to model 6MV photon of Clinacsup?/supiX linear accelerator using PRIMO Monte Carlo (MC) code and to assess PRIMO as an independent MC-based dose verification and quality assurance tool. Materials and Methods: The modeling of Clinacsup?/supiX linear accelerator has been carried out by using PRIMO simulation software (Version 0.3.1.1681). The simulated beam parameters were compared against the measured beam data of the Clinacsup?/supiX machine. The PRIMO simulation model of Clinacsup?/supiX was also validated against Eclipsesup?/sup Acuros XB dose calculations in the case of both homogenous and inhomogeneous mediums. The gamma analysis method with the acceptance criteria of 2%, 2 mm was used for the comparison of dose distributions. Results: Gamma analysis shows a minimum pass percentage of 99% for depth dose curves and 95.4% for beam profiles. The beam quality index and output factors and absolute point dose show good agreement with measurements. The validation of PRIMO dose calculations, in both homogeneous and inhomogeneous medium, against Acurossup?/sup XB shows a minimum gamma analysis pass rate of 99%. Conclusions: This study shows that the research software PRIMO can be used as a treatment planning system-independent quality assurance and dose verification tool in daily clinical practice. Further validation will be performed with different energies, complex multileaf collimators fields, and with dynamic treatment fields.