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Modeling the Agility head of the VersaHD accelerator and its beam profile by Geant4: Logfile-based geometry
Le Van Tinh1, Phan Viet Cuong2, Nguyen Van Kien3
1Vietnam National Cancer Hospital, 30 Cau Buou, Thanh Liet, Hanoi, Viet Nam; Nuclear Training Center, VINATOM, 140 Nguyen Tuan, Hanoi, Viet Nam.
None:
The motivation of this work is to develop a comprehensive Monte Carlo simulation code based on the Geant4 toolkit for modeling the Elekta Agility head of the VersaHD linear accelerator. This effort aims to support the treatment planning and medical research activities at Vietnam National Cancer Hospital. The code implementation allows reading the logfiles recorded during treatment and recalculating the actual patient dose distribution, which can be applied for patient-specific quality assurance (PSQA). The simulation model was validated through comparisons with experimental measurements, including percentage depth dose (PDD) and lateral dose profiles acquired using a water phantom and an ionization chamber dosimeter. A gamma index analysis demonstrated good agreement between simulation and measurement with the 3%/3 mm acceptance criteria for lateral dose profiles. Similarly, the PDD analysis with the 2%/2 mm acceptance criteria yielded equally satisfactory results.
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