The Monte Carlo Simulation of Tsinghua Homo-Source Dual-Beam Medical Accelerator

Objective:To apply Monte Carlo method in simulating the Homo-Source Dual-Beam medical accelerator developed by Tsinghua University and lay the foundation for future researches on the Accelerator's KV energy dose distribution in an image-guided radiotherapy procedure.Methods:(1)Using Monte Carlo's BEAMnrc program for simulating the head of Tsinghua Homo-Source Dual-Beam Medical Accelerator we obtained the Phase Space file which would be used as the source for the next step.(2) Using Monte Carlo's DOSXYZnrc program we calculated the percent depth dose(PDD) and off axis ratio(OAR),dealt the dose data by MATLAB program and displayed them in EXCEL.(3) Analyzed the impact of the Monte Carlo simulated parameters on the final outcome was analyzed.(4)Compared the PDD and OAR calculated with the measured of identical condition.Results:The PDD and OAR in water phantom simulated using Monte Carlo method were well matched with those measured in the actual experiments and the Accelerator's Monte Carlo model was achieved.Conclusions:The Accelerator's Monte Carlo simulated parameters of KV energy are apparently different from that of High-energy.To obtain the accurate Accelerator's Monte Carlo model,it is important to choose proper electron beam energy and electron space density distribution.The Accelerator's Monte Carlo model can be used in future researches on the image dose distribution.