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Monte Carlo Simulation of XHA600D 6MV Linear Accelerator

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Y DAI

Y DAI1*, H LIN2, B WU3, J CAI4, X PEI5, R CAO6, C CHEN7, (1) School of Electronic Science & Application Physics, Hefei University of Technology, Hefei, China,(2) School of Electronic Science & Application Physics, Hefei University of Technology, Hefei, China, (3) School of Electronic Science & Application Physics, Hefei University of Technology, Hefei, China,(4) School of Electronic Science & Application Physics, Hefei University of Technology, Hefei, China ,(5) Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, China,(6) Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, China,(7) Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, China,

SU-E-T-19 Sunday 3:00PM - 6:00PM Room: Exhibit Hall

Purpose:
A Monte Carlo model of XHA600D 6MV Linac is built, which provides the tool to validate and analyses the beam feature for ARTS (Accurate Radiotherapy System).

Methods:
Monte Carlo method is a useful tool to build the Linac model for an accurate TPS. This work uses BEAMnrc and DOSXYZnrc to model XHA600D Linac. The simulation is divided into three parts: the first part is the accelerator fixed part for different fields, which includes from the target to the mirror. This part PSF (phase space file) is very important to ensure the precision of the following simulation. Thus the largest PSF is simulated without variance reduced techniques except for the high electron cut-off (1MeV) to ensure the efficiency of recorded particles. The second part is the beam adjustable part including JAW and MLC to form different fields. A set of PSFs is obtained to store the different field information. The third part is the phantom simulation irradiating by the 2th PSF using DOSXYZnrc. The energy of the incident mono-energy electron is adjusted by matching the simulation to the measured PDD and OAR for 10cmx10cm field, as well as referring to other fields, such as 5cmx5cm and 20cmx20cm .

Results:
After many iterations of trial and error, the optimized 6 MV is ensured for XHA600D 6MV. A Gaussian beam profile (with σ = 1 mm, FHWH= 0.0 MeV) is used for the incident electron beam at the target surface. The difference is under 2%/3mm for in the field and in the penumbra. An irregular field forming by MLC also is simulated.

Conclusion:
This work builds a Monte Carlo model of XHA600D 6MV Linac to provide the tool for the dose validation and the beam feature analysis for ARTS.

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