Objective: To simulate the multi-leaf collimator of Varian linear accelerator using Monte Carlo method.
Methods: The multi-leaf collimator model was established using the DYNVMLC module of BEAMnrc and validated by comparison of Monte Carlo simulation and actual measurement results.
Results: The simulation results were well consistent with the actual measurement results with a bias of less than 3%.
Conclusion: The multi-leaf collimator of Varian linear accelerator can be successfully modeled using Monte Carlo method for analysis of the impact of the geometric properties of the multi-leaf collimator on the dose distribution.
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