Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (12): 120302-120302.doi: 10.11889/j.0253-3219.2017.hjs.40.120302


Monte Carlo simulation and validation of the enhanced dynamic wedge of Varian accelerator

DAI Zhenhui1, ZHAO Shiwu1, YANG Geng1, ZHU Lin1, ZHANG Bailin1, ZHU Yuanhu1, JIN Huaizhi1, WANG Xuetao1, ZHANG Yu2   

  1. 1 Guangdong Provincial Hospital of Chinese Medicine, Guangzhou 510006, China;
    2 Southern Medical University, Guangzhou 510515, China
  • Received:2017-06-29 Revised:2017-08-23 Online:2017-12-10 Published:2017-12-08
  • Supported by:
    Supported by National Natural Science Foundation of China (No.61671230)

Abstract: Background: Enhanced dynamic wedge (EDW) is commonly used to achieve dose uniformity in the target volume in radiotherapy. However, EDW must be verified before implementation in the treatment planning system. Purpose: This paper is to simulate the EDW of Varian linear accelerator by Monte Carlo method, and to construct a new tool for quality assurance of EDW. Methods: EDW is simulated with the DYNJAWS module of BEAMnrc to build the source model. Depth dose and off-axis dose are calculated by use of DOSXYZnrc in a phantom to generate the EDW factor and profiles of EDW at different angles. The model is validated based on the comparison of Monte Carlo simulation and real measurement results. Results: The simulation results are in good agreement with measurement results, and the deviation is less than 2%. Conclusion: It demonstrates that the EDW model based on Monte Carlo simulation is effective, which would achieve the requirement of quality assurance of EDW.

Key words: EDW, Monte Carlo simulation

CLC Number: 

  • TL72