瓦里安扩充型动态楔形板的蒙特卡罗模拟与验证

基于蒙特卡罗方法模拟Varian直线加速器扩充型动态楔形板，建立动态楔形板的质量保证新工具。使用BEAMnrc的DYNJAWS组件模拟动态楔形板，建立加速器源模型，用DOSXYZnrc程序计算体模内的深度剂量和离轴剂量，获得不同角度楔形板的楔形因子和离轴剂量分布曲线，与相同条件的测量结果进行对比，验证动态楔形板模型的精确性。蒙特卡罗模拟结果与测量结果取得了很好的一致，偏差小于2％。表明使用蒙特卡罗程序建立扩充型动态楔形板模型是可行的，能够满足临床应用的质量保证需要。...

Full description

Saved in:
Bibliographic Details
Published in核技术 Vol. 40; no. 12; pp. 26 - 30
Main Author 戴振晖;招什武;杨耕;朱琳;张白霖;朱远湖;靳怀志;王学涛;张煜
Format Journal Article
LanguageChinese
Published 广东省中医院 广州 510006%南方医科大学 广州 510515 2017
Subjects
扩充型动态楔形板
蒙特卡罗模拟
扩充型动态楔形板
EDW
蒙特卡罗模拟
Monte Carlo simulation
Online AccessGet full text
ISSN0253-3219
DOI10.11889/j.0253-3219.2017.hjs.40.120302

Cover

More Information
Summary:基于蒙特卡罗方法模拟Varian直线加速器扩充型动态楔形板，建立动态楔形板的质量保证新工具。使用BEAMnrc的DYNJAWS组件模拟动态楔形板，建立加速器源模型，用DOSXYZnrc程序计算体模内的深度剂量和离轴剂量，获得不同角度楔形板的楔形因子和离轴剂量分布曲线，与相同条件的测量结果进行对比，验证动态楔形板模型的精确性。蒙特卡罗模拟结果与测量结果取得了很好的一致，偏差小于2％。表明使用蒙特卡罗程序建立扩充型动态楔形板模型是可行的，能够满足临床应用的质量保证需要。
Bibliography: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.
31-1342/TL
DAI Zhenhui1, ZHAO Shiwu1, YANG Geng1 ,ZHU L
ISSN:0253-3219
DOI:10.11889/j.0253-3219.2017.hjs.40.120302