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

Zhenhui DAI; Shiwu ZHAO; Geng YANG; Lin ZHU; Bailin ZHANG; Yuanhu ZHU; Huaizhi JIN; Xuetao WANG; Yu ZHANG

doi:10.11889/j.0253-3219.2017.hjs.40.120302

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

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | 更新时间：2021-05-19

- Monte Carlo simulation and validation of the enhanced dynamic wedge of Varian accelerator
- NUCLEAR TECHNIQUES Vol. 40, Issue 12, Article number: 120302(2017)
- 作者机构：
  
  1.广东省中医院广州 510006
  2.南方医科大学广州 510515
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2017.hjs.40.120302
  CLC： TL72
- Received：29 June 2017，
  
  Revised：23 August 2017，
  
  Published：10 December 2017
- 稿件说明：
移动端阅览
Zhenhui DAI, Shiwu ZHAO, Geng YANG, et al. Monte Carlo simulation and validation of the enhanced dynamic wedge of Varian accelerator[J]. Nuclear techniques, 2017, 40(12): 120302
DOI：

Zhenhui DAI, Shiwu ZHAO, Geng YANG, et al. Monte Carlo simulation and validation of the enhanced dynamic wedge of Varian accelerator[J]. Nuclear techniques, 2017, 40(12): 120302 DOI： 10.11889/j.0253-3219.2017.hjs.40.120302.

摘要

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。

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.

关键词

Keywords

references

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