Study on accurateness of percentage depth dose with Monte Carlo simulation algorithm

VernacularTitle:加速器百分深度剂量蒙特卡罗模拟计算准确性研究
Author: Xinye NI ; Xiaobing TANG ; Changran GENG ; Tao LIN ; Da CHEN
Publication Type:Journal Article
Keywords: Percent depth dose; Simulation algorithm value; Measured value
From: Chinese Journal of Radiation Oncology 2013;(1):64-67
CountryChina
Language:Chinese
Abstract: Objective To study the percentage depth dose difference (PDD) between Monte Carlo method and the measurement method.Methods Based on the detail treatment head structure designing by the manufacture,the BEAMnrc Monte Carlo code was used to simulate the 6 MV photon beams of a Siemens Primus linear accelerator.DOSXYZnrc program generated 6 MV X-ray parameters such as PDD,and it was measured by MP3 three-dimensional water of PTW corporation phantom.The deviation of PDD was calculated using formulas ((measured value-simulation algorithm value)/measured value × 100％).Results Distance from the surface of the water was less than 1.2 cm,the deviation of PDD was ＞ 2％.Distance from the surface greater than 1.2 cm,the deviation of PDD was ＜ 2％.Conclusion In the built-up areas,PDD obtained by the Monte Carlo simulation algorithm is more accurate.