Impact of photon cross section uncertainties on Monte Carlo-determined depth-dose distributions

被引：3

作者：

Aguirre, E. ^{[1
]}

David, M. ^{[2
]}

deAlmeida, C. E. ^{[2
]}

Bernal, M. A. ^{[1
]}

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13081970 Campinas, SP, Brazil

[2] Univ Estado Rio de Janeiro, Lab Ciencias Radiol, Rio De Janeiro, RJ, Brazil

来源：

PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS | 2016年 / 32卷 / 09期

基金：

巴西圣保罗研究基金会;

关键词：

Monte Carlo; Systematic uncertainty; Photon cross sections; Dose distribution;

D O I：

10.1016/j.ejmp.2016.08.002

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

This work studies the impact of systematic uncertainties associated to interaction cross sections on depth dose curves determined by Monte Carlo simulations. The corresponding sensitivity factors are quantified by changing cross sections by a given amount and determining the variation in the dose. The influence of total and partial photon cross sections is addressed. Partial cross sections for Compton and Rayleigh scattering, photo-electric effect, and pair production have been accounted for. The PENELOPE code was used in all simulations. It was found that photon cross section sensitivity factors depend on depth. In addition, they are positive and negative for depths below and above an equilibrium depth, respectively. At this depth, sensitivity factors are null. The equilibrium depths found in this work agree very well with the mean free path of the corresponding incident photon energy. Using the sensitivity factors reported here, it is possible to estimate the impact of photon cross section uncertainties on the uncertainty of Monte Carlo-determined depth dose curves. (C) 2016 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.

引用

页码：1065 / 1071

页数：7

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