A study on extrapolation algorithm of percent depth dose

ZHONG Heli  WU Hegou  LI Longxing  LU Peifang

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A study on extrapolation algorithm of percent depth dose

更新时间：2021-03-12

- A study on extrapolation algorithm of percent depth dose
- NUCLEAR TECHNIQUES Issue 4, (2001)
- 作者机构：
  
  暨南大学医学院附属深圳市人民医院放疗科,深圳,518020
- 作者简介：
- 基金信息：
- DOI：
  CLC： TL501.7
- Published：01 April 2001
- 稿件说明：
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[1]钟鹤立,吴何苟,李隆兴,陆佩芳.医用加速器X线百分深度剂量外推计算研究[J].核技术,2001(04):300-304.

ZHONG Heli WU Hegou LI Longxing LU Peifang. A study on extrapolation algorithm of percent depth dose[J]. Nuclear techniques, 2001, (4): 300-304.
[1]钟鹤立,吴何苟,李隆兴,陆佩芳.医用加速器X线百分深度剂量外推计算研究[J].核技术,2001(04):300-304. DOI：

ZHONG Heli WU Hegou LI Longxing LU Peifang. A study on extrapolation algorithm of percent depth dose[J]. Nuclear techniques, 2001, (4): 300-304. DOI：

摘要

根据射线与物质相互作用理论

建立百分深度剂量（PDD）外推计算数学模型

将常规剂量仪测得的较浅水深PDD值外推到更深深度处

满足没有三维水箱放疗单位临床治疗需要。在2 0cm水深范围内

不同大小射野

PDD外推值与三维水箱测量值之间最大绝对差异为 0 .0 0 6×10 0 %

最大相对差异为 1.1%

两者相当吻合

Abstract

A mathematical model of extrapolating percent depth dose (PDD) was presented according to the principle of interaction between X-ray and water. The difference of extrapolated PDD by the model and measured PDD by 3D radiation field analizer is very small. For fields of different sizes within 20cm depth

the maximum absolute difference is 0.006×100% and the maximum relative difference is 1.1%. With the mathematical model

appropriate PDD values for different field sizes can be abtained without 3D radiation field analyses.

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