Photon beam dosimetric characteristics of SIEMENS linear accelerator with/without flattening filter

CHEN Yong1 ZHANG Xuguang2 NI Jie1 KONG Dong1 CHEN Honglin2 CHEN Di1 SUN Liang1 1

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Photon beam dosimetric characteristics of SIEMENS linear accelerator with/without flattening filter

更新时间：2021-03-05

- Photon beam dosimetric characteristics of SIEMENS linear accelerator with/without flattening filter
- NUCLEAR TECHNIQUES Vol. 35, Issue 3, (2012)
- 作者机构：
  
  1. 苏州大学医学部放射医学与防护学院
  2. 徐州市肿瘤医院放疗科
- 作者简介：
- 基金信息：
  
  江苏高校优势学科建设工程(PAPD);江苏省级高校重点实验室开放研究课题(KJS1026)资助
- DOI：
  CLC： R144.1
- Published：01 March 2012
- 稿件说明：
移动端阅览
[1]陈勇,张旭光,倪婕,孔栋,陈宏林,陈迪,孙亮.西门子直线加速器均整和未均整射束的光子束剂量学特性[J].核技术,2012,35(03):179-184.

CHEN Yong1 ZHANG Xuguang2 NI Jie1 KONG Dong1 CHEN Honglin2 CHEN Di1 SUN Liang1 1. Photon beam dosimetric characteristics of SIEMENS linear accelerator with/without flattening filter[J]. Nuclear techniques, 2012, 35(3): 179-184.
[1]陈勇,张旭光,倪婕,孔栋,陈宏林,陈迪,孙亮.西门子直线加速器均整和未均整射束的光子束剂量学特性[J].核技术,2012,35(03):179-184. DOI：

CHEN Yong1 ZHANG Xuguang2 NI Jie1 KONG Dong1 CHEN Honglin2 CHEN Di1 SUN Liang1 1. Photon beam dosimetric characteristics of SIEMENS linear accelerator with/without flattening filter[J]. Nuclear techniques, 2012, 35(3): 179-184. DOI：

摘要

利用BEAMnrc和DOSXYZnrc蒙特卡罗程序研究西门子直线加速器6 MV能量均整和未均整光子束的剂量学特点。比较两种射束的深度剂量分布、离轴比剂量分布、中心轴剂量率和总散射因子。结果表明

未均整射束各射野的百分深度剂量均比均整射束的低;中心轴剂量率比均整射束大

且两种射束中心轴剂量率比值随射野和深度的增加逐渐下降;除此之外

未均整射束的半影宽度及总散射因子随深度的变化趋势均比均整射束小。未均整射束的剂量学优势可用于临床应用。

Abstract

In this study

dosimetric characteristics of percentage depth dose

beam profiles

dose rate on the central axis

and total scattering factor

were estimated by using BEAMnrc and DOSXYZnrc Monte Carlo code

for 6 MV photon beams from a SIEMENS linac with and without flattening filter.The results showed that the percentage depth dose of flattening filter free(FFF) beam were lower than flattening filter(FF) beam;the dose rate on central axis was higher than FF beam

and the ratio of FFF/FF decreased with field size and depth increasing.Besides

the width of penumbra for FFF beam was slightly smaller than that of with FF case.And the variation of total scatter factor showed the flattening filter free mode had smaller depth dependence than flattening filter mode.Our study shows that the beams without flattening can be advantageous in clinical applications.

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