Reconstruction of bremsstrahlung spectrum from medical accelerator based on BiConjugate Gradients

LIN Guifen1; 2 LUO Limin2 1

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Reconstruction of bremsstrahlung spectrum from medical accelerator based on BiConjugate Gradients

更新时间：2021-03-12

- Reconstruction of bremsstrahlung spectrum from medical accelerator based on BiConjugate Gradients
- NUCLEAR TECHNIQUES Issue 8, (2007)
- 作者机构：
  
  1. 东南大学物理系
  2. 东南大学影像科学与技术实验室南京211189东南大学影像科学与技术实验室南京,210096
- 作者简介：
- 基金信息：
  
  2003年国家973项目基金(2003CB716102)资助
- DOI：
  CLC： R318
- Published：01 August 2007
- 稿件说明：
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[1]林桂粉,罗立民.基于双共轭梯度法医用加速器轫致辐射谱的重建[J].核技术,2007(08):694-698.

LIN Guifen1, 2 LUO Limin2 1. Reconstruction of bremsstrahlung spectrum from medical accelerator based on BiConjugate Gradients[J]. Nuclear techniques, 2007, (8): 694-698.
[1]林桂粉,罗立民.基于双共轭梯度法医用加速器轫致辐射谱的重建[J].核技术,2007(08):694-698. DOI：

LIN Guifen1, 2 LUO Limin2 1. Reconstruction of bremsstrahlung spectrum from medical accelerator based on BiConjugate Gradients[J]. Nuclear techniques, 2007, (8): 694-698. DOI：

摘要

本文应用双共轭梯度（BiConjugate Gradients

BiCG）法对4MV、10MV和15MV医用加速器的轫致辐射谱进行重建。以蒙特卡罗（MC）法的模拟结果为理论值

将BiCG法与Francois的谱向量代数（Spectral Vectorial Aalgebra

SVA）法的重建结果进行的比较表明

在透射系数未引入测量误差或测量得到的信噪比（SNR）较高时

在4—15MeV能量范围内

BiCG法比SVA法重建后的轫致辐射谱更加接近理论值;随着信噪比SNR的下降

BiCG法重建后的轫致辐射谱出现不稳定现象

而SVA法重建的结果则比较稳定。

Abstract

The bremsstrahlung spectra of 4MV

10MV and 15MV medical linear accelerators are reconstructed respectively by BiConjugate Gradients(BiCG)method. In order to test the validity and reliability of the BiCG method

the bremsstrahlung spectra simulated by Monte Carlo (MC)method are used as the theoretical spectra. The results of the reconstructed spectra using BiCG and using spectral vectorial algebra (SVA) method are compared with each other. When there is no measurement error or the Signal-to-Noise(SNR) of transmission coefficient is higher within the energy of 4—15MeV

the results show that the bremsstrahlung spectra reconstructed by BiCG are in better agreement with the the theoretical spectra than those reconstructed by SVA. When the SNR of transmission coefficient drops down

the bremsstrahlung spectra reconstructed by BiCG become instable while those reconstructed by SVA are stable.

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