GEANT4 simulation and imaging reconstruction by backprojection algorithm for Compton camera

DING Changji; MAO Benjiang; YUAN Yonggang; JIANG Zhigang; YANG Chaowen

doi:10.11889/j.0253-3219.2015.hjs.38.110402

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GEANT4 simulation and imaging reconstruction by backprojection algorithm for Compton camera

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- GEANT4 simulation and imaging reconstruction by backprojection algorithm for Compton camera
- NUCLEAR TECHNIQUES Vol. 38, Issue 11, Article number: 110402(2015)
- 作者机构：
  
  1. 四川大学物理科学与技术学院辐射物理及技术教育部重点实验室,成都,610065
  2. 中国工程物理研究院核物理与化学研究所,绵阳,621900
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.110402
  CLC：
- Published：13 November 2015
- 稿件说明：
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DING Changji, MAO Benjiang, YUAN Yonggang, et al. GEANT4 simulation and imaging reconstruction by backprojection algorithm for Compton camera [J]. Nuclear techniques, 2015, 38(11): 110402
DOI：

DING Changji, MAO Benjiang, YUAN Yonggang, et al. GEANT4 simulation and imaging reconstruction by backprojection algorithm for Compton camera [J]. Nuclear techniques, 2015, 38(11): 110402 DOI： 10.11889/j.0253-3219.2015.hjs.38.110402.

摘要

模拟构建了双层康普顿相机，利用康普顿散射原理，获取γ光子在两层探测器发生散射前后沉积的能量和位置信息，通过一定算法进行图像重建，获得放射源位置信息。该相机具有灵敏度高、体积小、应用范围广等优点。通过蒙特卡罗方法模拟了具有双层条状结构位置灵敏探测器（散射探测器、吸收探测器）组成的康普顿相机，其两层探测器分别由Si和Ge材料构成。利用反投影图像重建算法实现了放射源图像重建，当单点源与探测器距离为40 mm时，成像的效率为0.38%，位置分辨率达到8.0 mm，角分辨率达到3°。对于不同位置和不同个数点源的情况下，检验了反投影重建算法在康普顿相机放射源空间重建中的效果。

Abstract

Background: Due to its imaging principle advantages and the development of detectors

nuclear electronics

Compton camera has once again put forward. Purpose: This study aims to build a Compton camera via Monte Carlo simulation and test its backprojection algorithm. Methods: By using Monte Carlo simulation software GEANT4

a Compton camera with stripes structure is designed and data for reconstruction image of source is read out. Backprojection imaging reconstruction algorithm is studied for getting the reconstruction of source. Results: Using backprojection algorithm and simulated Compton camera

when the distance between source and the scattering detector is 40 mm

the spatial resolution is FWHM=8.0 mm

angular resolution is 3° and γ photon imaging efficiency is 0.38%

which are better than most of the pinhole and coded aperture γ camera imaging. Conclusion: Because of the existence of large amount of data

Compton camera needs long calculation time for measuring data. The next step is improving simulated Compton camera to study its performance parameters

while the maximum likelihood algorithm could improve the spatial resolution of Compton camera. Abstract

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