title: Simulation study of the backward-scattering effect in Compton imager.
abstract: In the field of nuclear medicine, nuclear security and astrophysics, Compton imaging is a promising technique for gamma-ray source imaging. We are developing a Compton imager using two layers of CdZnTe pixel array detectors. In this paper, the backward-scattering effect within such imagers is numerically studied using Geant4 Monte Carlo Package. From images reconstructed based on forward-scattering and backward-scattering imaging events, the imaging precision was investigated in a comparative analysis, in regard to energy resolution and position resolution. Furthermore, to establish a method to use backward-scattering imaging events properly so that the imaging efficiency can be significantly improved, the difference between reconstruction from forward-scattering and backward-scattering imaging events was analyzed to uncover a causal mechanism.
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China; Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Guo
authors.initials: G
authors.lastname: Xiaofeng
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China. Electronic address: xiangqingpei@163.com.
authors.forename: Xiang
authors.initials: X
authors.lastname: Qingpei
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Dongfeng
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Yi
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Fanhua
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Yingzeng
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Chu
authors.initials: C
authors.lastname: Chengsheng
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Na
mesh_terms: D000465:Algorithms; D002104:Cadmium; D003198:Computer Simulation; D005720:Gamma Rays; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D007091:Image Processing, Computer-Assisted / Q000706:statistics & numerical data; D009010:Monte Carlo Method; D011877:Radionuclide Imaging / Q000295:instrumentation / Q000706:statistics & numerical data*; D012542:Scattering, Radiation; D013691:Tellurium; D015032:Zinc
chemical_list: C474490:CdZnTe; D002104:Cadmium; D015032:Zinc; D013691:Tellurium
keywords: Backward-scattering effect; CdZnTe; Compton imager; Geant4; Monte Carlo