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Title: Gamma-ray tracking for high energy gamma-ray imaging in pixelated CdZnTe

Abstract

Sequencing gamma-ray interactions within a detector system is an integral component of Compton imaging. In detectors with poor timing resolution compared to the time interval of successive interactions, algorithms which order gamma-ray interactions must be implemented using only energy and position information. This work examines previous algorithms and inspects interaction kinematics to increase the sequencing algorithm’s speed and effectiveness. The proposed method, in which the first interaction is assumed to deposit the largest energy, has improved sequencing performance by greater than 20% for full energy gamma ray depositions larger than 1 MeV that do not contain pair-production. In addition, the algorithm shows a decrease in computational costs for sequence reconstruction to allow for better real time reconstruction. Experimental results show an almost twofold increase in the signal to noise ratio (SNR) for simple backprojection images of a 22Na source. Additional measurements of the 2.2 MeV gamma rays from H 1(n,$$\gamma$$)D 2 neutron capture demonstrates the proposed algorithm’s superior performance.

Authors:
 [1];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22)
OSTI Identifier:
1524440
Grant/Contract Number:  
NA0002534
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Gamma-ray tracking; Compton event reconstruction; 3D position sensitive CdZnTe; Event sequencing; Compton kinematics; High energy gamma-ray imaging

Citation Formats

Shy, Daniel, and He, Zhong. Gamma-ray tracking for high energy gamma-ray imaging in pixelated CdZnTe. United States: N. p., 2018. Web. doi:10.1016/j.nima.2018.10.121.
Shy, Daniel, & He, Zhong. Gamma-ray tracking for high energy gamma-ray imaging in pixelated CdZnTe. United States. doi:10.1016/j.nima.2018.10.121.
Shy, Daniel, and He, Zhong. Mon . "Gamma-ray tracking for high energy gamma-ray imaging in pixelated CdZnTe". United States. doi:10.1016/j.nima.2018.10.121. https://www.osti.gov/servlets/purl/1524440.
@article{osti_1524440,
title = {Gamma-ray tracking for high energy gamma-ray imaging in pixelated CdZnTe},
author = {Shy, Daniel and He, Zhong},
abstractNote = {Sequencing gamma-ray interactions within a detector system is an integral component of Compton imaging. In detectors with poor timing resolution compared to the time interval of successive interactions, algorithms which order gamma-ray interactions must be implemented using only energy and position information. This work examines previous algorithms and inspects interaction kinematics to increase the sequencing algorithm’s speed and effectiveness. The proposed method, in which the first interaction is assumed to deposit the largest energy, has improved sequencing performance by greater than 20% for full energy gamma ray depositions larger than 1 MeV that do not contain pair-production. In addition, the algorithm shows a decrease in computational costs for sequence reconstruction to allow for better real time reconstruction. Experimental results show an almost twofold increase in the signal to noise ratio (SNR) for simple backprojection images of a 22Na source. Additional measurements of the 2.2 MeV gamma rays from H1(n,$\gamma$)D2 neutron capture demonstrates the proposed algorithm’s superior performance.},
doi = {10.1016/j.nima.2018.10.121},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}

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