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AID - A Novel Method for Improving the Imaging Resolution of a Table-Top Compton Camera

Authors
Seo, HeeLee, Se HyungJeong, Jong HwiLee, Ju HahnLee, Chun SikLee, Jae SungKim, Chan Hyeong
Issue Date
Oct-2008
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Absorber; Compton camera; Geant4; interaction depth
Citation
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, v.55, no.5, pp.2527 - 2530
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Volume
55
Number
5
Start Page
2527
End Page
2530
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/177863
DOI
10.1109/TNS.2008.2000777
ISSN
0018-9499
Abstract
A Compton camera is usually composed of a scatterer detector and an absorber detector. The interaction position resolution of the absorber detector is the critical or limiting detector parameter that most seriously affects the imaging resolution of the table-top Compton camera currently under development in our group. Currently, it is assumed that all interactions occur at the centers of the detector segments of the absorber detector (25-segmented germanium detector), which is a simple but obviously not the best practice, considering that the interaction depths of the photons in the absorber detector, especially of low-energy photons, are not distributed uniformly. More photons have interaction in the front region of the detector due to the limited penetrating depth of the photons. Therefore, the present study developed a novel, "average interaction depth (AID)" method, which improves the imaging resolution of Compton camera by additionally considering the average interaction depth of the incident photon in the absorber detector. Simulations with Geant4 showed that the imaging resolution of the Compton camera can be significantly improved by using the AID method. For example, the resolution for a 511 keV gamma point source was improved from 9.9 mm to 7.6 mm in full width half maximum (FWRM). For a 364 keV gamma point source, the improvement was even more significant from 11.4 mm to 7.2 mm.
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