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Optimization of DPC dSiPM-Based DOI Compton Camera by Monte Carlo Simulation

Title
Optimization of DPC dSiPM-Based DOI Compton Camera by Monte Carlo Simulation
Author
김찬형
Keywords
depth of interaction - DOI; digital silicon photomultiplier - dSiPM; Monte Carlo; optimization study; radiation measurement
Issue Date
2018-07
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, v. 65, no. 7, page. 1424-1431
Abstract
In this paper, a Compton camera capable of estimating depth of interaction (DOI) in the detector was designed and optimized using Geant4. The proposed DOI Compton camera consists of two pixelated CsI(TI) scintillators coupled with digital silicon photomultipliers [Digital Photon Counter (DPC)-3200-22]. The parameters affecting the performance of a Compton camera were evaluated for optimization in terms of image sensitivity and image resolution with a measure of figure of merit. The considered parameters were: 1) type of the reflector surface; 2) thickness of the scintillator; and 3) the distance between the scatter and the absorber detectors. The simulation results showed that a ground white surface is better than a polished white one. The optimal thickness and the scatter-absorber distance were found to be 15 mm and 4 cm, respectively. With the optimized parameters, performance of the DOI Compton camera was estimated for a Cs-137 source at 1 m using Geant4. The image resolutions were 6.06 degrees full-width at half-maximum with the list-mode maximum likelihood expectation maximization algorithm. It took 20 s to take Compton images for the gamma ray sources of 0.1 mu Sv/h intensity with the DOI Compton camera. It was shown that there was a clear improvement by employing DOI estimation algorithm in combination with the use of thick scintillators for a Compton camera.
URI
https://ieeexplore.ieee.org/document/8385140https://repository.hanyang.ac.kr/handle/20.500.11754/119334
ISSN
0018-9499; 1558-1578
DOI
10.1109/TNS.2018.2847319
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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