Abstract
In this study, a coded-aperture imager with a depth of interaction (DOI) detector was designed and its performance was evaluated using a Monte Carlo simulation. The DOI coded-aperture imager consisted of a modified uniformly redundant array (MURA) and four layers of a 16 × 16 matrix of 2 mm cubic scintillators. To improve its performance, the reconstructed images from each layer were combined using a hybrid maximum likelihood expectation maximization (h-MLEM) technique. The DOI coded-aperture imager demonstrated higher signal-to-noise ratios (SNRs) in the reconstructed images, when compared with conventional coded-aperture imagers with 2D pixelated scintillators. In addition, various types of scintillators were tested and compared with respect to their RV curves, detection efficiencies, and SNRs. Among the tested scintillators, gadolinium aluminum gallium garnet (GAGG) demonstrated the highest performance above 356 keV. However, for low-energy radiation (< 200 keV), the performance of all the scintillators were similar. Because the timing resolution is shorter than those of other scintillators, LaBr3 could show a relatively high performance for measurement in high background conditions.
| Original language | English |
|---|---|
| Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| DOIs | |
| Publication status | Accepted/In press - 2019 Jan 1 |
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Keywords
- DOI coded aperture imager
- Hybrid update maximum likelihood expectation maximization (h-MLEM)
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Instrumentation
Cite this
Coded aperture imager with depth of interaction scintillators. / Lee, Taewoong; Lee, Hyounggun; Lee, Won Ho.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 01.01.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Coded aperture imager with depth of interaction scintillators
AU - Lee, Taewoong
AU - Lee, Hyounggun
AU - Lee, Won Ho
PY - 2019/1/1
Y1 - 2019/1/1
N2 - In this study, a coded-aperture imager with a depth of interaction (DOI) detector was designed and its performance was evaluated using a Monte Carlo simulation. The DOI coded-aperture imager consisted of a modified uniformly redundant array (MURA) and four layers of a 16 × 16 matrix of 2 mm cubic scintillators. To improve its performance, the reconstructed images from each layer were combined using a hybrid maximum likelihood expectation maximization (h-MLEM) technique. The DOI coded-aperture imager demonstrated higher signal-to-noise ratios (SNRs) in the reconstructed images, when compared with conventional coded-aperture imagers with 2D pixelated scintillators. In addition, various types of scintillators were tested and compared with respect to their RV curves, detection efficiencies, and SNRs. Among the tested scintillators, gadolinium aluminum gallium garnet (GAGG) demonstrated the highest performance above 356 keV. However, for low-energy radiation (< 200 keV), the performance of all the scintillators were similar. Because the timing resolution is shorter than those of other scintillators, LaBr3 could show a relatively high performance for measurement in high background conditions.
AB - In this study, a coded-aperture imager with a depth of interaction (DOI) detector was designed and its performance was evaluated using a Monte Carlo simulation. The DOI coded-aperture imager consisted of a modified uniformly redundant array (MURA) and four layers of a 16 × 16 matrix of 2 mm cubic scintillators. To improve its performance, the reconstructed images from each layer were combined using a hybrid maximum likelihood expectation maximization (h-MLEM) technique. The DOI coded-aperture imager demonstrated higher signal-to-noise ratios (SNRs) in the reconstructed images, when compared with conventional coded-aperture imagers with 2D pixelated scintillators. In addition, various types of scintillators were tested and compared with respect to their RV curves, detection efficiencies, and SNRs. Among the tested scintillators, gadolinium aluminum gallium garnet (GAGG) demonstrated the highest performance above 356 keV. However, for low-energy radiation (< 200 keV), the performance of all the scintillators were similar. Because the timing resolution is shorter than those of other scintillators, LaBr3 could show a relatively high performance for measurement in high background conditions.
KW - DOI coded aperture imager
KW - Hybrid update maximum likelihood expectation maximization (h-MLEM)
UR - http://www.scopus.com/inward/record.url?scp=85060278502&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85060278502&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2019.01.010
DO - 10.1016/j.nima.2019.01.010
M3 - Article
AN - SCOPUS:85060278502
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
ER -