TY - JOUR
T1 - Coded aperture imager with depth of interaction scintillators
AU - Lee, Taewoong
AU - Lee, Hyounggun
AU - Lee, Wonho
N1 - Funding Information:
This work was supported by the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety [grant number 1603015] .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/2/21
Y1 - 2020/2/21
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
U2 - 10.1016/j.nima.2019.01.010
DO - 10.1016/j.nima.2019.01.010
M3 - Review article
AN - SCOPUS:85060278502
VL - 954
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
M1 - 161783
ER -