TY - JOUR
T1 - Development of a Position-Sensitive 4π Compton Camera Based on a Single Segmented Scintillator
AU - Lee, Hyounggun
AU - Lee, Taewoong
AU - Lee, Wonho
N1 - Funding Information:
Manuscript received July 2, 2020; revised September 23, 2020; accepted November 7, 2020. Date of publication November 19, 2020; date of current version December 16, 2020. This work was supported in part by the Nuclear Safety Research Program of the Korea Foundation of Nuclear Safety (KoFONS) through the Nuclear Safety and Security Commission (NSSC) of the South Korea under Grant 1903006 and in part by the National Research Foundation of Korea (NRF) Grant funded by the Korea Government (MSIT) under Grant 2020R1A2C1005924.
PY - 2020/12
Y1 - 2020/12
N2 - Scintillator-based Compton cameras, which comprise of a separated scatter and absorption detectors, neglect the Compton scattering that is followed by a photoelectric effect in a single set of scintillators, wherein the detection efficiency is severely limited. In this study, we propose a 3-D position-sensitive Compton camera that uses a single set of scintillators, wherein radiation interactions inside the scintillator can be discriminated. The proposed Compton camera comprises a segmented lutetium-yttrium oxyorthosilicate scintillator coupled with two position-sensitive silicon photomultipliers on both sides. Compton image reconstruction algorithms, such as simple back-projection, list-mode maximum likelihood expectation maximization (MLEM), and filtered back-projection, were applied and compared. The single position-sensitive Compton camera identified the positions of multiple radiation sources with various energies in a $4\pi $ field of view. The signal-to-noise ratio (SNR) and full-width at half-maximum (FWHM) of a reconstructed 511-keV point source were approximately 12° and 22°, respectively, after MLEM was applied, and the two 511-keV sources with an angle difference of 40° were separately reconstructed. The intrinsic efficiency of the proposed Compton camera was $2.23\times 10^{-2}$ for 511 keV.
AB - Scintillator-based Compton cameras, which comprise of a separated scatter and absorption detectors, neglect the Compton scattering that is followed by a photoelectric effect in a single set of scintillators, wherein the detection efficiency is severely limited. In this study, we propose a 3-D position-sensitive Compton camera that uses a single set of scintillators, wherein radiation interactions inside the scintillator can be discriminated. The proposed Compton camera comprises a segmented lutetium-yttrium oxyorthosilicate scintillator coupled with two position-sensitive silicon photomultipliers on both sides. Compton image reconstruction algorithms, such as simple back-projection, list-mode maximum likelihood expectation maximization (MLEM), and filtered back-projection, were applied and compared. The single position-sensitive Compton camera identified the positions of multiple radiation sources with various energies in a $4\pi $ field of view. The signal-to-noise ratio (SNR) and full-width at half-maximum (FWHM) of a reconstructed 511-keV point source were approximately 12° and 22°, respectively, after MLEM was applied, and the two 511-keV sources with an angle difference of 40° were separately reconstructed. The intrinsic efficiency of the proposed Compton camera was $2.23\times 10^{-2}$ for 511 keV.
KW - Nuclear facility regulation
KW - nuclear imaging
KW - radioactive pollution
KW - solid scintillators
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U2 - 10.1109/TNS.2020.3037896
DO - 10.1109/TNS.2020.3037896
M3 - Article
AN - SCOPUS:85096835710
VL - 67
SP - 2511
EP - 2522
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 12
M1 - 9264252
ER -