Development of a Position-Sensitive 4π Compton Camera Based on a Single Segmented Scintillator
| Autor: | Wonho Lee, Taewoong Lee, Hyounggun Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics Physics::Instrumentation and Detectors 010308 nuclear & particles physics Point source Scattering business.industry Astrophysics::High Energy Astrophysical Phenomena Detector Compton scattering Field of view Iterative reconstruction Scintillator 01 natural sciences Silicon photomultiplier Optics Nuclear Energy and Engineering 0103 physical sciences Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Nuclear Science. 67:2511-2522 |
| ISSN: | 1558-1578 0018-9499 |
| DOI: | 10.1109/tns.2020.3037896 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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