ArticleEJNMMI physics2026
Performance of high-resolution PET detectors consisting of long GAGG slabs with different reflectors.
Article in EJNMMI physics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundDepth of interaction (DOI) encoding detectors are essential for pre-clinical or organ-dedicated PET scanners to simultaneously achieve high spatial resolution and high sensitivity. Semi-monolithic scintillator PET detectors inherently possess the DOI encoding capability that monolithic scintillator detectors have and can also improve the spatial resolution of the detector by reducing the edge effect. Compared to the widely used lutetium yttrium oxyorthosilicate (LYSO) scintillator, the newly developed gadolinium aluminum gallium garnet (GAGG) scintillator has a higher light output, which may lead to a better energy resolution and higher three-dimensional positioning accuracy in semi-monolithic PET detectors.
methodsThe semi-monolithic scintillator detectors consisted of 12 long GAGG slabs of 0.96 ⋅ 56 ⋅ 10 mm
resultsAll slabs are clearly identified from the flood histograms of both detectors. The average peak-to-valley ratios (PVRs), calculated from the line profiles through the center y-axis of the flood histograms, are 3.96 and 3.55 for detectors 1 and 2, respectively. The average energy resolutions are 15.6 ± 1.8% for detector 1 and 14.7 ± 1.2% for detector 2. The COG method provides y-position resolutions of 2.21 ± 0.77 mm for detector 1 and 2.16 ± 0.55 mm for detector 2, whereas the squared COG method provides y-position resolutions of 1.60 ± 0.32 mm and 1.59 ± 0.26 mm, respectively. The average DOI resolutions are 2.33 ± 0.68 mm for detector 1 and 2.37 ± 0.58 mm for detector 2. The average timing resolutions are 4.30 ± 0.57 ns for detector 1 and 4.76 ± 0.56 ns for detector 2. Compared to the detector using LYSO scintillator slabs, the detector using GAGG scintillator slabs provides similar y-position and DOI resolutions, a better energy resolution, a better PVR in the flood histogram and a worse timing resolution.
conclusionIn this work, the performance of two semi-monolithic scintillator detectors composed of GAGG slabs was investigated for the first time. The detector using the ESR reflector achieved similar y-position and DOI resolutions, slightly better energy resolution, and a poorer flood histogram compared to the detector using the BaSO
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