Design a Multi-layered Depth of Interaction Detector with a 2:3 Ratio Between the Layers of Scintillation Pixel Arrays

초록

Small animal positron emission tomography (PET) uses a small gantry and thin and long scintillation pixels for high sensitivity and spatial resolution. A deterioration in spatial resolution occurs because of the thin and long scintillation pixels when a gamma-ray source is generated at the edge of a field of view (FOV) and is obliquely incident to a detector. A scintillation pixel array was constructed with multiple layers to solve this problem, and a depth of interaction (DOI) detector was designed, in which the size of each array was 2:3. DETECT2000 simulation was performed for a quantitative evaluation of flood images according to the DOI measurement of the designed detector and the thickness of the light guide used. The obtained flood images were quantitatively evaluated, and the DOI measurement was assessed. The results confirmed that the best flood image was obtained with a light guide of 1 mm thickness and that DOI measurement was possible. If this detector is applied to small animal PET, then the deterioration in spatial resolution occurring outside the FOV can be resolved. © 2023 The Korean Physical Society. All rights reserved.

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