ClearPET Petite, consists of 16 detector modules arranged in a ring, had transaxial and axial field of view (FOV) of 100 mm and 18.1 mm, respectively. A detector module consists of a multi-channel PMT (Hamamatsu H7600-00-M64) and LSO/LuYAP phoswich crystals. Each phoswich detector module is composed of 8x8 matrixes of 2 mm x 2 mm x 8 mm crystals.The sensitivity of the PET system is 0.4% at the center of the FOV. The radial and tangential resolutions vary from 1.3 mm to 2.4 mm when the source is positioned at the center and 20 mm off-center of the FOV, respectively.
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