ABSTRACT: We have designed and developed a complementary metal-oxide-semiconductor (CMOS) solid-state photomultiplier (SSPM). We have studied this novel SSPM as a readout of LYSO scintillator for use in positron emission tomography (PET). Here we present energy resolution, coincidence timing resolution, depth of interaction measurements and flood imaging studies with SSPMs coupled to LYSO seintilators. Two different sizes, 3 x 3 mm<sup>2</sup> and 1.5 x 1.5 mm<sup>2</sup> SSPMs were studied. The measured FWHM energy resolution with 511 keV gamma rays was 22% for the detector consisting 3 x 3 mm<sup>2</sup> SSPM coupled to a 3 x 3 x 15 mm<sup>3</sup> LYSO and 11.2 % for the detector consisting 1.5 x 1.5 mm<sup>2</sup> SSPM coupled to 1.5 x 1.5 x 10 mm<sup>3</sup> LYSO. The timing resolution measured was 1.8 ns for the 3 x 3 mm<sup>2</sup> detector in coincidence with a detector consisting LSO coupled to PMT. The coincidence timing resolution was 530 ps for 1.5 x 1.5 mm<sup>2</sup> detector. The measured depth-of-interaction resolution by coupling two 1.5 x 1.5 mm<sup>2</sup> SSPMs on opposite ends of a 1.5 x 1.5 x 20 mm<sup>3</sup> LYSO scintillator was 2.5 mm. The flood histogram was recorded with a 4 x 4 LYSO array, each element measuring 1.5 x 1.5 x 15 mm<sup>3</sup> coupled to a position sensitive SSPM (PS-SSPM) consist of a 4 x 4 array of SSPM elements. The flood image was distortion free, all 16 elements were clearly visible and well separated from each other.
Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE;