Development of MPPC array module

Multi-Pixel Photon Counter (MPPC) is a solid state photon counting device consisting of Geiger-mode APD pixels and self-quenching resistors. The MPPC has attractive features, such as low bias voltage operation, high gain, compact size, robustness and insensitivity to magnetic fields. Therefore, MPPC applications are now being expanded, especially for very low light level measurements. We have developed a new MPPC based PET detector module dedicated to TOF-PET systems. The module consists of a 16 × 16 Lutetium Fine Silicate (LFS) scintillator array with 3.2 mm pitch and a 16 × 16 Through-Silicone-Via (TSV) MPPC array, included analyzing circuits for gamma-ray detection, The performance of the module has been evaluated. The coincidence timing resolution was obtained 440 ps FWHM with a pair of the modules. The energy resolution value was 12.3% at 511 keV. All crystal segments were also clearly separated with uniform irradiation of 511 keV gamma-rays.