1. ■ TOF-PET Imaging t1 t2  d = c x  t /2 When  t = 300 ps ➔  d = 4.5 cm Timing resolution required for MPPC Timing resolution required for MPPC ≤ 200 ps PET TOF-PET

2. ■ Results High time resolution Operating overvoltage range has expanded. Pulse intensity: 10 photons 6x4 mm 2, 50  m pitch : Standard MPPC : New MPPC C D E C E D Timing resolution has improved from 250 ps to 140 ps. 250 ps 140 ps

3. ■ Summary Standard MPPCNew MPPC Dark Count2.7 Mcps1.7 Mcps After Pulses> 100% 3% PDE38%43% Overvoltage Range 1.5 ~ 2.5 V2 ~ 3.5 V Gain0.8 ~ 1.2 x 10 6 1.1 ~ 1.4 x 10 6 Timing Resolution 250ps *1 140ps Overvoltage = 2.5 V 6x4 mm 2, 50  m pitch *1) overvoltage = 2.0 V

4. ■ Medical ・ PET MR-PET (Insensitive to magnetic field) TOF-PET(good timing resolution) DOI-PET(conpact) ■ Academic ・ High energy physics experiment ・ Elementary particle physics ・ Astronomy physics ■ Measurement ・ Distance measurement ・ DNA Sequencer ・ Diagnosis of blood ・ Fluorescence measurement Applications e+e+ e-e- x γ γ ｔ1ｔ1 t2 （ t2 - t1 ) ・ c X = 2 TOF-PET DOI-PET

5. 64ch (8x8) array: C11206-0808 series Amp circuit HV module S11834-3388DF discrete 64ch array of 3×3mm, 50 μ m pitch with FPC Including ASIC(2 of 32ch preamplifier) and bias circuit for MPPC Resistive charge division network