title: After-pulsing, cross-talk, dark-count, and gain of MPPC under 7-T static magnetic field.
abstract: Multi-pixel photon counters (MPPCs) have been used instead of photomultiplier tubes for positron emission tomography combined with magnetic resonance (PET-MR). However, the effects of the magnetic field (MF) on the intrinsic properties-gain, cross-talk, after-pulsing, and dark-count-have not been sufficiently investigated. Therefore, we measured these properties for two types of MPPCs-S10931-50P and S12572-50P-in a static 7-T MF. These properties were measured with a pulse-shape analysis using pulse data acquired by a digital oscilloscope in the presence of the MF (w/MF) and the absence of the MF (w/o MF) by changing the supplied over-voltages (from 0.95 to 2.1 V for S10931 and from 2.1 to 3.3 V for S12572). No significant differences between the w/MF and w/o MF cases were observed for either MPPC, suggesting that the gain, cross-talk, after-pulsing, and dark-count are insensitive to a 7-T MF. The present work shows that constant MPPC performance is expected under a strong MF and demonstrates positive results for PET-MR.
authors.affiliation: Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan. yhirano@gunma-u.ac.jp.|Gunma University, 3-39-22 Showa-Machi, Maebashi, Gunma, 371-8511, Japan. yhirano@gunma-u.ac.jp.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Hirano
authors.affiliation: Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Nishikido
authors.affiliation: Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kokuryo
authors.affiliation: Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
authors.forename: Taiga
authors.initials: T
authors.lastname: Yamaya
mesh_terms: D060526:Magnetic Fields; D017785:Photons; D013696:Temperature
keywords: After-pulse; Cross-talk; Dark-count; MPPC; PET-MR