Development of a prototype of time-over-threshold based small animal PET scanner

K. Shimazoe, H. Takahashi, K. Kamada, A. Yoshikawa, K. Kumagai, J. Kataoka, S. Itoh, H. Sato, Y. Usuki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A time-over-threshold (ToT)-based positron emission tomography (TODPET) scanner was designed and fabricated. The PET scanner consisted of eight block detectors, each of which is composed of a 12 12 array of 2 210 mm3 Pr:LuAG crystals individually coupled with a 12 12 UV-enhanced avalanche photodiode (APD) array. The APDs were individually read out using a custom-designed time-over-threshold application-specific integrated circuit (ASIC) and field-programmable gate array (FPGA) readout system. The PET scanner has an energy resolution of 10% and a time resolution of 4.2 ns. A spatial resolution of 1.17 mm (FWHM) was demonstrated in the initial results.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2014 Jul 21


  • Avalanche photodiode
  • Positron emission tomography
  • Time over threshold


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