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The performance of silicon photomultipliers in Cherenkov TOF PET

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In time-of-flight positron emission tomography (TOF PET) one of the main factors limiting the time resolution is the time evolution of the scintillation process. This can be avoided by using exclusively the Cherenkov light produced in a suitable material. Sub 100 ps FWHM timing has already been experimentally demonstrated but with a drawback of relatively low detection efficiency due to the photodetectors used. In this work silicon photomultipliers (SiPMs) are considered as a photodetector in Cherenkov TOF PET. The detection efficiency can be significantly improved by using SiPMs, however, at room temperature the SiPM dark counts introduce a significant source of fake coincidences. SiPM samples from different producers were tested in a simple back-to-back setup in combination with lead fluoride Cherenkov radiators. Results for coincidence timing, detection efficiency and effects of dark counts at different temperatures and SiPM overvoltages are presented.

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Correspondence to Rok Dolenec.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Dolenec, R., Korpar, S., Krizan, P. et al. The performance of silicon photomultipliers in Cherenkov TOF PET. EJNMMI Phys 2, A1 (2015) doi:10.1186/2197-7364-2-S1-A1

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Keywords

  • Positron Emission Tomography
  • Fluoride
  • Time Evolution
  • Nuclear Medicine
  • Computational Mathematic