Jun 13 – 15, 2012
LAL Orsay
Europe/Paris timezone

SiPM Photodetectors for Highest Time Resolution in PET

Jun 14, 2012, 11:00 AM
Amphithéâtre Pierre Lehmann (LAL Orsay)

Amphithéâtre Pierre Lehmann

LAL Orsay

Centre Scientifique d'Orsay - Bat 200 91898 Orsay cedex FRANCE
Oral presentation SiPM applications


Stefan Gundacker (Vienna University of Technology (AT))


Silicon photomultipliers (SiPM) have a wide range of applications in high energy and medical detector physics. Their excellent timing properties and compactness make them particularly interesting for time of flight positron emission tomography (TOF-PET). This study aims at determining the optimum detector conditions for highest time resolution in a TOF-PET system. The measurements are based on the time over threshold method in a coincidence setup using the ultra-fast amplifier-discriminator NINO and a fast oscilloscope. We compare commercial SiPMs of different SPAD types (Hamamatsu MPPC S10931-025P, S10931-050P and S10931-100P) and production batches. Similar to crystal dimensions typically used in current PET facilities, we chose LYSO:Ce crystals of 2x2x10mm3 size and obtained, with SiPMs of 50x50μm2 SPAD size, a coincidence time resolution (CTR) of 175±6ps FWHM. To further explore the timing capabilities of the SiPM, we also coupled shorter, i.e. 2x2x5mm3, Ca-co-doped LSO:Ce crystals to the 50μm type and obtained 142±9ps FWHM CTR. This performance makes SiPMs ideal candidates for photodetectors in high resolution TOF-PET systems. The results will be discussed in terms of SiPM dark noise, photon detection efficiency (PDE) and photon yield.

Primary author

Stefan Gundacker (Vienna University of Technology (AT))


Benjamin Armand Frisch (CERN) Etiennette Auffray Hillemanns (CERN) Hartmut Hillemanns (CERN) Paul Lecoq (CERN) Pierre Jarron (Universita e INFN (IT)) Tom Meyer (Conseil Europeen Recherche Nucl. (CERN))

Presentation materials