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

SiPM Photodetectors for Highest Time Resolution in PET

Jun 14, 2012, 11:00 AM
20m
Amphithéâtre Pierre Lehmann (LAL Orsay)

Amphithéâtre Pierre Lehmann

LAL Orsay

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

Speaker

Stefan Gundacker (Vienna University of Technology (AT))

Description

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))

Co-authors

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