Speaker
Mr
MYTHRA VARUN NEMALLAPUDI
(CERN)
Description
The coincidence time resolution (CTR) of 511keV gamma detectors is becoming increasingly important for time-of-flight positron emission tomography (TOF-PET) since the additional time information enables further background suppression in the reconstructed image. In this work we present CTR measurements performed with the latest generation FBK SiPMs coupled to LSO:Ce codoped 0.4%Ca crystals. We tested two differ- ent technologies, i.e RGB-HD (4x4mm2) and NUV (3x3mm2) both cou- pled to the same LSO:Ce codoped Ca crystals. With NUV SiPMs we measured best CTR values of 84±4ps FWHM for 2x2x3mm3 crystals and 140±5ps FWHM for 2x2x20mm3 crystals. We compare the measurements performed on same detectors at two independent test setups: FBK and CERN, each employing different electronics. The agreement in the results from the two setups was found to be within a few percent. We set these results into perspective against previous measurements on Hamamatsu SiPMs for identical crystals, and study various factors such as single pho- ton time resolution (SPTR), photon detection efficiency (PDE) and light extraction efficiency in order to understand the source of improvement in CTR.
Primary authors
Mr
MYTHRA VARUN NEMALLAPUDI
(CERN)
Mr
Stefan Gundacker
(CERN)
Co-authors
Dr
Alberto Gola
(Politecnico di Milano)
Mr
Alessandro Ferri
(Fondazione Bruno Kessler)
Dr
Claudio Piemonte
(Fondazione Bruno Kessler)
Mrs
Etiennette auffray
(CERN)
Dr
Paul Lecoq
(CERN)
