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Published December 2016 | public
Journal Article

Studies of the high rate coincidence timing response of the STiC and TOFPET ASICs for the SAFIR PET scanner

Abstract

The proposed SAFIR PET detector will measure positron electron annihilations at injected activities up to 500 MBq in a mouse or rat. The system is required to have the best possible timing resolution in order to remove accidental coincidences (randoms) and maximise the image quality for short time frames allowing the possibility of 4-D kinetic modelling of simultaneous PET and MRI for the first time. Two different ASICs, TOFPET and STiC, have been investigated with LYSO crystal scintillators coupled to SiPM detectors and using ^(18)F sources up to 480 MBq. Timing responses are very encouraging with a coincidence time resolution of ~100 ps measured at low activities, degrading to 130 ps at the foreseen scanner maximum event rate. Sensitivities for single event rates and coincidences are measured and compared with Geant4 Monte Carlo simulations.

Additional Information

© 2017 IOP Publishing. Received 3 October 2016; Accepted 13 November 2016; Published 1 December 2016.

Additional details

Created:
August 19, 2023
Modified:
October 26, 2023