Abstract
Abstract
The ClearMind project aims to develop a TOF-PET
position-sensitive detection module optimized for time and spatial
resolutions and detection efficiency. For this, we use a
59 mm× 59 mm × 5 mm monolithic PbWO4 (PWO)
crystal, which is encapsulated within a commercial Micro-Channel
Plate Photomultiplier tube MAPMT253 with a bialkali photocathode
directly deposited on the crystal. We report the proof of concept of
the directly deposited of a bialkali photocathode on a PWO crystal
and its stability over time. The full calibration of the ClearMind
photodetector module in the single-photoelectron regime is
described. We measured a time resolution of 70 ps FWHM using a
20 ps pulsed laser. We present the performance of the prototype
used in coincidence with a 3 × 3 × 3 mm3
LYSO:Ca,Ce crystal readout by a SiPM. We obtained a coincidence time
resolution of 350 ps FWHM, a spatial resolution of 4 to 5 mm, and
a detection efficiency of 28 %, consistent with Monte Carlo
simulations of the ClearMind detector module.