Investigation of GaGG:Ce with TOFPET2 ASIC Readout for Applications in Gamma Imaging Systems

Crystals

Damir Bosnar¹  Mihael Makek¹  AnaMarija Kožuljević¹  Luka Pavelić² 

[1] Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia;Institute for Medical Research and Occupational Health, Ksaverska cesta 2, 10000 Zagreb, Croatia;

关键词: GaGG;    silicon photomultiplier;    positron emission tomography;    compton imaging;    gamma polarization;    TOFPET2;   

DOI  :  10.3390/cryst10121073

来源: DOAJ

【 摘 要 】

We investigated two detector modules, each consisting of a 8 × 8 matrix of GaGG:Ce crystals with a crystal size of 3 × 3 × 20 mm${}^3$ and a 3.2 mm pitch. The light is collected by a 8 × 8 silicon photomultiplier array, with one silicon photomultiplier matching one crystal. The signals are read out and processed using the TOFPET2 ASIC. Performed laboratory tests of the detectors were performed using a ${}^{22}$Na source, where energy and coincidence time resolution with different optical coupling were examined between the crystals and silicon photomultipliers, as well as under various operating voltages. The mean energy resolution of $9.8\pm 0.6\%$ at 511 keV was observed and it was shown that the coincidence time resolution of $384\pm 33$ ps could be achieved. The results reassure that the GaGG scintillator is a very promising candidate for the development of imaging systems, in particular, ones utilizing Compton scattering where the energy resolution plays a critical role and a moderate timing performance is acceptable.

【 授权许可】

Unknown