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

Scientific paper - Original scientific paper

• Author: Mihael Makek
• Author: Damir Bosnar
• Author: Ana Marija Kožuljević
• Author: Luka Pavelić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

We investigated two detector modules, each consisting of a 8 × 8 matrix of GaGG:Ce crystals with a crystal size of 3 × 3 × 20 mm3 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 22Na 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±0.6% at 511 keV was observed and it was shown that the coincidence time resolution of 384±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.

• Keywords (english): GaGG; silicon photomultiplier; positron emission tomography; compton imaging; gamma polarization; TOFPET2
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Crystals
• Numbering: vol. 10, no. 12, 1073
• p-ISSN: 2073-4352
• DOI: https://doi.org/10.3390/cryst10121073
• URN:NBN: urn:nbn:hr:217:762299
• Publication: 2020-11-25
• Project: Number: EK-H2020-824093; Title (english): The strong interaction at the frontier of knowledge: fundamental research and applications; Acronym: STRONG-2020; Leader: Korolija, Milorad; Bosnar, Damir; Kumerički, Krešimir; Passek-Kumerički, Kornelija; Jurisdiction: eu; Funding stream: Kompetitivno projektno financiranje
• Document URL: https://www.mdpi.com/2073-4352/10/12/1073
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
• Created on: 2021-11-19 21:07:34