Performance of FBK high-density SiPM technology coupled to Ce:LYSO and Ce:GAGG for TOF-PET.
This paper presents the performance, in terms of energy and timing resolution, of high-density silicon photomultipliers (SiPMs) produced at Fondazione Bruno Kessler for time-of-flight positron emission tomography application. The new SiPM technology allows us to produce devices with a small cell size maintaining a high fill factor (FF). The sensors considered in this paper are composed by 30 × 30 μm(2) cells with a FF exceeding 70% to cover a total area of 4 × 4 mm(2). The SiPM performance was evaluated using two types of scintillators (Ce:LYSO and Ce:GaGG) both with a short height (5 mm) in order to minimize the time jitter caused by light propagation in the crystal. With Ce:LYSO, an energy resolution of 9.0% FWHM at 511 keV and a coincidence resolving time (CRT) of 125 ps FWHM were obtained at -20 °C. With Ce:GaGG, an energy resolution of 6.4% FWHM and a CRT of 260 ps FWHM were achieved at the same temperature. The novel SiPM technology, combining a high PDE with a low correlated noise (i.e., crosstalk and afterpulse), allows us to improve the state-of-the-art of energy and timing resolution with both the tested crystals.
Fondazione Bruno Kessler, via Sommarive 18, Trento, Italy.
Alessandro
A
Ferri
Alberto
A
Gola
Nicola
N
Serra
Alessandro
A
Tarolli
Nicola
N
Zorzi
Claudio
C
Piemonte
D008027:Light; D049268:Positron-Emission Tomography / Q000379:methods*; D012588:Scintillation Counting / Q000379:methods*; D012825:Silicon; D013696:Temperature
D012825:Silicon