Evaluation of a SiPM array detector coupled to a LFS-3 pixellated scintillator for PET/MR applications
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MEETING ABSTRACT
Open Access
Evaluation of a SiPM array detector coupled to a LFS-3 pixellated scintillator for PET/MR applications Stratos David1*, Eleftherios Fysikopoulos1, Maria Georgiou1,2, George Loudos1 From PSMR 2015: 4th Conference on PET/MR and SPECT/MR La Biodola, Isola d’Elba, Italy. 17-21 May 2015 1 Technological Educational Institute of Athens, Greece
SiPM arrays are insensitive to magnetic fields and thus good candidates for hybrid PET/MR imaging systems. Moreover, due to their small size and flexibility can be used in dedicated small field of view small animal imaging detectors and especially in head PET/MR studies in mice. Co-doped LFS-3 scintillator crystals have higher light yield and slightly faster response than that of LSO:Ce mainly due to the co-doped activation of emission centers with varying materials such as Ce, Gd, Sc, Y, La, Tb, or Ca distributed at the molecular scale through the lutetium silicate crystal host. The purpose of this study is to investigate the behavior of the SensL ArraySL-4 (4×4 element array of 3×3 mm2 silicon photomultipliers) optical detector coupled to a 6x6 LFS-3 scintillator array, with 2×2×5 mm3 crystal size elements, for possible applications in small field of view PET/MR imaging detectors. We have designed a symmetric resistive charge division circuit to read out the signal outputs of 4×4 pixel SiPM array reducing the 16 pixel outputs of the photodetector to 4 position signals. The 4 position signals were digitized using free running Analog to Digital Converters. The ADCs sampling rate was 50 MHz. An FPGA (Spartan 6 LX150T) was used for triggering and digital signal processing of the pulses. Experimental evaluation was carried out with 22Na radioactive source and the parameters studied where energy resolution and peak to valley ratio. The first preliminary results of the evaluation shows a clear visualization of the discrete 2×2×5 mm3 LFS-3 scintillator elements. The mean peak to valley ratio of the horizontal profiles on the raw image was measured equal to 11 while the energy resolution was calculated equal to 30% at the central pixels. Authors’ details 1 Technological Educational Institute of Athens, Greece. 2Department of Medical School, University of Thessaly, Larissa, Greece. Published: 18 May 2015
doi:10.1186/2197-7364-2-S1-A9 Cite this article as: David et al.: Evaluation of a SiPM array detector coupled to a LFS-3 pixellated scintillator for PET/MR applications. EJNMMI Physics 2015 2(Suppl 1):A9.
© 2015 David et al; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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