Performance evaluation of dual-crystal APD-based detector modules for positron emission tomography

Catherine M. Pepin; Philippe Bérard; Jules Cadorette; Marc-André Tétrault; Jean-Daniel Leroux; Jean-Baptiste Michaud; Stéfan Robert; Henri Dautet; Murray Davies; Réjean Fontaine; Roger Lecomte

doi:10.1117/12.653882

2 March 2006 Performance evaluation of dual-crystal APD-based detector modules for positron emission tomography

Catherine M. Pepin, Philippe Bérard, Jules Cadorette, Marc-André Tétrault, Jean-Daniel Leroux, Jean-Baptiste Michaud, Stéfan Robert, Henri Dautet, Murray Davies, Réjean Fontaine, Roger Lecomte

Author Affiliations +

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61420R (2006) https://doi.org/10.1117/12.653882
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

Positron Emission Tomography (PET) scanners dedicated to small animal studies have seen a swift development in recent years. Higher spatial resolution, greater sensitivity and faster scanning procedures are the leading factors driving further improvements. The new LabPET^TM system is a second-generation APD-based animal PET scanner that combines avalanche photodiode (APD) technology with a highly integrated, fully digital, parallel electronic architecture. This work reports on the performance characteristics of the LabPET quad detector module, which consists of LYSO/LGSO phoswich assemblies individually coupled to reach-through APDs. Individual crystals 2×2×~10 mm³ in size are optically coupled in pair along one long side to form the phoswich detectors. Although the LYSO and LGSO photopeaks partially overlap, the good energy resolution and decay time difference allow for efficient crystal identification by pulse-shape discrimination. Conventional analog discrimination techniques result in significant misidentification, but advanced digital signal processing methods make it possible to circumvent this limitation, achieving virtually error-free decoding. Timing resolution results of 3.4 ns and 4.5 ns FWHM have been obtained for LYSO and LGSO, respectively, using analog CFD techniques. However, test bench measurements with digital techniques have shown that resolutions in the range of 2 to 4 ns FWHM can be achieved.

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Catherine M. Pepin, Philippe Bérard, Jules Cadorette, Marc-André Tétrault, Jean-Daniel Leroux, Jean-Baptiste Michaud, Stéfan Robert, Henri Dautet, Murray Davies, Réjean Fontaine, and Roger Lecomte "Performance evaluation of dual-crystal APD-based detector modules for positron emission tomography", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61420R (2 March 2006); https://doi.org/10.1117/12.653882

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