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Proceedings Paper

Performance evaluation of dual-crystal APD-based detector modules for positron emission tomography
Author(s): 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
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Paper 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 LabPETTM 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.

Paper Details

Date Published: 2 March 2006
PDF: 11 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61420R (2 March 2006); doi: 10.1117/12.653882
Show Author Affiliations
Catherine M. Pepin, Univ. de Sherbrooke (Canada)
Philippe Bérard, Univ. de Sherbrooke (Canada)
Jules Cadorette, Univ. de Sherbrooke (Canada)
Marc-André Tétrault, Univ. de Sherbrooke (Canada)
Jean-Daniel Leroux, Univ. de Sherbrooke (Canada)
Jean-Baptiste Michaud, Univ. de Sherbrooke (Canada)
Stéfan Robert, Univ. de Sherbrooke (Canada)
Henri Dautet, PerkinElmer Optoelectronics (Canada)
Murray Davies, PerkinElmer Optoelectronics (Canada)
Réjean Fontaine, Univ. de Sherbrooke (Canada)
Roger Lecomte, Univ. de Sherbrooke (Canada)


Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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