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Test and optimization of timing algorithms for PET detectors with digital sampling front-end

Abstract : We tested a digital front-end concept in order to evaluate the time resolution of PET detectors based on APD or PMT with digital read-out. Measurements were done on a coincidence set-up with two detection blocks composed of a fast inorganic scintillator (LaBr3 or LYSO) coupled to a photodetector (APD or PMT), preamplificators and prefilters. The signals were sampled at high rate (250MHz for APDs, 5GHz for PMTs) and treated offline. Two different timing algorithms were applied: a digital method deriving from constant fraction discriminator, and an optimal filtering technique based on parameter estimation with minimal variance. The classical optimal filter was adapted to the non-stationary noise conditions, with a significant improvement of timing resolution. We describe these algorithms and discuss their performances.
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Submitted on : Tuesday, November 18, 2008 - 11:49:55 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:09 PM
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  • HAL Id : in2p3-00339573, version 1



Baptiste Joly, Gerard Montarou, J. Lecoq, G. Bohner, M. Crouau, et al.. Test and optimization of timing algorithms for PET detectors with digital sampling front-end. 2008 Nuclear Science Symposium, Medical Imaging Conference and 16th Room Temperature Semiconductor Detector Workshop, Oct 2008, Dresden, Germany. ⟨in2p3-00339573⟩



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