| Experimental characterization of monolithic-crystal small animal PET detectors read out by APD arrays (2006) | |||||||||||
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| IEEE TRANSACTIONS NUCLEAR SCIENCE VOL JUNE Experimental Characterization Monolithic Crystal Small Animal PET Detectors Read Out APD Arrays Marnix Maas van der Laan Dennis Schaart Jan Huizenga Brouwer Peter Bruyndonckx Sophie onard Cedric Lema tre and Carel van Eijk Member IEEE Abstract Minimizing dead space one way increase the detection efficiency small animal PET scanners using monolithic scintillator crystals mm mm LSO loss efficiency due inter crystal reflective material minimized Readout such crystals can performed means one more avalanche photo diode APD arrays optically coupled the crystal The entry point gamma photon the crystal surface can estimated from the measured distribution the scintillation light over the APD array estimating the entry point correction for the depth interaction DOI automatically provided are studying the feasibility such detector modules this end channel test setup has been developed Experiments determine the effect the spatial resolution crystal surface finish and detector geometry have been carried out The first results these experiments are presented and compared simulation results The crystal surface finish has only small influence the spatial resolution The spatial resolution detectors significantly better when read out the front side than when read out the back side With crystal coupled two APD arrays very small resolution degradation only observed for incidence angle compared normal incidence Index Terms Angle incidence avalanche photod | |||||||||||
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