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Development of an optimized LSO/LuYAP phoswich detector head for the Lausanne ClearPET demonstrator

Abstract : This paper describes the LSO/LuYAP phoswich detector head developed for the ClearPET small animal PET scanner demonstrator that is under construction in Lausanne within the Crystal Clear Collaboration. The detector head consists of a dual layer of 8/spl times/8 LSO and LuYAP crystal arrays coupled to a multi-anode photomultiplier tube (Hamamatsu R7600-M64). Equalistion of the LSO/LuYAP light collection is obtained through partial attenuation of the LSO scintillation light using a thin aluminum deposit of 20-35 nm on LSO and appropriate temperature regulation of the phoswich head between 30/spl deg/C to 60/spl deg/C. At 511keV, typical FWHM energy resolutions of the pixels of a phoswich head amounts to (28/spl plusmn/2)% for LSO and (25/spl plusmn/2)% for LuYAP. The LSO versus LuYAP crystal identification efficiency is better than 98%. Six detector modules have been mounted on a rotating gantry. Axial and tangential spatial resolutions were measured up to 4 cm from the scanner axis and compared to Monte Carlo simulations using GATE. FWHM spatial resolution ranges from 1.3 mm on axis to 2.6 mm at 4 cm from the axis.
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Submitted on : Tuesday, August 7, 2007 - 3:07:51 PM
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O. Devroede, M. Krieguer, M. Rey, J.-M. Vieira, J.-H. Jung, et al.. Development of an optimized LSO/LuYAP phoswich detector head for the Lausanne ClearPET demonstrator. IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2006, 53, pp.25-29. ⟨10.1109/TNS.2005.862958⟩. ⟨in2p3-00166584⟩



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