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A LSO scintillator array for a PET detector module with depth of interaction measurement

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4 Author(s)
Huber, J.S. ; Lawrence Berkeley Nat. Lab., California Univ., Berkeley, CA, USA ; Moses, W.W. ; Andreaco, M.S. ; Petterson, O.

Presents construction methods and performance results for a production scintillator array of 64 optically isolated, 3×3×30 mm sized LSO crystals. This scintillator array has been developed for a PET detector module consisting of the 8×8 LSO array coupled on one end to a single photomultiplier tube (PMT) and on the opposite end to a 64 pixel array of silicon photodiodes (PD). The PMT provides an accurate timing pulse and initial energy discrimination, the PD identifies the crystal of interaction, the sum provides a total energy signal, and the PD/(PD+PMT) ratio determines the depth of interaction (DOI). Unlike the previous LSO array prototypes, the authors now glue Lumirror reflector material directly onto 4 sides of each crystal to obtain an easily manufactured, mechanically rugged array with their desired depth dependence. With 511 keV excitation, the authors obtain a total energy signal of 3600 electrons, pulse-height resolution of 25% fwhm, and 6-15 mm fwhm DOI resolution

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Nuclear Science Symposium Conference Record, 2000 IEEE  (Volume:2 )

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