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Optical fiber readout of scintillator arrays using a multi-channel PMT: a high resolution PET detector for animal imaging

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7 Author(s)
Cherry, S.R. ; Sch. of Med., California Univ., Los Angeles, CA, USA ; Yiping Shao ; Siegel, S. ; Silverman, R.W.
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The authors report the results from a new high resolution gamma ray imaging detector designed for use in a positron emission tomography (PET) system dedicated to small animal imaging. The detectors consist of an 8×8 array of 2×2×10 mm bismuth germanate (BGO) crystals coupled by 2 mm diameter double clad optical fibers to a 64 pixel multi-channel photomultiplier tube (MC-PMT). A charge division readout board is used to convert the 64 output channels into four position sensitive signals which determine the crystal of interaction. Measurements with a pair of these detectors demonstrate an intrinsic spatial resolution of 1.4 mm, a coincidence timing resolution of 15 ns and an energy resolution ranging between 35 and 60%. Based on these encouraging results, the design for a dedicated animal PET tomograph is proposed and simulations of this system project a reconstructed resolution of less than 2 mm within a 5 cm diameter transaxial field of view

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Nuclear Science, IEEE Transactions on  (Volume:43 ,  Issue: 3 )