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Proceedings Paper

Development of avalanche photodiode arrays for positron emission tomography
Author(s): Ernesto V. Gramsch; William W. Moses; Eric M. Gullikson
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Paper Abstract

Results from avalanche photodiode arrays of the beveled edge type for use in PET systems are presented. Starting from a Si wafer, an avalanche photodiode was produced by deep Ga diffusion, followed by boron and phosphor diffusion. The detector exhibits low dark current and fast response, necessary for use in PET systems. The gain is determined by the external voltage, and values up to 200 are obtained without much excess noise. We measured the energy resolution of the detector coupled to a 3 by 3 by 30 mm3 BGO scintillator as used in PET systems in response to a 22Na gamma ray source. The energy resolution at the 511 keV line was found comparable to photomultiplier tubes coupled to a scintillator of the same size. Calculation of the electric field and width of the depletion region was done to calculate the thickness of the undepleted front region and to optimize the quantum efficiency for detection of BGO light.

Paper Details

Date Published: 11 April 1996
PDF: 7 pages
Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); doi: 10.1117/12.237837
Show Author Affiliations
Ernesto V. Gramsch, Univ. de Santiago (Chile)
William W. Moses, Lawrence Berkeley Lab. (United States)
Eric M. Gullikson, Lawrence Berkeley Lab. (United States)

Published in SPIE Proceedings Vol. 2708:
Medical Imaging 1996: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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