Development of avalanche photodiode arrays for positron emission tomography

Ernesto V. Gramsch; William W. Moses; Eric M. Gullikson

doi:10.1117/12.237837

11 April 1996 Development of avalanche photodiode arrays for positron emission tomography

Ernesto V. Gramsch, William W. Moses, Eric M. Gullikson

Proceedings Volume 2708, Medical Imaging 1996: Physics of Medical Imaging; (1996) https://doi.org/10.1117/12.237837
Event: Medical Imaging 1996, 1996, Newport Beach, CA, United States

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.

Citation Download Citation

Ernesto V. Gramsch, William W. Moses, and Eric M. Gullikson "Development of avalanche photodiode arrays for positron emission tomography", Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); https://doi.org/10.1117/12.237837

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