PET imaging with amorphous selenium:  Modeling of the photoinduced response.
Published: 2007
Language: eng
Number of pages: 80
ISBN-13: 9780494274866
Description: Amorphous selenium (a-Se) is a low-cost, compact photodetector that exhibits high quantum efficiency and high avalanche gain with low dark current. Its photoinduced response is being evaluated for its suitability as a PET photodetector. A theoretical description of the avalanche gain and transient current has been developed. The sensitivity and optical time-of-flight responses of a 35 mum thick a-Se layer were measured to determine the hole impact ionization coefficient and also electron and hole mobilities for a range of electric fields. Using these parameters, the model indicated that a-Se was able to produce a gain of &sim;1000 with a rise time of &lt;2 ns and a charge collection time of &lt;90 ns. The contribution to energy resolution by the noise in the avalanche multiplication process was estimated to be 2.1%. These results show that a-Se has the potential to be used as a PET photodetector.
Notes: Source: Masters Abstracts International, Volume: 45-06, page: 3077.

Thesis (M.Sc.)--University of Toronto, 2007.

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