NDLI: Spatial pileup considerations for pixellated gamma-ray detectors

Content Provider	IEEE Xplore Digital Library
Author	Furenlid, L.R. Clarkson, E. Marks, D.G. Barrett, H.H.
Copyright Year	2000
Description	Author affiliation: Dept. of Radiol., Arizona Univ., Tucson, AZ, USA (Furenlid, L.R.)
Abstract	High-spatial-resolution solid-state detectors being developed for gamma-ray applications benefit from having pixel dimensions substantially smaller than detector slab thickness. This leads to an enhanced possibility of charge partially spreading to neighboring pixels as a result of diffusion (and secondary photon emission) transverse to the drift direction. An undesirable consequence is the effective magnification of the event "size" and the spatial overlap issues which result when two photons are absorbed in close proximity within the integration time of the detector/readout system. In this work, we develop the general statistics of spatial pileup in imaging systems and apply the results to detectors we are developing based on pixellated cadmium zinc telluride (CdZnTe) and a multiplexing application-specific integrated circuit (ASIC) readout. We consider the limitations imposed on total count rate capacity and explore in detail the consequences for the LISTMODE data-acquisition strategy. Algorithms are proposed for identifying and, where possible, resolving overlapping events by maximum-likelihood estimation. The efficacy and noise tolerance of these algorithms will be tested with a combination of simulated and experimental data in future work.
Starting Page	713
Ending Page	717
File Size	420393
Page Count	5
File Format	PDF
ISBN	0780356969
ISSN	10823654
DOI	10.1109/NSSMIC.1999.845767
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gamma ray detectors Gamma ray detection Application specific integrated circuits Solid state circuits Slabs Photonic integrated circuits Event detection Statistics Pixel Cadmium compounds
Content Type	Text
Resource Type	Article

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