A 48×48 CdZnTe array with multiplexer readout

D. G. Marks; H. B. Barber; H. H. Barrett; E. L. Dereniak; J. D. Eskin; K. J. Matherson; J. M. Woolfenden; E. T. Young; F. L. Augustine; W. J. Hamilton; J. E. Venzon; B. A. Apotovsky; F. P. Doty

doi:10.1109/23.506673

A 48×48 CdZnTe array with multiplexer readout

D. G. Marks, H. B. Barber, H. H. Barrett, E. L. Dereniak, J. D. Eskin, K. J. Matherson, J. M. Woolfenden, E. T. Young, F. L. Augustine, W. J. Hamilton, J. E. Venzon, B. A. Apotovsky, F. P. Doty

Medical Imaging

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Abstract

We report results of gamma-ray imaging and energy-resolution tests of a 48×48 CdZnTe array. Our detectors have 125 μm square pixel electrodes produced by photolithography and are indium-bump-bonded to a multiplexer readout circuit. Using a collimated beam of 140 keV gamma rays of 120 μm diameter centered on one pixel, we found that the majority of events produced significant charge deposition in nearby pixels. Charge and energy are transported out of the pixel by charge diffusion, photoelectron range, Compton scattering, and escape of K × rays. These effects also distort single-pixel spectra, although photopeaks are still discernible at 140 keV. When signals from neighboring pixels are summed together to correct for this charge spreading, an energy resolution of 10 keV is obtained at 140 keV. Corrections will be simpler and energy resolution should be better for the 380 μm pixels of the 64×64 CdZnTe arrays we are constructing for an ultra-high-resolution brain imager.

Original language	English (US)
Pages (from-to)	1253-1259
Number of pages	7
Journal	IEEE Transactions on Nuclear Science
Volume	43
Issue number	3 PART 2
DOIs	https://doi.org/10.1109/23.506673
State	Published - 1996

ASJC Scopus subject areas

Nuclear and High Energy Physics
Nuclear Energy and Engineering
Electrical and Electronic Engineering

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@article{b7d6ecd796cc4560b8b5491d9a50f7ab,

title = "A 48×48 CdZnTe array with multiplexer readout",

abstract = "We report results of gamma-ray imaging and energy-resolution tests of a 48×48 CdZnTe array. Our detectors have 125 μm square pixel electrodes produced by photolithography and are indium-bump-bonded to a multiplexer readout circuit. Using a collimated beam of 140 keV gamma rays of 120 μm diameter centered on one pixel, we found that the majority of events produced significant charge deposition in nearby pixels. Charge and energy are transported out of the pixel by charge diffusion, photoelectron range, Compton scattering, and escape of K × rays. These effects also distort single-pixel spectra, although photopeaks are still discernible at 140 keV. When signals from neighboring pixels are summed together to correct for this charge spreading, an energy resolution of 10 keV is obtained at 140 keV. Corrections will be simpler and energy resolution should be better for the 380 μm pixels of the 64×64 CdZnTe arrays we are constructing for an ultra-high-resolution brain imager.",

author = "Marks, {D. G.} and Barber, {H. B.} and Barrett, {H. H.} and Dereniak, {E. L.} and Eskin, {J. D.} and Matherson, {K. J.} and Woolfenden, {J. M.} and Young, {E. T.} and Augustine, {F. L.} and Hamilton, {W. J.} and Venzon, {J. E.} and Apotovsky, {B. A.} and Doty, {F. P.}",

note = "Funding Information: We thank Jack Hall for providing the gamma ray sources and John Garcia for his help with the data acquisition system. This work was supported by National Institutes of Health Grant PO1 CA 23417.",

year = "1996",

doi = "10.1109/23.506673",

language = "English (US)",

volume = "43",

pages = "1253--1259",

journal = "IEEE Transactions on Nuclear Science",

issn = "0018-9499",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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TY - JOUR

T1 - A 48×48 CdZnTe array with multiplexer readout

AU - Marks, D. G.

AU - Barber, H. B.

AU - Barrett, H. H.

AU - Dereniak, E. L.

AU - Eskin, J. D.

AU - Matherson, K. J.

AU - Woolfenden, J. M.

AU - Young, E. T.

AU - Augustine, F. L.

AU - Hamilton, W. J.

AU - Venzon, J. E.

AU - Apotovsky, B. A.

AU - Doty, F. P.

N1 - Funding Information: We thank Jack Hall for providing the gamma ray sources and John Garcia for his help with the data acquisition system. This work was supported by National Institutes of Health Grant PO1 CA 23417.

PY - 1996

Y1 - 1996

N2 - We report results of gamma-ray imaging and energy-resolution tests of a 48×48 CdZnTe array. Our detectors have 125 μm square pixel electrodes produced by photolithography and are indium-bump-bonded to a multiplexer readout circuit. Using a collimated beam of 140 keV gamma rays of 120 μm diameter centered on one pixel, we found that the majority of events produced significant charge deposition in nearby pixels. Charge and energy are transported out of the pixel by charge diffusion, photoelectron range, Compton scattering, and escape of K × rays. These effects also distort single-pixel spectra, although photopeaks are still discernible at 140 keV. When signals from neighboring pixels are summed together to correct for this charge spreading, an energy resolution of 10 keV is obtained at 140 keV. Corrections will be simpler and energy resolution should be better for the 380 μm pixels of the 64×64 CdZnTe arrays we are constructing for an ultra-high-resolution brain imager.

AB - We report results of gamma-ray imaging and energy-resolution tests of a 48×48 CdZnTe array. Our detectors have 125 μm square pixel electrodes produced by photolithography and are indium-bump-bonded to a multiplexer readout circuit. Using a collimated beam of 140 keV gamma rays of 120 μm diameter centered on one pixel, we found that the majority of events produced significant charge deposition in nearby pixels. Charge and energy are transported out of the pixel by charge diffusion, photoelectron range, Compton scattering, and escape of K × rays. These effects also distort single-pixel spectra, although photopeaks are still discernible at 140 keV. When signals from neighboring pixels are summed together to correct for this charge spreading, an energy resolution of 10 keV is obtained at 140 keV. Corrections will be simpler and energy resolution should be better for the 380 μm pixels of the 64×64 CdZnTe arrays we are constructing for an ultra-high-resolution brain imager.

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A 48×48 CdZnTe array with multiplexer readout

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