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Proceedings Paper

Progress in developing a combined x-ray CT and SPECT system using CdZnTe detector
Author(s): Koji Iwata; Bruce H. Hasegawa; Colby D. Boles; Paul R. Bennett; Kanai S. Shah; Bernhard E. Boser
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Paper Abstract

A medical imaging system providing both x-ray transmission and radionuclide measurements would allow correlation of structural and functional information. We therefore are evaluating a pixellated CdZnTe detector for combined x-ray CT and SPECT imaging with various readout electronics. Gamma-ray spectra of 57Co measured using NIM electronics (2-microsecond(s) shaping time) and multichannel fast photon-counting electronics (50-ns shaping time) produced energy resolutions of 6.5 keV FWHM and 17 keV FWHM respectively at 122 keV. Fast photon-counting electronics achieved linear x-ray count-rate response up to 4 X 105 cps. Dual-mode digital readout electronics are described, which promise to improve SPECT and x-ray CT performance in comparison to the fast-counting electronics. The leakage current and x-ray response with the dual-mode electronics are studied. The leakage current as small as tens of pA is measured, while detector current over 5 orders of magnitude is measured with linearity over 4 orders of magnitude. Results suggest that the CdZnTe detector is capable of performing both x-ray CT and SPECT with the fast photon-counting electronics, and the digital readout electronics can improve the x-ray CT performance.

Paper Details

Date Published: 6 October 1999
PDF: 9 pages
Proc. SPIE 3770, Medical Applications of Penetrating Radiation, (6 October 1999); doi: 10.1117/12.368170
Show Author Affiliations
Koji Iwata, Univ. of California/San Francisco (United States)
Bruce H. Hasegawa, Univ. of California/San Francisco and Univ. of California/Berkeley (United States)
Colby D. Boles, Univ. of California/San Francisco and Univ. of California/Berkeley (United States)
Paul R. Bennett, Radiation Monitoring Devices, Inc. (United States)
Kanai S. Shah, Radiation Monitoring Devices, Inc. (United States)
Bernhard E. Boser, Univ. of California/San Francisco and Univ. of California/Berkeley (United States)


Published in SPIE Proceedings Vol. 3770:
Medical Applications of Penetrating Radiation
H. Bradford Barber; Hans Roehrig, Editor(s)

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