Progress in developing a combined x-ray CT and SPECT system using CdZnTe detector

Koji Iwata; Bruce H. Hasegawa; Colby D. Boles; Paul R. Bennett; Kanai S. Shah; Bernhard E. Boser

doi:10.1117/12.368170

6 October 1999 Progress in developing a combined x-ray CT and SPECT system using CdZnTe detector

Koji Iwata, Bruce H. Hasegawa, Colby D. Boles, Paul R. Bennett, Kanai S. Shah, Bernhard E. Boser

Proceedings Volume 3770, Medical Applications of Penetrating Radiation; (1999) https://doi.org/10.1117/12.368170
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Koji Iwata, Bruce H. Hasegawa, Colby D. Boles, Paul R. Bennett, Kanai S. Shah, and Bernhard E. Boser "Progress in developing a combined x-ray CT and SPECT system using CdZnTe detector", Proc. SPIE 3770, Medical Applications of Penetrating Radiation, (6 October 1999); https://doi.org/10.1117/12.368170

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KEYWORDS

Sensors

X-rays

Electronics

X-ray detectors

Single photon emission computed tomography

Gamma radiation

Digital electronics

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