Spectral x-ray computed tomography scanner using a cadmium telluride detector

Eiichi Sato; Yasuyuki Oda; Satoshi Yamaguchi; Osahiko Hagiwara; Hiroshi Matsukiyo; Manabu Watanabe; Shinya Kusachi

doi:10.1117/12.2237526

3 October 2016 Spectral x-ray computed tomography scanner using a cadmium telluride detector

Eiichi Sato, Yasuyuki Oda, Satoshi Yamaguchi, Osahiko Hagiwara, Hiroshi Matsukiyo, Manabu Watanabe, Shinya Kusachi

Proceedings Volume 9969, Radiation Detectors: Systems and Applications XVII; 99690L (2016) https://doi.org/10.1117/12.2237526
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

To obtain four tomograms with four different photon energy ranges simultaneously, we have developed a quad-energy Xray photon counter with a cadmium telluride (CdTe) detector and four sets of comparators and frequency-voltage converters (FVCs). X-ray photons are detected using the CdTe detector, and the event pulses from a shaping amplifier are sent to four comparators simultaneously to regulate four threshold energies of 20, 35, 50 and 65 keV. Using this counter, the energy ranges are 20-100, 35-100, 50-100 and 65-100 keV; the maximum energy corresponds to the tube voltage. Xray photons in the four ranges are counted using the comparators, and the logical pulses from the comparators are input to the FVCs. The outputs from the four FVCs are input to a personal computer through an analog-digital converter (ADC) to carry out quad-energy imaging. To observe contrast variations with changes in the threshold energy, we performed spectral computed tomography utilizing the quad-energy photon counter at a tube voltage of 100 kV and a current of 8.0 μA. In the spectral CT, four tomograms were obtained simultaneously with four energy ranges. The image contrast varied with changes in the threshold energy, and the exposure time for tomography was 9.8 min.

Conference Presentation

Citation Download Citation

Eiichi Sato, Yasuyuki Oda, Satoshi Yamaguchi, Osahiko Hagiwara, Hiroshi Matsukiyo, Manabu Watanabe, and Shinya Kusachi "Spectral x-ray computed tomography scanner using a cadmium telluride detector", Proc. SPIE 9969, Radiation Detectors: Systems and Applications XVII, 99690L (3 October 2016); https://doi.org/10.1117/12.2237526

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