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Proceedings Paper

Dual-energy X-ray computed tomography system using a cadmium telluride detector and its application to gadolinium imaging
Author(s): Yasuhiro Miura; Eiichi Sato; Yasuyuki Oda; Satoshi Yamaguchi; Osahiko Hagiwara; Hiroshi Matsukiyo; Manabu Watanabe; Shinya Kusachi
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Paper Abstract

To obtain two tomograms with two different photon energy ranges simultaneously, we have performed dual-energy Xray photon counting using a cadmium telluride (CdTe) detector, two comparators, two frequency-voltage converters (FVCs), and an analog digital converter (ADC). X-ray photons are detected using the CdTe detector with an energy resolution of 1% at 122 keV, and the event pulses from a shaping amplifier are sent to two comparators simultaneously to regulate two thresholds of photon energy. The logical pulses from a comparator are sent to an FVC consisting of two integrators, a microcomputer, and a voltage-voltage amplifier. The smoothed outputs from the two FVCs are input to the ADC to carry out dual-energy imaging. To observe contrast variations with changes in threshold energy, we performed energy-dispersive computed tomography utilizing the dual-energy photon counting at a tube voltage of 100 kV and a current of 8.7 μA. Two tomograms were obtained simultaneously at two energy ranges of 34.0-50.2 keV and 50.2-100 keV. The photon-count subtraction was carried out using a computer program. The maximum count rate was 5.4 kilocounts per second with energies of 10.0-100 keV, and the exposure time for tomography was 10 min.

Paper Details

Date Published: 27 August 2015
PDF: 7 pages
Proc. SPIE 9594, Medical Applications of Radiation Detectors V, 959402 (27 August 2015); doi: 10.1117/12.2189262
Show Author Affiliations
Yasuhiro Miura, Iwate Medical Univ. (Japan)
Eiichi Sato, Iwate Medical Univ. (Japan)
Yasuyuki Oda, Iwate Medical Univ. (Japan)
Satoshi Yamaguchi, Iwate Medical Univ. (Japan)
Osahiko Hagiwara, Toho Univ. (Japan)
Hiroshi Matsukiyo, Toho Univ. (Japan)
Manabu Watanabe, Toho Univ. (Japan)
Shinya Kusachi, Toho Univ. (Japan)

Published in SPIE Proceedings Vol. 9594:
Medical Applications of Radiation Detectors V
H. Bradford Barber; Lars R. Furenlid; Hans N. Roehrig, Editor(s)

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