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Proceedings Paper

Monochromatic X-ray photon counting using an energy-selecting device and its application to iodine imaging
Author(s): Yasuyuki Oda; Eiichi Sato; Satoshi Yamaguchi; Osahiko Hagiwara; Hiroshi Matsukiyo; Manabu Watanabe; Shinya Kusachi
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Paper Abstract

Quasi-monochromatic photon counting was performed using a cadmium telluride detector and an energy-selecting device, consisting of two comparators and a microcomputer (MC). The two threshold energies are determined using low and high-energy comparators, respectively. The MC produces a single logical pulse when only a logical pulse from a low-energy comparator is input to the MC. Next, the MC never produces the pulse when two pulses from low and high-energy comparators are input to the MC, simultaneously. The logical pulses from the MC are input to a frequency-voltage converter (FVC) to convert count rates into voltages; the rate is proportional to the voltage. The output voltage from the FVC is sent to a personal computer through an analog-digital converter to reconstruct tomograms. The X-ray projection curves for tomography are obtained by repeated linear scans and rotations of the object at a tube voltage of 70 kV and a current of 12 μA. Iodine (I) K-edge CT was performed using contrast media and X-ray photons with a count rate of 2.2 kilocounts per second and energies ranging from 34 to 50 keV, since these photons with energies beyond I-K-edge energy 33.2 keV are absorbed effectively by I atoms.

Paper Details

Date Published: 27 August 2015
PDF: 6 pages
Proc. SPIE 9594, Medical Applications of Radiation Detectors V, 959405 (27 August 2015); doi: 10.1117/12.2189267
Show Author Affiliations
Yasuyuki Oda, Iwate Medical Univ. (Japan)
Eiichi Sato, 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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