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27 August 2015 Monochromatic X-ray photon counting using an energy-selecting device and its application to iodine imaging
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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.
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Yasuyuki Oda, Eiichi Sato, Satoshi Yamaguchi, Osahiko Hagiwara, Hiroshi Matsukiyo, Manabu Watanabe, and Shinya Kusachi "Monochromatic X-ray photon counting using an energy-selecting device and its application to iodine imaging", Proc. SPIE 9594, Medical Applications of Radiation Detectors V, 959405 (27 August 2015);

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