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27 August 2015 Dual-energy X-ray photon counting using an LSO-MPPC spectrometer and an energy-selecting device
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Dual-energy photon counting was performed using an energy-selecting device (ESD) and a detector, consisting of a Lu2(SiO4)O [LSO)] crystal and a multipixel photon counter (MPPC). The ESD is used to determine a low-energychannel range for CT and consists of two comparators and a microcomputer (MC). The two threshold channels in proportion to energies are determined using low and high-energy comparators, respectively. The MC in the ESD produces a single logical pulse when only a logical pulse from the low-energy comparator is input to the MC. To determine the high-energy-channel range for CT, logical pulses from the high-energy comparator are input to the MC outside the ESD. Logical pulses from the two MCs are input to frequency-voltage converters (FVCs) to convert count rates into voltages. The output voltages from the two FVCs are sent to a personal computer through an analog-digital converter to reconstruct tomograms. Dual-energy computed tomography was accomplished at a tube voltage of 70 kV and a maximum count rate of 14.3 kilocounts per second, and two-different-energy tomograms were obtained simultaneously.
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Eiichi Sato, Yasuyuki Oda, Satoshi Yamaguchi, Osahiko Hagiwara, Hiroshi Matsukiyo, Manabu Watanabe, and Shinya Kusachi "Dual-energy X-ray photon counting using an LSO-MPPC spectrometer and an energy-selecting device", Proc. SPIE 9594, Medical Applications of Radiation Detectors V, 95940F (27 August 2015);

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