Abstract
High-speed photon counting is useful for discriminating photon energy and for decreasing absorbed dose for patients in medical radiography, and the counting is usable for constructing an X-ray computed tomography (CT) system. A photon-counting X-ray CT system consists of an X-ray generator, a turntable, an oscillation linear sensor, a two-stage controller, a multipixel-photon-counter (MPPC) module, a 1.0-mm-thick crystal (scintillator) of cerium-doped yttrium aluminum perovskite [YAP(Ce)], a counter card (CC), and a personal computer (PC). Tomography is accomplished by repeating the linear scanning and the rotation of an object, and projection curves of the object are obtained by the linear scanning using the detector consisting of a MPPC module and the YAP(Ce). The pulses of the event signal from the module are counted by the CC in conjunction with the PC. Because the lower level of the photon energy was roughly determined by a comparator circuit in the module, the average photon energy of the X-ray spectra increased with increasing the lower-level voltage of the comparator. The maximum count rate was approximately 3 Mcps, and photon-counting CT was carried out.
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