Abstract
A photon-counting X-ray CT system consists of an X-ray generator, a turntable, a translation stage, a two-stage controller, a multipixel-photon-counter (MPPC) module, a 1.0 mm thick Lu 2(SiO 4)O (LSO) single crystal (scintillator), a counter card (CC) and a personal computer (PC). Tomography is accomplished by repeating the linear scan and the rotation of an object, and projection curves of the object are obtained by linear scan using the detector consisting of an MPPC module and an LSO scintillator. The pulses of the event signal from the module are counted by the CC in conjunction with the PC. The lower level of the photon energy is roughly determined by a comparator circuit in the module, and the unit of the level is the photon equivalent (pe). Thus, the average photon energy of the X-ray spectra for imaging increases with increasing pe value. The maximum count rate was approximately 10 Mcps, and the energy-discrimination CT was roughly carried out.
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