Mcps-range photon-counting x-ray computed tomography system
2011
10 Mcps photon counting was carried out using a detector consisting of a 2.0 mm-thick ZnO (zinc oxide) single-crystal
scintillator and an MPPC (multipixel photon counter) module in an X-ray computed tomography (CT) system. The
maximum count rate was 10 Mcps (mega counts per second) at a tube voltage of 70 kV and a tube current of 2.0 mA.
Next, a photon-counting X-ray CT system consists of an X-ray generator, a turntable, a scan stage, a two-stage
controller, the ZnO-MPPC detector, a counter card (CC), and a personal computer (PC). Tomography is accomplished
by repeated linear scans and rotations of an object, and projection curves of the object are obtained by the linear scan
with a scan velocity of 25 mm/s. The pulses of the event signal from the module are counted by the CC in conjunction
with the PC. The exposure time for obtaining a tomogram was 600 s at a scan step of 0.5 mm and a rotation step of 1.0°,
and photon-counting CT was accomplished using iodine-based contrast media.
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