X-ray computed tomography system using a multipixel photon counter
2008
A photon-counting K-edge x-ray Computed Tomography (CT) system is useful for discriminating photon energy and for
decreasing absorbed dose for patients. The CT system is of the first generation type and consists of an x-ray generator, a
turn table, a translation stage, a two-stage controller, a multipixel photon counter (MPPC) module, a 0.5-mm-thick
zinc oxide (ZnO) scintillator, a counter board (CB), and a personal computer (PC). Tomography is accomplished by
repeating the translation and rotation of an object. Penetrating x-ray photons from the object are detected by the
scintillator in conjunction with the MPPC module, and the event signals are counted by the CB. Without using energy
discriminating, photon counting CT was carried out by controlling x-ray spectra.
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