Investigation of a high-count-rate energy-dispersive X-ray CT system using a CdTe detector and a high-speed comparator and its application to iodine K-edge imaging

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An energy-dispersive X-ray computed tomography (ED-CT) system is useful for carrying out monochromatic imaging. To perform ED-CT, we developed an oscillation linear cadmium telluride (CdTe) detector with a scan velocity of 25mm/s and an energy resolution of 5keV. CT is performed by repeated linear scans and rotations of an object. Penetrating X-ray photons from the object are detected by the CdTe detector, and event signals of X-ray photons are produced using charge-sensitive and shaping amplifiers. The lower photon energy is determined by a comparator device, and the maximum photon energy of 60keV corresponds to the tube voltage. Logical pulses from the comparator are counted by a counter card. For the ED-CT, the tube voltage and the current were 60kV and 0.40mA, respectively, and X-ray intensity was 16.7µGy/s at 1.0m from the source. The minimum X-ray exposure time was 5min, and demonstration of enhanced iodine K-edge X-ray CT was carried out by selecting photons with energies ranging from 35 to 60keV.
医用画像情報学会の論文