From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
Recently, the photon counting X-ray imaging / CT systems have been researched and investigated as a next generation imaging system. CdTe has high attenuation coefficient at hard X-ray (100keV<) for medical imaging system, and photon counting signal processing has very high sensitivity in theoretic. We have demonstrated the photon counting X-ray imaging / CT system by CdTe detectors. The high-contrasted CT images of acryl phantom were taken by this system. In this case, very low power X-ray source (150kV, 1.8uA) was used. CT images could not be reconstructed at low exposure condition less than 9.0uAs in this protocol using traditional CdTe detector, but we could obtain good images by using photon counting CdTe detector even if the very low exposure of 1.8uAs. Photon-counting CT is very powerful technique for low exposure X-ray imaging / CT system.
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