Patent ID: 8913711

Claim:
A photon counting type X-ray computed tomography apparatus comprising: an X-ray tube configured to produce an X-ray photon whose highest energy is higher than highest peak energy of characteristic X-rays; an X-ray detecting material configured to detect the X-ray photon; an attenuation coefficient map producing unit configured to produce a first attenuation coefficient map which corresponds to a first energy region including the highest peak energy of the characteristic X-rays; an attenuation coefficient map transforming unit configured to transform the first attenuation coefficient map into a second attenuation coefficient map of a second energy region which is different from the first energy region; a simulation performing unit configured to perform a simulation of scattered radiation on the basis of the second attenuation coefficient map so as to produce a scattered photon distribution of scattered X-ray photons; and an image reconstructing unit configured to produce data before reconstruction on the basis of the detected X-ray photon which corresponds to the second energy region, to correct and process the data before reconstruction with the scattered photon distribution so as to produce corrected data, and to reconstruct an image corresponding to the second energy region for which scattered radiation is corrected.