Patent ID: 8189736

Claim:
An X-ray CT apparatus including: a pair of an X-ray tube and a detector configured to irradiate X-rays to an object to be examined and to detect the X-rays transmitted through the object; scanner rotation means to which the pair of the X-ray tube and the detector is mounted, configured to rotate around the object; multi-energy scanning planning means configured to execute CT scanning of the same slice position of the object with the X-rays having different X-ray energies; and X-ray control means configured to control the irradiation of the X-rays having different energies from the X-ray tube, characterized in further comprising: means configured to continuously executing a first CT scanning using a first X-ray energy and a second CT scanning using a second X-ray energy without interrupting the CT scanning; means configured to transit the X-ray energy irradiated from the X-ray tube from the first X-ray energy to the second X-ray energy during transition period including the ending of the first CT scanning and the beginning of the second CT scanning; and means configured to execute image reconstruction by compensating the scan data of the transition period using the scan data of the remaining period.