Patent ID: 8731267

Claim:
An X-ray computed tomography apparatus comprising: an X-ray tube configured to generate X-rays; an X-ray detector configured to detect X-rays which are generated by the X-ray tube and transmitted through a subject; a support mechanism configured to rotatably support the X-ray tube and the X-ray detector; a control unit configured to control the support mechanism to rotate the X-ray tube and the X-ray detector; an acquisition unit configured to acquire projection data associated with the subject via the X-ray detector; an intermediate image generating unit configured to extract a full projection data set from the acquisition unit which contributes to image reconstruction of a reconstruction slice, generate a first intermediate image using the data in the full projection data set, the full projection data set having a first view angle range, and generate a second intermediate image based on a second projection data set, the second projection data set being less than an entire portion of the full projection data set and having a second view angle range narrower than the first view angle range; a weighting factor calculating unit configured to calculate a weighting factor corresponding to a pixel value difference between the first intermediate image and the second intermediate image; and a resultant image generating unit configured to generate a resultant image associated with weighted addition of the first intermediate image and the second intermediate image based on the weighting factor.