Patent ID: 7298813

Claim:
An X-ray computed tomographic apparatus comprising: a gantry unit, which includes a detector with a plurality of X-ray detection element rows along a slice direction and an X-ray tube, and acquires projection data from a subject by helical scanning; an extraction unit which extracts a first projection data set corresponding to a first heartbeat period or a first respiratory period of the subject, and a second projection data set corresponding to a second heartbeat period or a second respiratory period of the subject from the acquired projection data, each of the first projection data set and the second projection data set covering an angle range required for reconstruction of one frame of an image; a weighting processing unit which weights each of the extracted first projection data set and the extracted second projection data set with a weight corresponding to a data acquisition position, wherein the weights depend on a center of a range in which the first projection data set and the second projection data set are prepared by interpolation from the projection data; a combining processing unit which combines the weighted first projection data and the weighted second projection data to generate a third data set; and a reconstruction processing unit which reconstructs an image data set on the basis of the generated third data set.