An X-ray computed tomography apparatus includes a helical scanning device configured
to collect projection data while at least one of a gantry and a couch moves along
a body axial direction of an object on the couch when at least one of the gantry
and the couch is tilted, the helical scanning device including an X-ray source
configured to generate X-rays, and a detector disposed opposite the X-ray source
and having detector elements arranged in a plurality of rows along the body axial
direction, and a reconstructing device configured to reconstruct an image based
on the projection data using cone-beam Feldkamp reconstruction.
