Patent ID: 8755565

Claim:
An X-ray CT apparatus which includes an X-ray generator and an X-ray detector for acquiring projection data of an object from a plurality of angles and creates an arbitrary cross-sectional image of the object on the basis of the projection data, the X-ray CT apparatus comprising: an extraction section which extracts a region, which includes a target organ moving periodically, from the cross-sectional image; a synchronous phase determination section which determines a synchronous phase, which is used when creating a synchronous cross-sectional image synchronized with periodic motion of the target organ, on the basis of continuity of the target organ in a direction perpendicular to the cross-sectional image; a synchronous cross-sectional image creating section which creates the synchronous cross-sectional image on the basis of projection data corresponding to the synchronous phase determined by the synchronous phase determination section; and a display unit which displays the synchronous cross-sectional image.