1. Method of reconstructing an image of an object from volumetric data of the object, wherein the volumetric data include a plurality of projections corresponding to a plurality of time points, the method comprising the steps of: estimating a motion of the object; determining first time points where the motion of the object is minimal on the basis of the estimated motion of the object; and selecting projections from the plurality of projections on the basis of the first time points; and reconstructing the image from the projections selected from the plurality of projections.