1. A method for producing CT images of an examination object having a periodically moving subregion, comprising: scanning the examination object with the aid of at least one detector; detecting and storing scanned data regarding the moving subregion, usable for determining at least one rest phase; calculating axial tomograms from the detected and stored detector data of at least one rest phase; and assembling, by interpolative mixing, a total examination volume of the examination object in a rest phase section from axially calculated partial volumes so as to reduce step artifacts in a boundary region of the partial volumes; after the assembly of the total examination volume, including a multiplicity of axial original images with pixel values in a zone of the boundary regions of the partial volumes, limiting CT values in at least one image plane z to a prescribed value range with an upper and a lower bound, thus producing a result image D z ; carrying out a pixel-oriented median filtering on the result image D z , thus producing a result image M z ; calculating a differential value image F z calculated from the result images D z and M z ; applying a two-dimensional low pass filtering to the differential value image F z , thus producing a result image G z ; and subtracting the result image G z from the original image, and obtaining a final image E z .