1. A method for the formation of a selective rendering of body structures of an object to be examined from a primary image data set, which method comprises the steps of: combining a plurality of pixels so as to form at least one pixel group (BG 1 -BG 16 ) which comprises each time pixels which are associated with the pixel group in conformity with predetermined filter criteria, forming at least one pixel list by selection and/or deselection of at least one pixel group, forming a filtered secondary image data set in which the pixels of the pixel groups of the at least one pixel list formed are marked, and forming the rendering from the secondary image data set, the marked pixels being rendered separately, notably in highlighted or suppressed form.