1. A method of forming an isolated visualization of body structures from a 3D image data set, which method includes the steps of forming a binary data set in which all image elements present in the 3D image data set are subdivided into image elements to be visualized in isolated form and image elements which are not to be visualized, where a1. filtering of the image values is performed by means of limit values, and a2. all image elements of the binary data set of image structures contained in the b 3D image data set which are smaller than a predetermined size are selected, forming a filtered data set by entering the image values of the original 3D image data set for the image elements which are characterized as image elements to be visualized in isolated form in the binary data set, forming the visualization of the isolated body structure from the filtered data set.