1. A method for preparing an appraisal of tomographic colon pictures, in particular of CT or MR pictures of the colon, comprising: conducting a manual personal search during which detected lesions of the tomographic colon pictures are confirmed; conducting a search for lesions via a computer, if appropriate with automatic preliminary confirmation, the computer aided preliminary confirmations being manually rechecked; and excluding lesions that have already been classified as known and confirmed, after a comparison with a set of the lesions already detected manually, from the set of lesions detected with computer assistance and that are to be presented again for personal confirmation.