A method, computer system and computer readable storage medium for searching for one or more images having a region of interest similar to the region of a subject, including: receiving imaging data comprising a plurality of image elements of the region of interest of the subject； segmenting the imaging data of the region of interest of the subject into a plurality of sub-regions corresponding to various structures at a plurality of levels of granularity, the plurality of levels of granularity having a relationship such that a level of granularity has fewer structures at a lower level of granularity； and calculating at each of the plurality of levels of granularity an abnormality factor or risk factor for the segmented various structures of said region of interest, to provide a segmented said region of interest of said subject with at least one of said abnormality factor or risk factor associated therewith.
