Disclosed is a method for interpreting image data that represents variations in density of matter inside a subject. A data processing system receives image data from a scan of a subject. The data processing system automatically discerns one or more bones, one or more arteries, and one or more organs of the subject, based at least in part on the image data. The data processing system may also automatically identify one or more of the discerned bones, arteries, and organs. The data processing system may also automatically determine a branch point of one of the one or more arteries of the subject. The data processing system may also produce output that depicts one or more of the identified bones, one or more of the identified arteries, one or more of the identified organs, and/or or the outer or inner margin of the body wall. Other embodiments are described and claimed.
