1. A method for generating a model of an anatomical structure using scan data from a plurality of subjects, the method comprising: collecting a set of scan data comprising scan data of the anatomical structure for each of the plurality of subjects; applying an edge detector to the set of scan data for each of the plurality of subjects to generate sets of edges; converting the sets of the edges into a common reference system; accumulating the sets of the edges in the common reference system to form a probability map; displaying the probability map; fitting curves or surfaces to the probability map to select representative edge portions to define the model of the anatomical structure.