1. A system for generating an anatomical atlas, the system comprising: a computer processor configured to: using a common anatomical atlas for a plurality of patients of a patient population, perform a respective registration of the common anatomical atlas for each of the plurality of patients of the patient population to obtain a respective patient-population anatomical atlas; register each of the respective patient-population anatomical atlases to an anatomical image of a current patient to obtain a respective patient-specific anatomical atlas; and determine an average of the patient-specific anatomical atlases to obtain an average patient-specific anatomical atlas.