A system is disclosed for assessing or depicting the degree of bone fusion in an area. The system involves receiving three dimensional image data from a patient of a portion of a patient's body. Using the data, the scanned portion of the patient's body is reconstructed. The system permits a user to select a volume within the reconstructed volume which defines a volume of interest. The density of each voxel is detected within the volume of interest. An analysis is conducted on the voxel densities to determine the amount of fusion that has occurred, the higher the density in a prescribed area the greater the amount of fusion that has occurred. The system generates a depiction of the density.
