1. A system for segmenting current diagnostic images comprising: one or more workstations which segment a volume of interest in previously generated diagnostic images of a selected volume of interest generated from a plurality of patients; one or more processors programmed to: register the segmented previously generated images, and merge the segmented previously generated images into a probability map which depicts a probability that each voxel represents the volume of interest, a probability that each voxel represents background, and a mean segmentation boundary; and, a segmentation processor which registers the probability map with a current diagnostic image of the volume of interest in a current patient to generate a transformed probability map.