1. An image registration apparatus comprising: a diagnostic volume image memory ( 12 ) which receives a 3 or higher dimension diagnostic volume image of a target area generated by a scanner ( 10 ); a lower resolution volume image memory ( 20 ) which stores a 3 or higher dimension lower resolution volume image of the target region; a localizer and registration unit ( 30 ) which determines a baseline transform (T base ) that brings the 3 or higher dimension diagnostic volume image and the 3 or higher dimension lower resolution volume image of the target area into registration; and, an image adjustment processor ( 32 ) which adjusts at least a selected portion of the diagnostic volume image in accordance with the baseline transform (T base ).