FIG. 3.

(a) First digital phantom test of surface registration (the sample source surface was created by transforming the target surface with known transformation parameters); (b) Second digital phantom test of surface registration (the target surface is contoured from a patient’s planning CT and the source surface is created by truncating and transforming the target surface); (c) The digital phantom test of volumetric registration—the unmatched parts marked by arrows before the registration (left) were successfully matched after the volumetric registration (right).