Fig. 1.

Prostate irradiation example. Left: ROI definition (white rectangle) for the chamfer match and the first step of the dual registration tool. Right: mask (red full contour) used in the second step of the dual registration tool. The yellow contour corresponds to the bladder, the brown to the rectum and the blue around the brown contour is the PRV rectum. The points in blue inside the mask are the fiducial markers. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)