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Distances between two clinical target volumes from two head-and-neck treatment plans are measured. Distances between contours are displayed in a color map after rigid-body image registration and smoothing. (a) 3D CTV structures from the head-and-neck case. Two 3D head-and-neck cases are reconstructed from the first and second plans. (b) BLD measure and (c) ND measure. The maximum distance measured by BLD measure is 17 mm, but ND measure reported the maximum distance of 32 mm.
