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On the left graph, the blue solid curves are prostate contours in the three key slices selected at the base, mid-gland and apex of the prostate. The blue dots are manually labelled markers. The red dotted lines are the true boundary of the prostate. The red dots on the red dotted lines are obtained using the interpolation of the corresponding blue dots in the 3D space. On the right graph, the red solid curve is the core shape, which is fitted based on the interpolated red dots.
