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. Author manuscript; available in PMC: 2011 Aug 19.
Published in final edited form as: Inf Process Med Imaging. 2011;22:61–72. doi: 10.1007/978-3-642-22092-0_6

Fig. 2.

Fig. 2

An example 2-D slice from a 3-D image. (a) The terrain-like surface ST and the region of arbitrary shape RA, ST (p) = 2, ST (q) = 3. (b) Incorporation of the interaction constraint that the region RA tends to be positioned “lower” than the terrain-like surface ST . For voxels v ∈ RA and ST (p) − z(v) < d (yellow voxels), a penalty wv is given; d is set as 1. (c)The interaction constraint that RA tends to be positioned “higher” than ST . For voxels v ∈ RA(lv = 1) and z(v) − ST (p) < d (yellow voxels), penalty wv is given; d is set as 1.