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. Author manuscript; available in PMC: 2014 Jul 28.

Published in final edited form as: IEEE Trans Med Imaging. 2013 Jul 25;32(11):2114–2126. doi: 10.1109/TMI.2013.2274777

Fig. 2 — Sliding boundary normals n(x) and weights w(x). (a) Example surface models and associated normals extracted using image segmentation, which are subsequently discretized onto the image grid using nearest neighbors interpolation; (b) Example slice through the weight image w(x). At sliding boundaries, w(x) ≈ 1 and sliding motion may occur, while inside organs w(x) ≈ 0 and all motion discontinuities should be penalized.

Fig. 2 — Sliding boundary normals n(x) and weights w(x). (a) Example surface models and associated normals extracted using image segmentation, which are subsequently discretized onto the image grid using nearest neighbors interpolation; (b) Example slice through the weight image w(x). At sliding boundaries, w(x) ≈ 1 and sliding motion may occur, while inside organs w(x) ≈ 0 and all motion discontinuities should be penalized.