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. Author manuscript; available in PMC: 2019 Mar 26.
Published in final edited form as: IEEE Trans Med Imaging. 2018 Mar;37(3):693–702. doi: 10.1109/TMI.2017.2769640

Fig. 4.

Fig. 4.

An example of Signed Euclidean distance (SED) map calculation based on a binary mask (BM). In SED, voxels with positive values are the regions where structures exist and voxels with negative values are the free regions. The voxels outside the lung lobe is set to be not a number (NaN).