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. Author manuscript; available in PMC: 2012 Feb 3.
Published in final edited form as: IEEE Trans Med Imaging. 2010 Sep 16;30(2):266–278. doi: 10.1109/TMI.2010.2076300

Fig. 8.

Fig. 8

(a) and (b) show local enlargements of trachea regions after applying the normal vector distribution based filtering to regions shown in Fig. 6(b) and Fig. 6(c); (c) and (d) show the airway set (A) and non-airway set (B) after applying the “puzzle game” operation to the regions in Fig. 6(b) and Fig. 6(c). The arrows indicate the “holes” or missing airway regions.