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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: IEEE Trans Med Imaging. 2013 Apr 30;32(8):10.1109/TMI.2013.2260763. doi: 10.1109/TMI.2013.2260763

Fig. 6.

Fig. 6

Illustration of interactive LOGISMOS-based refinement of an automatically generated IVUS segmentation. This case was previously depicted in Fig. 1. (a) The user inspects the IVUS segmentation produced by our automated approach and discovers a local segmentation inaccuracy of the inner (arrow 1) and outer (arrow 2) surfaces. The outer boundary segmentation got “distracted” by a high density (calcified) region inside of the vessel wall and the associated shadow. (b) The user roughly indicates the correct location of the outer wall by drawing a polygon line (arrow 3, purple line) in proximity to the desired surface location. This single polygon line is used to locally modify the cost function for the outer boundary. (c) Refinement result after recalculating the maximum-flow for the dual-surface graph. Note that outer (arrow 4) and inner boundary (arrow 5) are simultaneously corrected due to the mutually interacting dual-surface graph structure. (d) Corresponding independent standard.