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| == Pre-processing ==
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| * Continuous switching anistropic diffusion
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| * Vessel enhancement filtering (multi-scale) by Frangi
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| == Object segmentation ==
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| * Pixel
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| ** Intensity, multivariate intensity
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| * Atlas-based
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| ** Register and refine contours
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| * Region growing / active contours
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| ** Level sets, connected component, ...
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| ** What methods are in Slicer?
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| == Data structures ==
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| == Tube extraction ==
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| === Categories ===
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| # Pixel-based
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| #* intensity, gradient magnitude, dot product of gradient and the eigenvectors of the hessian, ratios of eigenvalues of the hessian, ...
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| # Region growing / level-set
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| #* Geodesics
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| #* Connected components
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| #* Active contours
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| # Tracking / cross-sectional geometry
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| #* Intensity ridge
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| #* Probability ridge
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| #* Match filter
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| # Atlas / fitting techniques
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| #* VMTK (given endpoints, find lowest-cost path), linear programming,
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| === Papers ===
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| * "A VTK-based, CUDA-optimized Non-Parametric Vessel Detection Method"
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| ** http://www.midasjournal.org/browse/publication/710
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