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