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Segmentation of a 3D Brain Cortical Surface Using Watersheds

Segmentation of a 3D Brain Cortical Surface Using Watersheds. Kathleen Marty 12/10/02. Problem Statement. How can the cortical surface of the brain be segmented into “meaningful” areas? Anatomy: sulci and gyri. Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.

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Segmentation of a 3D Brain Cortical Surface Using Watersheds

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  1. Segmentation of a 3D Brain Cortical Surface Using Watersheds Kathleen Marty 12/10/02

  2. Problem Statement • How can the cortical surface of the brain be segmented into “meaningful” areas? Anatomy: sulci and gyri Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.

  3. General labeling division between sulci and gyri Specific labeling of individual sulci “Meaningful” Areas Defined White->sulci, Black->gyri Colors->sulci, White->gyri

  4. Motivation • Why segment the cortical surface? • Obtain correspondences between brain models to compare them (i.e. registration) • Visualization

  5. Segmentation Using Watersheds • Idea: Simulate rain falling. Each drop eventually descends into a “catchment basin.” • Watersheds: the ridges between the catchment basins • Each catchment basin corresponds to a different labeling Watershed Catchment Basins

  6. Visualize Watersheds on a Cortical Surface Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.

  7. Watersheds Algorithm • Sorting Step • Define each point by a height function • i.e. curvatures, geodesic/shortest distance from point to outside surface, etc. • Flooding Step • Each local minima is the base of a catchment basin • Flood the catchment basins based upon given height function to obtain labeling

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