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Cortical flattening for Visualization

Cortical flattening for Visualization. Presentation by Chetan Bhole. [4]. Structural 2D slice of brain (MRI). White matter. gray matter Or cortex. skull. Note On: Functional imaging Importance of cortex. Segmentation of the cortex. Normalization Skull Strip Segmentation.

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Cortical flattening for Visualization

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  1. Cortical flattening for Visualization Presentation by Chetan Bhole [4]

  2. Structural 2D slice of brain (MRI) White matter gray matter Or cortex skull • Note On: • Functional imaging • Importance of cortex

  3. Segmentation of the cortex • Normalization • Skull Strip • Segmentation

  4. Previous visualization methods2D

  5. Previous visualization methods3D

  6. Cortical flattening • Flatten and unfold the cortex • Use of boundary between white and gray matter • Requirements • Minimal folding • Minimal metric distortion

  7. Cortical flattening: I Find the geodesic distances between points in a cut Minimize Energy fn: J = λdJd + λaJa

  8. Results Map to flat surface Map to spherical surface Inflation: wrt mean curvature Inflation: wrt convexity

  9. Spherical coordinate system • Comparing information across patients

  10. Cortical flattening: II choose points draw mesh adjust distances result map on flat surface Perform Delanauy triangulation

  11. Results

  12. References • Cortical Surface Based Analysis, I: Segmentation and Surface Reconstruction, Anders Dale, Bruce Fischl, Martin Sereno 1998 • Cortical Surface Based Analysis, II: Inflation, Flattening and a Surface-Based Coordinate System, Bruce Fischl, Martin Sereno, Anders Dale, 1998 • Visualization and Measurement of the Cortical Surface, Brian Wandell, Suelika Chial, Benjamin Backus, 2000 • http://vision.psy.mq.edu.au/~peterw/corella/315/fMRI.part2.pdf

  13. Thanks!!

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