| Deletions are marked like this. | Additions are marked like this. |
| Line 2: | Line 2: |
|
== Motivation == Why do we need to fix topological defects? * Non-unique mapping to sphere Why do topological defects occur? * Segmentation errors * Fill errors == Manual == * Holes * WM classified as non-WM * Fix by filling * Example: filling ventricle * Handles * non-WM classified as WM * Fix by cutting * Example: removing optic nerve * (Other areas: fornix, basal ganglia, temporal strands) == Automatic == |
Fixing Common Topological Defects
Motivation
Why do we need to fix topological defects?
- Non-unique mapping to sphere
Why do topological defects occur?
- Segmentation errors
- Fill errors
Manual
- Holes
- WM classified as non-WM
- Fix by filling
- Example: filling ventricle
- Handles
- non-WM classified as WM
- Fix by cutting
- Example: removing optic nerve
- (Other areas: fornix, basal ganglia, temporal strands)