Summary of WM metrics
| Diffusion MR Imaging | Parameter | Explanation |
|---|---|---|
| DTI | FA | Overall direction of water diffusion in brain tissue |
| Mean diffusivity | The magnitude of isotropic diffusion in brain tissue | |
| Axial diffusivity | The coefficient of diffusion across the long axis of the ellipsoid | |
| RD | The coefficient of diffusion perpendicular to the long axis | |
| NODDI | Intracellular volume fraction | Neurite density based on intracellular diffusion |
| Orientation dispersion index | Dispersion of neurites in the intracellular compartment | |
| ISOVF | The measure of extracellular water diffusion |