Table 3.
The parameter descriptions corresponding to the diffusion compartment models in Table 2.
| Parameter | Compartments | Usage |
|---|---|---|
| d∥ (or d) | Tensor, Ball, Stick, NODDI_in, NODDI_ex, CHARMED_in | Parallel diffusivity along the primary direction of diffusion n |
| d⊥1 | Tensor | Perpendicular diffusivity, perpendicular to both d∥ and d⊥2. |
| d⊥2 | Tensor | Perpendicular diffusivity, perpendicular to both d∥ and d⊥2. |
| θ | Tensor, Stick, NODDI_in, NODDI_ex, CHARMED_in | Polar angle used to parameterize n, the primary direction of diffusion |
| ϕ | Tensor, Stick, NODDI_in, NODDI_ex, CHARMED_in | Azimuth angle used to parameterize n, the primary direction of diffusion |
| ψ | Tensor | Used to rotate the Tensor around its primary axis |
| κ | NODDI_in, NODDI_ex | The dispersion index of the Watson distribution |