Table 1.
Compartmental Properties
| Compartment | T2 (ms) | Proton Density (ρ) | χ isotropic (ppb) | χ anisotropic (ppb) |
|---|---|---|---|---|
| Intra‐axonal | 50 | 1 | 0 | 0 |
| Extra‐axonal | 50 | 1 | 0 | 0 |
| Myelin | 15 | 1/2 | −60 | −120 |
Isotropic and anisotropic magnetic susceptibility values were based on model estimates in the study by Wharton and Bowtell 14. A proton density value of 0.5 was based on the known water content of different WM compartments 43. T2 values for intra‐axonal, extra‐axonal, and myelin water were based on the study by Peters et al. 44, which is in fair agreement with estimates from recent work 4, 14.