Table 2. Sodium MRI sequence details.
| Sodium MR Sequence | ||
|---|---|---|
| Average tissue sodium MRI signal* | Fluid-attenuated sodium MRI signal** | |
| Echo Time (TE) | 0.35 ms | 0.75 ms |
| Repetition Time (TR) | 160 ms | 185 ms |
| Readout Duration (TRO) | 10 ms | 16.7 ms |
| Inversion Time (TI) | — | 41 ms |
| Nominal Spatial Resolution | 3.0 × 3.0 × 3.0 mm3 | 4.4 × 4.4 × 4.4 mm3 |
| Acquisition Time | 10 min 4 s | 9 min 52 s |
*We minimized relaxation weighting by a short TE and a long TR; **We measured the fluid-attenuated sodium signal using an inversion recovery sequence which suppresses signal of sodium ions with long relaxation times as, for example, in cerebro-spinal fluid.