TABLE 1.
Common imaging parameters for the in vivo 2D and 3D T1ρ mapping experiments
| Parameter | 2D mapping | 3D mapping |
|---|---|---|
| Orientation | Axial | Sagittal |
| Phase-encoding directions | R/L | A/P and R/L |
| FOV (cm) | 22 × 22 | 24 × 24 × 16 |
| Sampling matrix | 256 × 256 | 256 × 128 × 80 |
| Slice thickness (mm) | 10 | 2 |
| TR/TE (ms) | 8.5/3.8 | 6.8/2.95 |
| Bandwidth (Hz/px) | 260 | 260 |
| Fat saturation | Yes | Yes |
| GRAPPA acceleration | None | Table 2 |
| VPS | 32, 64, 128, 256 | Table 2 |
| No CSF nulling: Trec (ms) | 2500 | Table 2 |
| CSF nulling: TIprep/TEprep/TI (ms) | 1350/200/940 | Table 2 |
| TSLs (ms) | 0, 20, 40, 60, 80 | Table 2 |
| Spin-lock pulse amplitude (Hz) | 350 | 350 |
| Assumed brain tissue T1 (ms) | 1200 | 1200 |
| Assumed brain tissue T2 (ms) | 70 | 70 |
| Assumed brain tissue T1ρ (ms) | 75 | 75 |