Table 3.
Acquisition parameters of MR sequences. n/a—not applicable, ax—axial, sag—sagittal, cor—coronal, mid-sag—mid-sagittal. *Indicates the total duration of all three sequences.
| PDW | T1 | T1ρ | T2 | T2* | |
|---|---|---|---|---|---|
| Sequence type | Turbo-spin echo (2D) | Inversion-recovery (2D) | Spin-lock multi-gradient echo (3D) | Multi-spin echo (2D) | multi-gradient echo (2D) |
| Orientation | ax, sag, cor | mid-sag | sag | mid-sag | mid-sag |
| Repetition time (ms) | 1,500 | 3,000 | 30 | 1,500 | 700 |
| Echo time (ms) | 11.2 | 10.1 | 3.8 | n × 8.4 (n = 1–12) | 3.3 + n × 5.2 (n = 0–14) |
| Turbo spin-echo factor | 6 | 5 | 44 | 12 | 15 |
| Field of view (mm) | 62 × 62 | 62 × 62 | 52 × 52 | 52 × 52 | 52 × 52 |
| Acquisition matrix | 144 × 142 | 224 × 220 | 176 × 176 | 176 × 176 | 176 × 176 |
| Reconstruction matrix | 256 × 256 | 224 × 224 | 224 × 224 | 224 × 224 | 224 × 224 |
| Flip angle (°) | 90 | 90 | 11 | 90 | 90 |
| Number of signal averages | 2 | 1 | 4 | 2 | 3 |
| Slices | 10 | 1 | 7 | 1 | 1 |
| Slice Thickness / Gap (mm) | 1.0 / 0.5 | 2.0 / n/a | 3.2 | 2.0 / n/a | 2.0 / n/a |
| Inversion times (ms) | n/a | 150, 300, 500, 800, 1,000, 1,500 | n/a | n/a | n/a |
| Spin-lock durations (ms) | n/a | n/a | 0, 10, 20, 30, 40 | n/a | n/a |
| Duration (min:s) | 7:03 (*) | 7:12 | 14:30 | 4:29 | 03:08 |