Sequence parameters per pulse sequence at 7T
| 3D-DIR | 3D-FLAIR | 2D-T2WI | 3D-T1WI | |
|---|---|---|---|---|
| TSE | TSE | TSE | TFE | |
| TR (ms) | 8000 | 8000 | 4969 | 7.0 |
| TE (1/2) (ms) | 294 | 303 | 21/80 | 2.9 |
| TI (1/2) (ms) | 3150/550a | 2325 | - | 1129 |
| Flip angle (°) | 100 | 100 | 90 | 8 |
| Turbo factor (−) | 128 | 125 | 8 | 312 |
| Acquisition resolution (mm) | 1.0 × 1.0 × 0.8 | 0.8 × 0.8 × 0.8 (Sagittal) | 0.7 × 1.0 × 2.0 (Axial) | 0.8 × 0.8 × 0.8 (Sagittal) |
| Reconstructed resolution (mm) | 0.5 × 0.5 × 0.4 | 0.49 × 0.49 × 0.4 (Axial) | 0.45 × 0.45 × 2.0 (Axial) | 0.5 × 0.5 × 0.4 |
| Sensitivity encoding | 2.0 × 3.0 (AP×RL)b | 2.5 × 2.5 (AP×RL)b | 2.1 (RL) | 2.0 (RL) |
| Acquisition time (min/sec) | 11:04 | 13:06 | 8:07 | 9:43 |
Note:—TFE indicates turbo field echo; AP, anterior-posterior; LR, left-right.
↵a The long inversion time (TI1) is the interval between the first 180° inversion pulse and the 90° excitation pulse, and the short inversion time (TI2) is the interval between the second 180° inversion pulse and the 90° excitation pulse.
↵b Sensitivity encoding applied in 2D.