Table 1.
Sequence parameters.
| DTI | T2-Relaxometry | T2w | |
|---|---|---|---|
| Repetition time (TR) | 3990 ms | 2400 ms | 8150 ms |
| Echo time (TE) | 72 ms | 12 echoes (10, 20, …, 120 ms) | 54 ms |
| Field of view (FOV) | 178 × 178 mm2 | 160 × 160 mm2 | 160 × 160 mm2 |
| Matrix | 102 × 128 | 338 × 334 | 512 × 333 |
| Slice thickness | 3.0 mm | 3.5 mm | 3.5 mm |
| Number of slices | 18 | 11 | 41 |
| Slice gap | 0.3 mm | None | 0.35 mm |
| Number of averages | 1 | 1 | 2 |
| Parallel imaging | GRAPPA | None | GRAPPA |
| Acceleration factor | 2 | n.a. | 2 |
| Refocusing flip angle | 180° | 180° | 150° |
| Bandwidth | 930 Hz/px | 190 Hz/px | 181 Hz/px |
| Acquisition time per slab | 8:36 min | 6:43 min | 3:56 min |
| Fat saturation | Spectral fat saturation | Spectral fat saturation | Spectral fat saturation |
| Number of diffusion directions | 20 | n.a. | n.a. |
| b-values | 0 and 1000 s/mm2 | n.a. | n.a. |
Abbreviations: DTI, diffusion tensor imaging; T2w, T2-weighted sequence; GRAPPA, generalized autocalibrating partial parallel acquisition.