Table 1.
MR parameters used for fetal imaging (1.5 T GE Healthcare)
| T2 ssFSE | 3D FIESTA | DWI | FLAIR | T1 | MOVIE | |
|---|---|---|---|---|---|---|
| Repetition time | Minimum (2000) | Minimum (4.4) | 4000 | Minimum (2700) | Minimum (6.2) | 4.6 |
| Time to echo | 120 | Minimum (4.4) | Minimum | 122 | Minimum (303) | 3 |
| Flip angle | – | 60 | – | – | 45 | 45 |
| Bandwidth (KHz) | 37 | 125 | 250 | 41 | 31 | 166 |
| Inversion time | – | – | – | 2000 | – | – |
| Prep time | – | – | – | – | 2000 | – |
| NEX | 1 | 0.75 | 4 | 0.5 | 1 | 1 |
| Slice thickness/slice gap (mm) | 4/0 | 2.0–2.6/0 | 4/0.5 | 4/0.4 | 4/0 | 18 |
| Field of view (mm) (adjusted to patient) | 320 x 320 | 320 × 260 | 400 × 360 | 380 × 323 | 480 × 480 | |
| Freq/phase matrix | 256/256 | 320/256 | 128/128 | 192/128 | 192/256 | |
| Reconstructed voxel size (mm) | 0.5 x 0.5 x 4 | 06 × 0.5 × 1–1.3 | – | – | – | – |
| B value | 600–800 | – | ||||
| Approx. scan time (secs) | 32 | 21 | 64 | 54 | 51 | 50 |