Table 1.
Key imaging parameters for the 0.55 T fetal MRI protocol as implemented on a 0.55 T scanner
| Sequence | TR (ms) | TE (ms) | FA (deg) | BW (Hz/Px) | Slice thickness (mm) | Slice gap (mm) | Avg | Number of slices | FOV (mm2) | Acquisition matrix | Voxel size (mm3) | Partial Fourier | Acquisition time | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Per slice (s) | Total | ||||||||||||||
| HASTE | Body | 2000 | 98 | 180 | 251 | 3 | 0 | 1 | 30 | 350 × 350 | 224 × 224 | 1.6 × 1.6 × 3.0 | 4/8 | 2.0 | 1:00 |
| Brain | 2000 | 98 | 180 | 251 | 3 | 0 | 1 | 30 | 300 × 300 | 224 × 224 | 1.3 × 1.3 × 3.0 | 4/8 | 2.0 | 1:00 | |
| bSSFP | Body | 6.02 | 3.01 | 120 | 250 | 3 | 0 | 1 | 30 | 350 × 350 | 192 × 192 | 1.8 × 1.8 × 3.0 | None | 1.5 | 0:45 |
| Brain | 6.02 | 3.01 | 120 | 250 | 3 | 0 | 1 | 30 | 300 × 300 | 192 × 192 | 1.6 × 1.6 × 3.0 | None | 1.5 | 0:45 | |
| Real-time cine | 570 | 1.82 | 70 | 558 | 10 | - | 1 | 1 | 350 × 350 | 128 × 128 | 2.8 × 2.8 × 10 | None | 0.6 | - | |
| T1w GRE | 113 | 2.43 | 60 | 250 | 4 | 0 | 1 | 20 | 295 × 350 | 138 × 192 | 1.8 × 1.8 × 4.0 | None | - | 0:16 | |
| DWI (b = 0.700) | 2500 | 74 | - | 1510 | 4 | 0 | 1 | 20 | 294 × 330 | 82 × 92 | 3.6 × 3.6 × 4.0 | 6/8 | - | 0:30 | |