Table 1.
3D T1-weighted fat-suppressed (FS) pulse sequence parameters
| Sequence description | Bilateral | Standard resolution | High resolution | ||
|---|---|---|---|---|---|
| Field strength (T) | 7 | 3 | 7 | 3 | 7 |
| FS method | SPAIR | Saturation | SPAIR | Saturation | SPAIR |
| TE (ms) | 1.9 | 1.47 | 2.14 | 1.78 | 2.75 |
| TR (ms) | 4.2 | 3.78 | 4.52 | 4.39 | 5.36 |
| Nominal flip angle (°) | 10* | 12 | 5–10* | 12 | 5* |
| Bandwidth (Hz/pixel) | 540 | 543 | 545 | 539 | 540 |
| FS lines per shot | 100 | 40 | 60 | 224 | 100 |
| Acquisition time (s) | 181 | 71 | 119 | 324 | 390 |
| Number of slices | 144 | 144 | 144 | 224 | 208 |
| Field-of-view (mm2) | 310 × 310 | 190 × 190 | 190 × 190 | 190 × 190 | 190 × 190 |
| Acquisition matrix | 288 × 288 | 176 × 176 | 174 × 174 | 320 × 320 | 320 × 320 |
| Acquired voxel size (mm3) | 1.1 × 1.1 × 1.1 | 1.1 × 1.1 × 1.6 | 1.1 × 1.1 × 1.6 | 0.6 × 0.6 × 0.6 | 0.6 × 0.6 × 0.6 |
| Parallel imaging acceleration | 2 | 1 | 1 | 1 | 1 |
SPAIR spectrally selective adiabatic inversion recovery
*
7-T flip angles were calibrated in the peripheral fat tissue to ensure efficacy of the SPAIR module. The flip angle in the centre of the breast is expected to be approximately 25% greater.