MR imaging acquisition parameters
| Sequence | GRE | GRE | SWI | SWI | GRE | SWI |
|---|---|---|---|---|---|---|
| Field strength (Tesla) | 1.5 | 1.5 | 1.5 | 1.5 | 3.0 | 3.0 |
| Section thickness (mm) | 5 | 1.5 | 5 | 1.3 | 5 | 1.2 |
| Gap between sections (mm) | 1 | 0.3 | 0 | 0 | 0 | 0 |
| In-plane resolution (mm) | 0.9 × 0.9 | 0.7 × 0.7 | 0.9 × 0.9 | 0.7 × 0.7 | 1.15 × 1.15 | 0.5 × 0.5 |
| Acquisition time (min) | 3.5 | 11 | 2.5 | 8.5 | 2.5 | 9 |
| TR (ms) | 750 | 763 | 48 | 48 | 750 | 27 |
| TE (ms) | 24 | 24 | 40 | 40 | 25 | 21 |
| Flip angle (degrees) | 30 | 30 | 20 | 20 | 15 | 15 |
| Number of averages | 2 | 2 | 1 | 1 | 2 | 1 |
| Acquisition matrix | 256 × 144 | 320 × 216 | 256 × 171 | 320 × 214 | 192 × 192 | 448 × 299 |
| FOV (mm) | 230 × 130 | 224 × 151 | 230 × 130 | 224 × 150 | 221 × 221 | 224 × 150 |
Note:—GRE indicates gradient recalled-echo; SWI, susceptibility-weighted imaging.