Table 2. MR sequence parameters.
| SWI sequence parameters | 3T | 7T | 7T HR |
|---|---|---|---|
| TR [ms] | 28 | 29 | 29 |
| TE [ms] | 20 | 15 | 15 |
| flip angle [°] | 15 | 15 | 15 |
| bandwidth [Hz/pixel] | 120 | 160 | 160 |
| matrix [Base x Phase] | 320 x 272 | 320 x 320 | 896 x 896 |
| acquired voxel size [mm3] | 0.70x0.80x2.6 | 0.70x0.70x2.0 | 0.25x0.25x1.5 |
| interpolated voxel size [mm3] | 0.70x0.70x2.0 | 0.70x0.70x2.0 | 0.25x0.25x1.5 |
| number of slices | 80 | 80 | 104 |
| GRAPPA factor (reference lines) | 2 (24) | 2 (48) | 2 (48) |
| acquisition time [min:sec] | 4:03 | 4:10 | 13:34 |
Abbreviations: GRAPPA = Generalized Autocalibrating Partially Parallel Acquisition; Hz = hertz; HR = high spatial resolution; ms = milliseconds; min = minutes, mm = millimeter; sec = seconds; T = Tesla; TE = echo time; TR = repetition time;° = degree