Table 1. MR parameters for the three T1WI sequences.
| Parameters | MPRAGE | PETRA | DANTE-SPACE |
|---|---|---|---|
| Sequence type | T1 GRE | T1 PETRA | T1 TSE |
| 3D or 2D mode | 3D | 3D | 3D |
| Coverage | Whole brain | Whole brain | Whole brain |
| Orientation | Sagittal | Axial | Sagittal |
| TR (ms) | 2,300 | 3.32/2,250 | 850 |
| TE (ms) | 2.29 | 0.07 | 4.6 |
| FOV (mm2) | 240 | 300 | 280 |
| Bandwidth (Hz/pixel) | 200 | 401 | 524 |
| Number of slices | 176 | 320 | 192 |
| Matrix size | 256×256 | 320×320 | 298×298 |
| Acceleration factor in parallel imaging (GRAPPA mode) | 2 | – | 2 |
| Flip angle (°) | 8 | 6 | Variable |
| Voxel size (mm3) | 0.94×0.94×0.94 | 0.94×0.94×0.94 | 0.94×0.94×0.94 |
| TA | 5 min 21 s | 5 min 57 s | 5 min 33 s |
MR, magnetic resonance; T1WI, T1-weighted imaging; MPRAGE, magnetization-prepared rapid acquisition with gradient echo; PETRA, pointwise encoding time reduction with radial acquisition; DANTE-SPACE, delay alternating with nutation for tailored excitation sampling perfection with application-optimized contrasts using different flip angle evolution; GRE, gradient recalled echo; TSE, turbo spin echo; 3D or 2D mode, three-dimensional or two-dimensional mode; TR, repetition time; TE, echo time; FOV, field of view; GRAPPA, generalized auto calibrating partially parallel acquisition; TA, acquisition time.