Table 1. Imaging parameters for reference and 3D multi-contrast sequences.
| Parameters | Reference | 3D | |||||
|---|---|---|---|---|---|---|---|
| T1-TSE | T2-TSE | 3D-MPRAGE | 3D-MERGE | T2-VISTA | SNAP | ||
| FOV (mm3) | 140×140×32 | 160×160×48 | 250×160×40 | ||||
| Resolution (mm3) | 0.6×0.6×2 | 0.8×0.8×0.8 | |||||
| TE (ms) | 10 | 50 | 5.3 | 4.2 | 255/86† | 4.5 | |
| TR (ms) | 800 | 4,800 | 8.8/609‡ | 9 | 2,500 | 10/1,987§ | |
| TI (ms) | N/A | N/A | 304 | N/A | N/A | N/A | |
| Flip angle (deg) | 90 | 90 | 15 | 6 | Variable | 11/5¶ | |
| Turbo factor | 10 | 12 | 32 | 90 | 130 + 4# | 98 | |
| Signal acquisitions | 1 | 2 | 1 | 2 | |||
| Scan time | 6:11 | 3:50 | 2:28 | 3:10 | 4:32 | 6:47 | |
†, Effective echo time/Equivalent echo time. ‡, TR for one inversion cycle. §, SPGR repetition time/inversion recovery repetition time (IRTR). ¶, flip angle used in IR/reference acquisition. #, Number of echoes in each shot for acquisition start-up. T1-TSE, T1-weighted turbo spin echo; T2-TSE, T2-weighted turbo spin echo; 3D-MPRAGE, three-dimensional magnetization-prepared rapid acquisition gradient-echo; 3D-MERGE, 3D motion-sensitized driven equilibrium prepared rapid gradient echo; T2-VISTA, T2-weighted volumetric isotropic turbo spin echo acquisition; SNAP, simultaneous non-contrast angiography and intraplaque hemorrhage; FOV, field of view; TE, echo time; TR, repetition time; TI, inversion time.