Table 1.
2D Phase Sensitive Inversion Recovery (PSIR), 3D T1‐w, and 2D T2*‐w Protocol Parameters
| 2D PSIR | Siemens | Philips | GE |
|---|---|---|---|
| Sequence name | CV | T1‐TFE | PSMDE |
| Dimension | 2D | 2D | 2D |
| TR (msec) | 4000 | 9.5 | 8.00 |
| TE (msec) | 3.22 | 4.7 | 3.76 |
| TI (msec) | 400 | 300 | 400 |
| # averages | 3 | 5 | 20 |
| Shots | 9 | 10 | 52 |
| Segments | 26 | 24 | 4/5 |
| Flip angle (deg) | 10 | 15 | 25 |
| Voxel sixe (mm) | .78 × .78 × 5 | .78 × .78 × 5 | .78 × .78 × 5 |
| Field of view (mm) | 200 × 200 × 5 | 200 × 200 × 5 | 200 × 200 × 5 |
| BW(Hz/Px) | 250 | 151.7 | 113.6 (22.73 kHz tot) |
| Phase encoding dir. | R > > L | R > > L | A > > P |
| Parallel acc. factor | no | no | no |
| Acq. time (min:sec) | 1:52 | 2:30 | ∼3 (dep. on heart rate) |
| Cardiac gating | simulated | not needed | finger pulse |
| Orientation | axial | axial | axial |
| 3D T1‐w | Siemens | Philips | GE |
|---|---|---|---|
| Sequence name | MPRAGE | T1‐TFE | BRAVO |
| Dimension | 3D | 3D | 3D |
| TR (msec) | 2000 | 7.77 | 8.71 |
| TE (msec) | 3.72 | 3.56 | 3.66 |
| TI (msec) | 1000 | 1000 | 450 |
| # averages | 1 | 1 | 2 |
| Flip angle (deg) | 9 | 8 | 12 |
| Voxel sixe (mm) | 1 × 1 × 1 | 1 × 1 × 1 | 1 × 1 × 1 |
| Field of view (mm) | 320 × 260 × 192 | 256 × 256 × 192 | 256 × 256 × 96 |
| BW (Hz/Px) | 150 | 191.5 | 97.65 (25.00 kHz tot) |
| Phase encoding dir. | A > > P | A > > P | R > > L |
| Parallel acc. factor | 2 | 2 | no |
| Acq. time (min:sec) | 4:44 | 4:56 | 7:28 |
| Orientation | sagittal | sagittal | sagittal |
| 2D T2*‐w | Siemens | Philips | GE |
|---|---|---|---|
| Sequence name | MEDIC | M‐FFE | MERGE |
| Dimension | 2D | 2D | 2D |
| TR (msec) | 627 | 625 | 777 |
| TE (msec) | 15 | 2.52 | 13.77 |
| # echoes | 3 | 3 | 3 |
| # averages | 2 | 1 | 2 |
| Flip angle (deg) | 30 | 30 | 30 |
| Voxel sixe (mm) | 0.5 × .0.5 × 3 | 0.5 × .0.5 × 3 | 0.5 × .0.5 × 3 |
| Field of view (mm) | 160 × 160 × 45 | 160 × 160 × 45 | 128 × 128 × 45 |
| BW (Hz/Px) | 240 | 241.1 | 195.31 (25.00 kHz tot) |
| Phase encoding dir. | R > > L | R > > L | A > > P |
| Parallel acc. factor | 2 | no | no |
| Acq. time (min:sec) | 3:52 | 4:02 | 6:44 |
| Orientation | axial | axial | axial |