Table 2.
Image acquisition parameters.
| Bordeaux Younger Subjects | Stanford Younger Subjects | Stanford Older Subjects | ||||||
|---|---|---|---|---|---|---|---|---|
| Tl-weighted Protocol 1 | Tl-weighted Protocol 2 | WMnMPRAGE Protocol 1 | WMnMPRAGE Protocol 2 | Tl-weighted | WMnMPRAGE | Tl-weighted | WMnMPRAGE | |
|
| ||||||||
| Number of Subjects | 22 | 16 | 22 | 16 | 17 | 17 | 143 | 143 |
| Scanner | GE MR750 | Canon Galan | GE MR750 | Canon Galan | GE MR750 | GE MR950 | GE MR750 | GE MR950 |
| Field Strength | 3T | 3T | 3T | 3T | 3T | 7T | 3T | 7T |
| Head Coil | 32 channel (GE Healthcare) | 32 channel (Canon) | 32 channel (GE Healthcare) | 32 channel (Canon) | 32 channel (Nova Medical) | 32 channel (Nova Medical) | 32 channel (Nova Medical) | 32 channel (Nova Medical) |
| Base Sequence | 3D BRAVO | 3D MPRAGE | 3D MPRAGE | 3D MPRAGE | 3D MPRAGE | 3D MPRAGE | 3D BRAVO | 3D MPRAGE |
| Voxel Size (mm) | 1.0 × 1.0 × 1.0 | 0.6 × 0.6 × 0.6 | 1.0 × 1.0 × 1.0 | 0.8 × 0.8 × 0.8 | 0.8 × 0.8 × 0.8 | 1.0 × 1.0 × 1.0 | 0.9 × 0.9 × 0.9 | 1.0 × 1.0 × 1.0 |
| TE (ms) | 3.2 | 3 | 4.7 | 3.6 | 3.9 | 4.6 | 2.8 | 4.6 |
| TR (ms) | 8.5 | 7 | 11.1 | 7.8 | 8.5 | 10.1 | 7.3 | 10.1 |
| TI (ms) | 400 | 950 | 500 | 470 | 1200 | 680 | 450 | 680 |
| TS (ms) | – | – | 4500 | – | 3700 | 5500 | – | 5500 |
| Flip Angle (degrees) | 11 | 9 | 7 | 7 | 6 | 4 | 12 | 4 |
| Receive Bandwidth (kHz) | +/− 31.25 | +/− 51.3 | +/− 11.9 | +/− 53.4 | +/− 19.2 | +/− 11.9 | +/− 41.67 | +/− 11.9 |
| Slice Number | 180 | 234 | 220 | 200 | 250 | 220 | 186 | 220 |
| Views Per Segment | – | – | 240 | 240 | – | 240 | – | 240 |
| Acceleration Factor | – | 1.5 | 1.25×1.25 | 1.5 | 3 | 3 | 1.75 | 3 |
| Slice Orientation | sagittal | sagittal | coronal | axial | coronal | coronal | sagittal | coronal |
| Scan Time (min) | 10 | 4.5 | 7.2 | 11.2 | 4 | 11.1 | 4.8 | 11.1 |