TABLE 1.
MRI acquisition parameters.
| MR1 | MR2 | MR3 | MR4 | |
| Manufacturer | Siemens | Siemens | Philips | Siemens |
| Model name | Avanto | Avanto | Ingenia | TrioTim |
| Station name | MEDPC26921 | MRC25494 | 3FCD991 | MRC35363 |
| System version | syngo MR B15 | syngo MR B17 | R6.0.531.1 | syngo MR B15 |
| Field strength (T) | 1.5 | 1.5 | 3 | 3 |
| 2D FLAIR | ||||
| Voxel size, mm3 | 0.5 × 0.5 × 6.0 | 0.5 × 0.5 × 6.0 | 0.5 × 0.5 × 6.0 | 0.5 × 0.5 × 6.0 |
| Number of slices | 20 | 20 | 18 | 20 |
| Repetition time (ms) | 9,000 | 9,000 | 7,000 | 8,000 |
| Echo time (ms) | 99 | 103 | 93 | 93 |
| Flip angle (°) | 150 | 150 | 90 | 130 |
| Voxel size, mm3 | 1.0 × 1.0 × 1.0 | 1.0 × 1.0 × 1.0 | 1.0 × 1.0 × 1.0 | 1.0 × 1.0 × 1.0 |
| Number of slices | 176 | 176 | 344 | 176 |
| Repetition time (ms) | 7,500 | 7,500 | 4,800 | 7,500 |
| Echo time (ms) | 402 | 396 | 310 | 389 |
| Flip angle (°) | 120 | 120 | 90 | 120 |
| 3D T1WI | ||||
| Voxel size, mm3 | 1.0 × 1.0 × 1.0 | 1.0 × 1.0 × 1.0 | 1.0 × 1.0 × 1.0 | 1.0 × 1.0 × 1.0 |
| Number of slices | 176 | 176 | 192 | 176 |
| Repetition time (ms) | 1,900 | 1,900 | 7.07 | 1,900 |
| Echo time (ms) | 3.37 | 3.37 | 3.19 | 2.96 |
| Flip angle (°) | 15 | 15 | 7 | 9 |
FLAIR, fluid-attenuated inversion recovery; T1WI, T1-weighted images.