Table 2.
Scanners and scanning parameters for each center.
| Study 1 and 2 | Study 3 | Study 4 | |
|---|---|---|---|
| Scanner | Siemens 3 T | GE 3 T | Siemens 3 T |
| Model name | Trio Tim | Signa HDxt | Trio Tim |
| Anatomical scan | |||
| Weighting | T1 | T1 | T1 |
| Sequence | MPRAGE | 3D BRAVO | MPRAGE |
| TR (ms) | 1900 | 7.79 | 2300 |
| TE (ms) | 2.52 | 2.98 | 2.98 |
| IT (ms) | 900 | 800 | 900 |
| Resolution (mm3) | 1×1×1 | 1×1×1 | 1×1×1 |
| FOV (mm2) | 256×256 | 256×256 | 240×256 |
| Flip angle | 9 | 7 | 9 |
| Resting state fMRI | |||
| Weighting | T2* | T2* | T2* |
| Sequence | EPI | EPI | EPI |
| TR (ms) | 2000 | 2000 | 2400 |
| TE (ms) | 30 | 30 | 25 |
| Resolution (mm3) | 3.0×3.0×3.99 | 3.44×3.44×4.60 | 3.29×3.29×3.30 |
| FOV (mm2) | 192×192 | 220×220 | 224×217 |
| Flip angle | 90 | 90 | 80 |
| Num. of slices | 36 | 32 | 40 |
| Slice thickness (mm) | 3 | 4 | 3.3 |
| Num. of vols | 240 | 180 | 210 |
| Scanning time | 8 min | 6 min | 8 min 24 sec |