Table 4.
Information on Scanning Sites Including Scanner Type and MRI Parameters
| Site | Scanner | TR/TE (ms) | Number of Slices | Slice- Thickness (mm) | Gap (mm) | Flip Angle | Orientation | In-plane Resolution | Volumes Acquired | Measure Time (s) |
|---|---|---|---|---|---|---|---|---|---|---|
| Site 1 | Siemens 3T Tim Trio | 2000/28 | 34 | 3.3 | 0.3 | 77° | Axial | 3.6×3.6mm2 | 210 | 420 |
| Site 2 | Philips Achieva 3T | 2400/28 | 43 | 3 | - | 85° | Axial | 3.44×3.44mm2 | 200 | 480 |
| Site 3 | Philips Achieva 3T | 21.75/32.4a | 40 | 4 | - | 10° | Coronal | 4×4mm2 | 600 | 366 |
| Site 4 | Siemens 3T Tim Trio | 2000/30 | 33 | 3 | 0.6 | 70° | Axial | 3×3mm2 | 156 | 312 |
| Site 5 | Siemens 3T Tim Trio | 2000/29 | 32 | 3.5 | 1 | 75° | Axial | 3.75×3.75mm2 | 150 | 300 |
Note: MRI, magnetic resonance imaging; TR, repetition time; TE, echo time. Site 1 = Aachen, Site 2 = Groningen, Site 3 = Utrecht, Site 4 = Göttingen, Site 5 = Alberquerque (COBRE).
aUtrect used a PRESTO-SENSE Sequence. This scan sequence achieves full brain coverage within 609ms by combining a 3D-PRESTO pulse sequence with parallel imaging in 2 directions (8-channel SENSE headcoil).