TABLE 1.
Acquisition parameters
| Children and young adults | Older adults ADNI 2 | |
|---|---|---|
| Parameters | YOUth MRI protocol | (Philips: MPRAGE) |
| Multicenter | No, a single MR scanner | Yes |
| Type of MR scanner | Philips Ingenia | Philips Achieva |
| Field strength (T) | 3.0 | 3.0 |
| Head‐coil | 32‐channel SENSE head‐coil | 8‐channel SENSE head‐coil |
| Scan | Structural T1W 3D GRE | Structural T1W 3D GRE |
| Scan orientation | Sagittal | Sagittal |
| TR (ms) | 10 | 6.8 |
| TE (ms) | 4.6 | 3.1 |
| Flip angle (degrees) | 8 | 9 |
| Field of view (mm) | 240 × 240 × 200 | 256 × 240 × 204 |
| Acquisition matrix | 304 × 304 | 256 × 240 |
| Reconstructed voxel size (mm3) | 0.75 × 0.75 × 0.80 | 1.00 × 1.00 × 1.20 |
Abbreviations: GRE, gradient echo; T1W, T1‐weighted; T, Tesla; TE, echo time; TR, repetition time.