Table 1.
Summary table of DTI parameters used in the scanners at the study sites.
| Siemens Skyra (Auckland and Adelaide) | GE HDxT (Christchurch) | |
|---|---|---|
| T2 weighted MRI | Sampling perfection with application optimized contrasts using a different flip angle evolution (SPACE) | GE SPACE (“CUBE”) |
| Repetition time | 3200 ms | 2500 ms |
| Echo time | 405 ms | 100 ms |
| Voxels | 0•9 × 0•9 × 1 mm | 1 × 1 × 1 mm |
| Field of view | 180 mm | 180 mm |
| Diffusion weighted MRI | ||
| Repetition time | 7300 ms | 7300 ms |
| Echo time | 106 ms | 97 ms |
| Voxels | 2 mm3 | 2 mm3 |
| Field of view | 256 mm | 256 mm |
| Diffusion weighted directions | 64 | 64 |
| b-value | 750 | 750 |
| b0 images | 11 | 11 |
| Phase-encoding | Right to left | Right to left |