Table 4.
Diffusion tensor imaging acquisition protocol.
| Institution name | NW | UCLA 1 | UCLA 2 | Michigan | Stanford 1 | Stanford 2 | UAB |
|---|---|---|---|---|---|---|---|
| Scanner manufacturer | Siemens | Siemens | Siemens | – | GEMS | GEMS | Philips |
| Scanner model | Trio Tim | Trio Tim | Trio Tim | – | Discovery MR750 | Discovery MR750 | Achieva |
| Software version | B17 | B15 | B15 | – | DV22.0 | DV22.0 | 2.6.3 |
| Field strength (T) | 3 | 3 | 3 | – | 3 | 3 | 3 |
| Acquisition type | 2D EPI | 2D EPI | 2D EPI | – | 2D EPI | 2D EPI | 2D EPI |
| Image orientation | Axial obl | Axial obl | Axial obl | – | Axial obl | Axial obl | Axial obl |
| Flip angle [degrees] | 90 | 90 | 90 | – | 90 | 90 | |
| Repetition time (TR) [ms] | 9500 | 9400 | 9500 | – | 9600 | 9000 | 14,527–14,686 |
| Echo time (TE) [ms] | 88 | 87 | 88 | – | 93–94 | 76–90 | 75–76 |
| b-Values [# acq] [s/mm2] | 0/1000 (8/60) | 0/1000 (1/64) | 0/1000 (8/61) | 0/1000 (10/64) | 0/1000 (8/60) | 0/1000 (1/33) | |
| Number of directions (b > 0) | 60 | 64 | 61 | – | 64 | 60 | 33 |
| Pixel bandwidth [Hz] | 1347 | 1630–1700 | 1630–1700 | – | 1953 | 1953–3906 | 1784–1786 |
| Field of view (FOV) [mm] | 256 | 256 | 256 | – | 220 | 256 | 220 |
| Acquisition matrix | 128 × 128 | 128 × 128 | 128 × 128 | – | 128 × 128 | 128 × 128 | 128 × 128 |
| Slice thickness (gap) [mm] | 2 (0) | 2 (0) | 2 (0) | – | 4 (0.5) | 2 (0) | 2 (0) |
| Voxel resolution [mm] | 2 × 2 × 2 | 2 × 2 × 2 | 2 × 2 × 2 | – | 1.6 × 1.6 × 4 | 2 × 2 × 2 | 1.6 × 1.6 × 2 |