Table 2.
MRI Protocols and Parameters
| GE Protocol 1 (H2H2) | T1-weighted (MPRAGE) | T2-weigthed FLAIR | T2*-weighted | T2-weighted | GE Protocol 2 (CARE) | T1-weighted (BRAVO) | T2-weighted FLAIR | T2*-weighted | T2-weighted |
|---|---|---|---|---|---|---|---|---|---|
| Slices | 160 | 160 | 70 | 160 | Slices | 164 | 160 | 70 | 160 |
| Matrix | 256 × 256 | 256 × 256 | 384 × 240 | 256 × 256 | Matrix | 256 × 256 | 256 × 256 | 384 × 240 | 256 × 256 |
| TE (ms) | 3.008 | 69.82 | 13.53a | 64.26 | TE (ms) | 2.91 | 66.25 | 13.53a | 63.69 |
| TR (ms) | 7.592 | 6500 | 58.70 | 2500 | TR (ms) | 6.62 | 6500 | 58.70 | 2500 |
| TI (ms) | 900 | 1889 | NA | NA | TI (ms) | 450.0 | 1910 | NA | NA |
| FOV (mm) | 256 | 256 | 256 × 160 | 256 | FOV (mm) | 256 | 256 | 256 × 160 | 256 |
| Thickness (mm) | 1.0 | 1.0 | 3.0 | 1.0 | Thickness (mm) | 1.0 | 1.0 | 3.0 | 1.0 |
| Siemens Protocol 1 (TRIO) | T1-weighted (MPRAGE) | T2-weighted FLAIR | T2*-weighted | T2-weighted | Siemens Protocol 2 (PRISMA) | T1-weighted (MPRAGE) | T2-weighted FLAIR | T2*-weighted | T2-weighted |
|---|---|---|---|---|---|---|---|---|---|
| Slices | 176 | 80 | 56 | NA | Slices | 176 | 176 | 56 | NA |
| Matrix | 256 × 256 | 256 × 256 | 384 × 240 | NA | Matrix | 256 × 256 | 256 × 256 | 384 × 240 | NA |
| TE (ms) | 2.98 | 390.00 | 10.00a | NA | TE (ms) | 2.98 | 390.00 | 10.00a | NA |
| TR (ms) | 2300.0 | 5000.0 | 45.0 | NA | TR (ms) | 2300.0 | 5000.0 | 45.0 | NA |
| TI (ms) | 900 | 1800 | NA | NA | TI (ms) | 900 | 1800 | NA | NA |
| FOV (mm) | 256 | 256 | 256 × 160 | NA | FOV (mm) | 256 | 256 | 256 × 160 | NA |
| Thickness (mm) | 1.0 | 2.0 | 3.0 | NA | Thickness | 1.0 | 1.0 | 3.0 | NA |
a
T2*-weighted sequences acquired multiple echoes; the first echo is indicated.
H2H2, Project Head to Head II; CARE, Concussion Assessment, Research and Education Consortium; FLAIR, fluid-attenuated inversion recovery; MPRAGE, 3D magnetization prepared rapid gradient echo; BRAVO, 3D BRAin Volume; ms, milliseconds; mm, millimeters; TE, echo time; TR, repetition time; TI = inversion time; NA, not applicable.