Table 2.
MRI parameters
| Sample | MRI scanner | MRI protocol |
|---|---|---|
| 1 | Siemens Symphony Quantum | Two 3D MP-RAGE T1-weighted sequences |
| TR/TE/TI/FA = 2730 ms/4 ms/1000 ms/7° | ||
| Matrix = 192 × 256 | ||
| Scan time: 8.5 min per volume | ||
| Each volume consisted of 128 sagittal slices (1.33 × 1 × 1 mm) | ||
| 2 | Siemens Sonata | Two 3D MP-RAGE T1-weighted sequences |
| TR/TE/TI/FA = 2730 ms/3.43 ms/1000 ms/7° | ||
| Matrix: 256 × 256 | ||
| Scan time: 8 min and 46 s per volume | ||
| Each volume consisted of 128 sagittal slices (1.33 × 1 × 1 mm) | ||
| 3 | General Electric Signa | One 3D SPGR pulse T1-weighted sequence |
| TR/TE/FA = 24 ms/6.0 ms/35°, number of excitations was 2 | ||
| Matrix: 256 × 192 | ||
| Each volume consisted of 1.5 mm coronal slices, no gap, FOV = 24 cm | ||
| 4, 5, and 8 | Siemens Vision | 3–4 individual T1-weighted MP-RAGE sequences |
| TR/TE/TI/FA = 9.7 ms/4.0 ms/20 ms/10° | ||
| Matrix = 256 × 256 | ||
| Each volume consisted of 128 sagittal slices (1.25 × 1 × 1 mm). | ||
| 6 | General Electric Signa | One 3D SPGR pulse T1-weighted sequence |
| TR/TE/FA = 24 ms/5.0 ms/30° | ||
| Matrix = 256 × 192 | ||
| Each volume consisted of 124 contiguous axial slices (1.30 × 0.94 × 0.86 mm), FOV = 22 cm | ||
| 7 | Siemens Avanto | Two 3D MP-RAGE T1-weighted sequences |
| TR/TE/TI/FA = 2400 ms/3.61 ms/1000 ms/8° | ||
| Matrix: 192 × 192 | ||
| Scan time: 7 min and 42 s per volume | ||
| Each volume consisted of 160 sagittal slices (1.25 × 1.25 × 1.20 mm) |
FOV, Field of view; FA, flip angle; TR, repetition time; TE, echo time; TI, inversion time; MP-RAGE, magnetization-prepared rapid gradient echo; SPGR, spoiled gradient recalled.