TABLE 1.
MR sequence parameters used for (A) 1.5T and (B) 3T imaging protocols.
| (A) | 1.5T (Signa HDxt) |
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| Sequence | GE-EPI BOLD | 3D IR-SPGR T1-w | T2-w Propeller | FLAIR | GRE |
| TR (ms) | 3,000 | 9.6 | 7,000 | 8,000 | 900 |
| TE (ms) | 45 | 4.0 | 90 | 100 | 15 |
| TI (ms) | − | 500 | − | 2,000 | − |
| Flip angle (°) | 90 | 8 | − | − | 20 |
| Field of view (cm) | 25.6 × 25.6 | 25.6 × 25.6 | 24 × 24 | 24 × 24 | 24 × 24 |
| Acquisition matrix | 64 × 64 | 192 × 192 | 320 × 256 | 384 × 256 | |
| Slice thickness (mm) | 4 | 1.3 | 4 | 4 | 4 |
| Number of slices | 36 | 160 | 36 | 36 | 36 |
| Other | − | − | 1.5 signal averages, matrix size 384 | − | − |
| (B) |
3T (Siemens Verio) |
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| Sequence | GE-EPI BOLD | 3D MPRAGE T1-w | T2-w BLADE | FLAIR BLADE | GRE |
| TR (ms) | 3,000 | 2,300 | 11,400 | 9,100 | 600 |
| TE (ms) | 30 | 2.98 | 120 | 125 | 10 |
| TI (ms) | − | 1,100 | − | 2,512 | − |
| Flip angle (°) | 90 | 9 | − | 130 | 15 |
| Field of view (cm) | 19.2 × 19.2 | 25.6 × 25.6 | 24 × 24 | 24 × 24 | 24 × 24 |
| Acquisition matrix | 64 × 64 | 256 × 256 | 384 × 384 | 256 × 256 | 320 × 256 |
| Slice thickness (mm) | 3 | 1 | 3 | 3 | 3 |
| Number of slices | 48 | 256 | 48 | 48 | 48 |
| Other | − | − | − | − | − |
GE-EPI, gradient-echo echo-planar imaging; IR-SPGR, inversion recovery spoiled gradient echo; MPRAGE, magnetization prepared-rapid gradient echo; FLAIR, fluid-attenuated inversion recovery; GRE, gradient recalled echo.