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Table 2: Parameters for MR imaging sequences^{^a}
Parameters T2* SPGR T1 WM-Nulled MPRAGE T1 CSF-Nulled MPRAGE T2 MPFLAIR
Acquisition 2D axial 3D coronal 3D coronal 3D coronal
TR 1200 ms 8.3 ms 3.9 ms 8000 ms
TE 17.7 ms 3.7 ms 8.5 ms 109.8 ms
TI NA 680 ms 1200 ms 2135 ms
Flip angle 60° 4° 6° 90°
Bandwidth 19.2 kHz 15.6 kHz 19.2 kHz 62.5 kHz
FOV 180 180 180 180
Matrix 384 × 384 180 × 180 224 × 224 224 × 224
No. of sections 90 256 256 256
Resolution 0.47 × 0.47 × 1 mm³ 1 × 1 × 1 mm³ 0.8 × 0.8 × 0.8 mm³ 0.8 × 0.8 × 0.8 mm³
Acceleration factor ASSET 2 ARC 1.5 × 1.5 ASSET 2.5 ARC 2 × 2
Acquisition time (min:s) 6:39 5:54 6:20 5:48
Note:—ASSET indicates array spatial sensitivity encoding technique; SPGR, spoiled gradient-recalled; ARC, Autocalibrating Reconstruction for Cartesian; NA, not applicable.
↵a Two patients had a slightly different resolution for T2* SPGR. One (patient 4 in Table 1) had a resolution of 0.47 × 0.47 × 1.2 mm³ and the other (patient 11 in Table 1) had a resolution of 0.47 × 0.47 × 1.1 mm³.