Table 1.
Sequence details of 3 T in situ and 7 T ex vivo MRI sequences.
| Sequence | 3 T in situ |
7 T ex vivo |
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|---|---|---|---|---|---|---|---|---|---|---|
| PD/T2 | 3D T1w | FLAIR | DTI | T2* | 3D T1 | 3D FLAIR | T2* |
|||
| At different resolutions | ||||||||||
| Repetition Time (ms) | 4250 | 7 | 8000 | 7400 | 31 | 4.1 | 8000 | 36 | 36 | 3140 |
| Echo time (ms) | 22/115 | 3 | 130 | 92 | 25 | 1.85 | 298 | 20 | 20 | 25 |
| Inversion time (ms) | – | 450 | 2000–2250 | – | – | – | – | – | – | – |
| Flip Angle (degrees) | – | 15 | – | – | 15 | 7 | – | – | – | – |
| Acquisition resolution (mm) | 0.65 × 0.73 × 3 | 1x1x1 | 1.11 × 1.11 × 1.2 | 2×2×2 | 0.65 × 0.65 × 3 | 0.89 × 0.9 × 0.9 | 0.6 × 0.6 × 0.6 | 0.6 × 0.6 × 0.6 | 0.3 × 0.3 × 0.3 | 0.24 × 0.24 × 1 |
| Reconstructed resolution (mm) | 0.5 × 0.5 × 3 | 0.5 × 0.5 × 1 | 1x1x1.2 | 2×2×2 | 0.5 × 0.5 × 3 | 0.85 × 0.85 × 0.9 | 0.3 × 0.3 × 0.6 | 0.18 × 0.18 × 0.6 | 0.18 × 0.18 × 0.3 | 0.21 × 0.21 × 1 |
| Acquisition Time (h:m:s) | 4:41 | 5:07 | 5:39 | 4:19 | 5:00 | 1:41 | 1:20:08 | 21:19 | 1:54:12 | 13:18 |
FLAIR = fluid attenuated inversion recovery; with optimized inversion times per case, due to differences in port-mortem delay and temperature/
Echo-planar imaging (EPI) diffusion tensor imaging (DTI) with b-value 700 s/mm2, 30 gradient directions and 5 b0 reference scans.