TABLE 1.
Acquisition parameters of MRI sequences
| Acquisition | Axial FS | Sagittal | Sagittal FS | Coronal FS | Coronal | Coronal 2D |
|---|---|---|---|---|---|---|
| Parameter | T2w TSE | PDw TSE | PDw TSE | T2w TSE | T1w TSE | T2* mapping |
| Repetition time (ms) | 3860 | 1810 | 2000 | 3860 | 786 | 1150 |
| Echo time (ms) | 36 | 37 | 32 | 47 | 9.3 | 2.6, 5.6, 8.5, 11.5, 14.5, 17.4 |
| Flip angle (degrees) | 150 | 150 | 150 | 150 | 150 | 60 |
| Pixel BW (Hz/pix) | 195 | 240 | 240 | 200 | 200 | 405 |
| Field of view (mm2) | 130 × 130 | 110 × 110 | 110 × 110 | 110 × 110 | 110 × 110 | 150 × 150 |
| Matrix size | 256 × 233 | 256 × 218 | 256 × 218 | 320 × 224 | 320 × 224 | 352 × 352 |
| Resolution# (mm2) | 0.51 × 0.51 | 0.43 × 0.43 | 0.43 × 0.43 | 0.34 × 0.34 | 0.34 × 0.34 | 0.43 × 0.43 |
| Slice thickness (mm) | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 2.0 |
| Number of slices | 31 | 31 | 31 | 29 | 29 | 30–39 |
| Echo train length | 11 | 5 | 5 | 11 | 2 | 6 |
| Number of averages | 1 | 1 | 2 | 2 | 1 | 1 |
| Freq.-encoding direction | A-P | A-P | A-P | F-H | F-H | R-L |
| Imaging time (min) | 1:17 | 1:21 | 2:54 | 2:22 | 1:01 | 5:24–6:57 |
Abbreviations: A-P, anterior-posterior; BW, bandwidth; F-H, feet-head; Freq.-encod., frequency-encoding; FS, fat suppression; PDw, proton density-weighted; R-L, right-left; T1w, T1-weighted; T2w, T2-weighted; TSE, turbo spin echo.
#
Reconstructed pixel size is reported.