TABLE 1.
Magnetic Resonance Imaging Sequence Parameters
| Imaging Parameters | 2D MESE | 3D GRE | 3D FLASH |
|---|---|---|---|
| Weighting | T2 | T1rho | T1 |
| Plane | Sagittal | Sagittal | Sagittal |
| Fat sat | Yes | Yes | Yes |
| Matrix | 256 × 128 | 256 × 128 | 320 × 320 |
| Number of slices | 31 | 30 | 80 |
| FOV (mm) | 150 | 150 | 130 |
| Slice thickness (mm) | 1.5 | 3 | 1.5 |
| Flip angle (°) | 180 | 25 | 3.9/23 (Before); 5.5/32.5 (After) |
| TE (ms) | 16.5/33/49.5/66/82.5 | 2.04 | 7.24 |
| TR (ms) | 4000 | 175 | 17 |
| BW (Hz/pixel) | 130 | 260 | 130 |
| Interpolated in-plane spatial resolution (mm) | 0.59 × 0.59 | 0.59 × 0.59 | 0.7 × 0.7 |
| Echo train length | 5 | 1 | 1 |
| NEX | 1 | 1 | 2 |
| Duration of each 90° pulse (μs) | 1536 | 200 | 200 |
| Acceleration factor | — | 2 | 2 |
| Spin-lock frequency (Hz) | — | 300 | — |
| Time of spin-lock (TSL) [ms] | — | 2/10/20/30 | — |
| Acquisition time | 8 minutes 30 seconds | 5 minutes 31 seconds/TSL | <15 minutes |
BW, band width; FLASH, fast low angle shot; FOV, field of view; GRE, gradient recalled echo; MESE, multiecho spin echo (MESE); NEX, number of excitations; TE, echo time; TR, relaxation time.