Acquisition parameters for 3D-QALAS and conventional MR imaging sequences
| Parameters | 3D-QALAS | 3D T1WI | 3D FLAIR | 3D DIR | TSE T2WI |
|---|---|---|---|---|---|
| Acquisition plane | 3D axial | 3D sagittal | 3D sagittal | 3D sagittal | 2D axial |
| Image matrix | 192 × 192 | 256 × 256 | 208 × 208 | 176 × 174 | 368 × 230 |
| FOV (mm) | 256 | 256 | 256 | 250 | 230 |
| Section thickness (mm) | 1.3 | 1 | 1.2 | 1.5 | 5 |
| Voxel size (mm) | 1.3 × 1.3 × 1.3 | 1.0 × 1.0 × 1.0 | 1.2 × 1.2 × 1.2 | 1.4 × 1.4 × 1.5 | 0.6 × 1.0 |
| TR (ms) | 6.2 | 8.2 | 4800 | 5500 | 4082 |
| TE (ms) | 2.8 | 3.8 | 371 | 306 | 90 |
| TI (ms) | a | – | 1660 | 2510/480 | – |
| Flip angle (degree) | 4 | 10 | 90 | 90 | 90 |
| Bandwidth (Hz/pixel) | 249 | 191 | 910 | 1076 | 167 |
| Averages | 1 | 1 | 1 | 2 | 3 |
| Scanning time | 9:06 | 6:20 | 5:22 | 5:03 | 1:42 |
Note: — – indicates no value.
↵a Inversion delay times, 100 ms, 1000 ms, 1900 ms, and 2800 ms; T2 prep echo time, 100 ms.