Table 2:
Imaging parameters of standard DWI
| Standard DWI on 1.5T MRI | Standard DWI on 3T MRI | |
|---|---|---|
| Sequence type | sshot SE-EPI | sshot SE-EPI |
| Slice orientation | Transversal | Transversal |
| FOV (RL × AP) | 230 × 230 mm2 | 230 × 230 mm2 |
| Acquisition voxel size (RL × AP × FH) | 1.4 × 2.0 × 3.0 mm3 | 1.55 × 1.95 × 3.0 mm3 |
| No. of slices | 47 | 50 |
| TR | 6642 ms | 6224 ms |
| TE | 97 ms | 85 ms |
| Flip angle | 90° | 90° |
| Sensitivity encoding factor | 2 | 2 |
| Half scan factor | 0.8 | No |
| Bandwidth | 16.6 Hz/pixel | 20.7 Hz/pixel |
| EPI factor | 57 | 59 |
| No. of signal averages | 1 | 1 |
| Acquisition duration (minutes:seconds) | 02:16 | 01:52 |
| Fat suppression | SPIR | SPIR |
| b-values | 0, 1000 s/mm2 | 0, 1000 s/mm2 |
Note:—SPIR indicates spectral presaturation with inversion recovery; RL, right left; AP, anterior posterior; FH, feet head.