DWI sequence parameters
| Sequence | tseDWI | rsDWI |
|---|---|---|
| TR (ms) | 2000 | 4000 |
| TE (ms) | 103 | 66 (and 91 for phase-correction scan) |
| Voxel size (mm³) | 1.1 × 1.5 × 3 | 1.4 × 1.4 × 3 |
| FOV (mm²) | 220 | 230 |
| FOV in-phase direction | 100% | 65% |
| Phase direction | Anterior-posterior (axial), right to center (coronal) | Right to center (axial and coronal) |
| Phase resolution | 75% | 100% |
| Partial Fourier | 50% (phase) | 87.5% (readout) |
| Matrix | 192 × 144 | 160 × 104 |
| Section distance | 10% | 10% |
| No. of slices | 13 (axial)11 (coronal) | 13 (axial)11 (coronal) |
| Parallel imaging | GRAPPA ×2 | GRAPPA ×2 |
| Bandwidth (Hz/pixel) | 554 | 977 |
| Echo spacing (ms) | 4.48 | 0.36 |
| Readout segments | 1 | 5 |
| Flip angle | 150° | 180° |
| b-values (s/mm2) | 1000 | 0, 1000 |
| Averages | 10 | 1 (for b=0 s/mm²), 2 (for b=1000 s/mm²) |
| Diffusion mode | 3D diagonal | 4-scan trace |
| Diffusion scheme | Bipolar | Bipolar |
| Acquisition time (minute:second) | 4:22 (axial), 3:42 (coronal) | 3:06 |
Note:—GRAPPA indicates generalized autocalibrating partially parallel acquisition.