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.