Table 1 MR parameters for the IVIM-DWI and DCE-MRI sequences.
MRI Parameters | Liver tumours (n=25 patients) | |
|---|---|---|
IVIM-DWI | DCE-MRI | |
Sequence | 2D single shot echo planar imaging | 3D gradient echo |
Acquisition plane | Coronal | Coronal |
Breathing mode | Free breathing | Breath holding |
Total acquisition time [min:s] | 10:25 | 04:18 |
Time per single acquisition [min:s] | 02:05 | 04:18 |
Number of averages | 5 | 1 |
Acquired voxel size [mm3] | 3.1 × 3.1 × 5 | 3.1 × 3.1 × 5 |
Reconstructed voxel size [mm3] | 1.56 × 1.56 × 5 | 1.56 × 1.56 × 5 |
Slice thickness [mm] | 5 | 5 |
TR [ms] | 5000 | 3 |
TE [ms] | 60 | 0.89 |
Flip angle [˚] | - | 11 |
Slices per slab | 20 | 14 |
Slice gap [mm] | 0 | 0 |
Slice oversampling [%] | - | 14.3 |
Matrix (FE x PE) | 128 × 128 | 128 × 128 |
FOV [mm2] | 400 × 400 | 400 × 400 |
Dynamic measurements | - | 40 |
Breath holding (pause 6 s after dyn2, dyn4,etc.) | no | yes |
Receiver bandwidth [Hz/Pixel] | 1860 | 650 |
Parallel acquisition (GRAPPA) (PE acceleration factor x reference lines) | 2 × 30 | 2 × 24 |
Phase partial Fourier | 7/8 | no |
Slice partial Fourier | - | 6/8 |
Fat suppression | SPAIR | none |
8 b-values [s/mm2] | 0, 20, 40, 60, 120, 240, 480, 900 | - |
Diffusion times [ms] | δ = 14.6; Δ = 24 | - |