Table 1.
Imaging protocol.
| Parameter | DWI Sequence | DCE Sequence |
|---|---|---|
| Sequence | Single-shot echo planar | T1 Dixon |
| Orientation | Transverse | Transverse |
| Repetition time (ms) | 6290–8695 | 5.41–5.97 |
| Echo time (ms) | 66 | Echo time 1, TE1: 2.46, Echo time 2, TE2: 3.69 |
| Voxel size (mm3) | 2.7 × 2.7 × 4 with in plane interpolation to 1.35 × 1.35 × 4 | 0.8 × 0.8 × 1.5 |
| Fat suppression | Inversion recovery Inversion time TI = 220, 250 ms for the Skyra Inversion time TI = 250 ms for the Vida |
- |
| Field of view (mm2) | 350 × 218 | 360 × 360 for the Skyra, 380 × 380 for the Vida |
| Matrix | 128 × 80 | 448 × 448 |
| Slice thickness (mm) | 4 | 1.5 |
| No. of slices | 39 to 45 | 112 |
| Multi-slice mode | Interleaved | Sequential |
| Parallel imaging | GeneRalized Autocalibrating Partial Parallel Acquisition (GRAPPA) | GeneRalized Autocalibrating Partial Parallel Acquisition (GRAPPA) |
| Acceleration factor | 2 | 3 |
| Bandwidth (Hz/pixel) | 2300 for the Skyra, 2298 for the Vida |
800 for the Skyra 860 for the Vida |
| Acquisition time (min) | 3:34 to 4:56 | 6:21 to 7:24 |
| b-values (s/mm2) | 50, 750, 1500 | - |
| Averages | 3, 8, 15, or 20 | - |
| Diffusion | 3D diagonal, i.e., along the direction (1, 1, 1) in the scanner coordinate system; single-refocused with vendor-provided eddy current correction ‘dynamic field correction’ | - |