Table 1.
MR imaging parameters for regular b-value DWI and high b-value DWI.
| Regular b-value DWI | High b-value DWI | |
|---|---|---|
| Technique | Multi-slice Single-shot SE-EPI | Multi-slice Single-shot SE-EPI |
| FOV | 140mm×140mm | 140mm×140mm |
| Scan Resolution | 1.25mm×1.25mm | 1.80mm×1.80mm |
| Scan Matrix | 112×108 | 76×75 |
| Recon Matrix | 256×256 | 256×256 |
| Slices | 26 | 26 |
| Slice Thickness | 2.73mm | 2.73mm |
| Slice gap | 0.27mm | 0.27mm |
| Orientation | Axial | Axial |
| Half-scan | 0.737 | 0.732 |
| Water fat shift | minimum (22.482 pixels) | minimum (13.319 pixels) |
| Bandwidth in EPI frequency direction | 1987 Hz | 2850 Hz |
| Fats Suppression | SPAIR | SPAIR |
| SENSE | 2 (RL) | 2 (RL) |
| Gradient Overplus | Yes | Yes |
| b factor (averages, scan duration) | 0 (3, 20sec), 188 (3, 45sec), 375 (3, 45sec), 563 (6, 89sec), 750 (6, 89sec) s/mm2 | 0 (1, 14sec), 1000 (5, 105sec), 2000 (5, 105sec) s/mm2 |
| TR | 4873ms | 6805ms |
| TE | 52ms | 52ms |
| Scan Time | 4min47sec | 3min44sec |
| Diffusion gradient timing DELTA / delta | 26.0ms/7.2ms | 25.7ms/12.4ms |