Table 1. Scan Parameters for DWI Sequences.
| Scan Parameters | C-DWI | SMS2-DWI | SMS3-DWI |
|---|---|---|---|
| Repetition time, ms | 6700 | 3700 | 2500 |
| Echo time, ms | 63 | 72 | 74 |
| Slice thickness, mm | 5 | 5 | 5 |
| Number of slices | 40 | 40 | 40 |
| Bandwidth, Hz/px | 1860 | 1860 | 1860 |
| Echo spacing, ms | 0.6 | 0.6 | 0.6 |
| Voxel size, mm3 | 1.7 × 1.7 × 5 | 1.7 × 1.7 × 5 | 1.7 × 1.7 × 5 |
| iPAT | GRAPPA 2 | GRAPPA 2 | GRAPPA 2 |
| SMS AF | - | 2 | 3 |
| Fat saturation | SPAIR | SPAIR | SPAIR |
| Diffusion mode | 4-scan trace | 4-scan trace | 4-scan trace |
| Concatenations | 1 | 1 | 1 |
| b-values, s/mm2 (averages) | 0 (2), 300 (2), 1000 (3) | 0 (2), 300 (2), 1000 (3) | 0 (2), 300 (2), 1000 (3) |
| Scan time, sec | 173 | 107 | 77 |
C-DWI = conventional DWI, DWI = diffusion-weighted imaging, GRAPPA = generalized autocalibrating partially parallel acquisition, iPAT = integrated parallel acquisition technique, SMS = simultaneous multislice, SMS AF = SMS acceleration factor, SMS2-DWI = SMS accelerated DWI with acceleration factor of 2, SMS3-DWI = SMS accelerated DWI with acceleration factor of 3, SPAIR = spectral attenuated inversion recovery