Table 1.
MR imaging parameters of conv-DWI and L1-DWI based on single-shot EPI in this study.
| MR parameters | conv-DWI | L1-DWI | ||
|---|---|---|---|---|
| Volunteers | Group A | Group B | ||
| Acceleration factor | 2 | 3 | 3 | 3 |
| Slice thickness (mm) | 6 | 6 | 6 | 6 |
| Matrix size | 160 × 160 | 160 × 160 | 160 × 160 | 176 × 176 |
| Acquired voxel size (mm³) | 2.38 × 2.38 × 6 | 2.38 × 2.41 × 6 | 2.38 × 2.41 × 6 | 2.16 × 2.22 × 6 |
| Reconstructed voxel size (mm³) | 1.7 × 1.7 × 6 | 1.7 × 1.7 × 6 | 1.7 × 1.7 × 6 | 1.48 × 1.48 × 6 |
| TR/TE (ms) | 3981/86 | 3391/74 | 3391/74 | 3483/76 |
| Flip angle | 90 | 90 | 90 | 90 |
| Number of signal acquisition (NSA) | 4 | 4 | 4 | 4 |
| Echo train length | 69 | 45 | 45 | 49 |
| EPI factor | 69 | 45 | 45 | 49 |
| Phase-encoding direction | AP | AP | AP | AP |
| Number of slices | 31 | 31 | 31 | 31 |
| b-values (s/mm2) | 0/100/400/800 | 0/100/400/800 | 0/100/400/800 | 0/100/400/800 |
| Nominal acquisition time (min:s) | 3:31 | 3:00 | 3:00 | 3:24 |
conv-DWI Single-shot EPI-based DWI with parallel imaging reconstruction, L1-DWI Single-shot EPI-based DWI with L1-regularized iterative reconstruction.