Comparison of AR grading (based on FR) between 2DPC MRI and 4D flow MRI
| 4D flow | Upstalling | Dowstalling | |||||
| <=15% | 16%–25% | 26%–48% | >48% | 2DPC to 4D flow | 2DPC to 4D flow | ||
| 2DPC | <=15% | 13 | 0 | 0 | 0 | 0 (0.0%) | 0 (0.0%) |
| 16%–25% | 5 | 4 | 1 | 0 | 1 (10.0%) | 5 (50.0%) | |
| 26%–48% | 2 | 2 | 5 | 0 | 0 (0.0%) | 4 (44.4%) | |
| >48% | 0 | 0 | 1 | 1 | 0 (0.0%) | 1 (50.0%) | |
AR, aortic regurgitation; 4D, four dimensional; 2DPC, two-dimensional, phase-contrast .