Peak systolic and diastolic velocities in the patients
| Patient No. | Tonsillar Herniation (mm) | Age (yr) | Syrinx | Aliasing or Other Artifact | Peak Systolic Velocity | Peak Diastolic Velocity |
|---|---|---|---|---|---|---|
| 1 | 5 | 21 | None | 2.3 | 2.5 | |
| 2 | 5 | 23 | None | 3.7 | 4.5 | |
| 3 | 5 | 28 | Syrinx | 1.9 | 3.8 | |
| 4 | 5 | 29 | None | 1.8 | 2.9 | |
| 5 | 4 | 57 | None | 3.5 | 5.3 | |
| 6 | 9 | 29 | Syrinx | Aliasing | 4.8 | 4.8 |
| 7 | 9 | 19 | Syrinx | Phase artifacts | 3.5 | 3.4 |
| 8 | 11, crowding | 20 | None | Aliasing | 2.8 | 4.6 |
| Average | 28.3 | 3.0 | 4.0 |