Image quality
| Grade | Characteristics |
|---|---|
| 4 | Excellent (high contrast, no artifacts) |
| 3 | Good (high contrast; minimal artifacts, eg, due to movement or implants) |
| 2 | Compromised (eg, noticeable movement artifacts and/or reduced homogeneity of the vessel contrast) |
| 1 | Heavily compromised (low contrast and/or strong movement artifacts) |
| 0 | Not diagnostic (vasculature is not differentiable due to heavy artifacts and/or missing contrast) |