Table 2.
Definition of the 11 manually measured morphological parameters and two visually assessed parameters [5, 21]
| Morphological parameters | Definition |
|---|---|
| Width (W) | Maximum width of the aneurysm |
| Size (H) | Maximum perpendicular distance of the dome from the neck plane |
| Neck (D) | Twice the average distance from the neck centroid to the edge of the neck |
| Parentvessel diameter 1 (D1) | Vessel diameter at the proximal neck |
| Parentvessel diameter 2 (D2) | Vessel diameter 1.5 × D1 upstream |
| Maximum height (Hmax) | Maximum distance of the dome from the middle of the neck |
| Size Ratio (SR) | Ratio of the maximum aneurysm height to the average vessel diameter |
| Aspect ratio (AR) | Ratio of the maximum perpendicular height to the average neck diameter |
| Vessel angle | Angle between the inlet vessel centerline and the neck plane |
| Inclination angle | Angle of inclination between the IA and its neck plane |
| Frontal base-dome-angle | Angle between the maximum height of the aneurysm and the frontal skull base in sagittal CT-scans |
| Appearance of aneurysm bleps | Secondary outpouching of the aneurysm |
| Aneurysm shape | Visually assessed regular or irregular structure of the aneurysm wall |