Figure 1
Definition of the morphological parameters in end-wall aneurysm (A) and side-wall aneurysm (B). Aneurysm size is defined as the maximum distance of the dome from the aneurysm neck plane (W). Aspect ratio (AR) is defined as the maximum perpendicular height (H1) of the aneurysm divided by the average neck diameter of the aneurysm (N). D1: the diameter of the parent vessel at the edge of the neck, perpendicular to flow; D2: the diameter of the parent vessel perpendicular to flow, measured at 1.5D1 from D1; average diameter: (D1 + D2)/2; size ratio (SR) is defined as the maximum aneurysm height (H2) divided by the average diameter. Height–width (H/W) ratio is defined as the ratio of H2/W. Aneurysm width–parent artery diameter ratio is the ratio between W/D1. Flow angle (FA) is defined as the angle between the maximum height of the aneurysm and the parent vessel (α).
