Wall shear stress (WSS) | Tangential force per unit area exerted on the aneurysm wall by the bloodflow. This data can be presented as the average, minimum, and maximum across either space or time, and is typically based on WSS vector magnitude. |
Low shear stress area | Surface area of aneurysm in which WSS is below a threshold (Ex. 10% of maximum WSS) |
Aneurysm size | Maximum diameter of aneurysm |
Size ratio | Ratio of aneurysm size to parent vessel diameter |
Aspect ratio | Ratio of maximum aneurysm height to aneurysm neck width |
Oscillatory shear index | Dimensionless measure of how much the instantaneous WSS vector is aligned with the time- averaged WSS vector (measure of changes in direction of shear forces on wall during cardiac cycle). Please refer to 32 for mathematical formula). |