Abstract
Subarachnoid Hemorrhage is a fatal disorder resulting from rupture of cerebral aneurysms. It is considered that aneurismal generation and rupture is closely associated with the blood flow pattern influenced by the arterial geometry such as bifurcation and rupture is closely associated with the blood flow pattern influenced by the arterial geometry such as bifurcation and curvature. To get the knowledge of dominant geometry factor causing the intra-aneurysmal flow pattern and wall shear stress, we carried out the Finite Element Simulation of intra-aneurysmal flow based on real medical CT images . We confirmed two facts; 1) when the Aspect Ratio (AR) of aneurysm is larger than 1.1,a weak vortex appears near the Dome and it forms a lower shear stress area compared with the surrounding area, and; 2) the Tilt Angle α of aneurysm is a factor that dominates the position of higher wall shear stress areas, namely as α increases, the position of high shear stress area migrates from the top of the Dome to the Posterior Neck.
