Abstract
Hemodynamics in saccular cerebral aneurysms is associated with complex vortex structures driven by the modalities of inflow and outflow through the neck and by the shape of the aneurysm sac. Although accepted in principle, the influence of aneurysm geometry on local hemodynamics is still far from being elucidated. Shedding light on such relationship would allow to predict flow features from aneurysm anatomy, which in turn would have a enormous impact on clinical evaluation and treatment planning. In this work, we present data that supports the existence of a connection between the structure of vortices in aneurysm sacs and the medial axis associated with their shape. The medial axis of a 3D shape is a non-manifold surface hosting the centres of maximal inscribed spheres, and has its discrete counterpart in the embedded Voronoi diagram. Each sheet of the medial axis represents a portion of the shape, and the closer the sheet is to the surface, the smaller the surface feature it represents.
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