Coil embolization is one of the most popular methods to treat cerebral aneurysms. We investigated hemodynamics in differently positioned aneurysms coiled at various volume embolization ratios (VER) to determine the effective VER in terms of flow stagnation. Simulations were conducted for patient specific aneurysm and idealized aneurysm. Porous media modeling was used to describe blood flow within the coil-embolized aneurysm. The ratio of flow stagnation volume to aneurysm volume (stagnant volume ratio, SVR) was analyzed to quantify the efficacy of coil embolization. The results showed that SVR tended to increase with increasing VER for both patient-specific and idealized aneurysms. For the idealized model, SVR was almost 100% at 20% of VER. In contrast, SVR in the patient specific aneurysm was approximately 40% for VER of 20%. These results suggested the importance of taking account of geometrical features of aneurysms when treating them by coil embolization.
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