Influence of coil packing rate and configuration on intracranial aneurysm hemodynamics

Coiling is nowadays one of the most common endovascular therapies for intracranial aneurysms. However, the intra-aneurysmal hemodynamics changes after the coiling is not fully understood yet. The objectives of this study are to present a virtual coiling technique and to investigate the influences of coil packing rate and configuration on intraaneurysmal hemodynamics. We developed a medical image based virtual coiling algorithm. An internal carotid artery (ICA) aneurysm of a patient was virtually coiled with three different packing rates and coil configurations. Computational fluid dynamic (CFD) analysis was performed both untreated and treated aneurysm models. The aneurysmal flow velocity and wall shear stress (WSS) decreased significantly after the coiling. However, local WSS near the aneurysm orifice rather increased due the coils. The influence of coil configuration on the intra-aneurysmal flow velocity and WSS was less significant when the coil packing rate is high. A new methodology to model the coiled aneurysm is introduced in this study. The medical image based virtual coiling technique provides a feasible way to reproduce complicate hemodynamic in the coiled aneurysms. The intra-aneurysmal hemodynamics is significantly influenced by the coils. However, the hemodynamic differences due to the coil configuration were less significant with high coil packing rate.