Compacting a Single Flow Diverter versus Overlapping Flow Diverters for Intracranial Aneurysms: A Computational Study

Porosity and pore density distributions of deployed FDs resulting from all 3 deployment methods in the 3 IAs. A, Deployed FD meshes in the fusiform IA and demarcations of FD zones used for porosity and pore density calculations: proximal vessel (PV), proximal transition (PT), middle (M), distal transition (DT), and distal vessel (DV). These zones are defined on the basis of the compacted FD but applied to all 3 deployment strategies for calculation of porosity and pore density. B, Porosity distribution. C, Pore density distribution. The arrows indicate middle zones in which the compacted FD has lower porosity or higher pore density than the overlapped FDs, whereas the ovals indicate middle zones in which it does not.

FD mesh compaction achieved in the 3 IAs. A, Compacted meshes at the IA orifice. Orifice areas are highlighted by the circular regions, and the compaction zones, by the rectangular regions. The arrows in the smaller schematics of each IA indicate viewing directions at each IA orifice. The arrows in the larger schematics of each IA orifice indicate the flow direction. Scale bars below each IA orifice indicate distances of 1 mm. B, Plot of compaction coverage (percentage) versus IA orifice area, showing a strong linear relationship.

Time-averaged, volume-rendered velocity magnitude in all 3 IAs for each FD strategy. Streamlines are plotted to enhance visualization of flow modifications due to each FD strategy. The arrows indicate the flow direction for each untreated IA.