Velocity vector images in a characteristic section depicting the main vortex in 4 aneurysms and the inflow jet in 3 of the aneurysms. Velocity vector images in a characteristic section depicting the main vortex in 4 aneurysms and the inflow jet in 3 of the aneurysms. The images depict the aneurysms at peak systole and diastole in isosurfaces (gray) for 3D PC-MR imaging, CFD with inflow boundary conditions obtained from 2D PC-MR imaging, and CFD with inflow boundary conditions obtained from 3D PC-MR imaging. P. van Ooij et al. AJNR Am J Neuroradiol 2013;34:1785-1791 ©2013 by American Society of Neuroradiology