Geometry in
Action: Artery Geometry
Computational Fluid Dynamics Modeling of Intracranial
Aneurysms: Effects of Parent Artery Segmentation on
Intra-Aneurysmal Hemodynamics
Source:
Abstract of
American Journal of Neuroradiology
27:1703-1709, September 2006
American Society
of Neuroradiology
The purpose of this study
is to show the influence of the upstream parent
artery geometry on intraaneurysmal hemodynamics of
cerebral aneurysms.
Two geometric models were
constructed for each aneurysm. One model had the native
parent vessel geometry; the second model was
truncated approximately 1 cm upstream from the aneurysm,
and the parent artery replaced with a straight
cylinder. Corresponding finite element grids were
generated and computational fluid dynamics simulations
were carried out under pulsatile flow conditions. The
intra-aneurysmal flow patterns and wall shear stress (WSS)
distributions were visualized and compared.
Models using the
truncated parent vessel underestimated the WSS in the
aneurysms in all cases and shifted the impaction zone to
the neck compared with the native geometry.
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