Computational Flow Models in Cerebral Congenital Aneurisms

Marc Thiriet 1
Abstract : Congenital cerebral aneurisms occur at the bifurcations of cerebral arteries. Two kinds of models of rigid aneurisms are investigated: a basilar-like bifurcation and a ophtalmica-carotis-like bifurcation aneurisms. Because the geometry of the aneurism neck and of the transition zone, which both affect the local flow, was not accurately known, two-dimensional models are developed. The largest cerebral arteries are explored using MR velocimetry to determine boundary conditions and flow repartition at branch points. The numerical solution of the Navier-Stokes equations for incompressible flows is obtained using the finite element method. The three main flow characteristics are: (i) swirls in the aneurism and in the transition zone, associated to slow flow at the aneurism dome, (ii) flow separation in the branches, and (iii) high pressure zones, more or less large, in the cavity or in the neck. High pressure zones responsible of aneurism rupture have also been observed in coil-obliterated cavity models. Similar results are observed in three-dimensional models.
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Rapport
[Research Report] RR-3768, INRIA. 1999
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https://hal.inria.fr/inria-00072894
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Soumis le : mercredi 24 mai 2006 - 11:13:37
Dernière modification le : mardi 17 avril 2018 - 11:30:30
Document(s) archivé(s) le : lundi 17 septembre 2012 - 16:15:12

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Marc Thiriet. Computational Flow Models in Cerebral Congenital Aneurisms. [Research Report] RR-3768, INRIA. 1999. 〈inria-00072894〉

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