Using Parameterization and Springs toDetermine Aneurysm Wall Thickness
Johnson, Erick, Yongjie Zhang, and Kenji Shimada
Proceedings, 18th International Meshing Roundtable, Springer-Verlag, pp.397-414, October 25-28 2009
18th International Meshing Roundtable
Salt Lake City, UT, USA.
October 25-28, 2009
Carnegie Mellon University, 5000 Forbes Ave. Pittsburgh, PA 15289
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Aneurysms are an enlargement of a blood vessel due to a weakened
wall and can pose significant health risks. Abdominal aortic aneurysms alone are
the 13th leading cause of death in the United States, with 15,000 deaths annually.
While there are recommended guidelines for doctors to follow in the treatment of
specific aneurysms, they cannot guarantee a satisfactory outcome. Computer simulations
of an aneurysm may be able to help doctors in their treatment; however,
the results are inaccurate if the vessel wall thickness is poorly measured. In order to
provide more accurate, patient-specific simulations, not only does geometry for the
fluid domain need to be created from medical images for analysis, but the creation
of more accurate models for the wall needs to be accomplished as well. This paper
proposes a solution to the latter by deforming the mesh from a healthy vessel into
one with an aneurysm through parameterization and the use of a spring model.
The thickness of the resulting wall model is empirically valid and fluid-structure
interaction simulations show significant improvements when using a variable versus
a uniform wall thickness.
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