PublisherInternational Center for Numerical Methods in Engineering.
Rights accessRestricted access - publisher's policy
This study suggests a method for computing the constitutive model for veins in
vivo from clinically registered ultrasound images. The vein is modelled as a hyperelastic,
incompressible, thin-walled cylinder and the membrane stresses are computed using strain
energy. The material parameters are determined by tuning the membrane stress to the stress
obtained by enforcing global equilibrium.
In addition to the mechanical model, the study also suggests a preconditioning of the
pressure-radius signal. The preconditioning computes an average pressure-radius cycle from
all consecutive cycles in the registration and removes, or reduces undesirable disturbances. In
order to overcome this problem, an approach is proposed that allows constitutive equations to
be determined from clinical data by means of reasonable assumptions regarding in situ
configurations and stress states of vein walls. The approach is based on a two-dimensional
Fung-type stored-energy function that captures the characteristic nonlinear and anisotropic
responses of veins.
CitationFortuny, G. [et al.]. Determining the constitutive parameters of the human femoral vein in specific patients. A: International Conference on Computational Plasticity. "XI International Conference on Computational Plasticity". Barcelona: International Center for Numerical Methods in Engineering., 2011, p. 1-7.
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