Reduced-order modeling of blood flow for noninvasive functional evaluation of coronary artery disease.
Biomech Model Mechanobiol
; 18(6): 1867-1881, 2019 Dec.
Article
em En
| MEDLINE
| ID: mdl-31218576
ABSTRACT
We present a novel computational approach, based on a parametrized reduced-order model, for accelerating the calculation of pressure drop along blood vessels. Vessel lumina are defined by a geometric parametrization using the discrete empirical interpolation method on control points located on the surface of the vessel. Hemodynamics are then computed using a reduced-order representation of the parametrized three-dimensional unsteady Navier-Stokes and continuity equations. The reduced-order model is based on an offline-online splitting of the solution process, and on the projection of a finite volume full-order model on a low-dimensionality subspace generated by proper orthogonal decomposition of pressure and velocity fields. The algebraic operators of the hemodynamic equations are assembled efficiently during the online phase using the discrete empirical interpolation method. Our results show that with this approach calculations can be sped up by a factor of about 25 compared to the conventional full-order model, while maintaining prediction errors within the uncertainty limits of invasive clinical measurement of pressure drop. This is of importance for a clinically viable implementation of noninvasive, medical imaging-based computation of fractional flow reserve.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Doença da Artéria Coronariana
/
Doenças Cardiovasculares
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Biomech Model Mechanobiol
Assunto da revista:
ENGENHARIA BIOMEDICA
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Suíça