A finite element model of the cardiac ventricles with coupled circulation: Biventricular mesh generation with hexahedral elements, airbags and a functional mockup interface to the circulation
| Autor: | Mark B. Ratcliffe, Vicky Y. Wang, Arthur W. Wallace, Liang Ge, Jennifer Adams, Yue Zhang, Jiwon Kim, Ashley E. Morgan, Jonathan W. Weinsaft, Mehrzad Tartibi, Lucas Horwitz |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Contouring Heart Ventricles Finite Element Analysis Cardiac Ventricle Health Informatics Heart Finite element method Computer Science Applications Constriction Circulation (fluid dynamics) Mesh generation Functional Mock-up Interface cardiovascular system Humans Computer Simulation cardiovascular diseases Hexahedron Air Bags Biomedical engineering |
| Zdroj: | Computers in biology and medicine. 137 |
| ISSN: | 1879-0534 |
| Popis: | Introduction Finite element (FE) mechanics models of the heart are becoming more sophisticated. However, there is lack of consensus about optimal element type and coupling of FE models to the circulation. We describe biventricular (left (LV) and right (RV) ventricles) FE mechanics model creation using hexahedral elements, airbags and a functional mockup interface (FMI) to lumped-parameter models of the circulation. Methods Cardiac MRI (CMR) was performed in two healthy volunteers and a single patient with ischemic heart disease (IHD). CMR images were segmented and surfaced, meshing with hexahedral elements was performed with a “thin butterfly with septum” topology. LV and RV inflow and outflow airbags were coupled to lumped-parameter circulation models with an FMI interface. Pulmonary constriction (PAC) and vena cava occlusion (VCO) were simulated and end-systolic pressure-volume relations (ESPVR) were calculated. Results Mesh construction was prompt with representative contouring and mesh adjustment requiring 32 and 26 min Respectively. The numbers of elements ranged from 4104 to 5184 with a representative Jacobian of 1.0026 ± 0.4531. Agreement between CMR-based surfaces and mesh was excellent with root-mean-squared error of 0.589 ± 0.321 mm. The LV ESPVR slope was 3.37 ± 0.09 in volunteers but 2.74 in the IHD patient. The effect of PAC and VCO on LV ESPVR was consistent with ventricular interaction (p = 0.0286). Conclusion Successful co-simulation using a biventricular FE mechanics model with hexahedral elements, airbags and an FMI interface to lumped-parameter model of the circulation was demonstrated. Future studies will include comparison of element type and study of cardiovascular pathologies and device therapies. |
| Databáze: | OpenAIRE |
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