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The impact of valve simplifications on left ventricular hemodynamics in a three dimensional simulation based on in vivo MRI data.

To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.jbiomech.2016.03.021 Byline: Ali Imanparast (a), Nasser Fatouraee [nasser@aut.ac.ir] (a,*), Farhad Sharif (b) Keywords Computational fluid dynamics; Mitral valve; Aor... Full description

Journal Title: Journal of biomechanics June 14, 2016, Vol.49(9), pp.1482-1489
Main Author: Imanparast, Ali
Other Authors: Fatouraee, Nasser , Sharif, Farhad
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1873-2380 ; DOI: 10.1016/j.jbiomech.2016.03.021
Link: http://search.proquest.com/docview/1792771549/?pq-origsite=primo
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title: The impact of valve simplifications on left ventricular hemodynamics in a three dimensional simulation based on in vivo MRI data.
format: Article
creator:
  • Imanparast, Ali
  • Fatouraee, Nasser
  • Sharif, Farhad
subjects:
  • Adult–Physiology
  • Aortic Valve–Physiology
  • Blood Flow Velocity–Physiology
  • Hemodynamics–Physiology
  • Humans–Physiology
  • Hydrodynamics–Physiology
  • Magnetic Resonance Imaging–Physiology
  • Male–Physiology
  • Mitral Valve–Physiology
  • Models, Cardiovascular–Physiology
  • Ventricular Function–Physiology
  • Aortic Valve
  • Computational Fluid Dynamics
  • Mitral Valve
  • Vortex Structures
ispartof: Journal of biomechanics, June 14, 2016, Vol.49(9), pp.1482-1489
description: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.jbiomech.2016.03.021 Byline: Ali Imanparast (a), Nasser Fatouraee [nasser@aut.ac.ir] (a,*), Farhad Sharif (b) Keywords Computational fluid dynamics; Mitral valve; Aortic valve; Vortex structures Abstract Left ventricle (LV) fluid dynamics and the function of its valves have a crucial impact on clinical diagnosis, treatment and prosthesis design. In this paper, we simulated left ventricular flow using 3D computational fluid dynamics (CFD) based on geometrical and deformational information obtained from MRI. Time variant smoothed LV shapes were extracted from MR images. Corresponding deformation data was interpolated using a cubic-spline interpolation. To evaluate valve influence on LV flow, we compared two planar valve models: physiologically corrected gradually opening/closing model and a simple on/off model. Endocardial displacement was applied to fluid boundary using fluid--structure interaction (FSI) approach. Arbitrary Lagrangian--Eulerian (ALE) formulation was used for unsteady incompressible viscous Newtonian blood flow in the fluid domain. Comparison of results for LV flow with two valve models demonstrated a clear distinction between pressure distribution, velocity distribution, vortex formation/growth/vanishing and energy dissipation especially in the filling phase. Consequently, LV flow simulation by ignoring geometrical details of valves' model may lead to non-realistic results in some aspects. Author Affiliation: (a) Department of Biomedical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran (b) Department of Polymer Engineering & Color Technology, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran * Corresponding author. Tel.: +98 2164542368. Article History: Received 2 September 2015; Revised 11 March 2016; Accepted 13 March 2016
language: eng
source:
identifier: E-ISSN: 1873-2380 ; DOI: 10.1016/j.jbiomech.2016.03.021
fulltext: fulltext
issn:
  • 18732380
  • 1873-2380
url: Link


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titleThe impact of valve simplifications on left ventricular hemodynamics in a three dimensional simulation based on in vivo MRI data.
creatorImanparast, Ali ; Fatouraee, Nasser ; Sharif, Farhad
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subjectAdult–Physiology ; Aortic Valve–Physiology ; Blood Flow Velocity–Physiology ; Hemodynamics–Physiology ; Humans–Physiology ; Hydrodynamics–Physiology ; Magnetic Resonance Imaging–Physiology ; Male–Physiology ; Mitral Valve–Physiology ; Models, Cardiovascular–Physiology ; Ventricular Function–Physiology ; Aortic Valve ; Computational Fluid Dynamics ; Mitral Valve ; Vortex Structures
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descriptionTo access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.jbiomech.2016.03.021 Byline: Ali Imanparast (a), Nasser Fatouraee [nasser@aut.ac.ir] (a,*), Farhad Sharif (b) Keywords Computational fluid dynamics; Mitral valve; Aortic valve; Vortex structures Abstract Left ventricle (LV) fluid dynamics and the function of its valves have a crucial impact on clinical diagnosis, treatment and prosthesis design. In this paper, we simulated left ventricular flow using 3D computational fluid dynamics (CFD) based on geometrical and deformational information obtained from MRI. Time variant smoothed LV shapes were extracted from MR images. Corresponding deformation data was interpolated using a cubic-spline interpolation. To evaluate valve influence on LV flow, we compared two planar valve models: physiologically corrected gradually opening/closing model and a simple on/off model. Endocardial displacement was applied to fluid boundary using fluid--structure interaction (FSI) approach. Arbitrary Lagrangian--Eulerian (ALE) formulation was used for unsteady incompressible viscous Newtonian blood flow in the fluid domain. Comparison of results for LV flow with two valve models demonstrated a clear distinction between pressure distribution, velocity distribution, vortex formation/growth/vanishing and energy dissipation especially in the filling phase. Consequently, LV flow simulation by ignoring geometrical details of valves' model may lead to non-realistic results in some aspects. Author Affiliation: (a) Department of Biomedical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran (b) Department of Polymer Engineering & Color Technology, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran * Corresponding author. Tel.: +98 2164542368. Article History: Received 2 September 2015; Revised 11 March 2016; Accepted 13 March 2016
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