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Kinematics of the Heart: Finite Element and 3D Time-Resolved Phase Contrast Magnetic resonance Imaging
Linköping University, Department of Biomedical Engineering, Biomedical Modelling and Simulation. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Medicine and Care. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0003-1395-8296
Linköping University, Department of Medicine and Care. Linköping University, Faculty of Health Sciences.
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2002 (English)In: Proceedings of 9th Workshop on The Finite Element Method in Biomedical Engineering, Biomechanics and Related Fields, 2002Conference paper, Published paper (Refereed)
Abstract [en]

The complex three-dimensional structure of the heart muscle (myocardium) has anisotropic, non-linear and time-dependent mechanical properties. During the cardiac cycle, the myocardium undergoes large elastic deformations as a consequence of the active muscle contraction along the muscle fibers and their relaxation, respectively. A four-dimensional (4D) description (three spatial dimensions + time) of the mechanical properties of the myocardium would be of interest in the assessment of myocardial function. Time-resolved 3D phase contrast MRI makes it possible to quantify all three velocity components, which is necessary to as accurately as possible describe the velocities in the heart. The velocity data may be used for investigation of the deformation of the heart and calculation of strain in the myocardial wall. We present a method for estimation of myocardial kinematics using finite elements and 3D time-resolved phase contrast MRI.

Place, publisher, year, edition, pages
2002.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-62681OAI: oai:DiVA.org:liu-62681DiVA: diva2:373975
Conference
9th 9th Workshop on The Finite Element Method in Biomedical Engineering, Biomechanics and Related Fields. University of Ulm, Germany, 18-19 July.
Available from: 2010-12-02 Created: 2010-12-02 Last updated: 2013-11-25
In thesis
1. Kinematics of the heart: strain and strain-rate using time-resolved three-dimensional phase contrast MRI
Open this publication in new window or tab >>Kinematics of the heart: strain and strain-rate using time-resolved three-dimensional phase contrast MRI
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

During the cardiac cycle, the myocardium (heart muscle) undergoes large elastic deformations as a consequence of the active muscle contraction along the muscle :fibers and their relaxation, respectively. A four-dimensional (4D) description (three spatial dimensions + time) of the kinematics of the myocardium would bring increased understanding of the mechanical properties of the heart and may be of interest in assessing regional myocardial function.

The heart is a complex three-dimensional structure and therefore velocity components in three directions are necessary to accurately describe the velocities in the myocardium. The phase contrast MRI pulse sequence used in this work provides velocity vectors in a 3D spatial grid covering the entire heart throughout the cardiac cycle. The suggested method provides the strain-rate tensor in each measured voxel and time frame of the cardiac cycle, calculated from the velocity field. Coordinates for the measured voxels,obtained from the velocity data, defme the deformation of a finite element mesh. This mesh is used for calculation of myocardial strain.

The method presented in this thesis enables automated delineation of the borders of the myocardium, definition of a parametric fmite element mesh and calculation of 4D myocardial strain and strain-rate throughout the cardiac cycle. The suggested visualization method displays the full tensors, including the main direction of deformation or deformation rate without any assumptions of myocardial motion directions in the calculations.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004. 44 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1097
Series
LiU-TEK-LIC, 24
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-33626 (URN)19661 (Local ID)91-7373-970-7 (ISBN)19661 (Archive number)19661 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-25

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Selskog, PernillaTorstenfelt, BoEbbers, TinoWigström, Lars

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Selskog, PernillaTorstenfelt, BoEbbers, TinoWigström, Lars
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Biomedical Modelling and SimulationThe Institute of TechnologySolid MechanicsDepartment of Medicine and CareFaculty of Health SciencesDepartment of Biomedical Engineering
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