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Ventricular myocardial architecture as visualised in postmortem swine hearts using magnetic resonance diffusion
Peter Schmid1, Thomas Jaermann, Peter Boesiger
1Institute for Biomedical Engineering, University of Zurich and Swiss Federal Institute of Technology (ETH), Gloriastrasse 35, CH-8092 Zurich, Switzerland. peter.schmid@biomed.ee.ethz.ch
Summary
Magnetic resonance diffusion tensor imaging precisely reconstructed swine heart myocardial architecture. This study supports a complex 3D fiber mesh, not a unique myocardial band, with potential for diagnosing heart conditions.
Area of Science:
- Cardiovascular Anatomy
- Medical Imaging
- Biomedical Engineering
Background:
- The precise 3D arrangement of ventricular myocardial fibers is debated.
- Traditional histological and dissection methods have limitations.
Purpose of the Study:
- To utilize magnetic resonance diffusion tensor imaging (DTI) for precise 3D reconstruction of post-mortem swine heart myocardial architecture.
- To investigate the fiber orientation within the ventricular mass.
Main Methods:
- Acquired diffusion-weighted spin-echo MRI measurements on autopsied porcine hearts.
- Calculated diffusion tensors and eigenvectors on a voxel-by-voxel basis.
- Reconstructed fiber architecture by connecting voxels along eigenvector directions.
Main Results:
- Reconstructions revealed a complex 3D mesh of tangential and intruding myocardial fibers.
- In the left ventricle's middle layer, fibers were predominantly circular with a significant transverse component.
- Fiber orientation showed continuous angular change with depth from the epicardium.
Conclusions:
- The findings support a complex 3D mesh model of ventricular myocardial architecture.
- The data refutes the concept of a unique myocardial band.
- DTI has potential clinical applications for identifying architectural disarray in failing or malformed hearts.