Abstract
Evaluation of structural parameters following a myocardial infarction (MI) is important to assess left ventricular function and remodeling. In this study, we assessed the capability of 3D diffusion tensor magnetic resonance imaging (DT-MRI) to assess tissue degeneration shortly after an MI using a porcine model of infarction. Two days after an induced infarction, hearts were explanted and immediately scanned by a 3T MRI scanner with a diffusion tensor imaging protocol. 3D fiber tracks and clustering models were generated from the diffusion-weighted imaging data. We found in a normal explanted heart that DT-MRI fibers showed a multilayered helical structure, with fiber architecture and fiber density reflecting the integrity of muscle fibers. For infarcted heart explants, we observed either a lack of fibers or disruption of fibers in the infarcted regions. Contours of the disrupted DT-MRI fibers were found to be consistent with the infarcted regions. Both histological and mechanical analysis of the infarcted hearts suggested DT-MRI fiber disruption correlated with altered microstructure and tissue mechanics. The ability of 3D DT-MRI to accurately distinguish viable myocardium from dead myocardium only 2 days post infarct without the use of radioisotopes or ionotropic agents makes it a promising approach to evaluate cardiac damage early post-MI.
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Acknowledgments
This project is supported by MAFES Strategic Research Initiative (CSREES MIS-741110) and MSU Research Initiation Program. JL is funded in part by National Heart, Lung, and Blood Institute (HL097321). The authors thank Dr. Michael S. Sacks (University of Pittsburgh) for support on biaxial device building. The authors would like to thank Amecha Landrum and Cade Austin from MSU INST for their help in MRI experiment and invaluable discussion and help from Dr. Shane Burgess.
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Zhang, S., Crow, J.A., Yang, X. et al. The Correlation of 3D DT-MRI Fiber Disruption with Structural and Mechanical Degeneration in Porcine Myocardium. Ann Biomed Eng 38, 3084–3095 (2010). https://doi.org/10.1007/s10439-010-0073-8
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DOI: https://doi.org/10.1007/s10439-010-0073-8