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Related Experiment Videos

Two-component diffusion tensor MRI of isolated perfused hearts.

E W Hsu1, D L Buckley, J D Bui

  • 1Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708-0281, USA. Edward.Hsu@duke.edu

Magnetic Resonance in Medicine
|May 30, 2001
PubMed
Summary

High diffusion-weighting strengths reveal two distinct anisotropic diffusion components in myocardial magnetic resonance diffusion tensor imaging. This finding aids in understanding tissue compartments and improving myocardial fiber orientation mapping.

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Area of Science:

  • Biomedical Imaging
  • Cardiovascular Research
  • Diffusion Tensor Imaging

Background:

  • Nonmonoexponential MR diffusion decay is observed in tissues like the myocardium at high diffusion-weighting strengths.
  • The implications for myocardial MR diffusion tensor imaging (DTI) remain largely unexplored.

Purpose of the Study:

  • To investigate the underlying diffusion characteristics in myocardial tissue using a two-component diffusion tensor model.
  • To explore the potential of this model for myocardial fiber orientation mapping.

Main Methods:

  • A slow-exchange-limit, two-component diffusion tensor model was applied.
  • Diffusion-weighted images were acquired from isolated, perfused rat hearts.

Main Results:

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  • At least two distinct anisotropic diffusion components were identified.
  • A 'fast' component with diffusivity similar to the perfusate and a highly anisotropic 'slow' component were characterized.
  • These components likely correspond to different tissue compartments (vascular, intracellular, interstitial) and align with myocardial fiber orientations.

Conclusions:

  • The study identifies distinct diffusion components in the myocardium, suggesting contributions from vascular, intracellular, and interstitial spaces.
  • These findings have implications for enhancing myocardial fiber orientation mapping using MR diffusion tensor imaging.
  • Limitations of the current two-component model were also discussed.