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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

Imaging Studies for Cardiovascular System II:Types of Echocardiography

Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
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An Image-based Approach for 3D Left Atrium Functional Measurements.

Alan Morris1, Eugene Kholmovski2, Nassir Marrouche3

  • 1Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, UT, USA.

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|March 29, 2021
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Summary
This summary is machine-generated.

This study introduces a 3D imaging method for comprehensive left atrial (LA) function assessment in atrial fibrillation (AF) patients. The novel technique reveals that fibrotic tissue in the LA correlates with reduced elasticity, impacting overall function.

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Area of Science:

  • Cardiovascular Imaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Growing interest exists in assessing left atrial (LA) function in atrial fibrillation (AF) patients.
  • Current LA functional measurement methods are limited, assessing only subsets of parameters from single or biplane CINE-MRI scans.
  • A need exists for comprehensive LA functional evaluation in 3D.

Purpose of the Study:

  • To propose and validate an image-based method for comprehensive 3D evaluation of the entire LA function.
  • To quantify LA volume, ejection fraction, and surface strain throughout the cardiac cycle.
  • To correlate LA functional parameters with tissue fibrosis.

Main Methods:

  • Reconstructed 4D LA images from CINE image stacks covering the whole LA.
  • Registered and propagated segmentations from high-resolution Magnetic Resonance Angiography (MRA) through the cardiac cycle using deformable registrations.
  • Computed LA volume, ejection fraction, and surface strain, and registered these to Late Gadolinium Enhancement (LGE) scans for 52 patients.

Main Results:

  • Developed a comprehensive 3D method for LA functional assessment.
  • Quantified LA volume, ejection fraction, and surface strain across the cardiac cycle.
  • Observed a correlation coefficient of -0.11 between LGE (fibrosis) and strain, indicating reduced elasticity in fibrotic regions.

Conclusions:

  • The proposed 3D imaging method enables comprehensive LA functional evaluation.
  • LA fibrosis, as assessed by LGE, is associated with reduced LA elasticity (strain).
  • This method offers a more complete understanding of LA function in AF patients.