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Related Experiment Video

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Quantification of Mouse Heart Left Ventricular Function, Myocardial Strain, and Hemodynamic Forces by Cardiovascular Magnetic Resonance Imaging
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Three-dimensional cardiac strain imaging in healthy children using RF-data.

Richard G P Lopata1, Maartje M Nillesen, Johan M Thijssen

  • 1Cardiovascular Biomechanics, Department of BioMedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands. r.lopata@tue.nl

Ultrasound in Medicine & Biology
|July 20, 2011
PubMed
Summary

This study introduces a new 3-D radio-frequency strain imaging technique for pediatric cardiac ultrasound. The method shows feasibility for assessing cardiac function in children, enabling 3-D strain imaging of all three components.

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Published on: July 9, 2010

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Cardiology

Background:

  • Three-dimensional (3-D) ultrasound imaging has advanced, driving research in 3-D strain imaging.
  • Radio-frequency (RF)-based strain imaging offers potential advantages over speckle tracking due to phase information, but faces limitations like low frame rates in 3-D data.
  • Existing 2-D RF strain methods needed extension for 3-D cardiac applications.

Purpose of the Study:

  • To extend a 2-D RF strain methodology to three dimensions for analyzing 3-D full volume ultrasound data.
  • To assess the feasibility and performance of a novel 3-D RF-based strain imaging technique in healthy children.

Main Methods:

  • Acquired 3-D RF ultrasound data from 13 healthy children (ages 6-15) at 38-51 Hz frame rates.
  • Applied a 3-D, free-shape, coarse-to-fine algorithm for displacement and strain estimation from RF data.
  • Segmented the heart using 3-D ellipsoid fitting and estimated strain in radial, circumferential, and longitudinal directions.

Main Results:

  • Demonstrated the applicability of the 3-D RF strain estimation technique on full volume 3-D data.
  • Successfully performed 3-D strain imaging for radial, circumferential, and longitudinal components in pediatric hearts.
  • Reported average strain values in lateral walls and septum, noting potential underestimation in anterior/inferior walls due to image quality and resolution limitations.

Conclusions:

  • Concluded that 3-D strain imaging using RF data is feasible for pediatric cardiac assessment.
  • Highlighted the need for validation against other imaging modalities and conventional 3-D speckle tracking techniques.
  • Acknowledged limitations including field-of-view and image quality affecting comprehensive left ventricle imaging.