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Estimating Regional Myocardial Contraction Using Miniature Transducers on the Epicardium.

Thuy Thu Nguyen1, Andreas W Espinoza2, Stefan Hyler3

  • 1Department of Microsystems, University of South-Eastern Norway, Horten, Norway.

Ultrasound in Medicine & Biology
|August 27, 2019
PubMed
Summary

This study presents a novel ultrasound system for monitoring cardiac motion using miniature epicardial transducers. The system accurately estimates myocardial velocity and strain, providing detailed regional heart function insights.

Keywords:
Miniature transducerMyocardiumPeri-operative monitoringPigStrainTissue velocityUltrasound

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Medical Imaging

Background:

  • Accurate monitoring of cardiac mechanics is crucial for understanding heart function and peri-operative care.
  • Existing methods may have limitations in real-time, high-resolution assessment of myocardial motion.

Purpose of the Study:

  • To develop a research tool for detailed cardiac mechanics studies.
  • To create a continuous, real-time system for peri-operative heart function evaluation.

Main Methods:

  • Utilized miniature 10 MHz ultrasound transducers sutured to the epicardial surface in a porcine model.
  • Employed pulse-echo mode with custom electronics to record radio frequency (RF) lines at 2500 Hz.
  • Developed a fuzzy logic algorithm for endocardial border detection and myocardial layer segmentation.
  • Calculated radial tissue velocity, strain rate, and strain from RF signals to track myocardial layer motion.

Main Results:

  • Demonstrated the system's capability to estimate myocardial velocity and strain patterns.
  • Successfully tracked the motion of segmented myocardial layers.
  • Obtained detailed information on regional myocardial function in a porcine model.

Conclusions:

  • The developed ultrasound system provides a viable method for detailed cardiac mechanics research.
  • The system offers potential for continuous, real-time peri-operative assessment of heart function.