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Fourier coefficient description of left ventricular shape.

W H Round1, R H Bates, H Ikram

  • 1University of Waikato, Hamilton, NZ.

Australasian Physical & Engineering Sciences in Medicine
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

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A new method quantifies left ventricle shape using Fourier series coefficients from echocardiograms. A specific coefficient (alpha 2) shows promise for detecting apical abnormalities, especially with exercise, but requires averaging data from multiple scans for reliability.

Area of Science:

  • Cardiology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Accurate quantification of left ventricle (LV) shape is crucial for diagnosing cardiac abnormalities.
  • Traditional methods may lack precision or require complex analysis.
  • 2D echocardiography is a widely used, non-invasive imaging modality for cardiac assessment.

Purpose of the Study:

  • To develop and validate a novel method for quantifying left ventricle shape using Fourier series coefficients.
  • To assess the potential of these coefficients in classifying subjects with and without apical abnormalities.
  • To evaluate the impact of exercise on shape parameters and the reliability of measurements.

Main Methods:

  • A fifth-order trigonometric Fourier series was employed to describe LV shape from 2D echocardiograms.

Related Experiment Videos

  • Eleven Fourier coefficients were reduced to six clinically applicable coefficients (alpha 0 to alpha 5).
  • A trial was conducted to differentiate normal ventricles from those with apical abnormalities, including during exercise.

    • Main Results:

    • The coefficient alpha 2 was significantly higher in subjects with apical abnormalities compared to normal subjects.
    • This difference in alpha 2 increased with exercise, aligning with expectations.
    • Reliable estimation of alpha 2 from a single echocardiogram scan proved challenging, suggesting the need for data averaging.

    Conclusions:

    • The Fourier series-based method offers a quantitative approach to LV shape analysis in echocardiography.
    • The alpha 2 coefficient shows potential for detecting apical abnormalities, particularly under stress conditions.
    • Averaging data from multiple scans is likely necessary to achieve reliable alpha 2 values for individual patient assessment.