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Related Experiment Videos

Echographic image mean gray level changes with tissue dynamics: a system-based model study

J Meunier1, M Bertrand

  • 1Département d'Informatique et de Recherche Opérationnelle, Université de Montréal, Canada.

IEEE Transactions on Bio-Medical Engineering
|April 1, 1995
PubMed
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Echography shows decreased intensity during heart contraction. This study uses a continuum model to link gray level changes to cell size, orientation, and deformation, explaining myocardial contraction effects.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging Physics
  • Cardiovascular Ultrasound

Background:

  • Echography studies report a decrease in backscattering intensity during myocardial contraction.
  • This phenomenon is characterized by minimum intensity at end-systole and maximum at end-diastole.
  • The underlying mechanisms of this intensity variation require further investigation.

Purpose of the Study:

  • To investigate the causes of systematic decrease in echographic backscattering intensity during myocardial contraction.
  • To establish a mathematical relationship between image gray level changes and tissue properties.
  • To model the effect of cellular changes on acoustic wave scattering in myocardial tissue.

Main Methods:

  • Development of a three-dimensional inhomogeneous continuum model.

Related Experiment Videos

  • Simulation of acoustic wave scattering by individual cells within the tissue model.
  • Mathematical analysis relating mean gray level changes to cell size, orientation, deformation, and transducer frequency.
  • Application of the model to a myocardial tissue example.

    • Main Results:

    • The mathematical model demonstrates a clear relationship between mean gray level changes and cellular characteristics (size, orientation, deformation).
    • Transducer frequency was identified as a factor influencing the observed gray level variations.
    • Myocardial contraction effects were explained by changes in cardiac fiber orientation and deformation within the model.
    • The model successfully describes the reported gray level changes in the literature.

    Conclusions:

    • The continuum model provides a mechanistic explanation for observed echographic intensity changes during myocardial contraction.
    • Cellular properties and their dynamic changes are key determinants of acoustic backscattering intensity variations.
    • The model serves as a foundation for future research into tissue motion and speckle pattern analysis in ultrasound imaging.