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Speckle-motion artifact under tissue shearing.

R L Maurice1, M Bertrand

  • 1Institut de Cardiologie de Montréal and Institut de Génie Biomédical, Ecole Polytechnique, Université de Montréal, Montreal, Quebec H3C 3A7, Canada. Roch@igb.polymtl.ca

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
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Speckle-motion artifact, a translation effect seen in ultrasound imaging, also occurs with shear motion. This artifact is proportional to shear angle and orientation, impacting velocity profile visualization and elastography.

Area of Science:

  • Medical Imaging
  • Acoustic Speckle Analysis
  • Ultrasound Physics

Background:

  • Speckle patterns in ultrasound imaging may not accurately reflect phantom motion, exhibiting translation artifacts during rotation.
  • The curvature of the imaging system's point spread function (PSF) has been identified as a cause of rotation-induced speckle-motion artifact.

Purpose of the Study:

  • To extend the analysis of speckle-motion artifact to include shear motion.
  • To propose a predictive model for lateral motion artifacts caused by shear.
  • To investigate the relationship between artifact characteristics and shear parameters.

Main Methods:

  • Development of a model based on the Fourier domain representation of speckles in tissue-motion compensated signals (Lagrangian speckle).
  • Analysis of artifact occurrence with shear motion, considering shear angle, orientation, frequency, and beamwidth.

Related Experiment Videos

  • Mathematical formulation relating artifact to the lateral derivative of the axial displacement field.

    • Main Results:

    • A lateral motion artifact model predicting artifact occurrence with shear motion was developed.
    • The artifact is proportional to the shear angle and its orientation, maximal for axial shear.
    • Artifacts increase with frequency and beamwidth, similar to rotational artifacts.

    Conclusions:

    • The proposed model explains speckle-motion artifact in shear, predicting apparent velocity profile distortions and artifact regions in elastography.
    • The spectral representation of Lagrangian speckle offers a geometrical interpretation of speckle decorrelation due to shear.
    • Understanding these artifacts is crucial for accurate interpretation of ultrasound velocity profiles and elastographic images.