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Motion artifacts of pulse inversion-based tissue harmonic imaging.

Che-Chou Shen1, Pai-Chi Li

  • 1Department of Electrical Engineering, National Taiwan University, Taipei, ROC.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|September 24, 2002
PubMed
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Tissue motion significantly impacts harmonic imaging, reducing harmonic signal intensity and degrading image quality. Even with pulse inversion, filtering is needed, and 1-D motion correction is insufficient for nonaxial motion.

Area of Science:

  • Medical imaging
  • Ultrasound technology
  • Biomedical engineering

Background:

  • Pulse inversion (PI) is a technique used in ultrasound harmonic imaging to differentiate harmonic signals from fundamental signals.
  • Finite amplitude distortion can lead to harmonic generation, which is exploited for improved image quality.
  • Motion artifacts are a known challenge in ultrasound imaging, potentially degrading image quality.

Purpose of the Study:

  • To investigate the impact of tissue motion on pulse inversion harmonic imaging.
  • To evaluate the effects of axial and lateral motion on harmonic signal intensity and spectral leakage.
  • To assess the effectiveness of a 1-D correlation-based motion correction scheme.

Main Methods:

  • Simulated axial and lateral tissue motion.

Related Experiment Videos

  • Analysis of harmonic signal intensity relative to fundamental signal intensity.
  • Evaluation of spectral leakage and its impact on contrast resolution.
  • Application of a 1-D correlation-based motion correction algorithm.

    • Main Results:

    • Tissue harmonic signal intensity decreases significantly with both axial and lateral motion, more rapidly with axial motion.
    • Fundamental signal intensity increases with both axial and lateral motion, necessitating filtering.
    • Spectral leakage increases with motion, potentially degrading contrast resolution.
    • 1-D motion correction is inadequate for nonaxial motion.

    Conclusions:

    • Tissue motion is a significant source of artifacts in pulse inversion harmonic imaging.
    • Pulse inversion alone does not eliminate the need for fundamental signal filtering.
    • Advanced motion compensation strategies are required for accurate harmonic imaging in the presence of nonaxial motion.