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Related Experiment Videos

Third harmonic transmit phasing for tissue harmonic generation.

Che-Chou Shen1, Yu-Chun Wang, Yi-Chun Hsieh

  • 1Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan. choushen@mail.ntust.edu.tw

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 28, 2007
PubMed
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This study introduces a new method using 3f0 transmit phasing to control tissue harmonic signals. By adjusting the phase between frequency components, researchers can enhance or suppress harmonic signals for better ultrasound imaging.

Area of Science:

  • Ultrasound Physics
  • Acoustic Imaging
  • Biomedical Engineering

Background:

  • Tissue harmonic signals are generated by nonlinear acoustic propagation.
  • Harmonic generation involves frequency-sum and frequency-difference components.
  • These components are sensitive to the phase of spectral signals.

Purpose of the Study:

  • To propose and investigate a novel approach for modifying tissue harmonic signal amplitude.
  • To explore the effects of 3f0 transmit phasing on harmonic generation.
  • To achieve harmonic enhancement or suppression for improved ultrasound imaging.

Main Methods:

  • Experimental and simulation-based investigation of 3f0 transmit phasing.
  • Controlled manipulation of the relative phase between frequency-sum and frequency-difference components.

Related Experiment Videos

  • Analysis of second harmonic signal amplitude and beam pattern.

    • Main Results:

    • Relative phasing significantly alters second harmonic signal amplitude.
    • Harmonic enhancement achieved approximately 6 dB increase in amplitude and improved beam pattern.
    • Harmonic suppression reduced the second harmonic signal by about 11 dB.

    Conclusions:

    • 3f0 transmit phasing offers a method to control tissue harmonic generation.
    • This technique can improve signal-to-noise ratio in tissue harmonic imaging.
    • Potential applications include enhancing contrast-agent imaging by suppressing tissue harmonic background.