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Optimal transmit phasing on tissue background suppression in contrast harmonic imaging.

Che-Chou Shen1, Yi-Chun Hsieh

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

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|June 24, 2008
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This study introduces an optimal transmit phase method to reduce background noise in ultrasonic harmonic imaging. This technique significantly improves contrast-to-tissue ratio (CTR) for better diagnostic accuracy.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Acoustic Physics

Background:

  • Ultrasonic harmonic imaging offers superior image quality over linear imaging for clinical diagnostics.
  • Contrast-to-tissue ratio (CTR) in harmonic imaging is often limited by tissue background signals, including harmonic leakage and tissue harmonic signals.
  • Harmonic leakage arises from wideband transmit pulses used for enhanced axial resolution, while tissue harmonic generation further degrades CTR.

Purpose of the Study:

  • To investigate methods for suppressing tissue background signals in ultrasonic harmonic imaging.
  • To enhance the contrast-to-tissue ratio (CTR) by minimizing unwanted tissue harmonic signals and harmonic leakage.

Main Methods:

  • Developing a technique to select an optimal transmit signal phase for destructive cancellation.
  • Implementing destructive interference between tissue harmonic signals and leakage harmonic signals.
  • Evaluating the impact of the optimal suppression phase on harmonic amplitude from contrast agents and tissue signals.

Main Results:

  • The optimal suppression phase effectively reduces tissue background signal at the second harmonic band.
  • Harmonic amplitude from contrast agents remains largely unchanged with the selected transmit phase.
  • A significant improvement of approximately 5-dB in CTR is achieved due to the reduction in tissue background amplitude.

Conclusions:

  • Optimal transmit phasing is a viable strategy to suppress tissue background signals in harmonic imaging.
  • This method enhances CTR without negatively impacting the signal from contrast agents.
  • The findings suggest a significant advancement in ultrasonic diagnostic capabilities through improved image clarity.