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Related Experiment Videos

Transmit aperture processing for nonlinear contrast agent imaging

S Krishnan1, M O'Donnell

  • 1Electrical Engineering and Computer Science Department and Bioengineering Program, University of Michigan, Ann Arbor, Michigan, 48109-2122, USA.

Ultrasonic Imaging
|April 1, 1996
PubMed
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Nonlinear imaging uses ultrasound contrast agents like bubbles to see blood. A new method, alternate phasing, improves image contrast by reducing unwanted signals, enhancing bubble visualization in tissues.

Area of Science:

  • Medical Imaging
  • Acoustics
  • Biomedical Engineering

Background:

  • Nonlinear contrast agents (e.g., bubbles) enhance ultrasound backscatter from blood.
  • Nonlinear imaging methods (harmonic, difference frequency) increase contrast but suffer from reduced clarity due to linear tissue reflections at the receive frequency.

Purpose of the Study:

  • To improve contrast in nonlinear ultrasound imaging.
  • To suppress unwanted linear signals transmitted at the receive frequency.

Main Methods:

  • Proposed transmit aperture processing to reduce signal transmission at the receive frequency.
  • Presented alternate phasing as a specific implementation of transmit aperture processing.

Main Results:

Related Experiment Videos

  • Simulation results demonstrated significant contrast improvement between tissue and bubbles.
  • Alternate phasing effectively suppressed linear reflections at the receive frequency.

    • Conclusions:

    • Transmit aperture processing, specifically alternate phasing, is a viable method for enhancing contrast in nonlinear ultrasound imaging.
    • This technique improves the visualization of nonlinear contrast agents against tissue backgrounds.