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Related Concept Videos

Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Related Experiment Video

Updated: Apr 19, 2026

Real-time Monitoring of High Intensity Focused Ultrasound HIFU Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound HMIFU
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Real-time Monitoring of High Intensity Focused Ultrasound HIFU Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound HMIFU

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Ultrasonic imaging of static objects through an aberrating layer using harmonic phase conjugation approach.

Raheleh Mirzania1, Kiyanoosh Shapoori2, Eugene Malyarenko3

  • 1Department of Physics, University of Windsor, Windsor, ON, Canada.

Ultrasonics
|January 3, 2015
PubMed
Summary

This study introduces Harmonic Phase Conjugation (HPC) for ultrasonic imaging of small objects behind barriers. The method achieves sub-millimeter accuracy, enabling new applications in biomedical and non-destructive testing fields.

Keywords:
Aberrating layerHarmonic phase conjugationImagingUltrasound

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Area of Science:

  • Acoustics
  • Ultrasonic Imaging
  • Wave Propagation

Background:

  • Detecting small objects behind aberrating layers is challenging with conventional methods.
  • Pulse-echo setups are limited by weak backscattered signals after passing through barriers.
  • Through-transmission offers a stronger signal but requires advanced reconstruction techniques.

Purpose of the Study:

  • To develop a novel image reconstruction approach for ultrasonic detection of sub-wavelength objects behind aberrating layers.
  • To utilize the Harmonic Phase Conjugation (HPC) technique for enhanced imaging.
  • To validate the method through numerical modeling and laboratory experiments.

Main Methods:

  • Employed a through-transmission experimental setup instead of pulse-echo.
  • Developed a numerical model to simulate acoustic field interaction and propagation.
  • Applied Harmonic Phase Conjugation (HPC) to reconstruct images from received acoustic fields.
  • Validated the method using numerical simulations with varying object configurations and experimental tests at 2 MHz.

Main Results:

  • Demonstrated the feasibility of imaging multiple scattering objects through a barrier using HPC.
  • Achieved better than 1mm accuracy in ultrasonic imaging through aberrating layers.
  • Numerical model accurately predicted experimental outcomes.

Conclusions:

  • The Harmonic Phase Conjugation (HPC) method is effective for imaging small objects behind barriers.
  • The developed approach shows promise for various biomedical and non-destructive testing (NDT) imaging applications.
  • Sub-millimeter accuracy achieved opens possibilities for high-resolution subsurface imaging.