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Related Experiment Video

Updated: May 30, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Transmit beamforming for optimal second-harmonic generation.

Halvard Hoilund-Kaupang1, Svein-Erik Masoy

  • 1Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway. halvard.kauping@ntnu.no

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 24, 2011
PubMed
Summary
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This study compares 3.5 MHz and 11 MHz ultrasound imaging. High frequencies show reduced ability to suppress near-field echoes in heterogeneous tissue, impacting image quality.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Acoustics

Background:

  • Second-harmonic ultrasound imaging utilizes nonlinear acoustic properties for improved image resolution and reduced artifacts.
  • Transducer characteristics and medium properties significantly influence second-harmonic generation and echo suppression.

Purpose of the Study:

  • To compare second-harmonic generation and near-field echo suppression between 3.5 MHz and 11 MHz ultrasound transmit beams.
  • To evaluate the impact of medium attenuation on the performance of different ultrasound frequencies.

Main Methods:

  • A simulation study using the KZK equation for computational efficiency.
  • Modeling of circular-symmetric transducers with varying f-numbers and focal depths.
  • Simulation of a homogeneous muscle tissue medium with nonlinear elasticity and power-law attenuation.

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Related Experiment Videos

Last Updated: May 30, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Main Results:

  • Second-harmonic generation was verified to be proportional to the square of transmit pressure.
  • Identical second-harmonic field shapes were observed for equal-wavelength aperture and focal depths at different frequencies in a medium with f1 attenuation.
  • Deviations occurred with f1.1 attenuation, where the higher frequency (11 MHz) performed worse than the lower frequency (3.5 MHz).

Conclusions:

  • High-frequency ultrasound (11 MHz) is less effective at suppressing near-field echoes compared to low-frequency ultrasound (3.5 MHz) in heterogeneous media.
  • Medium attenuation characteristics influence the performance differences between high and low ultrasound frequencies.
  • Transducer configuration and medium properties are critical factors in optimizing second-harmonic ultrasound imaging.