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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Contrast Imaging in Mouse Embryos Using High-frequency Ultrasound
10:39

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Published on: March 4, 2015

Phase-dependent dual-frequency contrast imaging at sub-harmonic frequency.

Che-Chou Shen1, Chih-Hao Cheng, Chih-Kuang Yeh

  • 1Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 24, 2011
PubMed
Summary
This summary is machine-generated.

Dual-frequency excitation enhances subharmonic imaging by improving contrast-to-tissue ratio (CTR) for ultrasound contrast agents (UCAs). This method boosts signal intensity and CTR, offering potential for better ultrasound imaging quality.

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Area of Science:

  • Ultrasound Imaging
  • Acoustics
  • Biomedical Engineering

Background:

  • Sub-harmonic imaging offers higher contrast-to-tissue ratio (CTR) but suffers from low signal intensity from ultrasound contrast agents (UCAs).
  • Existing methods require optimization to improve signal quality and CTR in sub-harmonic ultrasound imaging.

Purpose of the Study:

  • To propose and evaluate a dual-frequency excitation method to enhance CTR in sub-harmonic imaging.
  • To investigate the generation of sub-harmonic components from nonlinear responses of UCAs using dual-frequency excitation.

Main Methods:

  • Utilized a dual-frequency excitation pulse composed of two sinusoids (f₁ and f₂) to drive nonlinear UCA responses.
  • Exploited the envelope component at (f₁ - f₂) to generate sub-harmonic signals, with f₂ chosen at twice the UCA resonance frequency.
  • Optimized sub-harmonic generation by tuning phase terms between second- and third-order nonlinear components.

Main Results:

  • Dual-frequency excitation significantly improved CTR compared to conventional tone-burst methods.
  • CTR showed periodic dependence on the relative phase of excitation frequencies, with up to 9.1 dB variation.
  • The echo from the envelope component demonstrated specificity for UCAs, suggesting improved SNR and CTR.

Conclusions:

  • Dual-frequency excitation is a promising technique for enhancing CTR and SNR in sub-harmonic ultrasound imaging.
  • The method's effectiveness depends on factors like frequency-dependent attenuation and UCA resonance characteristics.
  • Further optimization of dual-frequency parameters can maximize CTR improvements in ultrasound contrast imaging.