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Ultrasonography01:17

Ultrasonography

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.
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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Harmonic spatial coherence imaging: an ultrasonic imaging method based on backscatter coherence.

Jeremy Dahl1, Marko Jakovljevic, Gianmarco F Pinton

  • 1Department of Biomedical Engineering, Duke University, Durham, NC, USA. jeremy.dahl@duke.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|May 2, 2012
PubMed
Summary
This summary is machine-generated.

We developed harmonic spatial coherence imaging (HSCI) for clearer ultrasound images. HSCI improves contrast and reduces noise, offering better visualization of tissues compared to traditional methods.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Harmonic imaging is crucial for clutter suppression in diagnostic ultrasound.
  • Second-harmonic echoes can still be affected by clutter, limiting image quality.
  • Short-lag spatial coherence (SLSC) imaging reduces clutter sensitivity due to low spatial coherence of clutter.

Purpose of the Study:

  • Introduce harmonic spatial coherence imaging (HSCI), a novel ultrasound technique.
  • Evaluate HSCI's performance against fundamental and harmonic B-mode imaging and SLSC imaging.
  • Assess HSCI's ability to improve image quality metrics like CNR and SNR.

Main Methods:

  • Developed HSCI based on the coherence of second-harmonic backscatter.
  • Utilized the same signals for HSCI and harmonic B-mode image construction.
  • Conducted in vivo imaging experiments on human cardiac and liver tissues.
  • Performed nonlinear simulations of a heart chamber model.

Main Results:

  • HSCI demonstrated improved contrast-to-noise ratio (CNR) in human cardiac tissue (up to 1.9) compared to fundamental B-mode (0.6), harmonic B-mode (0.9), and SLSC (1.5).
  • HSCI achieved higher signal-to-noise ratios (SNR) in human liver tissue (up to 3.4) versus harmonic B-mode (1.9).
  • HSCI exhibited enhanced speckle SNR and better delineation of structures.
  • Simulation results aligned with in vivo findings.

Conclusions:

  • HSCI offers superior imaging characteristics, including improved CNR and SNR.
  • The technique effectively suppresses clutter, leading to enhanced image quality.
  • HSCI provides better visualization of anatomical structures in ultrasound diagnostics.