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Related Concept Videos

Wave Parameters01:10

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Mathematically, the motion of a wave can be studied using a wavefunction. Consider a string oscillating up and down in simple harmonic motion, having a period T. The wave on the string is sinusoidal and is translated in the positive x-direction as time progresses. Sine is a function of the angle θ, oscillating between +A and −A and repeating every 2π radians. To construct a wave model, the ratio of the angle θ and the position x is considered.
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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Plane wave compounding with adaptive joint coherence factor weighting.

Nikunj Khetan1, Jerome Mertz2

  • 1Boston University Mechanical Engineering, 110 Cummington Mall, Boston, 02215, MA, USA.

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Summary

This study introduces Joint Coherence Factor (JCF) weighting to improve ultrasound imaging quality. By evaluating each signal

Keywords:
Angular coherenceCoherent plane wave compoundingSpatial coherenceSpeckle suppression

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Area of Science:

  • Ultrasound physics and medical imaging.
  • Acoustic signal processing.
  • Biomedical engineering.

Background:

  • Coherent Plane Wave Compounding (CPWC) is a standard ultrasound imaging technique.
  • Existing methods assess CPWC beamforming quality globally across apertures.
  • There is a need for more granular quality assessment in CPWC.

Purpose of the Study:

  • To introduce a novel, fine-grained approach for evaluating ultrasound beamforming quality.
  • To enhance Coherent Plane Wave Compounding (CPWC) image quality using a new metric.
  • To standardize image display for better comparison of different beamforming techniques.

Main Methods:

  • Developed a quality metric based on joint spatio-angular coherence for individual transmit/receive signal pairs.
  • Proposed Joint Coherence Factor (JCF) weighting for signals before coherent summation.
  • Implemented image display standardization using contrast matching for comparative analysis.

Main Results:

  • Demonstrated improved ultrasound image quality using fine-grained JCF weighting.
  • Showcased results from tissue-mimicking phantoms and human soft-tissue imaging.
  • JCF weighting outperformed alternative CPWC beamforming quality assessment methods.

Conclusions:

  • Fine-grained Joint Coherence Factor (JCF) weighting significantly enhances CPWC ultrasound image quality.
  • The proposed JCF method offers a more detailed approach to beamforming quality assessment.
  • Image standardization aids in the objective comparison of ultrasound imaging techniques.