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Spatial coherence analysis applied to aberration correction using a two-dimensional array system.

James C Lacefield1, Robert C Waag

  • 1Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, USA.

The Journal of the Acoustical Society of America
|January 2, 2003
PubMed
Summary
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This study demonstrates how coherence analysis aids ultrasound aberration correction. Time-shift compensation improves echo coherence over larger separations, enhancing image focus quality.

Area of Science:

  • Medical Imaging
  • Acoustics
  • Signal Processing

Background:

  • Ultrasound aberration correction is crucial for diagnostic imaging quality.
  • Coherence analysis offers a method for evaluating and improving focusing in ultrasound.
  • Understanding coherence function behavior is key to optimizing aberration correction algorithms.

Purpose of the Study:

  • To compute complex degree of coherence functions using synthetic and measured ultrasound data.
  • To demonstrate the significance of coherence analysis for aberration correction.
  • To investigate the impact of normalization, signal-to-noise ratio, and time-shift compensation on coherence functions.

Main Methods:

  • Calculation of coherence functions from synthetic and measured ultrasound data.

Related Experiment Videos

  • Utilizing tissue-mimicking distributed aberration phantoms and a low f-number 2D array system.
  • Applying time-shift compensation for transmit and receive focusing.

    • Main Results:

    • Proper normalization of cross-correlation integrals is vital for accurate coherence analysis, especially with weak elements and receiver directivity.
    • Reduced signal-to-noise ratio due to element directivity can cause spikes in coherence functions.
    • Time-shift compensation enhances echo coherence over larger element separations, correlating with improved focus widths.

    Conclusions:

    • Coherence analysis provides valuable insights into ultrasound aberration correction.
    • Time-shift compensation effectively improves coherence for longer-range correlations, benefiting iterative focus compensation methods.
    • Aberration estimation algorithms can leverage these longer-range correlations for enhanced performance.