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Related Experiment Videos

Blocked element compensation in phased array imaging.

P C Li1, S W Flax, E S Ebbini

  • 1Dept. of Electr. Eng. and Sci., Michigan Univ., Ann Arbor, MI.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1993
PubMed
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This study introduces an algorithm to reduce ultrasound imaging artifacts caused by blocked phased array elements. The method improves image quality and lesion detection, even surpassing full array performance.

Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Signal Processing

Background:

  • Large aperture ultrasound arrays face artifacts from blocked elements due to acoustic windows.
  • These artifacts degrade spatial and contrast resolution in clinical imaging.
  • Existing methods struggle to fully compensate for blocked elements.

Purpose of the Study:

  • To develop and validate an algorithm for minimizing beamforming artifacts caused by blocked phased array elements.
  • To improve the spatial and contrast resolution of ultrasound images.
  • To enhance the detection of low contrast lesions in clinical applications.

Main Methods:

  • Proposed an algorithm utilizing multiple receive beams and the total-least-squares method.
  • Modified the algorithm with scatterer statistics for blocked element compensation on distributed sources.

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  • Validated the method through simulations and experimental results.

    • Main Results:

    • The algorithm effectively reduced point spread function imperfections.
    • Compensated images achieved quality comparable to full array images.
    • Even full array images showed improvement by removing sidelobe contributions.

    Conclusions:

    • The proposed algorithm successfully compensates for blocked phased array elements in ultrasound imaging.
    • This technique enhances image quality and lesion detection capabilities.
    • The method offers a significant advancement for large phased-array aperture applications.