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Coherent-array imaging using phased subarrays. Part I: basic principles.

Jeremy A Johnson1, Mustafa Karaman, Butrus T Khuri-Yakub

  • 1Stanford University, Image Guidance Laboratory, Stanford, CA, USA. public@drjjo.com

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 4, 2005
PubMed
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Phased subarray (PSA) imaging offers a new approach to coherent array imaging. This method reduces hardware complexity while maintaining high image quality, approaching that of full phased array (FPA) imaging.

Area of Science:

  • Medical imaging
  • Signal processing
  • Array signal processing

Background:

  • Front-end hardware complexity in coherent array imaging systems increases with the number of simultaneously active array elements.
  • Conventional full phased array (FPA) imaging provides superior image quality but demands high hardware complexity.
  • Classical synthetic aperture (CSA) imaging minimizes hardware complexity but results in diminished image quality.

Purpose of the Study:

  • To introduce a novel coherent array imaging technique, phased subarray (PSA) imaging.
  • To reduce the front-end hardware complexity of coherent array imaging systems.
  • To achieve high image quality comparable to FPA imaging with reduced hardware.

Main Methods:

  • PSA imaging employs partial transmit and receive beam-forming using subsets of adjacent array elements.

Related Experiment Videos

  • Active channels are multiplexed across the full array, acquiring reduced beams from each subarray.
  • Low-resolution subarray images undergo lateral upsampling, interpolation, weighting, and coherent summation.

    • Main Results:

    • PSA imaging significantly reduces the number of active channels required.
    • The method achieves image quality closely approximating that of FPA imaging.
    • Hardware complexity is substantially decreased compared to FPA imaging.

    Conclusions:

    • Phased subarray (PSA) imaging presents an effective solution for reducing hardware complexity in coherent array imaging.
    • This technique offers a balance between hardware efficiency and high-resolution imaging capabilities.
    • PSA imaging shows promise for advancing the practicality and accessibility of coherent array imaging systems.