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Related Experiment Videos

A digital beamformer for high-frequency annular arrays.

Jeremy A Brown1, Geoffrey R Lockwood

  • 1Department of Physics, Queens University, Kingston, Ontario, Canada. 7jab4@qlink.queensu.ca

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 26, 2005
PubMed
Summary

This study introduces advanced digital beamformers for ultrasound imaging, achieving precise timing for clearer images. The system demonstrates high-fidelity imaging in phantoms and biological samples.

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Area of Science:

  • Ultrasound Imaging Technology
  • Medical Device Engineering
  • Biomedical Signal Processing

Background:

  • High-resolution ultrasound imaging requires precise control over transmit and receive beamforming.
  • Existing beamforming systems face limitations in timing accuracy and dynamic range.
  • Development of advanced digital beamformers is crucial for next-generation ultrasound diagnostics.

Purpose of the Study:

  • To describe novel digital transmit and receive beamformers for a 7-element annular array operating at 45 MHz.
  • To evaluate the performance of these beamformers in terms of timing precision and image quality.
  • To demonstrate the system's capability for high-dynamic-range imaging of phantoms and biological tissues.

Main Methods:

  • Developed a transmit beamformer generating precise monocycle pulses with adjustable focal zones.

Related Experiment Videos

  • Implemented a dynamic receive beamformer utilizing variable frequency sampling with high-frequency field-programmable gate arrays (FPGAs).
  • Achieved precise timing synchronization using a precision quartz oscillator and FPGAs for signal summation.

    • Main Results:

    • Transmit beamformer achieved timing errors less than +/-125 ps.
    • Receive beamformer demonstrated a maximum timing error of less than +/-900 ps per channel.
    • The system successfully imaged wire phantoms and CD-1 mice, achieving a dynamic range of 60 dB.

    Conclusions:

    • The developed digital beamformers offer significant improvements in timing accuracy for ultrasound systems.
    • Variable frequency sampling is an effective technique for dynamic receive beamforming.
    • The system's performance validates its potential for high-quality, high-dynamic-range ultrasound imaging applications.