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A digital annular array prototype scanner for realtime ultrasound imaging.

F S Foster1, J D Larson, R J Pittaro

  • 1Hewlett Packard Laboratories, Palo Alto, CA 94304.

Ultrasound in Medicine & Biology
|January 1, 1989
PubMed
Summary
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This study details a new laboratory prototype ultrasound scanner using an annular array transducer. It demonstrates exceptional image resolution and beamforming capabilities for diagnostic imaging.

Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • The clinical role and optimal implementation of annular array transducers in diagnostic ultrasound are under active investigation.
  • Advancements in ultrasound equipment necessitate exploring novel transducer designs and beamforming techniques.

Purpose of the Study:

  • To describe the development of a laboratory prototype ultrasound scanner utilizing a 12-element, 4.5 MHz annular array transducer.
  • To evaluate the performance of a unique digital receive beamformer (DRB) and signal processor for enhanced ultrasound imaging.

Main Methods:

  • Development of a 12-element, 30 mm diameter, 4.5 MHz annular array transducer prototype.
  • Design and implementation of a novel digital receive beamformer (DRB) and signal processor.

Related Experiment Videos

  • Acoustic characterization of the mechanical probe and evaluation of focusing capabilities (f-number of 0.9).

    • Main Results:

    • Demonstrated focusing down to an f-number of 0.9.
    • Achieved measured angular beamwidths of 0.62 degrees at -6 dB and 2.8 degrees at -50 dB, aligning with theoretical predictions.
    • Acquired phantom and volunteer images exhibiting exceptional resolution and consistent speckle texture across depths.

    Conclusions:

    • The developed annular array ultrasound scanner prototype demonstrates superior resolution and beamforming capabilities.
    • The digital receive beamformer (DRB) and signal processing techniques contribute significantly to image quality.
    • Further investigation into optimizing transmit focal zones can enhance diagnostic ultrasound imaging.