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Synthetic aperture techniques with a virtual source element.

C H Frazier1, W R O'Brien

  • 1Department of Electrical and Computer Engineering, University of Illinois, Urbana, IL 61801, USA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 5, 2008
PubMed
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A novel ultrasound imaging technique enhances depth of field by treating the focal point as a virtual element. This synthetic aperture method improves lateral resolution beyond the transducer focus while maintaining acceptable signal-to-noise ratio.

Area of Science:

  • Ultrasound Imaging
  • Medical Imaging
  • Signal Processing

Background:

  • Conventional B-mode and synthetic aperture ultrasound imaging have limitations in depth of field with highly focused transducers.
  • Achieving high lateral resolution beyond the transducer's focal zone is a significant challenge in ultrasound imaging.
  • Tradeoffs exist between lateral resolution, sidelobe levels, system complexity, and signal-to-noise ratio (SNR) in array imaging.

Purpose of the Study:

  • To introduce and evaluate a new ultrasound imaging technique combining B-mode and synthetic aperture methods.
  • To overcome the limited depth of field inherent in highly focused transducer systems.
  • To investigate the use of the focal point as a virtual element for enhanced synthetic aperture focusing.

Main Methods:

Related Experiment Videos

  • Pulse-echo radiofrequency (RF) signals were acquired using a 15-MHz focused transducer.
  • Experiments utilized targets including a tungsten wire, nylon wires in a tissue-mimicking phantom, and cyst targets.
  • Synthetic aperture focusing techniques were applied, treating the focal point as a virtual element.

    • Main Results:

    • The proposed technique successfully improves lateral resolution beyond the transducer's natural focus.
    • Apodization was found to reduce sidelobes at the cost of lateral resolution, consistent with classical synthetic aperture imaging.
    • Resolution comparable to the focal region was achieved at depths of 3, 5, and 7 mm beyond focus, with acceptable SNR.
    • Grating lobes were not significant until spatial sampling exceeded one wavelength without beam steering.

    Conclusions:

    • The focal point can effectively function as a virtual transducer element when applying synthetic aperture processing.
    • This novel approach enhances the depth of field and lateral resolution in ultrasound imaging.
    • The virtual source exhibits behavior analogous to actual transducer elements in synthetic aperture processing.