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Parallel beamforming using synthetic transmit beams.

Torbjørn Hergum1, Tore Bjåstad, Kjell Kristoffersen

  • 1Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway. torbjorn.hergum@ntnu.no

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 3, 2007
PubMed
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Parallel beamforming in medical ultrasound can cause spatial shift variance. This study introduces synthetic transmit beams (STB) to restore shift invariance, enabling faster imaging without compromising quality.

Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Signal Processing

Background:

  • Parallel beamforming increases ultrasound acquisition rates.
  • Spatial shift variance is a significant flaw in parallel beamforming due to beam misalignment.
  • This variation degrades image quality and limits system performance.

Purpose of the Study:

  • To investigate methods for eliminating spatial shift variance in parallel beamforming.
  • To restore the shift invariance property in medical ultrasound imaging systems.
  • To enable higher acquisition rates without sacrificing image quality.

Main Methods:

  • Developed a novel method using synthetic transmit beams (STB) generated via signal interpolation.
  • Aligned parallel receive beams with real or synthetic transmit beams to correct misalignment.

Related Experiment Videos

  • Validated the STB method through simulations using Field II software and in vitro experiments.

    • Main Results:

    • Standard parallel beamforming was shown to reduce spatial shift invariance.
    • The proposed STB method effectively restored the shift invariance property.
    • Simulations and experiments confirmed the efficacy of the STB approach.

    Conclusions:

    • Synthetic transmit beams (STB) offer a viable solution to overcome spatial shift variance in parallel beamforming.
    • This technique allows for increased ultrasound acquisition rates while maintaining image quality.
    • The findings have implications for improving the performance of medical ultrasound systems.