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Related Experiment Videos

Compact FPGA-based beamformer using oversampled 1-bit A/D converters.

Borislav Gueorguiev Tomov1, Jørgen Arendt Jensen

  • 1Center for Fast Ultrasound Imaging, Orsted, DTU, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark. bt@oersted.dtu.dk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|July 29, 2005
PubMed
Summary

This study introduces a compact medical ultrasound beamformer using oversampled 1-bit analog-to-digital converters. This novel architecture enables high-resolution B-mode imaging and color flow mapping with reduced hardware complexity.

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Area of Science:

  • Medical Imaging
  • Electrical Engineering
  • Biomedical Engineering

Background:

  • Medical ultrasound imaging relies on complex beamforming for image formation.
  • Existing beamformer architectures can be large and resource-intensive.
  • The need for compact and efficient ultrasound systems is growing.

Purpose of the Study:

  • To present a novel, compact medical ultrasound beamformer architecture.
  • To demonstrate the feasibility of using oversampled 1-bit analog-to-digital converters for beamforming.
  • To enable high-quality B-mode and color flow imaging with reduced hardware.

Main Methods:

  • Utilized oversampled 1-bit analog-to-digital converters (A/D).
  • Employed sparse sample processing for echo signal reconstruction in 512 focal points.

Related Experiment Videos

  • Implemented signal reconstruction using finite impulse response (FIR) filters on delta-sigma modulator output.
  • Leveraged field-programmable gate array (FPGA) for multichannel beamformer integration.

    • Main Results:

    • A 32-channel beamformer design occupies approximately 50% of mid-range FPGA resources.
    • The system is capable of operating at 129 MHz.
    • Simulations at 140 MHz yielded images with a dynamic range approaching 60 dB for a 3 MHz excitation frequency.

    Conclusions:

    • The proposed architecture offers a compact and efficient solution for medical ultrasound beamforming.
    • Oversampled 1-bit A/D converters and sparse processing are effective for high-quality image generation.
    • This approach facilitates the integration of multichannel beamformers into single FPGA devices, reducing system size and cost.