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Related Experiment Videos

New demodulation filter in digital phase rotation beamforming.

Fabio Kurt Schneider1, Yang Mo Yoo, Anup Agarwal

  • 1Image Computing Systems Laboratory, Department of Electrical Engineering, University of Washington, Seattle, WA 98195-2500, USA.

Ultrasonics
|March 28, 2006
PubMed
Summary

A new multi-stage uniform coefficient (MSUC) filter significantly reduces hardware complexity in digital phase rotation beamforming by minimizing the need for lowpass filters. This innovation maintains comparable image quality in ultrasound machines.

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Area of Science:

  • Medical Imaging
  • Signal Processing
  • Ultrasound Technology

Background:

  • Digital quadrature demodulation is crucial in ultrasound machines due to its low sensitivity to phase delay errors.
  • Conventional finite impulse response (FIR) filters for harmonic removal in quadrature demodulation are computationally expensive and require significant hardware resources.
  • Existing methods for phase rotation beamforming face challenges with hardware complexity and computational load.

Purpose of the Study:

  • To introduce a novel quadrature demodulation filter to decrease hardware complexity in digital phase rotation beamforming.
  • To evaluate the efficiency and performance of the proposed filter against existing methods.
  • To maintain or improve image quality in ultrasound applications.

Main Methods:

Related Experiment Videos

  • Development of an efficient multi-stage uniform coefficient (MSUC) filter for harmonic component removal.
  • Comparison of the MSUC filter with directly implemented FIR (DI-FIR) and signed-power-of-two FIR (SPOT-FIR) lowpass filters.
  • Performance evaluation through simulations and phantom studies to assess hardware resource reduction and image quality.

Main Results:

  • The proposed MSUC filter reduces hardware resources by 93.9% compared to DI-FIR and 83.9% compared to SPOT-FIR filters.
  • Simulations demonstrated negligible degradation in image quality with the MSUC filter.
  • Phantom studies showed comparable spatial and contrast resolution to the DI-FIR approach.

Conclusions:

  • The novel MSUC filter offers a significant reduction in hardware complexity for quadrature demodulation in phase rotation beamforming.
  • The proposed method effectively removes harmonic components while preserving essential image quality metrics.
  • This approach presents a promising solution for more efficient and cost-effective ultrasound systems.