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DMAS Beamforming with Complementary Subset Transmit for Ultrasound Coherence-Based Power Doppler Detection in

Che-Chou Shen1, Yen-Chen Chu1

  • 1Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan.

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Summary

Delay-Multiply-and-Sum (DMAS) beamforming improves ultrasound Doppler signal-to-noise ratio (SNR) by reducing clutter. Combining DMAS with complementary subset transmit (CST) further enhances SNR for clearer imaging.

Keywords:
coherent plane-wave compounding (CPWC)complementary subset transmit (CST)delay-and-sum (DAS)delay-multiply-and-sum (DMAS)plane-wave (PW) imagingpower doppler detectionsignal coherence

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Signal Processing

Background:

  • Conventional plane-wave (PW) compounding uses Delay-and-Sum (DAS) beamforming, which can be limited by clutter artifacts in ultrafast ultrasound imaging.
  • Existing methods face a trade-off between clutter reduction and the number of PW transmit angles, potentially compromising image quality.

Purpose of the Study:

  • To introduce and evaluate a novel coherence-based power Doppler detection method using Delay-Multiply-and-Sum (DMAS) beamforming.
  • To assess the combined performance of DMAS beamforming and complementary subset transmit (CST) technique for noise reduction in ultrasound.

Main Methods:

  • Implemented Delay-Multiply-and-Sum (DMAS) beamforming, a technique that modulates signal coherence using a tunable 'p' value.
  • Integrated DMAS beamforming with the complementary subset transmit (CST) technique for enhanced noise reduction.
  • Performed clutter filtering on low-resolution images prior to DMAS to mitigate stationary tissue interference.

Main Results:

  • DMAS beamforming alone improved Doppler signal-to-noise ratio (SNR) by 8.2 dB compared to DAS.
  • Combining DMAS with CST achieved an additional 6-dB increase in Doppler SNR with sufficient ensemble averaging.
  • Experimental results validated simulation findings, demonstrating significant SNR and CNR improvements.

Conclusions:

  • DMAS beamforming offers a robust method for suppressing clutter and enhancing Doppler SNR in ultrasound imaging.
  • The synergy between DMAS and CST provides substantial noise reduction, leading to improved image quality.
  • Pre-DMAS clutter filtering is crucial for accurate flow signal detection when using multiplicative beamforming techniques.