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Subarray coherence based postfilter for eigenspace based minimum variance beamformer in ultrasound plane-wave

Jinxin Zhao1, Yuanyuan Wang2, Jinhua Yu2

  • 1Department of Electronic Engineering, Fudan University, Shanghai 200433, China; Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region.

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Summary
This summary is machine-generated.

A new ultrasound imaging method combines eigenspace based minimum variance (ESBMV) beamforming with a subarray coherence based postfilter (SCBP) to enhance image quality. This ESBMV-SCBP approach significantly improves contrast and signal-to-noise ratio in plane-wave imaging.

Keywords:
CoherenceEigenspace based minimum variance beamformerPlane-wave imagingSubarrayWiener postfilter

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Signal Processing

Background:

  • Eigenspace based minimum variance (ESBMV) beamformers improve ultrasound image contrast but struggle in low signal-to-noise ratio (SNR) conditions due to signal subspace division difficulties.
  • Coherence factor (CF) methods can reduce sidelobes but their design is often influenced by subarray decorrelation, an aspect previously overlooked in postfilter development.

Purpose of the Study:

  • To introduce and evaluate a novel beamformer, the ESBMV-SCBP, designed to enhance ultrasound plane-wave imaging quality.
  • To address the limitations of existing ESBMV beamformers in low SNR scenarios by incorporating subarray coherence information.

Main Methods:

  • A new beamformer integrating the ESBMV method with a subarray coherence based postfilter (SCBP) was developed.
  • The performance of the ESBMV-SCBP beamformer was assessed using both simulated and experimental ultrasound data.
  • Quantitative metrics including contrast ratio (CR) and contrast-to-noise ratio (CNR) were used for evaluation.

Main Results:

  • The ESBMV-SCBP beamformer demonstrated superior imaging quality compared to the standard ESBMV method.
  • Simulated data showed improvements of 9.88 dB in CR and 0.97 in CNR.
  • Experimental results indicated CR improvements of 7.32 dB and 9.45 dB, and CNR improvements of 1.27 and 0.66 for two anechoic cysts.

Conclusions:

  • The proposed ESBMV-SCBP beamformer effectively enhances ultrasound plane-wave imaging quality, particularly in terms of contrast and noise reduction.
  • The method offers advantages over ESBMV-Wiener beamformers by producing less grainy speckle, thereby improving image contrast.
  • With minimal additional computational cost, the ESBMV-SCBP presents a viable technique for advancing ultrasound imaging performance.