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Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
Published on: January 15, 2018
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Sidelobe reduction for plane wave compounding with a limited frame number.
Wei Guo1, Yuanyuan Wang2,3, Guoqing Wu1
1Department of Electronic Engineering, Fudan University, Shanghai, China.
Biomedical Engineering Online
|July 15, 2018
Summary
This study introduces a new method to reduce sidelobes in plane wave compounding (PWC) ultrasound imaging. The technique improves image quality by effectively suppressing artefacts without sacrificing frame rate, crucial for ultrafast imaging.
Area of Science:
- Medical Imaging
- Ultrasound Technology
- Signal Processing
Background:
- Ultrasound plane wave imaging (PWI) suffers from off-axis artefacts due to high sidelobes, blurring image details.
- Plane wave compounding (PWC) reduces sidelobes but requires many frames, leading to unacceptable frame rate loss in ultrafast imaging.
- Exploiting inter-frame coherence is key to reducing the frame number needed for effective PWC.
Purpose of the Study:
- To develop a novel sidelobe suppression method for PWC using a limited frame number.
- To enhance image quality in ultrafast ultrasound imaging by addressing artefact limitations.
- To introduce a metric for inter-frame coherence to optimize PWC.
Main Methods:
- A global effective distance-based method is proposed for sidelobe suppression in PWC.
- Global effective distance is computed using a sparse representation-based algorithm to measure inter-frame coherence.
- Sidelobe localization and suppression are achieved using target-dependent weighting factors.
Main Results:
- The proposed method demonstrated a 19 dB reduction in peak sidelobe level compared to normal PWC.
- Contrast ratio was enhanced by over 10% in both simulated and experimental PWC data.
- Performance was validated using point spread function tests, simulations, and phantom studies.
Conclusions:
- The developed global effective distance-based method significantly enhances PWC image quality.
- This approach offers a promising solution for sidelobe reduction in limited-frame-number PWC.
- The method is effective for ultrafast imaging modalities requiring high frame rates.
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