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Updated: Mar 19, 2026

Blood Flow Imaging with Ultrafast Doppler
Published on: October 14, 2020
Estimation of Doppler shift frequency using selected phase information for high frame rate color flow mapping
Naohiko Tanaka1, Shigeo Ohtsuki2
1Department of Electronic Information Systems, Shibaura Institute of Technology, Faculty of Systems Engineering, 307 Fukasaku, Omiya, 330-8570, Japan. tanaka@se.shibaura-it.ac.jp.
This study introduces a novel signal processing technique to improve Doppler shift frequency estimation in high frame-rate color flow mapping. The method enhances performance by reducing interference from overlapping ultrasound echoes, especially with fewer pulse transmissions.
Area of Science:
- Medical Imaging
- Ultrasound Technology
- Signal Processing
Background:
- High frame-rate color flow mapping is crucial for visualizing blood flow.
- Overlapping ultrasound echoes cause interference, fluctuating phase, and disturbing Doppler shift frequency estimation.
- Existing methods struggle with interference, particularly when using fewer pulse transmissions.
Purpose of the Study:
- To present a new signal processing approach for estimating Doppler shift frequency in high frame-rate color flow mapping.
- To mitigate interference caused by overlapping ultrasound echoes.
- To improve Doppler shift frequency estimation accuracy with reduced pulse transmissions.
Main Methods:
- Developed a technique to eliminate disturbed phase information caused by echo interference.
- Utilized the instantaneous frequency of the echo signal as an index for interference influence.
- Validated the technique in vivo using radio-frequency echo signals from the carotid artery for simulation.
Main Results:
- The proposed technique effectively eliminates disturbed phase information.
- Instantaneous frequency serves as a reliable index for interference.
- Simulations demonstrated the technique's efficacy in estimating Doppler shift frequency.
Conclusions:
- The new signal processing technique enhances performance in high frame-rate color flow mapping.
- Limiting the number of transmitted pulses combined with this technique improves overall performance.
- This approach offers a more accurate method for Doppler shift frequency estimation in challenging ultrasound scenarios.
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