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Related Concept Videos

Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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Related Experiment Video

Updated: Jun 28, 2026

Blood Flow Imaging with Ultrafast Doppler
05:57

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

Coded ultrasound for blood flow estimation using subband processing.

Fredrik Gran1, Jesper Udesen, Michael Bachmann Nielsen

  • 1Center for Fast Ultrasound Imaging, Ørsted DTU, Technical University of Denmark, Lyngby, Denmark. fg@oersted.dtu.dk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 7, 2008
PubMed
Summary
This summary is machine-generated.

This study demonstrates that coded excitation in medical ultrasound improves blood flow estimation. Broadband coded signals and subband processing enhance signal-to-noise ratio (SNR) and velocity accuracy compared to traditional methods.

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Area of Science:

  • Medical Ultrasound
  • Biomedical Engineering
  • Signal Processing

Background:

  • Traditional ultrasound velocity estimation relies on narrow-band signals, limiting SNR and spatial resolution.
  • Achieving adequate SNR and velocity estimation performance requires specific signal characteristics.
  • Separate transmissions are often needed for B-mode imaging and flow estimation, increasing scan time.

Purpose of the Study:

  • To investigate the efficacy of coded excitation for enhanced blood flow estimation in medical ultrasound.
  • To compare the performance of Barker and Golay codes against conventional narrow-band pulses.
  • To assess the potential for simultaneous B-mode imaging and velocity estimation using a single broadband signal.

Main Methods:

  • Utilized broadband coded excitation signals (Barker and Golay codes) instead of narrow-band pulses.
  • Employed subband processing by filtering the received broadband signal.
  • Conducted experiments using a 7 MHz linear array transducer on a circulating flow rig with a 60-degree beam-to-flow angle.

Main Results:

  • Coded excitation significantly reduced the mean relative standard deviation of velocity estimates compared to the narrow-band reference (e.g., 0.310% for 13-bit Barker code vs. 0.544%).
  • Barker codes (5 and 13 bits) and Golay codes (8-bit) demonstrated improved velocity estimation accuracy.
  • The broadband nature of coded excitation allowed for good spatial resolution post-compression, enabling simultaneous B-mode imaging and flow estimation without extra transmissions.

Conclusions:

  • Coded excitation, particularly with Barker and Golay codes, offers superior blood flow velocity estimation in ultrasound.
  • This approach enhances SNR and accuracy while enabling efficient, simultaneous B-mode imaging and Doppler velocimetry.
  • The findings suggest a time-saving and performance-enhancing alternative to conventional ultrasound techniques for cardiovascular imaging.