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Related Concept Videos

Blood Flow01:29

Blood Flow

75.0K
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
75.0K
Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

2.1K
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.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
2.1K

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Related Experiment Video

Updated: Dec 2, 2025

Blood Flow Imaging with Ultrafast Doppler
05:57

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

8.1K

Blood Flow Imaging with Ultrafast Doppler.

Jerome Baranger1, Luc Mertens1, Olivier Villemain2

  • 1Translational Medicine Department, The Hospital for Sick Children, PGCRL Research Institute; The Labatt Family Heart Centre, Department of Pediatric, The Hospital for Sick Children, University of Toronto.

Journal of Visualized Experiments : Jove
|November 2, 2020
PubMed
Summary

Ultrafast Doppler ultrasound revolutionizes blood flow imaging by overcoming conventional limits. This advanced technique offers superior localization, quantification, and sensitivity for detecting minute blood flow velocities.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Conventional pulsed-Doppler ultrasound for blood flow assessment has limitations in distinguishing blood from tissue and presents a trade-off between localization and quantification.
  • Ultrafast ultrasound imaging, utilizing unfocused waves, has emerged as a significant advancement in recent decades.

Purpose of the Study:

  • To introduce the concept and parameters of ultrafast Doppler ultrasound.
  • To detail the physical principles of unfocused wave imaging and Doppler signal processing.
  • To explain tissue/blood flow separation algorithms and velocity extraction methods.

Main Methods:

  • Summarizing the physical principles of unfocused wave imaging.
  • Presenting Doppler signal processing steps, including tissue/blood flow separation.
  • Utilizing a research programmable ultrasound system for in vitro phantom experiments with blood-mimicking fluid.

Main Results:

  • Ultrafast ultrasound achieves a hundredfold increase in framerate (up to 10000 Hz).
  • It enables simultaneous blood flow mapping and precise velocity measurements at the single-pixel level (down to 50 µm).
  • Improved spatial and temporal data continuity enhances tissue/blood filtering, increasing sensitivity to low velocities (down to 1 mm/s).

Conclusions:

  • Ultrafast Doppler ultrasound overcomes the limitations of conventional methods, offering enhanced blood flow assessment.
  • The technique provides a complete field of view blood flow map with simultaneous precise velocity measurements.
  • Demonstrated in vitro and reviewed in vivo, ultrafast Doppler shows broad applicability in various organs.