Blood Flow Velocity
Blood Flow Velocity - Related Videos
10:56
Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats
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Cited by 2 •
2014
A method is presented to measure microcirculatory blood flow velocity in pulmonary cancer metastases of the pleural surface in rats in an automated fashion, using closed-chest pulmonary intravital microscopy. This model has potential to be used as a widespread tool to perform physiologic research on pulmonary metastases in rodents.
07:53
Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Cited by 12 •
2013
Micro-particle image velocimetry (μPIV) is used to visualize paired images of micro particles seeded in blood flows which are cross-correlated to give an accurate velocity profile. Shear rate, maximum velocity, velocity profile shape, and flow rate, each of which has clinical applications, can be derived from these measurements.
03:38
Developing a Cerebral Blood Flow Atlas for Blood Flow Mapping
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2025
Source: Tan, Z., et al., Construction and Application of Cerebral Functional Region-Based Cerebral Blood Flow Atlas Using Magnetic Resonance Imaging-Arterial Spin Labeling. J. Vis. Exp. (2024).This video demonstrates the method to construct a cerebral blood flow atlas by integrating magnetic resonance imaging or MRI-arterial spin labeling data with segmented brain regions, visualizing blood flow patterns, and quantifying flow levels across functional areas.
03:47
Functional Imaging of Cerebral Blood Flow Using Transcranial Doppler Ultrasound
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2025
Source: Hage, B. D. et. al., Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow. J. Vis. Exp. (2021) This video demonstrates the use of Doppler ultrasound as a functional imaging tool to measure cerebral blood flow velocity, or CBFV in real time. It highlights how frequency shifts in the middle cerebral artery during tasks like breath-holding reveal changes in CBFV, offering insights into brain activity and vascular dynamics.
01:11
Velocity and Acceleration in Steady and Unsteady Flow
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2025
In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time. The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over time.
FAQs
Cardiac output and vessel diameter affect how much blood reaches a location and how that flow is distributed through the vascular network. A change in either variable can therefore alter local movement even when the broader circulation remains connected. Considering both factors helps distinguish a flow change caused by altered pumping from one associated with vessel growth or remodeling.
Branching changes the total cross-sectional area available for blood movement. As flow enters a network with more branches, the amount of area through which blood is distributed changes, so local velocities may differ between larger parent vessels and their branches. This relationship helps connect vascular architecture with the physical conditions experienced throughout a developing circulation.
Moving blood generates fluid-induced shear stress along the vessel lining, including endothelial cells. Changes in velocity can therefore modify the mechanical signals that accompany vessel growth and remodeling. In developmental biology, this connection is important because it links a measurable feature of circulation with endothelial behavior and the formation of organized vascular patterns.
Pressure gradients provide a driving difference for blood movement, while vascular resistance opposes that movement. Altering either condition can change the velocity observed in a vessel, even if the vessel's position in the network is unchanged. Interpreting measurements alongside these factors helps researchers identify whether developmental changes reflect altered driving forces, resistance, or vascular structure.
Measurements from embryonic or growing vascular networks provide evidence about when circulation begins and how movement changes as vessels develop. Comparing velocity within the network can also help reveal patterns associated with vessel remodeling. These observations connect physical blood transport to the changing organization of the cardiovascular system during development.
Velocity measurements help relate blood movement to the delivery of oxygen through developing tissues. They also provide a physical readout that can be considered alongside vascular patterning and remodeling. Together, these relationships help researchers examine how circulation supports growing tissues and how blood movement participates in the formation of the developing cardiovascular system.