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Measurement of Blood Pressure

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...

Equipments Used To Measure Blood Pressure

Equipments Used To Measure Blood Pressure

Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...

Average Velocity

Average Velocity

To calculate the other physical quantities in kinematics, we must introduce the time variable. The time variable allows us not only to state the position of the object during its motion, but also how fast it is moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position xi, we assign a particular time ti. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity. This...

Instantaneous Velocity - II

Instantaneous Velocity - II

Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of displacement with respect to time. Like average velocity, the instantaneous velocity is a vector with the dimensions of length per unit time. Instantaneous velocity can have both positive and negative values. The instantaneous velocity can be...

Escape Velocity

Escape Velocity

The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field?
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite...

Velocity of an Object

Velocity of an Object

Understanding how an object moves along a path requires distinguishing between motion over a time span and motion at a precise moment. A useful example is a vehicle traveling along a straight and level path, where its position at any given time is known. The initial step in analyzing this motion is to measure how far the vehicle travels over a fixed time period. This measurement, called average velocity, is computed by dividing the total change in position by the duration over which the change...

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Related Experiment Video

Updated: Feb 6, 2026

Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats

Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats

Published on: November 30, 2014

Measuring blood velocity using 4D-DSA: A feasibility study.

Gabe Shaughnessy¹, Sebastian Schafer², Michael A Speidel¹

¹Department of Medical Physics, University of Wisconsin, Madison, WI, USA.

Medical Physics

|August 14, 2018

Summary

This summary is machine-generated.

Four-dimensional digital subtraction angiography (4D-DSA) can measure blood flow and velocity in cerebral vasculature. This technique, using conventional angiography systems, shows feasibility for quantitative diagnosis and treatment planning.

Keywords:

4D-DSA blood flow blood velocimetry

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Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

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4D Microscopy of Yeast

Published on: April 28, 2019

Related Experiment Videos

Last Updated: Feb 6, 2026

Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats

Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats

Published on: November 30, 2014

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

4D Microscopy of Yeast

4D Microscopy of Yeast

Published on: April 28, 2019

Area of Science:

Medical Imaging
Cerebrovascular Imaging
Interventional Radiology

Background:

Four-dimensional digital subtraction angiography (4D-DSA) offers 3D time-resolved visualization of contrast passage in arteries.
This technique has potential applications beyond visualization, including quantitative hemodynamic assessment.

Purpose of the Study:

To evaluate the feasibility of using 4D-DSA data for measuring blood velocity and flow in the cerebrovasculature.
To assess the accuracy of 4D-DSA derived hemodynamic measurements.

Main Methods:

Utilized pulsatile signals in time concentration curves (TCCs) from 4D-DSA reconstructions to track contrast bolus movement.
Employed a Fourier-based algorithm to identify and follow pulsatility, with a Side Band Ratio (SBR) metric to enhance accuracy in weak signal regions.
Validated the method using 4D-DSA data from vascular phantoms and human studies.

Main Results:

Velocities calculated from 4D-DSA reconstructions in cerebrovascular phantoms were within 10% of flow meter measurements.
Blood velocity and flow values derived from human studies aligned with existing literature values.

Conclusions:

4D-DSA successfully provides temporal and spatial information on blood flow and vascular geometry using standard rotational angiography.
This feasibility study demonstrates that 4D-DSA data can accurately calculate blood velocity, correlating well with measured values.
The integration of 4D-DSA for hemodynamic assessment can advance quantitative diagnosis, treatment planning, and evaluation for cerebrovascular diseases.