blood flow velocity

Blood flow velocity measurements are robust against movement artifacts.

The technique measures blood flow velocity to deduce pulmonary artery pressure.

A blood flow velocity of more than 120 centimeters per second is suggestive of vasospasm.

We see blood flow velocities increase through a region of narrowing, like a finger pressing up against the end of a running garden hose.

It can also show decreased opening of the mitral valve leaflets, and increased blood flow velocity during diastole.

Therefore, facial processing has been studied using measurements of mean cerebral blood flow velocity in the middle cerebral arteries bilaterally.

Photoacoustic Doppler effect can be used to measure the blood flow velocity with the advantages of Photoacoustic imaging.

To evidence the blood flow velocity there are some techniques that the examiner can use to accelerate blood flow and show valvular function:

Due to a continuous monitoring of blood flow velocity, TCD offers an excellent temporal resolution in comparison to other neuroimaging techniques.

The capillary blood flow velocity also increased in each individual patient and the mean capillary flow velocity of all patients increased significantly.

Once the desired blood vessel is found, blood flow velocities may be measured with a pulsed Doppler effect probe, which graphs velocities over time.

Replies: Vasoconstriction increases blood pressure BEHIND the constriction, where the blood flow velocity is lower.

Functional TCD uses pulse-wave Doppler technology to record blood flow velocities in the anterior, middle, and posterior cerebral arteries.

Functional transcranial doppler sonography (fTCD) is a neuroimaging tool for measuring cerebral blood flow velocity changes due to neural activation during cognitive tasks.

Blood flow velocity is recorded by emitting a high-pitched sound wave from the ultrasound probe, which then bounces off of various materials to be measured by the same probe.

Specialised ultrasound equipment can also evaluate the blood flow velocity in the umbilical cord, looking to detect a decrease/absence/reversal or diastolic blood flow in the umbilical artery.

Even with recent advances in high strength functional micro-MRI, there is still around a 10-15 second lag time to reach peak signal intensity, making important information such as blood flow velocity quantification difficult to access.

The measurements of mean blood flow velocity (MFV) in the MCA main stem could potentially provide information about downstream changes at cortical and subcortical sites within the MCA territory.

The new system uses input responses called cortical long-term potentiation (CLTP) derived from Fourier analysis of mean blood flow velocity to trigger target face search from a computerized face database system.

Using TCD to monitor blood flow velocity in intercranial arteries, it was shown that a decrease in blood flow was associated with a decrease in vigilance and depletion of cognitive resources.

Compression stockings are elastic garments worn around the leg, compressing the limb, exerting pressure against the legs, reducing the diameter of distended veins, and causing an increase in venous blood flow velocity and valve effectiveness.

Transfusion therapy lowers the risk for a new silent stroke in children who have both abnormal cerebral artery blood flow velocity as detected by Transcranial Doppler and previous silent infarct even when the initial MRI showed no abnormality.

The simple act of increasing the number of red blood cells in blood may be associated with hyperviscosity syndrome which is characterized by increased blood viscosity and decreased cardiac output and blood flow velocity which results in the reduction of peripheral oxygen delivery.

In children prophylactic chronic red blood cell (RBC) transfusion therapy has been shown to be efficacious to a certain extent in reducing the risk of first stroke or silent stroke when transcranial Doppler (TCD) ultrasonography shows abnormal increased cerebral blood flow velocities.

A carotid Doppler machine is a device which can be used to measure blood flow velocities within the cervical carotid arteries, as well as the vertebral arteries and sometimes the subclavian arteries by means of non-invasive ultrasonic scanning in which the Doppler effect is utilized.