Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow

Benjamin D. Hage; Edward J. Truemper; Gregory R. Bashford

doi:10.3791/62048

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow

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Bioengineering

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JoVE Journal Bioengineering

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow

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09:41 min

March 15, 2021

DOI: 10.3791/62048-v

Benjamin D. Hage¹, Edward J. Truemper², Gregory R. Bashford³

¹Department of Biological Systems Engineering,University of Nebraska-Lincoln, ²Department of Biological Systems Engineering,University of Nebraska-Lincoln, ³Department of Biological Systems Engineering,University of Nebraska-Lincoln

Overview

This Methods paper provides step-by-step instructions for using functional transcranial Doppler ultrasound (TCD) to conduct functional imaging experiments. Functional TCD is notable for its high temporal resolution in measuring changes in cerebral blood flow.

Key Study Components

Area of Science

Neuroscience
Functional Imaging
Cerebral Blood Flow Measurement

Background

Functional TCD complements other imaging modalities.
It measures stimulus-induced changes in cerebral blood flow.
Placement of a fixation device is essential for stable signal recording.
Practicing on volunteers is recommended to develop fine motor control.

Purpose of Study

To provide a protocol for conducting functional TCD experiments.
To enhance understanding of cerebral blood flow dynamics.
To improve the accuracy of TCD measurements in research settings.

Methods Used

Placement of a fixation device for stable recordings.
Use of transcranial Doppler ultrasound to locate the middle cerebral artery.
Steady holding of the transducer while making slow adjustments.
Practice on multiple volunteers to refine technique.

Main Results

High temporal resolution of functional TCD allows for detailed analysis of blood flow changes.
Successful identification of the middle cerebral artery enhances measurement accuracy.
Improved motor control leads to better signal stability.
Step-by-step guidance facilitates reproducibility of the method.

Conclusions

Functional TCD is a valuable tool for studying cerebral blood flow.
Proper technique and practice are critical for successful implementation.
This protocol can aid researchers in conducting functional imaging experiments.

Frequently Asked Questions

What is functional transcranial Doppler ultrasound?

Functional TCD is a non-invasive imaging technique that measures cerebral blood flow changes in real-time.

How does functional TCD compare to other imaging modalities?

It offers higher temporal resolution than many other functional imaging techniques.

What is the importance of a fixation device in TCD experiments?

A fixation device ensures a stable signal during the recording process.

How can I improve my TCD technique?

Practice on multiple volunteers to develop fine motor control and improve accuracy.

What are the main challenges in using TCD?

Finding the middle cerebral artery and maintaining steady transducer positioning can be challenging.

Is prior experience necessary for conducting TCD experiments?

While not mandatory, prior practice can significantly enhance the quality of measurements.

Functional transcranial Doppler ultrasound complements other functional imaging modalities, with its high temporal resolution measurement of stimulus-induced changes in cerebral blood flow within the basal cerebral arteries. This Methods paper gives step-by-step instructions for using functional transcranial Doppler ultrasound to perform a functional imaging experiment.

This protocol forms the basis for a functional TCD experiment because almost all functional TCD experiments require placement of a fixation device to record a stable signal over an extended period of time. The main advantage of functional TCD is its high temporal resolution measurement of changes in cerebral blood flow. Finding the middle cerebral artery using TCD takes practice.

It is crucial to hold the transducer steady and move very slowly. The fine motor control needed for making small adjustments in transducer position and direction takes time to develop. Practice on as many volunteers as you can find.

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