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In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
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Assessing cerebral arterial pulse wave velocity using 4D flow MRI.

Cecilia Björnfot1, Anders Garpebring1, Sara Qvarlander1

  • 1Department of Radiation Sciences, Umeå University, Umeå, Sweden.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|April 15, 2021
PubMed
Summary

Intracranial arterial stiffening, a marker of cerebrovascular dysfunction, can now be measured using a novel 4D flow MRI technique. This method reliably detects age-related increases in pulse wave velocity within the brain's arteries.

Keywords:
Atherosclerosisarterial stiffnessarteriosclerosismagnetic resonance imagingneurovascular dysfunction

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Area of Science:

  • Biomedical Engineering
  • Neuroimaging
  • Cardiovascular Research

Background:

  • Intracranial arterial stiffening is an early indicator of cerebrovascular dysfunction.
  • Stiffening increases pulse wave velocity, potentially harming brain function.
  • Previous measurements focused on extracranial arteries, lacking intracranial data.

Purpose of the Study:

  • To develop and validate a 4D flow MRI method for measuring intracranial pulse wave velocity (PWV).
  • To assess the feasibility of non-invasively quantifying PWV within the cerebral vasculature.

Main Methods:

  • A novel 4D flow MRI technique was developed to estimate PWV in the intracranial vascular tree.
  • The method uses the vascular branching structure and temporal waveform shifts in an optimization framework.
  • Internal consistency tests were performed to assess method stability.

Main Results:

  • The 4D flow MRI method demonstrated stability in internal consistency tests.
  • The technique showed sufficient sensitivity to detect age-related increases in intracranial PWV.
  • This represents the first non-invasive measurement of PWV within the intracranial "target-organ".

Conclusions:

  • The developed 4D flow MRI method enables non-invasive measurement of intracranial PWV.
  • This technique can serve as a valuable tool for assessing cerebrovascular health and aging.
  • Further research can explore the link between intracranial PWV and neurological diseases.