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Characterizing pulsatility in distal cerebral arteries using 4D flow MRI
Tomas Vikner1, Lars Nyberg1,2,3, Madelene Holmgren1
1Department of Radiation Sciences, Umeå University, Umeå, Sweden.
Summary
New four-dimensional (4D) flow MRI method measures distal cerebral arterial pulsatility. This technique reveals age-related increases in pulsatility, potentially linking it to cognitive decline and dementia.
Area of Science:
- Neuroimaging
- Cardiovascular Physiology
- Gerontology
Background:
- Age-related arterial stiffening is linked to cerebral microcirculation issues.
- Excessive cerebral arterial pulsatility may cause blood-brain barrier dysfunction, brain atrophy, and cognitive decline.
Purpose of the Study:
- To develop a non-invasive method for measuring pulsatility in distal cerebral arteries.
- To assess the relationship between age and distal cerebral arterial pulsatility.
Main Methods:
- Utilized four-dimensional (4D) flow magnetic resonance imaging (MRI).
- Developed a method to estimate a global composite flow waveform from numerous small cerebral arteries.
- Sampled arterial waveforms from thousands of cross-sections in distal cerebral vessels.
Main Results:
- The 4D flow MRI method demonstrated agreement with reference methods.
- The technique successfully captured age-dependent increases in distal cerebral arterial pulsatility.
- Validated the ability to measure pulsatility in the cerebral microcirculation.
Conclusions:
- The proposed 4D flow MRI method provides a novel way to assess distal cerebral arterial pulsatility.
- This approach can enhance understanding of how arterial pulsatility contributes to cognitive decline and dementia.
- Offers a potential tool for early detection and intervention strategies.
