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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Related Experiment Video

Updated: Sep 8, 2025

Author Spotlight: Noninvasive Cerebral Blood Flow Determination in Human Functional Brain Region for Diagnosis of Neurological Disorders
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Assessing cerebral microvascular pulsatility using flow pulsatile-resolved pseudo-continuous arterial spin labeling

Tianrui Zhao1,2, Jianing Tang1,2, Yining He1,2

  • 1Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.

Magnetic Resonance in Medicine
|July 22, 2025
PubMed
Summary

A new technique, flow pulsatile-resolved pseudo-continuous arterial spin labeling (FPR-pCASL), noninvasively assesses cerebral microvascular pulsatility. This reliable method shows promise for understanding blood flow dynamics and aging effects.

Keywords:
arterial spin labelingcerebral microvascular pulsationglymphatic functionpCASLpulsatility index

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Area of Science:

  • Neuroimaging
  • Cardiovascular Physiology
  • Biomedical Engineering

Background:

  • Cerebral microvascular pulsatility is crucial for brain health.
  • Assessing microvascular pulsatility noninvasively is challenging.
  • Existing methods may lack precision or invasiveness.

Purpose of the Study:

  • To develop and validate a novel flow pulsatile-resolved pseudo-continuous arterial spin labeling (FPR-pCASL) technique.
  • To enable noninvasive assessment of cerebral microvascular pulsatility.
  • To investigate the impact of aging on microvascular pulsatility.

Main Methods:

  • Implemented FPR-pCASL using a pCASL sequence with 3D gradient and spin echo acquisition.
  • Synchronized cardiac pulse signals with pCASL imaging for cardiac phase-binning.
  • Conducted numerical simulations and in vivo experiments to assess confounding factors and optimize parameters.
  • Evaluated test-retest reproducibility, cross-validated with phase-contrast MRI, and performed an aging study.

Main Results:

  • Numerical simulations indicated minimal confounding effects (labeling efficiency <3%, arterial transit time <2%) from cardiac variations on pCASL signals.
  • Demonstrated good test-retest reproducibility for microvascular pulsatility index (PI) (ICC=0.86).
  • Showed strong correlations between FPR-pCASL derived PI and macrovascular PIs from phase-contrast MRI.
  • Observed significantly higher microvascular PI in elderly adults compared to younger adults.

Conclusions:

  • The FPR-pCASL technique is feasible and reliable for directly assessing cerebral microvascular pulsatility.
  • This method offers a noninvasive tool for studying microvascular function.
  • Findings suggest potential age-related changes in cerebral microvascular pulsatility.