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Functional MRI using steady-state arterial water labeling

S L Talagala1, D C Noll

  • 1Department of Radiology, University of Pittsburgh Medical Center, Pennsylvania 15213, USA.

Magnetic Resonance in Medicine
|February 20, 1998
PubMed
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Steady-state arterial water labeling (SS-AWL) measures brain blood flow changes during visual stimulation. This flow-sensitive functional MRI technique revealed a 17-35% increase in visual cortex blood flow.

Area of Science:

  • Neuroimaging
  • Physiology
  • Medical Physics

Background:

  • Functional MRI (fMRI) is crucial for studying brain activity.
  • Accurate measurement of cerebral blood flow (CBF) changes during activation is essential for fMRI.
  • Existing methods may have limitations in quantifying physiological parameters.

Purpose of the Study:

  • To introduce and validate steady-state arterial water labeling (SS-AWL) for flow-sensitive fMRI.
  • To quantify relative cerebral blood flow (CBF) changes in the visual cortex during visual stimulation.
  • To establish SS-AWL as a method for comparative fMRI studies.

Main Methods:

  • Flow-sensitive fMRI was performed using steady-state arterial water labeling (SS-AWL).
  • Arterial water labeling was achieved via flow-induced adiabatic fast passage.

Related Experiment Videos

  • Arterial water unlabeled and labeled images were acquired to measure relative CBF changes.

    • Main Results:

    • A signal intensity decrease of approximately 1.4% was observed in the visual cortex of arterial water labeled images during visual stimulation.
    • Cerebral blood flow in the visual cortex increased by 17% to 35% during visual stimulation, as measured by SS-AWL.
    • The method demonstrated the ability to quantify physiological parameters related to brain activation.

    Conclusions:

    • SS-AWL is an effective technique for flow-sensitive fMRI.
    • This method allows for the quantitative measurement of relative cerebral blood flow increases during brain activation.
    • SS-AWL facilitates comparative fMRI studies by providing physiological parameter quantitation.