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Functional MRI using steady-state arterial water labeling
1Department of Radiology, University of Pittsburgh Medical Center, Pennsylvania 15213, USA.
Abstract:
Flow-sensitive functional MRI (fMRI) was performed using steady-state arterial water labeling (SS-AWL). Arterial water labeling was accomplished by flow induced adiabatic fast passage. The signal intensity of the visual cortex in arterial water labeled images decreased by approximately 1.4% during visual stimulation of the brain. Acquisition of arterial water unlabeled and labeled images allows measurement of relative cerebral blood flow increase during brain activation. During visual stimulation, cerebral blood flow in the visual cortex increased by 17 to 35% as measured by SS-AWL. Quantitation of brain activation in terms of a physiological parameter using SS-AWL will facilitate comparative fMRI studies under different conditions.
Insights
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.
- 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.