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Related Experiment Videos

Towards quantification of blood-flow changes during cognitive task activation using perfusion-based fMRI.

Toralf Mildner1, Stefan Zysset, Robert Trampel

  • 1Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstr. 1a, 04103 Leipzig, Germany. mildner@cbs.mpg.de

Neuroimage
|June 28, 2005
PubMed
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Multi-slice perfusion-based functional MRI (p-fMRI) using continuous arterial spin labeling effectively measures cognitive task-induced changes in cerebral blood flow (CBF). This method revealed significant CBF increases, offering an alternative to BOLD imaging.

Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Physiology

Background:

  • Functional magnetic resonance imaging (fMRI) is crucial for understanding brain activity.
  • Blood oxygen level dependent (BOLD) fMRI is a common technique, but its indirect measure of neural activity has limitations.
  • Perfusion-based fMRI (p-fMRI) offers a more direct measure of brain function through cerebral blood flow (CBF).

Purpose of the Study:

  • To demonstrate the utility of multi-slice perfusion-based fMRI (p-fMRI) using continuous arterial spin labeling (CASL) for cognitive tasks.
  • To compare the findings of p-fMRI with conventional BOLD-fMRI.
  • To quantify task-related changes in CBF.

Main Methods:

  • Utilized a color-word Stroop task, a standard cognitive paradigm.

Related Experiment Videos

  • Employed continuous arterial spin labeling (CASL) for perfusion measurements, interrupting only during image acquisition.
  • Acquired BOLD contrast data using conventional gradient-recalled echo (GE) echo planar imaging (EPI) for comparison.

    • Main Results:

    • BOLD-fMRI positive activations corresponded to negative signal changes in p-fMRI, indicating increased CBF due to enhanced transport of inverted water spins.
    • Observed regional differences in activation localization and sensitivity between p-fMRI and BOLD-fMRI, notably in the inferior frontal and intraparietal sulci.
    • Quantified multi-subject CBF increases during cognitive activation, showing an order of 20-30% rise.

    Conclusions:

    • Multi-slice p-fMRI with CASL is a viable method for detecting cognitive task-related changes in CBF.
    • p-fMRI provides complementary information to BOLD-fMRI, with distinct regional sensitivities.
    • The study successfully quantified task-induced CBF increases, highlighting the potential of p-fMRI in cognitive neuroscience research.