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Related Experiment Videos

Current-induced magnetic resonance phase imaging.

J Bodurka1, A Jesmanowicz, J S Hyde

  • 1Biophysics Research Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, 53226, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 4, 1999
PubMed
Summary
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Fast magnetic resonance imaging (MRI) technology detected electric current-induced phase changes in a phantom. This technique shows promise for directly imaging neuronal activity by detecting magnetic field alterations mimicking neuronal firing.

Area of Science:

  • Biophysics
  • Neuroimaging
  • Magnetic Resonance Imaging

Background:

  • Detecting neuronal activity non-invasively is crucial for neuroscience research.
  • Existing methods for monitoring neural signals have limitations in temporal or spatial resolution.
  • Pulsed electric currents can generate detectable magnetic fields.

Purpose of the Study:

  • To investigate the feasibility of using fast magnetic resonance imaging (MRI) to detect electric current-induced phase alterations.
  • To assess the sensitivity of MRI in detecting magnetic field changes associated with electrical activity.
  • To explore the potential of this technique for direct MRI detection of neuronal activity.

Main Methods:

  • Utilized fast MRI technology to image phase changes induced by pulsed current stimulation in a phantom.

Related Experiment Videos

  • Measured magnetic resonance phase images to detect signal alterations.
  • Calculated magnetic flux density produced by electric current within a voxel.

    • Main Results:

    • Successfully imaged pulsed current-induced phase changes, demonstrating feasibility.
    • Detected magnetic field strength changes of 1.7 +/- 0.3 nT.
    • Observed that current-induced phase changes varied with the wire's location within the voxel, consistent with calculations.

    Conclusions:

    • Fast MRI can detect electric current-induced phase changes.
    • The observed phase changes mimic those associated with neuronal firing.
    • This technique holds potential for direct, non-invasive MRI detection of neuronal electrical activity.