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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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Modeling oxygen effects in tissue-preparation neuronal-current MRI.

Qingfei Luo¹, Ho-Ling Liu, Brent Parris

¹Department of Radiology, University of Chicago, Chicago, Illinois 60637, USA.

Magnetic Resonance in Medicine

|July 27, 2007

Summary

Oxygen

Area of Science:

Neuroimaging
Biophysics

Background:

Neuronal-current MRI (ncMRI) detects neuronal activity directly, avoiding hemodynamic contamination.
Oxygen's paramagnetic properties may influence ncMRI signals via relaxivity and susceptibility.
Quantifying oxygen's effect is crucial for interpreting ncMRI data in tissue preparation.

Purpose of the Study:

To investigate the impact of oxygen on ncMRI signals.
To estimate the magnitude of oxygen-induced signal changes.
To assess the relevance of these changes in prior tissue-preparation experiments.

Main Methods:

Formulated oxygen-induced MRI signal changes based on oxygen concentration, consumption rate, and imaging parameters.
Estimated maximum signal magnitude and phase changes under favorable conditions.

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Compared estimated oxygen-induced changes with experimentally observed ncMRI signals.

Main Results:

Maximum estimated oxygen-induced signal magnitude change: 0.32%.
Maximum estimated oxygen-induced phase change: 3.85 degrees.
Oxygen-induced signal changes were significantly smaller (0.03% magnitude, 0.03-0.07 degrees phase) than those in previous experiments.

Conclusions:

Oxygen has a negligible effect on ncMRI signals in previously reported tissue-preparation experiments.
The observed ncMRI signals in prior studies were tens to hundreds of times larger than potential oxygen-induced artifacts.
ncMRI remains a viable technique for detecting neuronal activity without significant oxygen contamination.