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Measuring motion-induced B0 -fluctuations in the brain using field probes
Mads Andersen1,2, Lars G Hanson1,2, Kristoffer H Madsen1
1Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Denmark.
Magnetic Resonance in Medicine
|June 16, 2015
Summary
External magnetic field probes can help correct brain imaging artifacts caused by motion. This study shows probes reflect body motion well but breathing motion less so, guiding future artifact correction methods.
Area of Science:
- Medical Imaging
- Biophysics
- Magnetic Resonance Imaging
Background:
- Motion during ultrahigh-field brain imaging causes magnetic field fluctuations (B0).
- These fluctuations lead to significant artifacts in brain scans.
- Real-time sensing using external field probes offers a potential correction method.
Purpose of the Study:
- Evaluate the accuracy of interpolating magnetic field data from external probes to the brain.
- Quantify how well external probes reflect B0 fluctuations caused by body and breathing motion.
Main Methods:
- Compared external field probe measurements with scanner-acquired B0 maps.
- Used experiments involving breathing and shoulder movements.
- Performed realistic simulations of breathing-induced B0 fluctuations to test probe positions.
Main Results:
- External probes accurately reflected B0 fluctuations during shoulder movements.
- Correspondence was moderate for breathing-induced B0 fluctuations.
- Simulations highlighted the critical role of probe placement and advised against high-order corrections with numerous probes.
Conclusions:
- Developed methods for assessing magnetic field interpolation accuracy.
- External field measurements show promise for correcting imaging artifacts.
- Identified potential challenges and limitations in current approaches.
