Realistically Modeled Transcranial Magnetic Stimulation Coils for Lorentz Force and Stress Calculations During MRI

Transcranial magnetic stimulation (TMS) uses transient magnetic field to activate brain regions by inducing an electric field across and an electric current through neurons. Functional magnetic resonance imaging (fMRI) allows the measurement of brain activity making it a potentially useful tool in c...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2013-07, Vol.49 (7), p.3426-3429
Main Authors: Crowther, L. J., Porzig, K., Hadimani, R. L., Brauer, H., Jiles, D. C.
Format: Article
Language:English
Subjects:
Brain
Coil
Coils
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
functional magnetic resonance imaging (fMRI)
Lorentz covariance
Lorentz force
Magnetic resonance imaging
Magnetic stimulation
Magnetism
Magnetomechanical effects
Materials science
NMR
Nuclear magnetic resonance
Other topics in materials science
Physics
Stress
transcranial magnetic stimulation (TMS)
Windings
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Description
Summary:Transcranial magnetic stimulation (TMS) uses transient magnetic field to activate brain regions by inducing an electric field across and an electric current through neurons. Functional magnetic resonance imaging (fMRI) allows the measurement of brain activity making it a potentially useful tool in combination with TMS to analyze the sites of stimulation within the brain. TMS typically utilizes a high current pulse up to 8 kA at approximately 2.5 kHz to induce an electric field inside the brain sufficient for neural stimulation. Lorentz forces are created on the TMS coil and are increased in the presence of a high external magnetic field from the MRI magnet. This study implements a realistic coil model developed from X-ray images of a commercial figure-of-eight TMS coil. The Lorentz forces and stress profile inside the current carrying material of this realistically modeled coil are presented. Results show that the maximum Lorentz force density is significantly larger than previously calculated, by a factor of more than 3.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2013.2247578