Journal
MAGNETIC RESONANCE IMAGING
Volume 23, Issue 5, Pages 647-651Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.mri.2005.02.014
Keywords
MRI; Lorentz force; imaging; electrical current
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This project was designed to assess whether MRI imaging could detect Lorentz-force-induced motion in conductive samples. Experiments were performed by applying alternating voltages across 2 % agar and 18 % bovine gels placed in the field of a 1.5-T MRI scanner. Motion-sensitized time-gated MRI images that were obtained and analyzed with custom-developed software used in previous studies revealed the production of movement in both agar and gel samples. Motion was most pronounced in the plane vertical to the sample and had the greatest amplitude when the current path was perpendicular to the scanner's magnetic field. These findings are compatible with the vector cross product nature of the Lorentz force and suggest that the imaging of Lorentz-force-induced motion in conductive samples is feasible. Whether this approach can be extended to study electrically active tissues such as the peripheral nerves, brain and heart remains to be seen. (c) 2005 Elsevier Inc. All rights reserved.
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