Development and testing of implanted carbon electrodes for electromagnetic field mapping during neuromodulation
| Autor: | Rosalind J. Sadleir, Neeta Ashok Kumar, Sri Kirthi Kandala, Munish Chauhan, Sung Min Sohn |
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| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
Materials science Deep Brain Stimulation Carbon fibers Magnetic Resonance Imaging Carbon Article Imaging phantom Electrodes Implanted 030218 nuclear medicine & medical imaging Magnetic field 03 medical and health sciences Full width at half maximum Electromagnetic Fields 0302 clinical medicine visual_art Electrode Spin echo visual_art.visual_art_medium Radiology Nuclear Medicine and imaging Electrodes Current density 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | Magn Reson Med |
| ISSN: | 1522-2594 0740-3194 |
| Popis: | Purpose Deep brain stimulation electrodes composed of carbon fibers were tested as a means of administering and imaging magnetic resonance electrical impedance tomography (MREIT) currents. Artifacts and heating properties of custom carbon-fiber deep brain stimulation (DBS) electrodes were compared with those produced with standard DBS electrodes. Methods Electrodes were constructed from multiple strands of 7-μm carbon-fiber stock. The insulated carbon electrodes were matched to DBS electrode diameter and contact areas. Images of DBS and carbon electrodes were collected with and without current flow and were compared in terms of artifact and thermal effects in phantoms or tissue samples in 7T imaging conditions. Effects on magnetic flux density and current density distributions were also assessed. Results Carbon electrodes produced magnitude artifacts with smaller FWHM values compared to the magnitude artifacts around DBS electrodes in spin echo and gradient echo imaging protocols. DBS electrodes appeared 269% larger than actual size in gradient echo images, in sharp contrast to the negligible artifact observed in diameter-matched carbon electrodes. As expected, larger temperature changes were observed near DBS electrodes during extended RF excitations compared with carbon electrodes in the same phantom. Magnitudes and distribution of magnetic flux density and current density reconstructions were comparable for carbon and DBS electrodes. Conclusion Carbon electrodes may offer a safer, MR-compatible method for administering neuromodulation currents. Use of carbon-fiber electrodes should allow imaging of structures close to electrodes, potentially allowing better targeting, electrode position revision, and the facilitation of functional imaging near electrodes during neuromodulation. |
| Databáze: | OpenAIRE |
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