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Development and testing of implanted carbon electrodes for electromagnetic field mapping during neuromodulation.

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Title: Development and testing of implanted carbon electrodes for electromagnetic field mapping during neuromodulation.
Authors: Ashok Kumar, Neeta1 (AUTHOR), Chauhan, Munish1 (AUTHOR), Kandala, Sri Kirthi1 (AUTHOR), Sohn, Sung‐Min1 (AUTHOR), Sadleir, Rosalind J.1 (AUTHOR) Rosalind.Sadleir@asu.edu
Source: Magnetic Resonance in Medicine. Oct2020, Vol. 84 Issue 4, p2103-2116. 14p.
Subjects: Carbon electrodes, Electromagnetic fields, Electrical impedance tomography, Deep brain stimulation, Magnetic flux density
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Development and testing of implanted carbon electrodes for electromagnetic field mapping during neuromodulation.
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  Data: <searchLink fieldCode="AR" term="%22Ashok+Kumar%2C+Neeta%22">Ashok Kumar, Neeta</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chauhan%2C+Munish%22">Chauhan, Munish</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kandala%2C+Sri+Kirthi%22">Kandala, Sri Kirthi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sohn%2C+Sung‐Min%22">Sohn, Sung‐Min</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sadleir%2C+Rosalind+J%2E%22">Sadleir, Rosalind J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Rosalind.Sadleir@asu.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Oct2020, Vol. 84 Issue 4, p2103-2116. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+electrodes%22">Carbon electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+fields%22">Electromagnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Electrical+impedance+tomography%22">Electrical impedance tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Deep+brain+stimulation%22">Deep brain stimulation</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+flux+density%22">Magnetic flux density</searchLink>
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  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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            NameFull: Ashok Kumar, Neeta
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              Text: Oct2020
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