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  Modeling radiofrequency responses of realistic multi-electrode leads containing helical and straight wires

Kozlov, M., Horner, M., & Kainz, W. (2019). Modeling radiofrequency responses of realistic multi-electrode leads containing helical and straight wires. Magnetic Resonance Materials in Physics, Biology and Medicine. doi:10.1007/s10334-019-00793-9.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-EF28-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-3B37-C
Genre: Journal Article

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Kozlov_Horner_2019.pdf (Publisher version), 4MB
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 Creators:
Kozlov, Mikhail1, Author              
Horner, Marc2, Author
Kainz, Woflgang2, Author
Affiliations:
1Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2205649              
2External Organizations, ou_persistent22              

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Free keywords: Computational modeling; RF simulations; Tissue heating; Implanted medical device; Finite element method (FEM)
 Abstract: Purpose To present a modeling workflow for the evaluation of a lead electromagnetic model (LEM) consisting of a transfer function (TF) and a calibration factor. The LEM represents an analytical relationship between the RF response of a lead and the incident electromagnetic field. The study also highlights the importance of including key geometric details of the lead and the electrode when modeling multi-electrode leads. Methods The electrical and thermal responses of multi-electrode leads with helical and straight wires were investigated using 3D electromagnetic (EM) and thermal co-simulations. The net dissipated power (P) around each lead electrode and the net temperature increase at the electrodes (ΔT) were obtained for a set of incident EM fields with different spatial distributions. A reciprocity approach was used to determine a TF for each electrode based on the results of the computational model. The evaluation of the calibration factors and the TF validation were performed using the linear regression of P versus the LEM predictions. Results P and ΔT were investigated for four multi-electrode leads and four single-electrode leads containing either helical or straight wires. All electrodes of the multi-electrode lead were found to be points of high power deposition and temperature rise. The LEMs for the individual electrodes varied substantially. A significant dependence of the calibration factors on the surrounding tissue medium was also found. Finally, the model showed that the TF, the calibration factor, P and ΔT for multi-electrode leads differ significantly from those for single-electrode leads. Conclusion These results highlight the need to evaluate a LEM for each electrode of a multi-electrode lead as well as for each possible surrounding medium. It is also shown that the results derived from simulations based on simplified single-electrode leads can significantly mislead multi-electrode lead analyses.

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Language(s): eng - English
 Dates: 2019-09-272019-05-182019-10-242019-11-19
 Publication Status: Published online
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s10334-019-00793-9
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Title: Magnetic Resonance Materials in Physics, Biology and Medicine
Source Genre: Journal
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Publ. Info: Amsterdam : No longer published by Elsevier
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 0968-5243
CoNE: https://pure.mpg.de/cone/journals/resource/954926245532