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  Effect of multiple scattering on heating induced by radio frequency energy

Kozlov, M., Angelone, L. M., & Rajan, S. (2020). Effect of multiple scattering on heating induced by radio frequency energy. IEEE Transactions on Electromagnetic Compatibility, 62(5), 2311-2316. doi:10.1109/TEMC.2019.2950170.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-EF1E-F Version Permalink: http://hdl.handle.net/21.11116/0000-0007-5013-9
Genre: Journal Article

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 Creators:
Kozlov, Mikhail1, Author              
Angelone, Leonardo M. 2, Author
Rajan, Sunder2, 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, gel phantom, heating, implanted medical device, radio frequency (RF) safety
 Abstract: Heating induced by radio frequency (RF) energy may be generated in tissues near active or passive devices implanted in a patient undergoing magnetic resonance imaging (MRI) examination. Recent normative documents for the assessment of RF energy-induced heating state that the net temperature increase (ΔT) depends on the physical characteristics of the surrounding tissues and on the squared incident tangential electric field (Etan(l)). The documents do not address the possible effect of multiple scattering from surrounding reflective interfaces, such as, for example, a plastic enclosure of the container (“phantom”) used for implant testing. In our study, we investigated the effect of multiple scattering on ΔT/Etan(l)2 in relation to the implant location when tested in a phantom filled with a gel. The test implant was a titanium alloy rod of 100 mm in length, used as a reference implant in standard documents. The applied RF was in the 128 MHz band, corresponding to the RF generated in a 3 T MRI system. Both the numerical model and measurement provided substantial evidence that ΔT/Etan(l)2 depends on the distance between the rod and phantom box enclosure. In the numerical model, up to 38% variation of this quantity was observed, suggesting that location of the implant with respect to the phantom enclosure would need to be included as a parameter when evaluating RF-induced heating of implants.

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Language(s): eng - English
 Dates: 20192019-11-192020-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1109/TEMC.2019.2950170
 Degree: -

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Title: IEEE Transactions on Electromagnetic Compatibility
Source Genre: Journal
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Publ. Info: New York : IEEE
Pages: - Volume / Issue: 62 (5) Sequence Number: - Start / End Page: 2311 - 2316 Identifier: ISSN: 0018-9375
CoNE: https://pure.mpg.de/cone/journals/resource/0018-9375