Estimation of losses in strip and circular wire conductors of radiofrequency planar surface coil by using the finite element method

Journal article


Giovannetti, G., Fontana, N., Monorchio, A., Tosetti, M. and Tiberi, G. (2017). Estimation of losses in strip and circular wire conductors of radiofrequency planar surface coil by using the finite element method. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. https://doi.org/10.1002/cmr.b.21358
AuthorsGiovannetti, G., Fontana, N., Monorchio, A., Tosetti, M. and Tiberi, G.
Abstract

An accurate coil design is a fundamental task to maximize signal-to-noise ratio in magnetic resonance applications. Coil design techniques take advantage of com- puter simulations especially when coil size is comparable to the radiofrequency (RF) wavelength. In particular, the estimation of the losses within the conductors as well as the radiative losses, both as a function of frequency, is instrumental to a complete coil performance characterization. However, the cross-sectional shape of the conductors strongly affects the radiofrequency coil’s performance, especially at those frequencies where conductor losses represent the dominant power dissipation mechanism. Indeed, at radiofrequencies, the current flowing in the conductor is distributed in the proximity of its surface instead of being uniformly distributed over the cross section; it follows that an accurate conductor losses estimation can be performed only in the case of wire conductors by using analytical formulations. For strip conductors, although different theoretical approaches have been proposed in literature by taking into account the losses, no closed-form expression for conductors resistance is available which takes into account both classical and lateral skin effects. In this work, finite element method (FEM) simulations have been performed for estimating conductor and radiative losses in pla- nar surface loops made of strips and circular wires; the results have been compared against analytical formulations and literature data. Workbench tests per- formed on two circular coil prototypes, the first one constituted by a strip and the second one by circular wire conductors, tuned at 63.9 MHz and 127.8 MHz, showed a good agreement with FEM simulations.

Year2017
JournalConcepts in Magnetic Resonance Part B: Magnetic Resonance Engineering
PublisherWiley
ISSN2017
Digital Object Identifier (DOI)https://doi.org/10.1002/cmr.b.21358
Web address (URL)http://www.scopus.com/inward/record.url?eid=2-s2.0-85034590861&partnerID=MN8TOARS
Publication dates
Online30 Oct 2017
Publication process dates
Accepted20 Nov 2017
Deposited29 Sep 2022
Accepted author manuscript
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Open
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This is the peer reviewed version of the following article: Estimation of losses in strip and circular wire conductors of radiofrequency planar surface coil by using the finite element method, which has been published in final form at https://doi.org/10.1002/cmr.b.21358. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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