Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications

Journal article

Giovannetti, G. and Tiberi, G. (2016). Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications. Applied Magnetic Resonance. 47, pp. 601-612. https://doi.org/10.1007/s00723-016-0780-x
AuthorsGiovannetti, G. and Tiberi, G.
Abstract

The design and development of dedicated radiofrequency (RF) coils is a fundamental task to maximize the signal-to-noise ratio (SNR) in nuclear magnetic resonance (NMR) applications. Coil resistance reduces the SNR and should be minimized by employing conductors of appropriate shape and cross section. At RF, the conductor resistance is increased due to the skin effect, which distributes the current primarily on the surface of the conductor instead of uniformly over the cross section. In particular, in rectangular shape conductors the current density is concentrated in the high-curvature area and increases the conductor resistance, while rounded conductors present lower resistance and demonstrate improvements in performance especially in low-frequency tuned coils. This paper summarizes the different methods for estimating conductor losses in RF coils for NMR applications, whose performance strongly affect quality data. Because the impact to coil loss from conductors with different cross-sectional area is not something generally recognized and nor addressed in many other coil design works, we believe the review could be interesting for researchers working in the field of NMR coil design and development.

Year2016
JournalApplied Magnetic Resonance
Journal citation47, pp. 601-612
PublisherSpringer
ISSN1613-7507
Digital Object Identifier (DOI)https://doi.org/10.1007/s00723-016-0780-x
Web address (URL)http://www.scopus.com/inward/record.url?eid=2-s2.0-84964534065&partnerID=MN8TOARS
Publication dates
Online28 Apr 2016
Publication process dates
Accepted10 Apr 2016
Deposited20 Sep 2022
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Open
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Finite element method-based approach for radiofrequency magnetic resonance coil losses estimation
Giovannetti, G., Tiberi, G. and Tosetti, M. (2016). Finite element method-based approach for radiofrequency magnetic resonance coil losses estimation. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. 46B (4), pp. 186-190. https://doi.org/10.1002/cmr.b.21348
Huygens Principle based UWB Microwave Imaging Method for Skin Cancer Detection
Ghavami, N, Tiberi, G, Ghavami, M, Dudley, S and Lane, ME (2016). Huygens Principle based UWB Microwave Imaging Method for Skin Cancer Detection. 10th IEEE/IET International Symposium on Communication Systems, Networks and Digital Signal Processing. Prague, Czech Republic 20 - 22 Jul 2016 Institute of Electrical and Electronics Engineers (IEEE).
Quadrature birdcage coil with distributed capacitors for 7.0 T magnetic resonance data acquisition of small animals
Stara, R., Tiberi, G., Gabrieli, M., Buonincontri, G., Fontana, N., Monorchio, A., Costagli, M., Symms, M.R., Retico, A. and Tosetti, M. (2015). Quadrature birdcage coil with distributed capacitors for 7.0 T magnetic resonance data acquisition of small animals. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. https://doi.org/10.1002/cmr.b.21271
Evaluation of 3D radio-frequency electromagnetic fields for any matching and coupling conditions by the use of basis functions
Tiberi, G., Fontana, N., Monorchio, A., Stara, R., Retico, A. and Tosetti, M. (2015). Evaluation of 3D radio-frequency electromagnetic fields for any matching and coupling conditions by the use of basis functions. Journal of Magnetic Resonance. 261, pp. 38-42. https://doi.org/10.1016/j.jmr.2015.09.015
Non-iterative beamforming based on Huygens principle for multistatic ultrawide band radar: Application to breast imaging
Ghavami, N., Smith, P.P., Tiberi, G., Edwards, D. and Craddock, I. (2015). Non-iterative beamforming based on Huygens principle for multistatic ultrawide band radar: Application to breast imaging. IET Microwaves, Antennas and Propagation. 9 (12), pp. 1233-1240. https://doi.org/10.1049/iet-map.2014.0621
Non-invasive assessment of Neuromuscular Disorders by 7 tesla Magnetic Resonance Imaging and Spectroscopy: Dedicated radio-frequency coil development
Retico, A., Stara, R., Fantacci, M.E., Toncelli, A., Galante, A., Florio, T.M., Alecci, M., Cosottini, M., Astrea, G., Battini, R., Tiberi, G., Costagli, M. and Tosetti, M. (2015). Non-invasive assessment of Neuromuscular Disorders by 7 tesla Magnetic Resonance Imaging and Spectroscopy: Dedicated radio-frequency coil development. 2015 IEEE International Symposium on Medical Measurements and Applications, MeMeA 2015. Torino, Italy 07 - 09 May 2015 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/memea.2015.7145174
Assessment of Silent T1-weighted head imaging at 7 T
Costagli, M., Symms, M.R., Angeli, L., Kelley, D.A.C., Biagi, L., Farnetani, A., Rua, C., Donatelli, G., Tiberi, G., Tosetti, M. and Cosottini, M. (2015). Assessment of Silent T1-weighted head imaging at 7 T. European Radiology. 26, pp. 1879-1888. https://doi.org/10.1007/s00330-015-3954-2
Design of Interference-Resilient Medium Access for High Throughput WLANs
Reggiani, L., Gola, A., Maggio, G.M. and Tiberi, G. (2015). Design of Interference-Resilient Medium Access for High Throughput WLANs. International Journal of Distributed Sensor Networks. https://doi.org/10.1155/2015/659569
Local SAR in adults and children at 7T MR: Realistic estimation by the using of simulations
Fontana, N., Tiberi, G., Stara, R., Monorchio, A., Retico, A. and Tosetti, M. (2014). Local SAR in adults and children at 7T MR: Realistic estimation by the using of simulations. 2014 International Conference on Electromagnetics in Advanced Applications (ICEAA). 03 - 08 Aug 2014 https://doi.org/10.1109/iceaa.2014.6903858
Tissue Border Enhancement by inversion recovery MRI at 7.0 Tesla.
Costagli M, Kelley DA, Symms MR, Biagi L, Stara R, Maggioni E, Tiberi G, Barba C, Guerrini R, Cosottini M and Tosetti M (2014). Tissue Border Enhancement by inversion recovery MRI at 7.0 Tesla. Neuroradiology. 56, pp. 517-523. https://doi.org/10.1007/s00234-014-1365-8
Short-term side-effects of brain MR examination at 7 T: a single-centre experience.
Cosottini M, Frosini D, Biagi L, Pesaresi I, Costagli M, Tiberi G, Symms M and Tosetti M (2014). Short-term side-effects of brain MR examination at 7 T: a single-centre experience. European Radiology. https://doi.org/10.1007/s00330-014-3177-y
STEAM-MiTiS: An MR spectroscopy method for the detection of scalar-coupled metabolites and its application to glutamate at 7 T
Toncelli, A., Noeske, R., Cosottini, M., Costagli, M., Domenici, V., Tiberi, G. and Tosetti, M. (2014). STEAM-MiTiS: An MR spectroscopy method for the detection of scalar-coupled metabolites and its application to glutamate at 7 T. Magnetic Resonance in Medicine. 74 (6), pp. 1515-1522. https://doi.org/10.1002/mrm.25556
Huygens principle based imaging of multilayered objects with inclusions
Ghavami, N., Tiberi, G., Edwards, D.J., Safaai-Jazi, A. and Monorchio, A. (2014). Huygens principle based imaging of multilayered objects with inclusions. Progress In Electromagnetics Research B. 58, pp. 139-149. https://doi.org/10.2528/pierb13121002