Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications

Giulio Giovannetti, Gianluigi Tiberi

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalApplied Magnetic Resonance
DOIs
Publication statusAccepted/In press - Apr 28 2016

Fingerprint

coils
conductors
nuclear magnetic resonance
signal to noise ratios
cross sections
low resistance
estimating
curvature
current density
low frequencies

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications. / Giovannetti, Giulio; Tiberi, Gianluigi.

In: Applied Magnetic Resonance, 28.04.2016, p. 1-12.

Research output: Contribution to journalArticle

@article{5c6e76bf39bb46cb9ed926b213642e3d,
title = "Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications",
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.",
author = "Giulio Giovannetti and Gianluigi Tiberi",
year = "2016",
month = "4",
day = "28",
doi = "10.1007/s00723-016-0780-x",
language = "English",
pages = "1--12",
journal = "Applied Magnetic Resonance",
issn = "0937-9347",
publisher = "Springer Wien",

}

TY - JOUR

T1 - Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications

AU - Giovannetti, Giulio

AU - Tiberi, Gianluigi

PY - 2016/4/28

Y1 - 2016/4/28

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84964534065&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84964534065&partnerID=8YFLogxK

U2 - 10.1007/s00723-016-0780-x

DO - 10.1007/s00723-016-0780-x

M3 - Article

AN - SCOPUS:84964534065

SP - 1

EP - 12

JO - Applied Magnetic Resonance

JF - Applied Magnetic Resonance

SN - 0937-9347

ER -