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Magnetic resonance with conducting and high-dielectric samples

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1002/9780470034590.emrstm1182
AuteurRechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut du biodiagnostic du CNRC
FormatTexte, Chapitre de livre
Sujethigh field; conducting sample; high-dielectric sample; penetration effects; wavelength effects; S/N; SAR; field focusing; dielectric resonance
Résumé
The goal of the article is to provide insight into the way magnetic and electric fields of the magnetic resonance experiment behave both in vacuo and inside a sample that is conductive and/or dielectric. Effects such as image asymmetry and central brightness, which appear unphysical without the necessary insights, are explained as is the spatial distribution of absorbed power. Using a saline sphere as a model sample, fields are analyzed in Bessel spherical harmonics reminiscent of the functions used in the theory of magnet shimming, and the principle of reciprocity is then employed to predict the signal-to-noise ratio and its frequency dependence. The mathematics is of moderate difficulty but is built from basic principles to aid comprehension.
Date de publication
Dans
  • Encyclopedia of Magnetic Resonance (15 septembre 2011).
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC19689661
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Identificateur de l’enregistrementa822c79d-ba81-4cc9-a2f8-155ffd9fd6bb
Enregistrement créé2012-03-22
Enregistrement modifié2020-03-03
Date de modification :