An artificial dielectric slab for ultra high-field MRI: Proof of concept.
inhomogeneity
7 T
Artificial dielectric
Dielectric pad
Metamaterial
Radiofrequency coil
Ultra high-field MRI
Journal
Journal of magnetic resonance (San Diego, Calif. : 1997)
ISSN: 1096-0856
Titre abrégé: J Magn Reson
Pays: United States
ID NLM: 9707935
Informations de publication
Date de publication:
11 2020
11 2020
Historique:
received:
19
03
2020
revised:
02
09
2020
accepted:
21
09
2020
pubmed:
17
10
2020
medline:
17
10
2020
entrez:
16
10
2020
Statut:
ppublish
Résumé
High-permittivity dielectric pads, i.e., thin, flexible slabs, usually consisting of mixed ceramic powders and liquids, have been previously shown to increase the magnetic field at high and ultra high-fields in regions of low efficiency of transmit coils, thus improving the homogeneity of images. However, their material parameters can change with time, and some materials they contain are bio incompatible. This article presents an alternative approach replacing ceramic mixtures with a low-cost and stable artificial dielectric slab. The latter comprises a stack of capacitive grids realized using multiple printed-circuit boards. Results in this article show that the proposed artificial dielectric structure can obtain the same increase in the local transmit radiofrequency magnetic field distribution in a head phantom at 7 T as the conventional dielectric pad.
Identifiants
pubmed: 33065392
pii: S1090-7807(20)30153-1
doi: 10.1016/j.jmr.2020.106835
pii:
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
106835Informations de copyright
Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of Competing Interest None.