• Passer à la navigation principale
  • Passer au contenu principal
  • Passer à la barre latérale principale
  • Passer au pied de page
  • TW
  • YT
  • FAQ
  • Contact

M-Cube

MetaMaterials antenna for ultra-high field Mri

MetaMaterials antenna
for ultra-high field Mri
  • The Project
  • Partners
  • Publications
    • Scientific Articles
    • Open Data
    • HAL
  • Press release
  • Events
  • Jobs
  • Videos
Accueil › Scientific publications › Constructive Near-Field Interference Effect in a Birdcage MRI Coil with an Artificial Magnetic Shield

Constructive Near-Field Interference Effect in a Birdcage MRI Coil with an Artificial Magnetic Shield

juin 5, 2020

K. Lezhennikova, R. Abdeddaim, A. Hurshkainen, A. Vignaud, M. Dubois, P. Jomin, D. Berrahou, A. Raaijmakers, N. Avdievich, I. Melchakova, S. Enoch, P. Belov, C. Simovski, and S. Glybovski, “Constructive Near-Field Interference Effect in a Birdcage MRI Coil with an Artificial Magnetic Shield”, Phys. Rev. Applied 13, 064004 (2020) – Published 2 June 2020

 https://doi.org/10.1103/PhysRevApplied.13.064004

Abstract

Radio-frequency (rf) coils are used in all clinical and research magnetic-resonance-imaging (MRI) systems to excite nuclear spins and to receive signals from them. The quality of imaging depends strongly on the signal-to-noise ratio (SNR) and the transmit efficiency of the coils. The birdcage volume coils used in most MRI scanners for homogeneous imaging of a sample are typically shielded from the external systems of the MRI scanner, i.e., the gradient coils, to confine the rf field within the region of interest. However, the near magnetic field of a conventional copper rf shield surrounding a birdcage coil interferes destructively with the primary field of the coil in the sample, which significantly limits the SNR and the transmit efficiency. In the work presented here, we theoretically study and experimentally demonstrate the possibility of creating an artificial magnetic rf shield for a birdcage coil with constructive interference in a sample. This effect is similar to the in-phase reflection of antenna far fields from a magnetic shield but affects the near field in MRI. We build an analytical model of a birdcage coil shielded with a cylindrical impedance boundary and analyze the conditions for increasing the efficiency of the coil by means of the shield. We conclude that by replacing a copper shield with an artificial magnetic one, it is possible to reduce the dissipative intrinsic losses of the coil and increase the power absorbed by the sample, which improves the efficiency. To demonstrate the effect, we perform a detailed numerical simulation and an experiment with a small birdcage in a 7-T 19F MRI system with a magnetic shield implemented as a periodic cylindrical metal structure with corrugations filled with a ceramic.

Keywords : Magnetism, Medical Physics, Metamaterials

Partners : ITMO, Aix Marseille University, CNRS, CEA Neurospin, UMCUtrecht, Aalto university, Multiwave

juin 5, 2020

Barre latérale principale

Twitter

Tweets by MCUBE19

Last video

H2020 FET Project M-Cube Final review - Metamaterials Antenna for Ultra-High Field MRI
  • « prec.
  • 1
  • 2
  • 3
  • suiv. »
H2020 FET Project M-Cube Final review - Metamaterials Antenna for Ultra-High Field MRI
Titre
H2020 FET Project M-Cube Final review - Metamaterials Antenna for Ultra-High Field MRI
Runtime
3:11
Date de publication
Jul 30, 2021
Description
A look back at the four years of the M-CUBE project (2017-2021). The videos and ...
European Project M-CUBE
Titre
European Project M-CUBE
Runtime
4:06
Date de publication
Mar 9, 2021
Description
Le projet de recherche M-CUBE est un FET-Open financé par la Commission Europé...
Interview Denis Tihon Ph.D.
Titre
Interview Denis Tihon Ph.D.
Runtime
1:08
Date de publication
Mar 5, 2021
Description
Presentation of Denis TIHON, PhD, Teaching assistant in Université Catholique d...
M-CUBE project - with DANISH subtitles -  MetaMaterials antenna for ultra-high field MRI
Titre
M-CUBE project - with DANISH subtitles - MetaMaterials antenna for ultra-high field MRI
Runtime
2:00
Date de publication
Sep 26, 2019
Description
M-Cube project, entitled “MetaMaterials antenna for ultra-high field MRI” is...
Proyecto M-CUBE - Antena de MetaMaterial para la IRM (English with SPANISH subtitles)
Titre
Proyecto M-CUBE - Antena de MetaMaterial para la IRM (English with SPANISH subtitles)
Runtime
2:00
Date de publication
Sep 26, 2019
Description
Este video de 2 min es accesible a todo publico y es destinado a la difusión ci...
M-CUBE project - with FINNISH subtitles -  MetaMaterials antenna for ultra-high field MRI
Titre
M-CUBE project - with FINNISH subtitles - MetaMaterials antenna for ultra-high field MRI
Runtime
2:00
Date de publication
Sep 26, 2019
Description
M-Cube project, entitled “MetaMaterials antenna for ultra-high field MRI” is...
Проект MCube  - Антенны на основе метаматериалов для сверхвысокопольной МРТ. (Russian subtitles)
Titre
Проект MCube - Антенны на основе метаматериалов для сверхвысокопольной МРТ. (Russian subtitles)
Runtime
2:00
Date de publication
Sep 26, 2019
Description
Проект MCube, под названием "Антенны на основе ...
M-CUBE project - with ENGLISH subtitles - MetaMaterials antenna for ultra-high field MRI
Titre
M-CUBE project - with ENGLISH subtitles - MetaMaterials antenna for ultra-high field MRI
Runtime
2:00
Date de publication
Sep 26, 2019
Description
M-Cube project, entitled “MetaMaterials antenna for ultra-high field MRI” is...
M-CUBE Project - with DUTCH subtitles - MetaMaterials antenna for ultra-high field MRI
Titre
M-CUBE Project - with DUTCH subtitles - MetaMaterials antenna for ultra-high field MRI
Runtime
2:00
Date de publication
Sep 26, 2019
Description
M-Cube project, entitled “MetaMaterials antenna for ultra-high field MRI” is...
M-CUBE sous-titrée en FRANÇAIS - Méta-matériaux pour les antennes IRM haut-champ et ultra-haut champ
Titre
M-CUBE sous-titrée en FRANÇAIS - Méta-matériaux pour les antennes IRM haut-champ et ultra-haut champ
Runtime
2:00
Date de publication
Sep 26, 2019
Description
Le projet M-Cube pour “MetaMaterials antenna for ultra-high field MRI” est l...

Footer

  • Contact
  • FAQ
  • Legal Notice
  • Credits
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 736937