Radio-frequency antenna system based on mode hybridisation for a nuclear magnetic resonance device

Patent metadata

Field	Value
Publication number	US-10684332-B2
Application number	US-201415022393-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Sep 27, 2013
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

The invention relates to a radio-frequency antenna system including at least one radio-frequency transmitter and/or receiver and resonators which are mutually electro-magnetically hybridised, coupled with the radio-frequency transmitter and/or receiver, and electrically insulated from one another and from the radio-frequency transmitter and/or receiver.

First claim

The invention claimed is:

1. A radio-frequency antenna system comprising a least one radio-frequency transmitter and/or receiver connected to a transmission and/or reception control device adapted to cause said radio-frequency antenna system to transmit and/or receive radio-frequency waves at a radio frequency ω0 within ‘a given volume, and mutually hybridized resonators having a resonance frequency ω’ close to ω0, wherein said resonators are mutually hybridized electro-magnetically, are coupled to the radio-frequency transmitter and/or receiver, and are electrically insulated from one another and from the radio-frequency transmitter and/or receiver, wherein the electric resonators are parallel resonant rods arranged around the given volume and made of a non-magnetic material that is electrically conductive.

2. The system according to claim 1 , wherein the resonators are N in number and have N hybridized mode, the radio-frequency antenna system further comprising mode excitation for selectively exciting said hybridized modes.

3. The system according to claim 1 , wherein said mode excitation means are adapted to excite a plurality of hybridized mode simultaneously.

4. The system according to claim 1 , wherein the resonators comprise resonators that have at least one resonance primarily excited by the electric field.

5. The system according to claim 1 , wherein the distance between the resonators is between λ′/30; and λ′/3 where λ′ is the wavelength associated with the pulse ω′.

6. The system according to claim 1 , wherein the resonant rods are arranged at an equal distance from a central axis.

7. The system according to claim 1 , wherein the radio-frequency transmitter and/or receiver comprises a radio-frequency antenna chosen from among a non-adapted electric dipole and a loop.

8. The system according to claim 1 , wherein the radio-frequency transmitter and/or receiver comprises a plurality of radio-frequency antennas.

9. The system according to claim 1 , further comprising a solid dielectric element of high index placed at least partially between the resonators.

10. The system according to claim 1 , further comprising at least one device for moving the resonators relative to one another, the frequency of the hybridized modes being a function of the relative positions of said resonators.

11. The system according to claim 1 , wherein the resonant rods have an adjustable length, further comprising at least one internal device for adjusting the length of the rods, the resonance frequency of the resonant rods being a function of said length.

12. A nuclear magnetic resonance device comprising at least:
an electromagnet adapted to generate a permanent magnetic field,
a radio-frequency antenna system according to claim 1 , adapted to generate a radio-frequency magnetic field having at least one component transverse to the permanent magnetic field.

13. The device according to claim 12 , wherein the permanent magnetic field is greater than or equal to 3 T.

14. The device according to claim 12 , further comprising at least one non-resonant passive conductive member adapted to render the radio-frequency magnetic field more homogeneous.

15. The nuclear magnetic resonance device according to claim 12 , further comprising a coil system adapted to create magnetic field gradients in addition to the permanent magnetic field.

Assignees

• Centre National De La Rech Scientifique—Cnrs

Inventors

• Abdeddaim Mohamed Redha
• Jouvaud Camille
• Larrat Benoit
• Derosny Julien
• Tanter Mickael
• Fink Mathias

Classifications

• G01R33/3628

  Tuning/matching of the transmit/receive coil · CPC title

• G01R33/3642

  Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification · CPC title

• G01R33/3415

  comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels} · CPC title

• G01R33/34046 Primary

  Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils · CPC title

• G01R33/34092

  RF coils specially adapted for NMR spectrometers · CPC title