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1. WO2014128399 - METHOD AND DEVICE FOR MAGNETIC FIELD CORRECTION FOR AN NMR MACHINE

Publication Number WO/2014/128399
Publication Date 28.08.2014
International Application No. PCT/FR2014/050335
International Filing Date 18.02.2014
IPC
G01R 33/385 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
385using gradient magnetic field coils
G01R 33/3875 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
387Compensation of inhomogeneities
3875using correction coil assemblies, e.g. active shimming
G01R 33/565 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques
565Correction of image distortions, e.g. due to magnetic field inhomogeneities
G01R 33/30 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
30Sample handling arrangements, e.g. sample cells, spinning mechanisms
CPC
G01R 33/307
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
30Sample handling arrangements, e.g. sample cells, spinning mechanisms
307specially adapted for moving the sample relative to the MR system, e.g. spinning mechanisms, flow cells or means for positioning the sample inside a spectrometer
G01R 33/3875
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
387Compensation of inhomogeneities
3875using correction coil assemblies, e.g. active shimming
Applicants
  • COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES [FR]/[FR]
Inventors
  • SAKELLARIOU, Dimitri
  • HUGON, Cedric
  • AUBERT, Guy
Agents
  • THEVENET, Jean-Bruno
Priority Data
135139619.02.2013FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) METHOD AND DEVICE FOR MAGNETIC FIELD CORRECTION FOR AN NMR MACHINE
(FR) PROCEDE ET DISPOSITIF DE CORRECTION DE CHAMP MAGNETIQUE POUR UNE MACHINE DE RMN
Abstract
(EN)
The device for magnetic field correction of an NMR system comprising a device for creating a homogeneous magnetic field in a direction Oz, in an area of interest ZI, a device for supporting a sample (117), with orientation of a main dimension of the sample (117) at an angle θ0 different from zero relative to direction Oz, gradient coils (114) and radiofrequency coils (115), comprises a set of correction coils (116) positioned around the device for supporting the sample (117). Each correction coil (116) has an axis coinciding with direction Oz and comprises winding elements made from the iso-contours of a flux function F spaced evenly between terminals of flux function F on a cylinder, the shape of the iso-contours being determined from a spherical harmonic development in an inclined coordinate system Ox'y'z' attached to the sample (117) with a main axis Oz' corresponding to the main dimension of the sample (117) oriented at an angle θ0 different from zero relative to direction Oz of the homogeneous magnetic field, each correction coil (116) corresponding to a term of the spherical harmonic development.
(FR)
Le dispositif de correction de champ magnétique d'un système de RMN comprenant un dispositif de création d'un champ magnétique homogène selon une direction Oz, dans une zone d'intérêt ZI, un dispositif de support d'un échantillon (117), avec une orientation d'une dimension principale de l'échantillon (117) selon un angle θ0 différent de zéro par rapport à la direction Oz, des bobines de gradient (114) et des bobines radiofréquence (115), comprend un ensemble de bobines (116) de correction positionnées autour du dispositif de support de l'échantillon (117). Chaque bobine (116) de correction présente un axe confondu avec la direction Oz et comprend des éléments de bobinage réalisés à partir des iso-contours d'une fonction flux F espacés de manière régulière entre des bornes de la fonction flux F sur un cylindre, la forme des iso-contours étant déterminée à partir d'un développement en harmoniques sphériques dans un système de coordonnées incliné Ox'y'z' attaché à l'échantillon (117) avec un axe principal Oz' correspondant à la dimension principale de l'échantillon (117) orientée selon un angle θ0 différent de zéro par rapport à la direction Oz du champ magnétique homogène, chaque bobine (116) de correction correspondant à un terme du développement en harmoniques sphériques.
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