Disclosed are a magnet-insert assembly adapted for insertion into and removal from a central cavity of a magnetic-field generating magnet array, and a magnet array adapted to receive the magnet-insert assembly. The magnet insert assembly comprising a substructure defining a shaft therein; one or more headstones; and one or more permanent magnets. The substructure being adapted to receive, secure and position the one or more headstones and the one or more permanent magnets in the central cavity of the magnet array.
H01F 41/00 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques
Described are a pole piece assembly for use in a Halbach-type magnet configuration, a magnetic resonance device comprising the pole piece assembly, and a method for shimming a magnetic field using the pole piece assembly. The pole piece comprising a rear face, a front face S, and ends separated by a first distance defining a length of said pole piece assembly along a first axis extending between said ends, said pole piece assembly being configured for insertion into an interior of the Halbach-type magnet configuration along said first axis, wherein a surface of the front face S is curved, and wherein a curvature of the front face is mathematically defined for shimming the magnetic field generated by the magnet configuration.
A pole piece for use in a Halbach-type magnet configuration, the pole piece having an elongated body adapted for insertion into the Halbach-type magnet configuration and having at least two parts operably and removably connected to each other. The at least two parts of the pole piece comprise a top iron having a front face and a rear face, a bottom iron having a front face and a rear face, and an interstitial shim layer adapted to be inserted in a shim cavity defined by a depression formed in at least one of: the front face of the top iron and the rear face of the bottom iron. A method for shimming includes modifying a material content of the shim cavity and inserting the pole piece into the central cavity of the Halbach-type magnet configuration for shimming the magnetic field generated.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
G01R 33/3873 - Compensation des inhomogénéités utilisant des corps ferromagnétiques
H01F 3/10 - Dispositions composites de circuits magnétiques
A magnet array is disclosed comprising a plurality of polyhedral magnets arranged in a Halbach cylinder configuration, the centers of individual ones of the plurality of polyhedral magnets being arranged substantially in a plane in a magnet rack, the plurality of the polyhedral magnets at least partly enclosing a testing volume, and comprising a first plurality of polyhedral magnets arranged in a Halbach cylinder configuration and a second plurality of polyhedral magnets arranged in a non-Halbach configuration. In another aspect, a magnet array is disclosed comprising a first subset and a second subset of polyhedral magnets having different coercivities. In yet another aspect, a magnet array is disclosed wherein a subset of the centers of the individual ones of the plurality of polyhedral magnets are laterally displaced from a nominal position in the magnet rack to counteract a magnetic field gradient of the magnet array.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
H01F 41/02 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques pour la fabrication de noyaux, bobines ou aimants
6.
Methods and systems for acquiring magnetic resonance data from a sample
The present document describes methods and systems for exciting magnetic resonance in a sample using trains of pulsed, oscillating magnetic fields that are modulated in their phase and amplitude according to a source waveform derived from the known or estimated magnetic response of a sample. Also disclosed are methods and systems for acquiring a response signal from the sample wherein data acquisition events are synchronized or interleaved with said modulated pulse trains. Further disclosed are methods and systems for identifying one or more of the presence, absence, amount, and concentration of a target substance in a sample. Also disclosed is a magnetic resonance device which uses such pulse trains and synchronized acquisition to improve the selectivity of magnetic resonance data.
G01N 24/08 - Recherche ou analyse des matériaux par l'utilisation de la résonance magnétique nucléaire, de la résonance paramagnétique électronique ou d'autres effets de spin en utilisant la résonance magnétique nucléaire
Disclosed is a magnet rack comprising a central cavity and a rack framework surrounding the central cavity, the rack framework defining a plurality of lattice sites for receiving a plurality of magnets wherein centers of the magnets occupying said lattice sites are arranged in a hexagonal Bravais lattice configuration; wherein the lattice sites in the rack framework define a plurality of concentric rings around the central cavity; and wherein the shape of the central cavity is defined by the lattice sites of at least the innermost ring and the second innermost ring.
H01F 7/20 - Électro-aimantsActionneurs comportant des électro-aimants sans armature
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
A magnet array is disclosed comprising a plurality of polyhedral magnets arranged in a Halbach cylinder configuration, the centers of individual ones of the plurality of polyhedral magnets being arranged substantially in a plane in a magnet rack, the plurality of the polyhedral magnets at least partly enclosing a testing volume, and comprising a first plurality of polyhedral magnets arranged in a Halbach cylinder configuration and a second plurality of polyhedral magnets arranged in a non-Halbach configuration. In another aspect, a magnet array is disclosed comprising a first subset and a second subset of polyhedral magnets having different coercivities. In yet another aspect, a magnet array is disclosed wherein a subset of the centers of the individual ones of the plurality of polyhedral magnets are laterally displaced from a nominal position in the magnet rack to counteract a magnetic field gradient of the magnet array.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
H01F 41/02 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques pour la fabrication de noyaux, bobines ou aimants
Disclosed is a pole piece for use in a Halbach-type magnet configuration, the pole piece having an elongated body adapted for insertion into the Halbach-type magnet configuration and comprising at least two parts operably and removably connected to each other. The at least two parts of the pole piece comprise a top iron having a front face and a rear face, a bottom iron having a front face and a rear face, and an interstitial shim layer adapted to be inserted in a shim cavity defined by a depression formed in at least one of: the front face of the top iron and the rear face of the bottom iron. A method for shimming is also disclosed which includes modifying a material content of the shim cavity and inserting the pole piece into the central cavity of the Halbach-type magnet configuration for shimming the magnetic field generated.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
11.
METHODS AND SYSTEMS FOR ACQUIRING MAGNETIC RESONANCE DATA FROM A SAMPLE
The present document describes methods and systems for exciting magnetic resonance in a sample using trains of pulsed, oscillating magnetic fields that are modulated in their phase and amplitude according to a source waveform derived from the known or estimated magnetic response of a sample. Also disclosed are methods and systems for acquiring a response signal from the sample wherein data acquisition events are synchronized or interleaved with said modulated pulse trains. Further disclosed are methods and systems for identifying one or more of the presence, absence, amount, and concentration of a target substance in a sample. Also disclosed is a magnetic resonance device which uses such pulse trains and synchronized acquisition to improve the selectivity of magnetic resonance data.
G01N 24/08 - Recherche ou analyse des matériaux par l'utilisation de la résonance magnétique nucléaire, de la résonance paramagnétique électronique ou d'autres effets de spin en utilisant la résonance magnétique nucléaire
G01R 33/44 - Dispositions ou appareils pour la mesure des grandeurs magnétiques faisant intervenir la résonance magnétique utilisant la résonance magnétique nucléaire [RMN]
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Analytical instruments, namely nuclear magnetic resonance
(nmr) spectrometers and magnetic resonance imaging (mri)
consoles. Scientific services, namely design, development and
manufacturing of analytical instruments in the nature of
nuclear magnetic resonance (nmr) spectrometers and magnetic
resonance imaging (mri) consoles.
A magnet array is disclosed comprising a plurality of polyhedral magnets arranged in a Halbach cylinder configuration, the centers of individual ones of the plurality of polyhedral magnets being arranged substantially in a plane in a magnet rack, the plurality of the polyhedral magnets at least partly enclosing a testing volume, and comprising a first plurality of polyhedral magnets arranged in a Halbach cylinder configuration and a second plurality of polyhedral magnets arranged in a non-Halbach configuration. In another aspect, a magnet array is disclosed comprising a first subset and a second subset of polyhedral magnets having different coercivities. In yet another aspect, a magnet array is disclosed wherein a subset of the centers of the individual ones of the plurality of polyhedral magnets are laterally displaced from a nominal position in the magnet rack to counteract a magnetic field gradient of the magnet array.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
G01R 33/12 - Mesure de propriétés magnétiques des articles ou échantillons de solides ou de fluides
09 - Appareils et instruments scientifiques et électriques
Produits et services
Analytical instruments, namely, nuclear magnetic resonance (NMR) spectrometers and magnetic resonance imaging (MRI) consoles, not being medical devices
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
Analytical instruments, namely, nuclear magnetic resonance (NMR) spectrometers and magnetic resonance imaging (MRI) consoles, not being medical devices Scientific services, namely, design and development of analytical instruments in the nature of nuclear magnetic resonance (NMR) spectrometers and magnetic resonance imaging (MRI) consoles
09 - Appareils et instruments scientifiques et électriques
42 - Services scientifiques, technologiques et industriels, recherche et conception
Produits et services
(1) Analytical instruments, namely Nuclear Magnetic Resonance (NMR) spectrometers and Magnetic Resonance Imaging (MRI) apparatus for laboratories and industrial applications. (1) Scientific services, namely design and development of analytical instruments in the nature of Nuclear Magnetic Resonance (NMR) spectrometers and Magnetic Resonance Imaging (MRI) apparatus for laboratories and industrial applications
09 - Appareils et instruments scientifiques et électriques
Produits et services
(1) Analytical instruments, namely Nuclear Magnetic Resonance (NMR) spectrometers and Magnetic Resonance Imaging (MRI) apparatus for laboratories and industrial applications.
21.
Lattice configurations of polyhedral component magnets
There are disclosed magnet arrays and methods for generating magnetic fields. In embodiments magnet arrays comprise a plurality of polyhedral magnets arranged in a lattice configuration and at least partly enclosing a testing volume, the magnet array having an associated magnetic field with a designated field direction {circumflex over (v)}, wherein the magnetization direction {circumflex over (m)} of an individual polyhedral magnet located at a displacement vector {right arrow over (r)} from an origin point in the testing volume is determined by the formula: {circumflex over (m)}=(2({circumflex over (v)}·{right arrow over (r)}){right arrow over (r)}−({right arrow over (r)}·{right arrow over (r)}){circumflex over (v)})/{right arrow over (r)}·{right arrow over (r)}. In embodiments the arrays are comprised in magnetic resonance machines. In embodiments the polyhedral magnets are truncated cubes or are rhombic dodecahedra.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
G01R 33/28 - Détails des appareils prévus dans les groupes
G01R 33/3873 - Compensation des inhomogénéités utilisant des corps ferromagnétiques
There are disclosed magnet arrays and methods for generating magnetic fields. In embodiments magnet arrays comprise a plurality of polyhedral magnets arranged in a lattice configuration and at least partly enclosing a testing volume, the magnet array having an associated magnetic field with a designated field direction, formula (I), wherein the magnetization direction, formule (II) of an individual polyhedral magnet located at a displacement vector, formule(III) from an origin point in the testing volume is determined by the, formula (IV). In embodiments the arrays are comprised in magnetic resonance machines. In embodiments the polyhedral magnets are truncated cubes or are rhombic dodecahedra.
There are disclosed pole piece designs. In embodiments a pole piece comprises a rear face, the rear face comprising at least one channel. In embodiments the pole piece comprises at least one hole for accepting a cooperating shimming rod. There are also disclosed magnet arrays and magnetic resonance apparatuses comprising the pole pieces as well as uses of the pole pieces with magnet arrays according to embodiments.
G01V 3/00 - Prospection ou détection électrique ou magnétiqueMesure des caractéristiques du champ magnétique de la terre, p. ex. de la déclinaison ou de la déviation
G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
G01R 33/3873 - Compensation des inhomogénéités utilisant des corps ferromagnétiques
There are disclosed pole piece designs. In embodiments a pole piece comprises a rear face, the rear face comprising at least one channel. In embodiments the pole piece comprises at least one hole for accepting a cooperating shimming rod. There are also disclosed magnet arrays and magnetic resonance apparatuses comprising the pole pieces as well as uses of the pole pieces with magnet arrays according to embodiments.
G01R 33/383 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des aimants permanents
25.
METHOD AND APPARATUS FOR PRODUCING HOMOGENEOUS MAGNETIC FIELDS
A method for shimming a magnetic field is disclosed. The method uses a single shim current to contribute to suppression of more than one geometrical component of an inhomogeneity in the magnetic field without changing the geometry of the shim path. Apparatuses to implement the method are also disclosed. In embodiments the apparatuses comprise substantially commonly oriented shim paths.
A method for shimming a magnetic field is disclosed. The method uses a single shim current to contribute to suppression of more than one geometrical component of an inhomogeneity in the magnetic field without changing the geometry of the shim path. Apparatuses to implement the method are also disclosed. In embodiments the apparatuses comprise substantially commonly oriented shim paths.
