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7609139 |
Split Florida-helix magnet
An electromagnet having at least one access port oriented perpendicularly to the electromagnet's central axis. The magnet has a conventional helical winding along its central axis. However, at some...
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7595713 |
Magnetic field generator for MRI and method of covering magnetic field generator for MRI
A magnetic field generator for MRI comprises a generator main body and a covering member for covering the whole generator main body, and the covering member is made of a non-magnetic material, for...
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7567158 |
Superconducting magnet arrangement with hysteresis free field coil
A magnet arrangement (M, M′, M″, M′″) for generating a magnetic field in the direction of a z-axis in a working volume (V) disposed on the z-axis about z=0, with a magnet coil system (A,...
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7557577 |
Water-soluble paramagnetic substance reducing the relaxation time of the coolant in an MRI system
The invention relates to the use of a water-soluble paramagnetic substance, in particular a magnetic resonance contrast medium, to reduce the magnetic resonance relaxation time of a coolant for...
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7541904 |
Magnetic field adjusting device
The present invention relates to a magnetic field adjusting device; such as may be used in MRI apparatus. The device can overcome the magnetic force to enable shimming plugs to move in a controlled...
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7540240 |
Protection device for military or civilian vehicles against magnetic detection mines
A protection device for land vehicles against mines, wherein it incorporates a metallic plate positioned under the vehicle so as to normalize the magnetic field generated by the vehicle and/or by...
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7500366 |
Refrigerator with magnetic shield
A magnetic shield is mounted in its own vacuum enclosure in a regenerative type expander comprising a vacuum enclosure, magnetic material in a cold regenerator, and a magnetic shield, where the...
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7484691 |
Method and device for magnetic space radiation shield providing isotropic protection
There is provided a radiation shield device for providing radiation protection to an area, such as a manned vehicle. The radiation shield device comprises a magnetic field generator, such as a...
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7432791 |
Magnet arrangement for carrying, guiding and/or braking systems in magnetic levitation vehicles
A magnet arrangement ( 1 ) for magnetic levitation vehicles is described that is comprised of an electromagnet having a plurality of magnet poles, said magnet poles having cores connected via pole...
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7427908 |
Magnetic shimming configuration with optimized turn geometry and electrical circuitry
A magnetic shimming configuration for a high-field magnet having optimized turn geometry and electrical circuitry. The present invention accomplishes this by combining the corrective...
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7355499 |
Magnet assembly
A magnet assembly comprising first and second sets of coils ( 1, 2 ) for generating respective magnetic fields, wherein the coils are constructed and arranged such that under working conditions, a...
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7323963 |
MRI superconductive magnet
An object of the present invention is to provide a MRI superconductive magnet enables sharp images representing patients' health states to be produced. [Means for Achieving the Object] A MRI...
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7256672 |
Magnetic field generating device and method of shimming thereof
A magnetic field generating device is disclosed having an arrangement of permanent magnets, each permanent magnet (PM) having a north end and a south end, and each aligned in the same north-south...
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7248047 |
Shielding for mobile MR systems
A trailer for housing a mobile MRI system has magnetic shielding in the form of a plurality of sheets of magnetic material which are supported within the trailer, by a rigid supporting structure or...
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7193494 |
Shim pieces for a magnetic resonance imaging magnet
A method for producing a shim piece for a magnetic resonance imaging (MRI) magnet. The shim piece is used to form a shim of a magnet and is designed to suppress eddy currents in the shim created by...
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7170291 |
Additional fringe field shield for a superconducting magnet coil system
An actively shielded superconducting magnet coil system ( 1 ) for generating a magnetic field in a working volume ( 6 ), which is rotationally symmetric about a z-axis, comprising a radially inner...
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7167067 |
Permanent magnet-type magnetic field generating device
To reduce the skew angle components in a dipole ring magnetic field generating device, a magnetic field generating device 1 is provided in which comprises: a plurality of magnet elements 101 to...
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7167004 |
Open MRI magnet assembly with paired planar driving coils having opposite current flows and a racetrack, nested, or substantially-planar multi-coil shape
The present invention provides a magnet assembly ( 30 a , 30 b ) comprising a pair of drive coils ( 31 a , 31 b ; 32 a , 32 b ; 33 a , 33 b ) symmetrically disposed with respect to a reference...
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7135948 |
Dipole shim coil for external field adjustment of a shielded superconducting magnet
An actively shielded superconducting magnet having a dipole shim coil for adjusting and fine-tuning an external or far fringe magnetic field produced by a main coil of the magnet. An active shield...
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7126448 |
Superconducting magnet apparatus and magnetic resonance imaging apparatus using the same
An MRI apparatus includes magnet members for compensating the magnetic field which are disposed to a thermal shield system of the superconducting apparatus. The magnet members for compensating the...
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7071694 |
Magnet assembly of an MRI system with concentric annular ferromagnetic laminations
The present invention is a saturated ferromagnetic structure for controlling the homogeneity of the primary magnet field of a magnet in a Magnetic Resonance Imaging system. The structure has a...
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7049920 |
Open magnet device and magnetic resonance imaging apparatus comprising it
In a superconductive magnet device comprising upper and lower vacuum vessels coupled by a coupling conduit, the upper and lower vacuum vessels 9 and the coupling conduit 24 coupling them are...
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7005953 |
Magnet system with shielded regenerator material
A magnet system with a magnet arrangement (M), a working volume (V) and a pulse tube cooler (P) with magnetic regenerator material (r) is characterized in that a shielding (m) of magnetic material...
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6998949 |
Magnetic resonance imaging (MRI) system comprising acoustic resonators
The invention relates to a magnetic resonance imaging (MRI) system ( 1 ) comprising an examination volume ( 11 ), a main magnet system ( 17 ) for generating a magnetic field (B 0 ) in the...
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6995641 |
Hyperpolarized gas containers, solenoids, transport and storage devices and associated transport and storage methods
A compact portable transport unit for shipping hyperpolarized noble gases and shielding same from electromagnetic interference and/or external magnetic fields includes a means for shifting the...
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6987436 |
Method for fringe field compensation of an actively shielded superconducting NMR magnet
The invention concerns a method for charging an actively shielded magnet coil arrangement ( 20 ) comprising a first partial region ( 21 ) which can be superconductingly short-circuited using an...
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6977571 |
Secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit
A secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit is disclosed herein. The secondary coil circuit includes two circuit nodes, a ramping switch...
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6972654 |
Armored magnetic base
An armored magnetic base of the present invention includes a magnet enclosed within a protective sleeve. The magnet may have an optional shielding casing substantially covering one face of the...
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6946940 |
Permanent magnet and shim design
A general method for the design of structures composed of permanent magnetic material for producing and modifying magnetic fields. The method employs a finite set of permissible spatial harmonic...
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6946939 |
Packaging plate for magnetic circuit, method for packaging magnetic circuit using the same, and magnetic circuit package
It is an object to provide a package for a magnetic circuit, with which a leakage magnetic field escaping from an aperture of a magnetic circuit is reduced and the magnetic attraction acting on the...
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6933820 |
Magnetic circuit with opposing permanent magnets and method for adjusting magnetic field thereof
It is an object of the present invention to facilitate adjustment of magnetic fields. There is provided a magnetic circuit with opposing permanent magnets, comprising: a pair of permanent magnets...
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6916005 |
Displacement sensor and solenoid valve driver
A displacement sensor includes a ferromagnetic member for forming a magnetic path, a coil for generating a magnetic field in the magnetic path when fed with a high-frequency current, and a...
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6909348 |
Low-leakage magnetic-field magnet and shield coil assembly
A magnet device provided with a shield current carrying means in which two sets of magneto-static field generating sources for generating magnetic fields directed towards a first direction are...
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6897751 |
Pole-piece unit, method for assembling the same, and magnetic field generator
A magnetic field generator comprises a pair of pole-piece units. The pair of pole-piece units respectively include plate yokes. Each of the plate yokes includes a surface facing the other's and...
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6897750 |
Integral passive shim system for a magnetic resonance apparatus
In an arrangement for adjusting the spatial dependence of a magnetic field in a working volume of a main field magnet ( 19 ) by means of ferromagnetic field shaping elements ( 16 ), the field...
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6889070 |
Magnetic resonance imaging apparatus and assembly process thereof
Magnetic resonance imaging apparatus having a pair of a first magnet device and a second magnet device for generating a magnetostatic field, the pair of magnet devices being installed opposite each...
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6861933 |
Superconductive magnet device
A superconductive magnet device comprises a pair of oppositely disposed superconductive bodies in which annular superconductive coils are accommodated, and fine chip-shaped ferromagnetic shims...
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6856223 |
Open-type magnet device for MRI
An open-type magnet device for MRI includes a pair of upper and lower magnet assemblies, and shims are provided on opposite sides of their cooling containers and/or in holes passing through central...
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6853281 |
Magnet apparatus and mri apparatus
A magnet device includes two sets of static magnetic field generation sources spaced from each other in the vertical direction such that the uniform magnetic field region (patient space) is between...
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6844801 |
Methods and apparatus for adjusting center magnetic field of a magnetic field generator for MRI
A product line of MRI systems includes a first MRI system including a first yoke and a plurality of magnet blocks forming a first central assembly disposed on the first yoke. The product line also...
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6816047 |
Magnetic resonance imaging apparatus
The present invention relates to techniques for enlarging an opening, which accommodates a subject, in a superconducting magnet apparatus for use in MRI system, so as to prevent the subject from...
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6816046 |
Superconducting electromagnet apparatus
A superconducting electromagnet apparatus comprises a main coil assembly ( 1 ) and a main current supply ( 5 ) energising and de-energising the main coil assembly ( 1 ), and for persisting the...
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6809619 |
System and method for adjusting magnetic center field for permanent MRI magnetic field generator
The present invention relates to a method and system for adjusting a magnetic center field of a magnetic field generator in an MRI. One embodiment of the presenting invention relates to a magnetic...
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6781495 |
Magnetic field generator and assembling method thereof
A magnetic field generator comprises a pair of plate yokes opposed to each other with a space in between. Each plate yoke has a main surface on which a permanent magnet is disposed. A shielding...
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6781494 |
Actively shielded superconducting magnet assembly with a device for additional fringe field optimization
A magnet assembly for generating a magnetic field (H) in the direction of a z axis in a working volume (AV) comprises an actively shielded superconducting magnet coil system (M) and at least one...
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6781492 |
Superconducting magnetic apparatus
A superconducting magnet apparatus. By forming one or more holes in each of platelike ferromagnetic substances forming a magnetic shield for focusing the magnetic flux generated by superconducting...
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6778054 |
Methods and apparatus for passive shimming of magnets
A method for shimming a magnetic field of a magnet in a volume of interest, utilizing ferromagnetic pellets for shimming. The pellets are positioned in a nonmagnetic holder having a predetermined...
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6741151 |
Moving coil linear actuator
A moving coil linear actuator has a bobbin or coil wound as close packed turns of rectangular—cross section wire and radially polarized circumferentially continuous ring magnets which are...
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6714109 |
Method of shimming a magnetic field
A process for adjusting an homogeneity of a magnetic field produced by a magnet having a pole includes placing a spherically-shaped magnetic shim element within the magnetic field so as to become...
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6707362 |
Method and apparatus for focusing a magnetic field to treat liquids
A magnetic device having an optimized geometry provides maximum beneficial physical effects of applying a magnetic field to a fluid. The device includes three relatively powerful magnets located...
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