Class / Patent application number | Description | Number of patent applications / Date published |
324319000 | Polarizing field magnet | 55 |
20080197850 | MAGNETIC RESONANCE APPARATUS HAVING A SUPERCONDUCTING BASIC FIELD MAGNET WITH A STRUCTURALLY REINFORCED CRYOSHIELD - In an arrangement of a basic field magnet and a gradient coil of a magnetic resonance apparatus, the basic field magnet includes superconducting coils that are arranged in a reservoir with liquid helium for cooling. The helium reservoir is surrounded by a further reservoir, designated as an outer vacuum chamber. A vacuum exists between the outer vacuum chamber and the helium reservoir. A cryoshield is arranged between the outer vacuum chamber and the helium reservoir. The gradient coil is arranged in the inner chamber of the basic field magnet. The cryoshield has additional structure for reinforcement that counteract vibrations of the cryoshield. | 08-21-2008 |
20080303522 | Magnetic Field Generator - There is provided a magnetic field generator | 12-11-2008 |
20080303523 | Magnetic Resonance Scanner With a Longitudinal Magnetic Field Gradient System - In a magnetic resonance scanner, a main magnet system ( | 12-11-2008 |
20090096453 | PASSIVE SHIMMING OF MAGNET SYSTEMS - In a method and an arrangement for shimming a cylindrical magnet system, that has a cylindrical magnet having a bore therein with an axis extending therethrough, and a gradient coil assembly located within the bore, shimming is accomplished by stacking a number of planar pieces of shim material in each of said tubes, with each of the tubes having an axis parallel to the axis of the cylindrical magnet, and with the planar pieces of shim material and stacked in the tubes in respective planes that are perpendicular to the axis fo the cylindrical magnet. | 04-16-2009 |
20090167304 | APPARATUS AND METHOD FOR VARYING MAGNETIC FIELD STRENGTH IN MAGNETIC RESONANCE MEASUREMENTS - Apparatus and method for varying field strength in a magnetic resonance system while keeping a relatively uniform magnetic field distribution. In an embodiment, a two-pole, generally u-shaped magnet assembly generates a static and uniform magnetic field. The magnet assembly includes two facing magnet poles separated by an air gap. Holes may be formed with the magnet poles. The field control rods may be placed at a pre-determined distance into these holes and symmetrically or asymmetrically moved across each magnet poles in a controlled manner to change the magnetic field strength while keeping the uniform magnetic field distribution. Maximum magnetic field strength may occur when the rods are removed. Minimum magnetic field strength may occur when the rods are fully inserted. | 07-02-2009 |
20090212775 | MR COMPATIBLE ROTATING ANODE X-RAY TUBE - An apparatus for use in a magnetic resonance (MR) system, which generates an external MR magnetic field, is provided. A rotor comprises a rotor shaft with an axis along a length of the rotor shaft and a plurality of coils on the rotor shaft. A housing supports and surrounds the rotor, where a part of the housing surrounds sides of the rotor and where the part of the housing surrounding sides of the rotor is magnet free. A mount allows for the mounting of the housing to the MR system in a location where the MR system provides a magnetic field, wherein a component of the MR magnetic field that is perpendicular to the axis of the rotor shaft is at least 100 Gauss. An active timer applies a voltage to the plurality of coils with alternating polarity. Contacts provide an electrical connection between the active timer and the plurality of coils. | 08-27-2009 |
20090237080 | MAGNETIC FIELD GENERATOR AND NUCLEAR MAGNETIC RESONANCE DEVICE PROVIDED WITH THE MAGNETIC FIELD GENERATOR - A magnetic field generator includes a magnetic circuit of an open magnetic path in which a uniform magnetic field can be generated with a simpler structure. A nuclear magnetic resonance device equipped with this magnetic filed generator is also provided. The magnetic field generator of an open magnetic path type includes: a first permanent magnet and a second permanent magnet which are arranged sequentially in a reference direction with a predetermined distance therebetween while directing the direction of magnetization in the reference direction, and a third permanent magnet and a fourth permanent magnet which are arranged sequentially between the first permanent magnet and the second permanent magnet along the reference direction while being in contact with each other or being spaced apart from each other with a predetermined distance therebetween. The direction of magnetization of the third permanent magnet has a first component parallel to the reference direction and a second component intersecting a first direction orthogonally and directed toward the region side. The direction of magnetization of the fourth permanent magnet has a first component and an inverted second component opposite to the direction of the second component and having a magnitude equal to a magnitude of the second component. | 09-24-2009 |
20100079144 | MAGNETS FOR USE IN MAGNETIC RESONANCE IMAGING - A magnetic resonance system uses a shielded superconducting magnet to produce a dsv useful for specialist imaging in an overall short magnet system at field strengths 1.5 Tesla and above. The magnet includes at least a first central coil C | 04-01-2010 |
20100231219 | MAGNET ARRANGEMENT FOR GENERATING AN NMR-COMPATIBLE HOMOGENEOUS PERMANENT MAGNETIC FIELD - A magnet arrangement for generating an NMR-compatible homogeneous permanent magnetic field is described. The invention has two permanent magnets, referred to hereafter as main magnets, which each have a magnet pole surface area. The magnet pole surface areas are situated parallel and at a distance to one another, so that the main magnets define an interspace on both sides through their magnet surface areas. The magnet pole surfaces of the main magnets each have a magnetic polarization opposite to one another. At least two annular permanent magnets are used, which are referred to hereafter as ring magnets, are situated coaxially to one another and jointly radially bound a ring inner chamber. The ring magnets are situated relative to the two main magnets in so that the ring inner chamber at least regionally encloses the interspace, and the magnetic fields of the main and ring magnets are constructively superimposed. | 09-16-2010 |
20110084695 | METHOD FOR MAKING A PERMANENT MAGNET PARTICULARLY FOR MRI SCANNERS AND A PERMANENT MAGNET, PARTICULARLY FOR MRI SCANNERS MADE BY SAID METHOD - Method for making magnets particularly for the use in MRI scanners, which magnets are three-dimensional and have a tubular wall made of magnetized material, with a closed or open annular shaped cross-section, the tubular wall being composed of individual elements made of magnetized material, the magnetization of each element made of magnetized material having a predetermined direction in the transverse section plane and said directions being determined such to generate a uniform static magnetic field in the cavity of the tubular wall. The invention provides the following steps:
| 04-14-2011 |
20110248715 | Compact Inhomogeneous Permanent Magnetic Field Generator for Magnetic Resonance Imaging - A magnet assembly primarily for use in MRI applications is disclosed. The magnet assembly is composed of a single disk and ring permanent magnet set connected to a C-type magnet yoke and return fixture with asymmetrically arranged poles. Together, the permanent magnets create a strong magnetic field that has a large static gradient in the central enclosure. The magnet assembly is primarily designed for diffusion based MRI scanning but can perform routine MRI scanning as well. | 10-13-2011 |
20130099787 | SYSTEM AND METHOD FOR SERIES RESONANT CONVERTER PROTECTION - A resonant power supply is disclosed. The resonant power supply includes a series resonant configured to convert an input DC voltage to an output DC voltage. The resonant power supply further comprises a converter controller coupled to the series resonant converter and configured to receive a DC voltage feedback signal measured at the output of the series resonant converter, or a resonant current feedback signal representing a resonant current flowing through the series resonant converter. The converter controller is further configured to generate control signals to be applied to the series resonant converter to limit the output DC voltage of the series resonant converter according to the DC voltage feedback signal and a predetermined voltage threshold signal, or to limit the resonant current of the series resonant converter according to the resonant current feedback signal and a predetermined current threshold signal. | 04-25-2013 |
20130106418 | HEAT CONDUCTING COMPONENT AND MANUFACTURING METHOD THEREFOR AND REFRIGERATION SYSTEM AND MAGNETIC RESONANCE IMAGING EQUIPMENT EMPLOYING SUCH A COMPONENT | 05-02-2013 |
20130162254 | MAGNETIC RESONANCE APPARATUS WITH A NOISE PREVENTION ELEMENT AND A MOLD APPARATUS FOR PRODUCING THE NOISE PREVENTION ELEMENT - A magnetic resonance apparatus includes a magnet unit and a housing unit enclosing the magnet unit. A noise prevention unit is provided which is arranged between the magnet unit and the housing unit enclosing the magnet unit and which has at least one noise prevention element made of an insulating foam. The at least one noise prevention element has a D-shaped cross-sectional area. | 06-27-2013 |
20130176028 | NMR Assessment System and Method - A system for NMR assessing a sample or a series of samples in turn which comprises means for applying a static magnetic field in a first direction through the sample, pre-polarising means for first applying a magnetic field in substantially the same direction to the sample, means for applying an alternating excitation magnetic field in a second different direction through the sample, means for sensing energy emitted by the sample in response to the excitation magnetic field, and means arranged to provide an indication of an assessment of the sample based on the energy emitted by the sample in response to the excitation magnetic field. | 07-11-2013 |
20130229182 | Gradient coil with correction windings and method for production thereof - In a coil arrangement for nuclear magnetic resonance comprising a main coil ( | 09-05-2013 |
20130234711 | MAGNETIC RESONANCE APPARATUS - A magnetic resonance apparatus is proposed. The magnetic resonance apparatus has a magnet unit and a housing unit surrounding the magnet unit. The housing unit has a first housing shell unit and a second housing shell unit. The second housing shell unit is arranged between the magnet unit and the first housing shell unit. | 09-12-2013 |
20130234712 | MAGNETIC RESONANCE APPARATUS - A magnetic resonance apparatus is proposed. The magnetic resonance apparatus has a magnet unit and a housing unit. The housing unit has a housing shell unit. The housing shell unit surrounds the magnet unit. The housing shell unit at least partly has a flexible material. Effective noise protection for operation of the magnetic resonance apparatus is provided. | 09-12-2013 |
20130265054 | CONDUIT-CONTAINING DEVICES AND METHODS FOR ANALYTE PROCESSING AND DETECTION - This invention features devices and methods for analyte processing and detection, and use of such methods, e.g., in the treatment and diagnosis of disease or determining the presence of a pathogen. | 10-10-2013 |
20130285664 | STATE SPACE FEEDBACK CONTROLLER IN THE DIGITAL DOMAIN FOR AN MRI GRADIENT COIL POWER SUPPLY - The invention relates to a state space feedback controller operating in the digital domain for the regulation of the current supply to MRI gradient coils from a multiple-bridge PWM power amplifier. The Pl-controller comprises an integration part (for the integration of the difference between the demand current and the measured gradient coil current) and a subsequent P-controlled system which in turn comprises a delay compensator/stabilizer and a plant. The delay compensator/stabilizer comprises a multi-path feedback loop by means of which its digital output signal is fed back through delay blocks, on the one hand, and through filter units, on the other hand, whereby the filter units model the transfer functions of a gradient coil output filter for the gradient coil voltage and the output current of the amplifier inverter units, respectively. In the plant, a filter unit, which models the gradient coil transfer function, is connected in series to a delay chain for the delay of the measurement value of the gradient coil current. | 10-31-2013 |
20140043027 | SLIP RING ASSEMBLY - A medical apparatus ( | 02-13-2014 |
20140062483 | MAGNETIC SHIELD FOR MR MAGNET - A magnetic shield for a field magnet of a magnetic resonance system is provided. A magnet apparatus with a field magnet for a magnetic resonance system with active shielding and a magnetic shield, wherein the magnetic shield forms a hollow body which accommodates the field magnets is also provided. A wall of the hollow body has a first, a second and a third area, which are disposed along the axis. In this case the second area separates the first area and the third area from one another and has a smaller wall thickness than the first and the third area. | 03-06-2014 |
20140070809 | MAGNETIC RESONANCE IMAGING APPARATUS AND A POWER CONTROL METHOD OF A MAGNETIC RESONANCE IMAGING APPARATUS - In one embodiment, an MRI apparatus ( | 03-13-2014 |
20140077812 | SYSTEM AND METHOD FOR MAINTAINING SOFT SWITCHING CONDITION IN A GRADIENT COIL DRIVER CIRCUIT - In one embodiment, a system includes a gradient coil driver configured to supply electrical signals to a gradient coil of a magnetic resonance imaging system. The gradient coil driver includes an electronic circuit. The electronic circuit includes a first H-bridge circuit electrically coupled to a power source. The first H-bridge includes a plurality of metal-oxide-semiconductor field-effect transistor (MOSFET) switches; and a plurality of diodes electrically coupled in parallel with each MOSFET switch. Each diode of the plurality of diodes is configured to conduct current to cause zero voltage potential across a source and a drain of one of the plurality of MOSFET switches. The first H-bridge also includes a load configured to regulate currents flowing through each of the plurality of diodes and each MOSFET switch of the plurality of MOSFET switches. | 03-20-2014 |
20140084927 | SURFACE-BASED NMR MEASUREMENT - Technologies applicable to surface-based NMR measurement are disclosed. A surface probe is positionable at or above a surface of the Earth and adapted to make NMR measurements of shallow or very shallow subsurface volumes. NMR spectrometer components connected to the surface probe are configured to control electromagnetic pulses produced by the surface probe and to record resulting detected NMR signals from the subsurface volume. | 03-27-2014 |
20140111206 | MRI ACOUSTIC SYSTEM, ACOUSTIC OUTPUT DEVICE, AND ELECTRO-ACOUSTIC TRANSDUCER - A magnetic resonance imaging (MRI) acoustic system includes a magnet; an electro-acoustic transducer that includes a coil through which a current flows so that an attractive force or a repulsive force is generated with respect to the magnet, and a vibrating plate that vibrates in response to the attractive force or the repulsive force; and a controller that controls an intensity of a current input to the electro-acoustic transducer according to a position of the electro-acoustic transducer in a magnetic field generated by the magnet. | 04-24-2014 |
20140125339 | PHASED ARRAY RF COIL FOR MAGNETIC RESONANCE IMAGING - A phased array radio-frequency (RF) coil includes a cylindrical frame including a coaxial inner frame and a coaxial outer frame having different diameters; and vertical loop coils arranged in a circumferential direction of the cylindrical frame. Each vertical loop coil includes an inner conductor extending in a lengthwise direction on the coaxial inner frame; an outer conductor extending in a lengthwise direction on the coaxial outer frame and facing the inner conductor; and a first resonant frequency adjustment capacitor for connecting one end of the inner conductor in the lengthwise direction and one end of the outer conductor in the lengthwise direction so that the phased array RF coil resonates at an MR operating frequency. | 05-08-2014 |
20140218033 | MAGNETIC RESONANCE IMAGING SYSTEM - A magnetic resonance imaging (MRI) system includes a main magnet configured to generate a static magnetic field, a gradient coil configured to generate a gradient magnetic field, and a radio frequency (RF) coil including a plurality of RF coils corresponding to volumes representing target regions of a subject. | 08-07-2014 |
20150338482 | MAGNETIC RESONANCE IMAGING DEVICE AND GRADIENT COIL - A magnetic resonance imaging device according to an embodiment includes a static magnetic field magnet that generates a static magnetic field, and a gradient coil in which a cooling pipe is laid. The cooling pipe is laid so as to preferentially cool a part near a uniform region in which uniformity of the static magnetic field is kept. | 11-26-2015 |
20150346299 | DISCHARGE CONTROLLED SUPERCONDUCTING MAGNET - A Cryogen-Free (CF) type MRI superconducting magnet system capable of monitoring the conditions of the system components and, in case of a foreseeable quench, discharging the superconducting magnet at any desired discharge voltage before occurrence of quench. | 12-03-2015 |
20150362570 | MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT COIL - A magnetic resonance imaging apparatus according to an embodiment includes a static field magnet, a gradient coil and a shim housing box. The static field magnet generates a static magnetic field in a space within a substantially cylindrical hollow. The gradient coil is provided inside the static field magnet and generates a gradient magnetic field. The shim housing box is capable of housing a metallic shim, the shim housing box being formed into a shape such that an attractive force of the static magnetic field applied to the shim housing box under magnetic excitation becomes smaller than a predetermined threshold. | 12-17-2015 |
20150377992 | Generation of Magnetic Fields for MRI with Loops Having Current Shunts - A conducting loop has thick cross section and is powered by a single voltage source capable of producing extremely high currents. Anti-parallel segments of the loop are brought in close proximity to each other and the unpaired segments in this loop are shaped to collectively form a homogenous B | 12-31-2015 |
324320000 | With homogeneity control | 23 |
20080204025 | Tool and Method for Shimming a Magnet - The invention provides tools and methods for shimming magnets such as MRI and NMR magnets, while at field. The invention provides safe methods for shimming at field. The invention particularly provides a tool ( | 08-28-2008 |
20080211504 | MAGNETIC RESONANCE IMAGING APPARATUS - [PROBLEMS] A magnetic resonance imaging apparatus in which vibration of a gradient magnetic field coil is reduced, the vibration is not transmitted to a static magnetic field correcting unit, and the space can be saved. | 09-04-2008 |
20080224702 | FIELD DISTRIBUTION CORRECTION ELEMENT AND METHOD FOR GENERATING A MAGNETIC RESONANCE EXPOSURE THEREWITH - A field distribution correction element for positioning on an examination subject in a magnetic resonance system for local influencing of the radio-frequency field distribution during a magnetic resonance acquisition has a system of electrically conductive dipole strips essentially running in parallel, arranged on a carrier element. In a corresponding method for generation of magnetic resonance exposures of an examination subject in a magnetic resonance system, for local influencing of the radio-frequency field distribution, such a field distribution correction element is positioned on the patient. | 09-18-2008 |
20080258729 | Shim for Imaging Magnets - An arrangement for producing an imaging region of increased maximum radial diameter in a magnetic resonance imaging (MRI) system, comprising a solenoidal magnet arrangement ( | 10-23-2008 |
20080290871 | Magnetic field adjustment device and magnetic field adjustment method for superconducting magnet - A magnetic field adjustment device for a superconducting magnet, wherein magnetic material shim mechanisms are arranged in an axial direction of an inside periphery of the cylindrical superconducting magnet, each of the magnetic material shim mechanisms including a combined shim tray ( | 11-27-2008 |
20080309343 | Magnetic Resonance Imaging Apparatus - A magnetic resonance imaging apparatus capable of suppressing noise caused by vibration of a gradient magnetic field coil and improving image quality is realized. | 12-18-2008 |
20090009171 | Shim support guide JIG for magnetic field generation apparatus, magnetic field generation apparatus and magnetic resonance imaging equipment each including shim support in which magnetic material shims are arranged and adjusted by employing shim support guide JIG, and magnetic field adjustment method for magnetic field generation apparatus, as well as magnetic field adjustment method for magnetic resonance imaging equipment - A shim support guide jig includes a shim support guide pipe in which a guide passage for guiding the movement of a shim support is formed. In a state where a superconducting magnet has generated a static magnetic field, the designated shim support can be drawn out from the internal space of the superconducting magnet through the guide passage, and the designated shim support for which magnetic material shims have been arranged and adjusted can be inserted into the internal space through the guide passage. A magnetic field generation apparatus has the magnetic material shims arranged and adjusted using the shim support guide jig, and a magnetic resonance imaging equipment employs the magnetic field generation apparatus. Magnetic field adjustment methods for the magnetic field generation apparatus and for the magnetic resonance imaging equipment are performed using the shim support guide jig. | 01-08-2009 |
20090096454 | Methods For Rectification of B0 Inhomogeneity effects in Magnetic Resonance Images - A method for reducing B0 inhomogeneous effects in magnetic resonance imaging (MRI). The method includes: obtaining a high-resolution volumetric MR image of the patient, such high-resolution volumetric MR image having B0 inhomogeneous effects; calculating distortion within obtained the high-resolution volumetric MR image of the patient; and correcting the B0 inhomogeneous effects in the obtained high-resolution volumetric image using the calculated distortion. | 04-16-2009 |
20090206839 | SYSTEM, METHOD AND APPARATUS FOR COMPENSATING FOR DRIFT IN A MAIN MAGNETIC FIELD IN AN MRI SYSTEM - A method for compensating for drift in a main magnetic field of a superconducting magnet in a magnetic resonance imaging (MRI) system includes measuring a pressure in a cryostat of the superconducting magnet. Based on the pressure, a parameter of an element of the MRI system is adjusted to correct or compensate for a change in the main magnetic field. | 08-20-2009 |
20090267607 | ARRANGEMENT TO ADJUST THE HOMOGENEITY OF A BASIC MAGNETIC FIELD - An arrangement for the adjustment of the homogeneity of a basic magnetic field in a magnetic resonance apparatus includes gradient coil support fashioned to support a gradient coil system. The gradient coil support has at least one channel that is fashioned to accommodate an associated shim tray. The shim tray is designed to accommodate ferromagnetic shim elements at predetermined positions in order to adjust the homogeneity of the basic magnetic field of the magnetic resonance apparatus. The shim tray has a first locking element coupled with it. The channel has a second locking element, and the first and second locking element are shaped such that both are positively connected with one another by a force produced by the basic magnetic field of the magnetic resonance apparatus upon activation thereof. | 10-29-2009 |
20100102819 | Sense Shimming (SSH): a fast approach for determining B0 field inhomogeneities using sensitivity encoding - The pursuit for ever higher field strengths and faster data acquisitions has led to the construction of coil arrays with high numbers of elements. With the SENSE technique it has been shown, how the sensitivity of those elements can be used for spatial image encoding. A method in accordance with the present invention, largely abstains from using encoding gradients. The resulting sensitivity encoded free induction decay (FID) data is then not used for imaging, but for determining field inhomogeneity distribution. The method has therefore been termed SSH for Sense SHimming. | 04-29-2010 |
20100213940 | MAGNETIC FIELD GRADIENT GENERATING SYSTEM AND METHOD FOR REDUCING THE NOISE LEVEL IN NMR/MRI EXPERIMENTS - A magnetic field gradient generating system for a NMR system, includes at least one set of gradient coils, preferably arranged according to three axes of a spatial referential system, and a controlled power supplying unit for the gradient coils, the power supplying unit including, for each gradient coil, a converter/amplifier module, the modules being fed with pulse sequences of digital gradient data provided as word streams by an adapted gradient data generator according to a pulse program, each arrangement of a gradient coil and a converter/amplifier module forming a gradient channel. The power supplying unit also includes an automatic blanking system which scans the gradient data words sent to the [converter/amplifier] modules and, according to sensed values, selectively delivers blanking signals to be applied to the modules in order to disable the power stages of their respective amplifiers connected to the gradient coils, when no current is to be fed to the coils. | 08-26-2010 |
20110050229 | METHOD AND APPARATUS FOR COMPENSATING INSUFFICIENT HOMOGENEITY OF THE BASIC MAGNETIC FIELD IN A MAGNETIC RESONANCE APPARATUS - In a method and device for compensating the insufficient homogeneity of a magnetic field in a magnetic resonance system, the spatial position and size of a basic magnetic field region and at least one additional magnetic field region in a field to be homogenized and determined. An optimization calculation is implemented on the basic magnetic field region and the at least one additional magnetic field region. A homogenized magnetic field at the main magnetic field region and the at least one additional magnetic field region is output according to the result of the optimization calculation. | 03-03-2011 |
20110163750 | METHOD AND APPARATUS FOR CORRECTING THE UNIFORMITY OF A MAGNETIC FIELD - In a method and apparatus for correcting the uniformity of a magnetic field, an active shim shell is placed in the magnetic field, a magnetic resonance image of the active shim shell obtained, and the placement position of the active shim shell is determined by analyzing the magnetic resonance image. The value of a shim current in the active shim shell is determined so as to meet the uniformity requirements of the magnetic field according to the placement position. The value of the shim current in said active shim shell is set to the determined value of the shim current. | 07-07-2011 |
20120256631 | APPARATUS AND METHOD FOR DETERMINING THE HOMOGENEITY OF A FLUID FLOW - An apparatus for determining the homogeneity of a fluid flow in a pipe, such as a reducing-agent flow in an exhaust-gas pipe of an internal combustion engine, including a transmitter arranged on a light-transmissive region of the pipe and a diametrically opposite detector. The transmitter and detector being coupled such that they are rotatable through an angle of 360° about a rotational axis which is located substantially in the axis of symmetry of the pipe. The transmitter and the detector are rotated through at least 360° about the rotational axis, thus capturing an intensity of the detected light over the rotation angle, and from this a homogeneity of the fluid flow is deduced. | 10-11-2012 |
20130009643 | NMR ANALYZER FOR CLINICAL EXAMINATIONS - A compact NMR analyzer for clinical examinations which is suitable for use at medical facilities is provided. An NMR analyzer for clinical examinations | 01-10-2013 |
20130134978 | Balancing Out a Field Inhomogeneity in a Magnetic Resonance Tomography System and Shim Coil Arrangement - In order to balance out a field inhomogeneity, a value for a coil current is determined by a controller as a function of an item of information relating to the field inhomogeneity and an item of information relating to a position of at least one balancing or shim coil arranged in the magnetic field. The value is to be supplied to the at least one shim coil in order to generate a magnetic balancing field to balance out the field inhomogeneity. A control signal for at least one shim current source and for at least one switching matrix coupling the at least one shim current source to the at least one shim coil is generated as a function of the at least one value. | 05-30-2013 |
20130193973 | Permanent Magnet Device for Generating an Offset Uniform Magnetic Field - Disclosed is a device for generating a homogeneous magnetic field component Bz along an axis Oz in a spherical zone of interest of centre O and radius r includes at least one first ring of axis Oz in magnetic material with radial magnetization oriented in a first direction and extending around an opening giving access to the zone of interest ZI, a second ring of axis Oz in magnetic material with radial magnetization oriented in the first direction and offset along axis Oz from the first ring and the zone of interest ZI, the inner radius and the outer radius of the second ring respectively being smaller than the inner radius and outer radius of the first ring. | 08-01-2013 |
20130271142 | LOW FIELD SQUID MRI DEVICES, COMPONENTS AND METHODS - Low field SQUID MRI devices, components and methods are disclosed. They include a portable low field (SQUID)-based MRI instrument and a portable low field SQUID-based MRI system to be operated under a bed where a subject is adapted to be located. Also disclosed is a method of distributing wires on an image encoding coil system adapted to be used with an NMR or MRI device for analyzing a sample or subject and a second order superconducting gradiometer adapted to be used with a low field SQUID-based MRI device as a sensing component for an MRI signal related to a subject or sample. | 10-17-2013 |
20130328564 | NMR RF PROBE COIL EXHIBITING DOUBLE RESONANCE - The present invention describes NMR probe coils that are designed to operate at two different frequencies, producing a strong and homogenous magnetic field at both the frequencies. This single coil, placed close to the sample, provides a method to optimize the NMR detection sensitivity of two different channels. In addition, the present invention describes a coil that generates a magnetic field that is parallel to the substrate of the coil as opposed to perpendicular as seen in the prior art. The present invention isolates coils from each other even when placed in close proximity to each other. A method to reduce the presence of electric field within the sample region is also considered. Further, the invention describes a method to adjust the radio-frequency tuning and coupling of the NMR probe coils. | 12-12-2013 |
20140043028 | METHOD AND APPARATUS FOR SHIMMING A SUPERCONDUCTING MAGNET - In a method and apparatus for shimming a superconducting magnet that has a number of magnet coils electrically connected in series between a first current connection and a second current connection and a superconducting switch connected in parallel with the magnet coils, between the first current connection and the second current connection, with the first current connection being electrically connected to an external current lead, a first solid-state switching device is electrically interposed between the external current lead and the magnet coils; a number of superconducting shim coils electrically connected between the first current connection and the second current connection through a further solid-state switching device. Superconducting switches are each connected in parallel with a respective superconducting shim coil. | 02-13-2014 |
20150070018 | HOMOGENIZATION DEVICE FOR HOMOGENIZATION OF A MAGNETIC FIELD - A homogenization device for homogenization of a magnetic field with an non-magnetic carrier and compensation elements formed of a magnetic material, the carrier having a carrier wall and the carrier wall surrounding a carrier interior, in the homogenization device located in the magnetic field the magnetic field penetrating into the carrier interior through a first carrier region of the carrier wall and emerging from the carrier interior through a second carrier region of the carrier wall and each of the compensation elements which are located on the carrier contributing to the homogenization of the magnetic field at least in the carrier interior. In the homogenization device, handling during homogenization is improved in that there are recesses in the carrier wall and in each of the recesses at least one of the compensation elements can be directly inserted and removed. | 03-12-2015 |
20160069972 | FERROMAGNETIC AUGMENTATION FOR MAGNETIC RESONANCE IMAGING - In some aspects, a magnetic system for use in a low-field MRI system. The magnetic system comprises at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B | 03-10-2016 |