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| Number | Title | Issue Date |
| 7370789 | Variable field-of-view gradient coil system for magnetic resonance imaging The present invention relates to a gradient coil system for magnetic resonance imaging (MRI) systems and to a magnetic resonance imaging (MRI) system comprising such a gradient coil system. Magnetic resonance imaging systems comprise at least a main magnet system, a... | 05/13/2008 |
| 7368913 | Apparatus and method of providing forced airflow to a surface of a gradient coil An apparatus for providing forced airflow to a surface of a cylindrical gradient coil in a cylindrical magnet assembly including a cylindrical magnet and a first annular gap between the gradient coil and the magnet, the gradient coil mounted inside the magnet includ... | 05/06/2008 |
| 7348777 | Thermal shield to coldhead sleeve thermal contact A magnetic resonance imaging magnet assembly is provided. The assembly comprises a outer thermal shield having an operational temperature. The assembly further includes a cold sleeve assembly comprising a plurality of braid elements mounted to a cooler block and a h... | 03/25/2008 |
| 7305845 | System and method for de-icing recondensor for liquid cooled zero-boil-off MR magnet A system and method for de-icing a recondensor includes at least one heating element configured to melt iced particles from a recondensing system. A power delivery circuit is included configured to deliver power to the at least one resistive heating element such tha... | 12/11/2007 |
| 7295010 | Low temperature probe having transmitting coil and receiving coil or transmit/receive coil and used in NMR apparatus In an ultrahigh sensitive NMR apparatus, a stability of a temperature of a very low temperature probe coil is improved. A low temperature probe of the high sensitive NMR apparatus is structured at a very low temperature by a cooling apparatus. A cooling medium at a ... | 11/13/2007 |
| 7287387 | Cooling apparatus Cooling apparatus comprises a vacuum chamber, an inner chamber positioned within the vacuum chamber adapted to contain a coolant for cooling target apparatus, and a mechanical refrigerator for refrigerating the coolant and having at least one cooled part in c... | 10/30/2007 |
| 7266954 | Method and device for installing refrigerator A partition member partitions off a cooling stage of a refrigerator from a refrigerant container, containing a refrigerant gas condensed by the cooling stage, of a cooling system, and a low melting point metal held in the partition member brings the cooling stage in... | 09/11/2007 |
| 7218195 | Method and apparatus for magnetizing a permanent magnet A magnetizing coil unit and a method of making a magnetizing coil unit is provided. The coil includes a solenoid coil having a coiled copper sheet in which the width of the copper sheet is equal to the height of the solenoid coil. A magnetizing assembly includes a p... | 05/15/2007 |
| 7180292 | Cooling of coils in magnetic resonance imaging An MRIS gradient coil structure has coiled tubes for carrying a cooling medium to cool the coil structure. The inlet and outlet of the coiled tubes are insulated electrically from the remainder thereof by a ceramic insulator. ... | 02/20/2007 |
| 7170377 | Superconductive magnet including a cryocooler coldhead A zero boiloff cryogen cooled recondensing superconducting magnet assembly including superconducting magnet coils suitable for magnetic resonance imaging including a cryogen pressure vessel to contain a liquid cryogen reservoir to provide cryogenic temperatures to t... | 01/30/2007 |
| 7167000 | Cryogenically cooled radiofrequency coil array for magnetic resonance imaging A cryogenically cooled radiofrequency (RF) coil structure for use in Magnetic Resonance Imaging (MRI) and method for cryogenically cooling RF coils are provided. The cryogenically cooled RF coil structure comprises a sealed structure constructed of non-conducting ma... | 01/23/2007 |
| 7148776 | Electromagnetic clamp and method for clamping a structure The electromagnetic clamp and method includes an electromagnet and a clamping piece located on opposite sides of a structure to clamp the structure. The electromagnet attracts the clamping piece through the structure when the electromagnet is energized, such that th... | 12/12/2006 |
| 7141979 | Cryo head with a plurality of heat exchangers for cooling the RF coils or resonators A cryohead (1) for nuclear magnetic resonance (NMR) measurements, comprising at least one detection channel for receiving NMR signals and at least one transmitting and decoupling channel, wherein different radio frequency (RF) coils or resonators (11, 12, ... | 11/28/2006 |
| 7135863 | Thermal management system and method for MRI gradient coil A thermal management system and method for cooling Magnetic Resonance Imaging gradient coils. The system includes least one first header tube positioned adjacent to said gradient coils and configured to transport a coolant fluid; at least one set of cooling tubes co... | 11/14/2006 |
| 7123014 | Magnetic gradient field projection The projection of magnetic gradient fields useful in Magnetic Resonance Imaging where projection of a gradient outside of a field generating assembly allows imaging of samples which will not physically fit inside the coil confines. The linearity of the projected gra... | 10/17/2006 |
| 7088210 | Electromagnet having spacer for facilitating cooling and associated cooling method An electromagnet and associated apparatus and method are provided. The electromagnet includes a core and at least one winding disposed circumferentially about the core such that the winding extends at least one revolution around the core. The electromagnet further i... | 08/08/2006 |
| 7057391 | Magnetic resonance imaging system A magnetic resonance imaging system is provided in which the two contradictory requirements, i.e., enhancing the feeling of being not confined by enlarging the subject-insertion space and decreasing magnetomotive force of the superconductive coils by bringing the su... | 06/06/2006 |
| 7053740 | Low field loss cold mass structure for superconducting magnets A structure for superconducting magnets is provided. The structure includes a thermally conductive electrically resistive composite bobbin, a superconducting coil disposed around the thermally conductive electrically resistive composite bobbin for conducting current... | 05/30/2006 |
| 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 made of a high electric-resistance material so that the magne... | 05/23/2006 |
| 7043925 | Densifier for simultaneous conditioning of two cryogenic liquids A densifier (10) for simultaneously densifying two cryogenic liquids at different temperatures is provided. The densifier (10) has a thermoacoustic heat engine (20), a resonance tube (18) and a two stage pulse tube refrigerator (40... | 05/16/2006 |
| 7030613 | Nuclear magnetic resonance measuring apparatus A double-tubular third transfer tube is provided in the transfer tube storage conduit, and a first transfer tube, second transfer tube and fourth transfer tube are installed in its interior. Further, pressure control valves are arranged in the portion of normal temp... | 04/18/2006 |
| 7013553 | Superconducting magnet coil support structure A superconducting magnet coil support structure (20) includes a solid body (21) having an exterior side (24), an interior portion (26), and an interior side (28). The interior portion has a base (36) that is formed of a firs... | 03/21/2006 |
| 7008275 | Electrical joint forming member and plasma processing apparatus An electrical joint forming member is held between adjacent conductive members included in a semiconductor device fabricating apparatus to reduce electrical resistance between those conductive members. The electrical joint forming member includes an elastic member m... | 03/07/2006 |
| 6970062 | Cooling of a MRI system A magnetic resonance imaging (MRI) system having an open superconducting magnet system (1) includes a number of horizontally oriented superconducting coils (3–10) in a cryogenic container (11). The cryogenic container contains a liquid cooling... | 11/29/2005 |
| 6952070 | Capped flat end windings in an electrical machine End windings of the field windings of a generator rotor body are flattened. A cap having a flat undersurface overlies the flattened end windings and an enclosure ring extends about the end windings and cap. Apertures are formed through the cap in communication with ... | 10/04/2005 |
| 6933817 | Support member for a superconducting magnet assembly A superconducting magnet assembly is described wherein the magnet cartridge is suspended within the vacuum chamber by a single support member extending from a wall of the vacuum chamber to the magnet cartridge. In one aspect, the support member includes a support tu... | 08/23/2005 |
| 6924723 | Cooling system for magnetic field generating device A magnetic field generating device comprising a frame about which a current carrying coil of conductor is wound. The frame preferably includes spaced-apart side panels and an auxiliary supplementary cooling system panel. Each of the panels is configured with a plura... | 08/02/2005 |
| 6909347 | Magnet for magnetic resonance imaging apparatus A magnet for MRI apparatus has a magnetic circuit which includes a magnetic flux path formed by a ferromagnetic material and a magnetic flux path formed by magnetic flux return coils or magnetic flux control coils, so that a 5-gauss line of leakage fluxes can be kep... | 06/21/2005 |
| 6906517 | Method and apparatus for maintaining thermal stability of permanent magnets in MRI systems Briefly in accordance with one aspect, the present technique provides a method for heating a permanent magnet in a magnetic resonance imaging system. The method for heating a permanent magnet includes directly heating a surface of the permanent magnet using a surfac... | 06/14/2005 |
| 6876288 | Transverse field bitter-type magnet A new type of coil magnet in which the plane of each turn of the conducting coil is rotated with respect to the central axis. This results in the induced magnetic field being oriented off the central axis. A set of two such disk assemblies are preferably nested, wit... | 04/05/2005 |
| 6847278 | Magnetic device A magnetic device which is highly durable, reliable, and safe without being damaged when a magnetic filed is applied. The magnetic device includes a cooling device having a cold head refrigerated by an effect of a cryogenic refrigerator, a magnetic field generation ... | 01/25/2005 |
| 6816051 | Superconducting magnet and magnetic resonance imaging apparatus using the same Effect of vibration of a refrigerator on a superconducting coil is reduced to reduce disturbance in an image. A coolant tank for supplying a coolant to coil containers is provided separately from the coil containers, and the refrigerator is placed in the cool... | 11/09/2004 |
| 6741152 | Directly cooled magnetic coil, particularly a gradient coil, and method for manufacturing conductors therefor A directly cooled magnetic coil, particularly a gradient coil for a magnetic resonance apparatus, has the conductors forming the windings which are provided with an inner cooling channel for conducting a cooling fluid therethrough, and the conductors are fashioned a... | 05/25/2004 |
| 6489873 | Temperature control system for a permanent magnetic system A temperature control system for a permanent magnetic assembly in a permanent magnetic system comprises thermoelectric heat pumping devices which are in thermal contact with a yoke of the permanent magnet system. The heat pumping devices are controlled by... | 12/03/2002 |
| 6441710 | Superconducting magnet apparatus and method for magnetizing superconductor A cold head is disposed in an insulating container and cooled by a refrigerator. A superconductor is disposed in the insulating container, contacting the cold head, and is cooled to its superconduction transition temperature or lower by heat conduction. A... | 08/27/2002 |
| 6441711 | Magnetizing magnet A high temperature superconductor (HTSC) 5 is magnetized between drive coils 1,2 forming poles of a magnet connected by an iron yoke 9 by relative movement of a vacuum insulated cryostat 4 containing the HTSC and the magnetizing magnet, in order to magnet... | 08/27/2002 |
| 6396377 | Liquid cryogen-free superconducting magnet system A superconducting magnet assembly having two individual magnetic coils contained in separate vacuum jackets with a radiation shield between each magnet and its respective vacuum jacket. Each magnet coil is cooled to superconducting temperature by direct c... | 05/28/2002 |
| 6396376 | Apparatus and method for a superconductive magnet with pole piece A magnet, such as an open magnetic-resonance-imaging (MRI) magnet) has a first assembly including a superconductive main coil and a magnetizable pole piece which, during magnet operation, has a temperature equal to generally the temperature of the main co... | 05/28/2002 |
| 6323749 | MRI with superconducting coil A magnetic resonance imaging magnet for examining a patient comprises ferromagnetic pole pieces defining a patient-receiving gap for examining a patient. Coil assemblies for producing a magnetic field include at least one coil mounted adjacent to at least... | 11/27/2001 |
| 6246308 | Superconductive magnet including a cryocooler coldhead A magnet, such as an open or closed magnet, has a first assembly with at least one superconductive main coil and with a first vacuum enclosure enclosing the main coil(s). A first cryocooler coldhead has a rigid first housing and is generally vertically al... | 06/12/2001 |
