DE69501858D1 - Magnet mit Polflächen - Google Patents

Magnet mit Polflächen

Info

Publication number
DE69501858D1
DE69501858D1 DE69501858T DE69501858T DE69501858D1 DE 69501858 D1 DE69501858 D1 DE 69501858D1 DE 69501858 T DE69501858 T DE 69501858T DE 69501858 T DE69501858 T DE 69501858T DE 69501858 D1 DE69501858 D1 DE 69501858D1
Authority
DE
Germany
Prior art keywords
magnet
pole faces
pole
faces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE69501858T
Other languages
English (en)
Other versions
DE69501858T2 (de
Inventor
Bizhan Dorri
Michele Dollar Ogle
Evangelos Trifon Laskaris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of DE69501858D1 publication Critical patent/DE69501858D1/de
Application granted granted Critical
Publication of DE69501858T2 publication Critical patent/DE69501858T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/387—Compensation of inhomogeneities
    • G01R33/3873—Compensation of inhomogeneities using ferromagnetic bodies ; Passive shimming
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/3806—Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
DE69501858T 1994-07-27 1995-06-26 Magnet mit Polflächen Expired - Fee Related DE69501858T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/280,976 US5446434A (en) 1994-07-27 1994-07-27 Magnet having pole faces with trapezoidal-shaped shims

Publications (2)

Publication Number Publication Date
DE69501858D1 true DE69501858D1 (de) 1998-04-30
DE69501858T2 DE69501858T2 (de) 1998-10-22

Family

ID=23075439

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69501858T Expired - Fee Related DE69501858T2 (de) 1994-07-27 1995-06-26 Magnet mit Polflächen

Country Status (4)

Country Link
US (1) US5446434A (de)
EP (1) EP0694790B1 (de)
JP (1) JP4168119B2 (de)
DE (1) DE69501858T2 (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5798680A (en) * 1994-04-15 1998-08-25 New York University Strapped open magnetic structure
US5677854A (en) * 1995-01-17 1997-10-14 General Electric Company Method for passively shimming a magnet
US5864236A (en) * 1996-07-05 1999-01-26 Toshiba America Mri, Inc. Open configuration MRI magnetic flux path
DE19638230C1 (de) * 1996-09-19 1998-05-28 Bruker Analytische Messtechnik Ferromagnetische Raumabschirmung für den supraleitenden Hochfeldmagneten eines NMR-Spektrometers
US6011396A (en) * 1998-01-02 2000-01-04 General Electric Company Adjustable interventional magnetic resonance imaging magnet
US5883558A (en) * 1998-02-19 1999-03-16 General Electric Company Open superconductive magnet having shielding
US5874882A (en) * 1998-02-19 1999-02-23 General Electric Company Open and shielded superconductive magnet
US5874880A (en) * 1998-03-05 1999-02-23 General Electric Company Shielded and open superconductive magnet
US5923235A (en) * 1998-10-23 1999-07-13 General Electric Company Shim assembly for a pole face of a magnet
US6255928B1 (en) 1998-11-02 2001-07-03 General Electric Company Magnet having a shim for a laminated pole piece
US5992006A (en) * 1998-12-23 1999-11-30 Fonar Corporation Method for passive control of magnet hemogeneity
WO2001053847A1 (en) 2000-01-19 2001-07-26 Millennium Technology Inc. C-shaped magnetic resonance imaging system
US6973711B1 (en) * 2000-05-24 2005-12-13 Fonar Corporation Method for making pieces for a magnetic resonance imaging magnet
US6809519B2 (en) * 2001-07-12 2004-10-26 Shin-Etsu Chemical Co., Ltd. Inclined magnetic field generation coil and magnetic field generator for MRI
US6984982B2 (en) * 2002-07-29 2006-01-10 Ge Medical Systems Global Technology Company Llc Method and system for shimming an MRI magnet assembly
JP3733441B1 (ja) * 2004-07-02 2006-01-11 株式会社日立製作所 磁気共鳴撮像装置及びその磁石装置
JP5481070B2 (ja) 2006-01-19 2014-04-23 マサチューセッツ インスティテュート オブ テクノロジー 粒子加速のための磁場生成方法、磁石構造体及びその製造方法
WO2018174726A2 (en) 2017-03-24 2018-09-27 Victoria Link Limited Mri magnet and apparatus

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682111A (en) * 1985-03-05 1987-07-21 Kabushiki Kaisha Toshiba Magnetic resonance imaging magnet
JPS63241905A (ja) * 1987-03-27 1988-10-07 Sumitomo Special Metals Co Ltd 磁界発生装置
US4924198A (en) * 1988-07-05 1990-05-08 General Electric Company Superconductive magnetic resonance magnet without cryogens
IL87162A (en) * 1988-07-20 1991-12-15 Elscint Ltd System for passively improving magnetic field homogeneity
US4985678A (en) * 1988-10-14 1991-01-15 Picker International, Inc. Horizontal field iron core magnetic resonance scanner
US5134374A (en) * 1989-06-01 1992-07-28 Applied Superconetics Magnetic field control apparatus
US4943774A (en) * 1989-06-01 1990-07-24 General Atomics Magnetic field control apparatus
US5003276A (en) * 1989-08-11 1991-03-26 General Atomics Method of site shimming on permanent magnets
US5045794A (en) * 1989-12-04 1991-09-03 General Electric Company Method of optimizing passive shim placement in magnetic resonance magnets
GB2244134B (en) * 1990-04-09 1994-08-03 Elscint Ltd Superconducting magnet
US5124651A (en) * 1990-10-24 1992-06-23 Fonar Corporation Nuclear magnetic resonance scanners with composite pole facings
US5317298A (en) * 1993-01-04 1994-05-31 General Electric Company Apparatus and method for passive shimming of a superconducting magnet which images human limbs
US5345208A (en) * 1993-05-26 1994-09-06 General Electric Company Pole face design for a C-shaped superconducting magnet

Also Published As

Publication number Publication date
US5446434A (en) 1995-08-29
DE69501858T2 (de) 1998-10-22
JP4168119B2 (ja) 2008-10-22
EP0694790A1 (de) 1996-01-31
JPH08172011A (ja) 1996-07-02
EP0694790B1 (de) 1998-03-25

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Representative=s name: ROEGER UND KOLLEGEN, 73728 ESSLINGEN

8339 Ceased/non-payment of the annual fee