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GB2282451B - Improvements in or relating to MRI magnets - Google Patents

Improvements in or relating to MRI magnets

Info

Publication number
GB2282451B
GB2282451B GB9417541A GB9417541A GB2282451B GB 2282451 B GB2282451 B GB 2282451B GB 9417541 A GB9417541 A GB 9417541A GB 9417541 A GB9417541 A GB 9417541A GB 2282451 B GB2282451 B GB 2282451B
Authority
GB
United Kingdom
Prior art keywords
relating
mri magnets
mri
magnets
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.)
Revoked
Application number
GB9417541A
Other versions
GB2282451A (en
GB9417541D0 (en
Inventor
Jonathan Leslie Allis
Alan George Andrew M Armstrong
Robin Thomas Elliott
Michael Ben Sellers
Magnet Technology Limit Oxford
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.)
Siemens Magnet Technology Ltd
Original Assignee
Oxford Magnet Technology Ltd
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 Oxford Magnet Technology Ltd filed Critical Oxford Magnet Technology Ltd
Priority to EP94114292A priority Critical patent/EP0645641B1/en
Priority to DE69419096T priority patent/DE69419096T2/en
Priority to US08/305,867 priority patent/US5680086A/en
Priority to JP23363694A priority patent/JP3548240B2/en
Publication of GB9417541D0 publication Critical patent/GB9417541D0/en
Publication of GB2282451A publication Critical patent/GB2282451A/en
Application granted granted Critical
Publication of GB2282451B publication Critical patent/GB2282451B/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • 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
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
GB9417541A 1993-09-29 1994-09-01 Improvements in or relating to MRI magnets Revoked GB2282451B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP94114292A EP0645641B1 (en) 1993-09-29 1994-09-12 Improvements in or relating to MRI magnets
DE69419096T DE69419096T2 (en) 1993-09-29 1994-09-12 Magnetic resonance imaging enhancements
US08/305,867 US5680086A (en) 1993-09-29 1994-09-14 MRI magnets
JP23363694A JP3548240B2 (en) 1993-09-29 1994-09-28 Magnetic resonance imaging (MRI) magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939320043A GB9320043D0 (en) 1993-09-29 1993-09-29 Improvements in or relating to mri magnets

Publications (3)

Publication Number Publication Date
GB9417541D0 GB9417541D0 (en) 1994-10-19
GB2282451A GB2282451A (en) 1995-04-05
GB2282451B true GB2282451B (en) 1997-11-12

Family

ID=10742680

Family Applications (2)

Application Number Title Priority Date Filing Date
GB939320043A Pending GB9320043D0 (en) 1993-09-29 1993-09-29 Improvements in or relating to mri magnets
GB9417541A Revoked GB2282451B (en) 1993-09-29 1994-09-01 Improvements in or relating to MRI magnets

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB939320043A Pending GB9320043D0 (en) 1993-09-29 1993-09-29 Improvements in or relating to mri magnets

Country Status (1)

Country Link
GB (2) GB9320043D0 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294120A (en) * 1994-09-22 1996-04-17 Univ California Eddy current-less pole tips for MRI magnets
GB2311375B (en) 1996-03-20 2000-08-23 Oxford Magnet Tech Improvements in or relating to MRI magnets
US6150818A (en) * 1998-08-31 2000-11-21 General Electric Company Low eddy current and low hysteresis magnet pole faces in MR imaging
GB2355800B (en) * 1999-10-29 2004-10-27 Oxford Magnet Tech Improved magnet
US6783059B2 (en) * 2002-12-23 2004-08-31 General Electric Company Conduction cooled passively-shielded MRI magnet
CN100434928C (en) * 2003-05-23 2008-11-19 西门子（中国）有限公司 Magnetic field generating system used for magnetic resonance equipment
ITSV20040020A1 (en) 2004-05-07 2004-08-07 Esaote Spa MAGNETIC STRUCTURE FOR MRI AND MRI MACHINES
EP2179300B1 (en) 2007-07-26 2013-04-10 Emscan Limited Magnet assembly

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284439A1 (en) * 1987-03-27 1988-09-28 Sumitomo Special Metals Co. Ltd. Magnetic field generating device
US4827235A (en) * 1986-07-18 1989-05-02 Kabushiki Kaisha Toshiba Magnetic field generator useful for a magnetic resonance imaging instrument
JPH02184002A (en) * 1989-01-10 1990-07-18 Sumitomo Special Metals Co Ltd Magnetic field generator for mri
EP0407227A2 (en) * 1989-07-07 1991-01-09 Sumitomo Special Metal Co., Ltd. Magnetic field generating device for MRI
EP0432750A2 (en) * 1989-12-13 1991-06-19 Shin-Etsu Chemical Co., Ltd. Apparatus for generating uniform magnetic field using small diameter spherical metallic members provided on magnetic poles
EP0479514A1 (en) * 1990-09-29 1992-04-08 Sumitomo Special Metals Co., Ltd. Magnetic field generating device used for MRI
US5124651A (en) * 1990-10-24 1992-06-23 Fonar Corporation Nuclear magnetic resonance scanners with composite pole facings
US5166619A (en) * 1989-12-11 1992-11-24 Siemens Aktiengesellschaft Gradient coil assembly for a magnetic resonance imaging apparatus
JPH1065808A (en) * 1996-08-15 1998-03-06 Fujitsu Ltd Local line termination connection device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827235A (en) * 1986-07-18 1989-05-02 Kabushiki Kaisha Toshiba Magnetic field generator useful for a magnetic resonance imaging instrument
EP0284439A1 (en) * 1987-03-27 1988-09-28 Sumitomo Special Metals Co. Ltd. Magnetic field generating device
JPH02184002A (en) * 1989-01-10 1990-07-18 Sumitomo Special Metals Co Ltd Magnetic field generator for mri
EP0407227A2 (en) * 1989-07-07 1991-01-09 Sumitomo Special Metal Co., Ltd. Magnetic field generating device for MRI
US5166619A (en) * 1989-12-11 1992-11-24 Siemens Aktiengesellschaft Gradient coil assembly for a magnetic resonance imaging apparatus
EP0432750A2 (en) * 1989-12-13 1991-06-19 Shin-Etsu Chemical Co., Ltd. Apparatus for generating uniform magnetic field using small diameter spherical metallic members provided on magnetic poles
EP0479514A1 (en) * 1990-09-29 1992-04-08 Sumitomo Special Metals Co., Ltd. Magnetic field generating device used for MRI
US5124651A (en) * 1990-10-24 1992-06-23 Fonar Corporation Nuclear magnetic resonance scanners with composite pole facings
JPH1065808A (en) * 1996-08-15 1998-03-06 Fujitsu Ltd Local line termination connection device

Also Published As

Publication number Publication date
GB2282451A (en) 1995-04-05
GB9417541D0 (en) 1994-10-19
GB9320043D0 (en) 1993-11-17

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Legal Events

Date Code Title Description
773K Patent revoked under sect. 73(2)/1977