GB2282451B - Improvements in or relating to MRI magnets - Google Patents
Improvements in or relating to MRI magnetsInfo
- 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
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)
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)
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 |
GB2400916B (en) * | 1999-10-29 | 2004-12-29 | 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)
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 | Connection device of incoming call to trunk line |
-
1993
- 1993-09-29 GB GB939320043A patent/GB9320043D0/en active Pending
-
1994
- 1994-09-01 GB GB9417541A patent/GB2282451B/en not_active Revoked
Patent Citations (9)
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 | Connection device of incoming call to trunk line |
Also Published As
Publication number | Publication date |
---|---|
GB2282451A (en) | 1995-04-05 |
GB9320043D0 (en) | 1993-11-17 |
GB9417541D0 (en) | 1994-10-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
773K | Patent revoked under sect. 73(2)/1977 |