DE69700319D1 - Magnetanordnung für die bildgebende magnetische Resonanz mit gegenüberliegenden Permanentmagneten - Google Patents
Magnetanordnung für die bildgebende magnetische Resonanz mit gegenüberliegenden PermanentmagnetenInfo
- Publication number
- DE69700319D1 DE69700319D1 DE69700319T DE69700319T DE69700319D1 DE 69700319 D1 DE69700319 D1 DE 69700319D1 DE 69700319 T DE69700319 T DE 69700319T DE 69700319 T DE69700319 T DE 69700319T DE 69700319 D1 DE69700319 D1 DE 69700319D1
- Authority
- DE
- Germany
- Prior art keywords
- magnetic resonance
- permanent magnets
- magnet arrangement
- imaging magnetic
- opposing permanent
- 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 - Lifetime
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
- G01R33/383—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
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8091049A JP3014319B2 (ja) | 1996-04-12 | 1996-04-12 | 磁石対向型永久磁石回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69700319D1 true DE69700319D1 (de) | 1999-08-19 |
DE69700319T2 DE69700319T2 (de) | 1999-11-04 |
Family
ID=14015658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69700319T Expired - Lifetime DE69700319T2 (de) | 1996-04-12 | 1997-04-09 | Magnetanordnung für die bildgebende magnetische Resonanz mit gegenüberliegenden Permanentmagneten |
Country Status (4)
Country | Link |
---|---|
US (1) | US5825187A (de) |
EP (1) | EP0801314B1 (de) |
JP (1) | JP3014319B2 (de) |
DE (1) | DE69700319T2 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69737511T2 (de) * | 1997-12-26 | 2007-07-26 | Neomax Co., Ltd. | Magnetfeld-Erzeuger für die Bildgebende Magnetische Resonanz |
GB2400916B (en) * | 1999-10-29 | 2004-12-29 | Oxford Magnet Tech | Improved magnet |
JP3705995B2 (ja) * | 2000-04-19 | 2005-10-12 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 勾配コイル製造方法および勾配コイル並びに磁気共鳴撮影装置 |
US7034537B2 (en) * | 2001-03-14 | 2006-04-25 | Hitachi Medical Corporation | MRI apparatus correcting vibratory static magnetic field fluctuations, by utilizing the static magnetic fluctuation itself |
US6518867B2 (en) | 2001-04-03 | 2003-02-11 | General Electric Company | Permanent magnet assembly and method of making thereof |
US6662434B2 (en) | 2001-04-03 | 2003-12-16 | General Electric Company | Method and apparatus for magnetizing a permanent magnet |
DE10219091A1 (de) * | 2002-04-29 | 2003-11-20 | Siemens Ag | Drehbewegungsdetektor |
US7423431B2 (en) * | 2003-09-29 | 2008-09-09 | General Electric Company | Multiple ring polefaceless permanent magnet and method of making |
US7148689B2 (en) | 2003-09-29 | 2006-12-12 | General Electric Company | Permanent magnet assembly with movable permanent body for main magnetic field adjustable |
CA2884097C (en) | 2014-03-13 | 2020-04-21 | LT Imaging Inc. | Magnetic resonance imaging (mri) system and method |
US10945631B2 (en) | 2019-07-18 | 2021-03-16 | Sigwa Company, Llc | Magnet assembly for magnetic resonance imaging (MRI) scanning system |
US11333727B2 (en) | 2019-12-10 | 2022-05-17 | Hyperfine Operations, Inc. | Ferromagnetic frame for magnetic resonance imaging |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8402360D0 (en) * | 1984-01-30 | 1984-02-29 | Picker Int Ltd | Nmr shims |
JPH0280033A (ja) * | 1988-09-16 | 1990-03-20 | Toshiba Corp | 永久磁石型磁気共鳴イメージング装置 |
US5061897A (en) * | 1990-03-23 | 1991-10-29 | Fonar Corporation | Eddy current control in magnetic resonance imaging |
US5414399A (en) * | 1991-12-19 | 1995-05-09 | Applied Superconetics, Inc. | Open access superconducting MRI magnet having an apparatus for reducing magnetic hysteresis in superconducting MRI systems |
US5495171A (en) * | 1993-01-19 | 1996-02-27 | Fonar Corporation | Eddy current control in NMR imaging systems |
DE59406586D1 (de) * | 1993-03-15 | 1998-09-10 | Siemens Ag | Homogenfeldmagnet mit über Korrekturluftspalte beabstandeten Polplatteneinrichtungen seiner Polschuhe |
FI105293B (fi) * | 1993-06-08 | 2000-07-14 | Picker Nordstar Oy | Magneettikuvaukseen käytettävän magneetin napakenkä |
JPH0831635A (ja) * | 1994-07-08 | 1996-02-02 | Sumitomo Special Metals Co Ltd | Mri用磁界発生装置 |
-
1996
- 1996-04-12 JP JP8091049A patent/JP3014319B2/ja not_active Expired - Fee Related
-
1997
- 1997-04-09 DE DE69700319T patent/DE69700319T2/de not_active Expired - Lifetime
- 1997-04-09 EP EP97302421A patent/EP0801314B1/de not_active Expired - Lifetime
- 1997-04-11 US US08/843,053 patent/US5825187A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH09283327A (ja) | 1997-10-31 |
US5825187A (en) | 1998-10-20 |
EP0801314A1 (de) | 1997-10-15 |
DE69700319T2 (de) | 1999-11-04 |
EP0801314B1 (de) | 1999-07-14 |
JP3014319B2 (ja) | 2000-02-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition |