CN1252977A - 磁共振成像中的低涡流和低磁滞的磁极面 - Google Patents

磁共振成像中的低涡流和低磁滞的磁极面 Download PDF

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Publication number
CN1252977A
CN1252977A CN99118614A CN99118614A CN1252977A CN 1252977 A CN1252977 A CN 1252977A CN 99118614 A CN99118614 A CN 99118614A CN 99118614 A CN99118614 A CN 99118614A CN 1252977 A CN1252977 A CN 1252977A
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CN
China
Prior art keywords
magnetic
open
flux
imaging system
pole
Prior art date
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Pending
Application number
CN99118614A
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English (en)
Chinese (zh)
Inventor
W·D·巴伯
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General Electric Co
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General Electric Co
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Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of CN1252977A publication Critical patent/CN1252977A/zh
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H01F7/202—Electromagnets for high magnetic field strength
    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
    • G01R33/56518—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to eddy currents, e.g. caused by switching of the gradient magnetic field

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
CN99118614A 1998-08-31 1999-08-31 磁共振成像中的低涡流和低磁滞的磁极面 Pending CN1252977A (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/143,960 US6150818A (en) 1998-08-31 1998-08-31 Low eddy current and low hysteresis magnet pole faces in MR imaging
US09/143,960 1998-08-31

Publications (1)

Publication Number Publication Date
CN1252977A true CN1252977A (zh) 2000-05-17

Family

ID=22506461

Family Applications (1)

Application Number Title Priority Date Filing Date
CN99118614A Pending CN1252977A (zh) 1998-08-31 1999-08-31 磁共振成像中的低涡流和低磁滞的磁极面

Country Status (6)

Country Link
US (1) US6150818A (https=)
EP (1) EP0984461B1 (https=)
JP (1) JP4481395B2 (https=)
KR (1) KR20000017646A (https=)
CN (1) CN1252977A (https=)
DE (1) DE69929857T2 (https=)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003082106A1 (fr) * 2002-04-01 2003-10-09 Shenyang Neusoft Bopu Nmr Tech Co., Ltd. Aimant permanent pour resonance magnetique
US7084632B2 (en) 2002-04-01 2006-08-01 Shenyang Neusoft Bopu Nmr Tech Co., Ltd. Permanent magnet for magnet resonance
CN101256221B (zh) * 2007-02-28 2010-09-29 西门子（中国）有限公司 一种减小梯度磁场导致的涡流的方法
CN103860178A (zh) * 2014-03-21 2014-06-18 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体
CN103892834A (zh) * 2014-03-21 2014-07-02 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体
CN104407314A (zh) * 2014-11-26 2015-03-11 江苏美时医疗技术有限公司 一种永磁体抗涡流组件

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6331363B1 (en) 1998-11-06 2001-12-18 Honeywell International Inc. Bulk amorphous metal magnetic components
US6346337B1 (en) 1998-11-06 2002-02-12 Honeywell International Inc. Bulk amorphous metal magnetic component
US6348275B1 (en) 1998-11-06 2002-02-19 Honeywell International Inc. Bulk amorphous metal magnetic component
US6552639B2 (en) 2000-04-28 2003-04-22 Honeywell International Inc. Bulk stamped amorphous metal magnetic component
ITSV20000023A1 (it) * 2000-06-15 2001-12-15 Esaote Spa Procedimento per la realizzazione di dispositivi di generazione di campi magnetici nelle macchine per il rilevamento di immagini in risonanz
US6737951B1 (en) 2002-11-01 2004-05-18 Metglas, Inc. Bulk amorphous metal inductive device
US6873239B2 (en) 2002-11-01 2005-03-29 Metglas Inc. Bulk laminated amorphous metal inductive device
ITSV20030011A1 (it) * 2003-03-31 2004-10-01 Esaote Spa Struttura magnetica per macchine di acquisiszione di
US7235910B2 (en) 2003-04-25 2007-06-26 Metglas, Inc. Selective etching process for cutting amorphous metal shapes and components made thereof
US6937018B2 (en) * 2003-10-31 2005-08-30 General Electric Company Systems and methods for fabricating pole pieces for magnetic resonance imaging systems
ITSV20040016A1 (it) * 2004-04-13 2004-07-13 Esaote Spa Macchina per risonanza magnetico nucleare
JP2006149722A (ja) * 2004-11-30 2006-06-15 Ge Medical Systems Global Technology Co Llc マグネットシステムおよびｍｒｉ装置
US20110234347A1 (en) * 2010-03-24 2011-09-29 Aspect Magnet Technologies Ltd. Pole piece for permanent magnet mri systems
JP2014236827A (ja) * 2013-06-07 2014-12-18 株式会社日立メディコ 磁気共鳴イメージング装置
JP6368625B2 (ja) * 2014-11-18 2018-08-01 株式会社日立製作所 磁気共鳴イメージング装置
EP4019995B1 (en) * 2020-12-22 2023-08-16 Bruker BioSpin GmbH Epr spectrometer with at least one pole piece made at least partially of a function material
US12099104B2 (en) 2023-01-20 2024-09-24 Fujifilm Healthcare Americas Corporation Passive shield for magnetic resonance imaging gradient coils

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951247A (en) * 1946-02-19 1960-08-30 Halpern Otto Isotropic absorbing layers
US4675609A (en) * 1985-09-18 1987-06-23 Fonar Corporation Nuclear magnetic resonance apparatus including permanent magnet configuration
US4827235A (en) * 1986-07-18 1989-05-02 Kabushiki Kaisha Toshiba Magnetic field generator useful for a magnetic resonance imaging instrument
JPH01142028A (ja) * 1987-11-30 1989-06-02 Kawasaki Steel Corp 磁気特性の優れた厚肉鋼材の製造方法
US5061897A (en) * 1990-03-23 1991-10-29 Fonar Corporation Eddy current control in magnetic resonance imaging
US5252924A (en) * 1991-11-18 1993-10-12 Sumitomo Special Metals Co., Ltd. Magnetic field generating apparatus for MRI
SG43224A1 (en) * 1990-09-29 1997-10-17 Sumitomo Spec Metals Magnetic field generating device used for MRI
US5470646A (en) * 1992-06-11 1995-11-28 Kabushiki Kaisha Toshiba Magnetic core and method of manufacturing core
US5495171A (en) * 1993-01-19 1996-02-27 Fonar Corporation Eddy current control in NMR imaging systems
FI105293B (fi) * 1993-06-08 2000-07-14 Picker Nordstar Oy Magneettikuvaukseen käytettävän magneetin napakenkä
GB9320043D0 (en) * 1993-09-29 1993-11-17 Oxford Magnet Rechnology Limit Improvements in or relating to mri magnets

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003082106A1 (fr) * 2002-04-01 2003-10-09 Shenyang Neusoft Bopu Nmr Tech Co., Ltd. Aimant permanent pour resonance magnetique
US7084632B2 (en) 2002-04-01 2006-08-01 Shenyang Neusoft Bopu Nmr Tech Co., Ltd. Permanent magnet for magnet resonance
CN101256221B (zh) * 2007-02-28 2010-09-29 西门子（中国）有限公司 一种减小梯度磁场导致的涡流的方法
CN103860178A (zh) * 2014-03-21 2014-06-18 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体
CN103892834A (zh) * 2014-03-21 2014-07-02 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体
CN103892834B (zh) * 2014-03-21 2016-05-25 沈阳中北真空磁电科技有限公司 一种用于核磁共振成像仪的永磁体
CN104407314A (zh) * 2014-11-26 2015-03-11 江苏美时医疗技术有限公司 一种永磁体抗涡流组件

Also Published As

Publication number Publication date
KR20000017646A (ko) 2000-03-25
DE69929857T2 (de) 2006-11-02
JP2000083925A (ja) 2000-03-28
DE69929857D1 (de) 2006-04-20
EP0984461A2 (en) 2000-03-08
EP0984461A3 (en) 2000-12-06
US6150818A (en) 2000-11-21
JP4481395B2 (ja) 2010-06-16
EP0984461B1 (en) 2006-02-15

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