IL91537A - Passive shims for correction of (3,2) and (3,-2) harmonic terms in magnetic resonance magnets - Google Patents

Passive shims for correction of (3,2) and (3,-2) harmonic terms in magnetic resonance magnets

Info

Publication number
IL91537A
IL91537A IL91537A IL9153789A IL91537A IL 91537 A IL91537 A IL 91537A IL 91537 A IL91537 A IL 91537A IL 9153789 A IL9153789 A IL 9153789A IL 91537 A IL91537 A IL 91537A
Authority
IL
Israel
Prior art keywords
correction
magnetic resonance
harmonic terms
passive shims
resonance magnets
Prior art date
Application number
IL91537A
Other languages
English (en)
Other versions
IL91537A0 (en
Original Assignee
Gen Electric
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 Gen Electric filed Critical Gen Electric
Publication of IL91537A0 publication Critical patent/IL91537A0/xx
Publication of IL91537A publication Critical patent/IL91537A/xx

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

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
IL91537A 1988-12-22 1989-09-06 Passive shims for correction of (3,2) and (3,-2) harmonic terms in magnetic resonance magnets IL91537A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/288,346 US4853663A (en) 1988-12-22 1988-12-22 Passive shims for correction of (3,2) and (3,-2) harmonic terms in magnetic resonance magnets

Publications (2)

Publication Number Publication Date
IL91537A0 IL91537A0 (en) 1990-04-29
IL91537A true IL91537A (en) 1993-05-13

Family

ID=23106711

Family Applications (1)

Application Number Title Priority Date Filing Date
IL91537A IL91537A (en) 1988-12-22 1989-09-06 Passive shims for correction of (3,2) and (3,-2) harmonic terms in magnetic resonance magnets

Country Status (5)

Country Link
US (1) US4853663A (enExample)
EP (1) EP0374377B1 (enExample)
JP (1) JPH02185233A (enExample)
DE (1) DE68928610T2 (enExample)
IL (1) IL91537A (enExample)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8912601D0 (en) * 1989-06-01 1989-07-19 Oxford Magnet Tech Magnetic field generating apparatus
US5045794A (en) * 1989-12-04 1991-09-03 General Electric Company Method of optimizing passive shim placement in magnetic resonance magnets
US5343183A (en) * 1990-11-09 1994-08-30 Mitsubishi Denki Kabushiki Kaisha Magnetic field correction device
US5266913A (en) * 1991-08-27 1993-11-30 British Technology Group Usa Inc. Screened electromagnetic coil of restricted length having optimized field and method
BE1007783A3 (nl) * 1993-11-25 1995-10-17 Philips Electronics Nv Magnetisch resonantie apparaat met elementen voor het homogeniseren van het magneetveld.
US5418462A (en) * 1994-05-02 1995-05-23 Applied Superconetics, Inc. Method for determining shim placement on tubular magnet
US5532597A (en) * 1994-11-04 1996-07-02 Picker International, Inc. Passive shimming technique for MRI magnets
US5635839A (en) * 1994-11-04 1997-06-03 Picker International, Inc. High order passive shimming assembly for MRI magnets
US5623430A (en) * 1995-01-17 1997-04-22 General Electric Company Method for passively shimming an open magnet
US5677854A (en) * 1995-01-17 1997-10-14 General Electric Company Method for passively shimming a magnet
US5550472A (en) * 1995-04-13 1996-08-27 Picker International, Inc. Combined radio frequency coil with integral magnetic field shim set
US5659250A (en) * 1996-03-19 1997-08-19 Intermagnetics General Corporation Full brick construction of magnet assembly having a central bore
GB2337595B (en) 1998-05-22 2003-03-19 Oxford Magnet Tech Improvements in or relating to magnetic resonance imaging systems
US5992006A (en) * 1998-12-23 1999-11-30 Fonar Corporation Method for passive control of magnet hemogeneity
GB9924833D0 (en) * 1999-10-20 1999-12-22 Btg Int Ltd Permanent magnet and shim design
US6634088B1 (en) 2000-03-31 2003-10-21 Fonar Corporation Method and apparatus for shimming a magnet to control a three-dimensional field
DE10104054C1 (de) * 2001-01-31 2002-07-04 Bruker Ag Faellanden Magnetanordnung mit einem supraleitenden Magnetspulensystem und einer magnetischen Feldformvorrichtung für hochauflösende magnetische Resonanzspektroskopie und Verfahren zur Bestimmung von Fertigungstoleranzen der Feldformvorrichtung
US6836119B2 (en) 2002-10-15 2004-12-28 Koninklijke Philips Electronics, N.V. Method and apparatus for aligning a magnetic field modifying structure in a magnetic resonance imaging scanner
JP5818267B2 (ja) * 2009-12-02 2015-11-18 ナナリシス コーポレーション 均一な磁場を生み出すための方法および装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5960346A (ja) * 1982-09-30 1984-04-06 Toshiba Corp 磁気共鳴イメージング装置用傾斜磁場コイルユニット
DE8419763U1 (de) * 1984-07-02 1986-03-20 Siemens AG, 1000 Berlin und 8000 München Kernspin-Tomographiegerät
NL8502340A (nl) * 1985-08-26 1987-03-16 Philips Nv Magnetisch resonantie apparaat met veld homogeniserende magnetische elementen.
US4771244A (en) * 1986-12-03 1988-09-13 General Electric Company Method of passively shimming magnetic resonance magnets
US4698611A (en) * 1986-12-03 1987-10-06 General Electric Company Passive shimming assembly for MR magnet
EP0345300A1 (en) * 1987-04-15 1989-12-13 Oxford Medical Limited Magnetic field generating apparatus
DE3866060D1 (de) * 1987-08-14 1991-12-12 Siemens Ag Elektrischer magnet fuer kernspin-thomographen.

Also Published As

Publication number Publication date
JPH02185233A (ja) 1990-07-19
US4853663A (en) 1989-08-01
DE68928610T2 (de) 1998-10-15
IL91537A0 (en) 1990-04-29
DE68928610D1 (de) 1998-04-23
EP0374377B1 (en) 1998-03-18
JPH0418854B2 (enExample) 1992-03-27
EP0374377A3 (en) 1991-01-30
EP0374377A2 (en) 1990-06-27

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