WO2005081008A3 - Magnetic field homogeneity control using a plurality of sub-coils connected in series and operating at various currents - Google Patents

Magnetic field homogeneity control using a plurality of sub-coils connected in series and operating at various currents Download PDF

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Publication number
WO2005081008A3
WO2005081008A3 PCT/GB2005/000366 GB2005000366W WO2005081008A3 WO 2005081008 A3 WO2005081008 A3 WO 2005081008A3 GB 2005000366 W GB2005000366 W GB 2005000366W WO 2005081008 A3 WO2005081008 A3 WO 2005081008A3
Authority
WO
WIPO (PCT)
Prior art keywords
subcoils
series
magnetic field
sub
operating
Prior art date
Application number
PCT/GB2005/000366
Other languages
French (fr)
Other versions
WO2005081008A2 (en
Inventor
Ian Leitch Mcdougall
Peter Hanley
Original Assignee
Oxford Instr Plc
Ian Leitch Mcdougall
Peter Hanley
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 Instr Plc, Ian Leitch Mcdougall, Peter Hanley filed Critical Oxford Instr Plc
Priority to GB0615732A priority Critical patent/GB2427695B/en
Publication of WO2005081008A2 publication Critical patent/WO2005081008A2/en
Publication of WO2005081008A3 publication Critical patent/WO2005081008A3/en

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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
    • G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
    • G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
    • 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
    • G01R33/3875—Compensation of inhomogeneities using correction coil assemblies, e.g. active shimming

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Magnetic resonance apparatus comprises a magnet for generating, in a working region, a magnetic field of sufficient homogeneity to permit magnetic resonance signals to be obtained from a target material in the working region when in use. The magnet has a plurality of coils (100, 101, 102...), wherein at least one of the plurality of coils comprises a plurality of subcoils (200, 201...) arranged adjacent one another. Each of the coils and subcoils are connected in series. A common current supply (105) is arranged to supply a common current to each coil and each subcoil of the magnet. At least one auxiliary current supply (400, 401...) is arranged to supply auxiliary currents to each of the subcoils and a controller is adapted to set the respective auxiliary currents within the subcoils, so as to control the effective geometry and/or position of the coil(s) formed from the subcoils.
PCT/GB2005/000366 2004-02-12 2005-02-03 Magnetic field homogeneity control using a plurality of sub-coils connected in series and operating at various currents WO2005081008A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0615732A GB2427695B (en) 2004-02-12 2005-02-03 Magnetic Resonance Apparatus And Method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0403186.0 2004-02-12
GBGB0403186.0A GB0403186D0 (en) 2004-02-12 2004-02-12 Magnetic resonance apparatus and method

Publications (2)

Publication Number Publication Date
WO2005081008A2 WO2005081008A2 (en) 2005-09-01
WO2005081008A3 true WO2005081008A3 (en) 2005-10-06

Family

ID=32011833

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/000366 WO2005081008A2 (en) 2004-02-12 2005-02-03 Magnetic field homogeneity control using a plurality of sub-coils connected in series and operating at various currents

Country Status (2)

Country Link
GB (2) GB0403186D0 (en)
WO (1) WO2005081008A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2442750B (en) * 2006-10-10 2010-09-15 Siemens Magnet Technology Ltd Shimming of Magnet Systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689591A (en) * 1985-01-04 1987-08-25 Oxford Magnet Technology Limited Magnet assemblies for use in magnetic resonance imaging
EP0251342A2 (en) * 1983-11-11 1988-01-07 Oxford Medical Limited Magnet assembly
US4816962A (en) * 1985-10-24 1989-03-28 Mitsubishi Denki Kabushiki Kaisha Uniform magnetic field coil
US4945446A (en) * 1987-06-23 1990-07-31 Mitsubishi Denki Kabushiki Kaisha Magnetic field compensating apparatus
GB2329967A (en) * 1997-08-05 1999-04-07 Univ Queensland Superconducting magnet with internal correction coils

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251342A2 (en) * 1983-11-11 1988-01-07 Oxford Medical Limited Magnet assembly
US4689591A (en) * 1985-01-04 1987-08-25 Oxford Magnet Technology Limited Magnet assemblies for use in magnetic resonance imaging
US4816962A (en) * 1985-10-24 1989-03-28 Mitsubishi Denki Kabushiki Kaisha Uniform magnetic field coil
US4945446A (en) * 1987-06-23 1990-07-31 Mitsubishi Denki Kabushiki Kaisha Magnetic field compensating apparatus
GB2329967A (en) * 1997-08-05 1999-04-07 Univ Queensland Superconducting magnet with internal correction coils

Also Published As

Publication number Publication date
GB2427695A (en) 2007-01-03
WO2005081008A2 (en) 2005-09-01
GB0403186D0 (en) 2004-03-17
GB0615732D0 (en) 2006-09-20
GB2427695B (en) 2007-11-14

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