GB2027208B - Magnetic field correction in nmr apparatus - Google Patents

Magnetic field correction in nmr apparatus

Info

Publication number
GB2027208B
GB2027208B GB7921183A GB7921183A GB2027208B GB 2027208 B GB2027208 B GB 2027208B GB 7921183 A GB7921183 A GB 7921183A GB 7921183 A GB7921183 A GB 7921183A GB 2027208 B GB2027208 B GB 2027208B
Authority
GB
United Kingdom
Prior art keywords
magnetic field
field correction
nmr apparatus
nmr
correction
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
Application number
GB7921183A
Other versions
GB2027208A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Priority to GB7921183A priority Critical patent/GB2027208B/en
Publication of GB2027208A publication Critical patent/GB2027208A/en
Application granted granted Critical
Publication of GB2027208B publication Critical patent/GB2027208B/en
Expired legal-status Critical Current

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
    • G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
    • 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
    • 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
    • G01R33/56563—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F7/00—Regulating magnetic variables

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Signal Processing (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
GB7921183A 1978-08-05 1979-06-18 Magnetic field correction in nmr apparatus Expired GB2027208B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7921183A GB2027208B (en) 1978-08-05 1979-06-18 Magnetic field correction in nmr apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7832386 1978-08-05
GB7921183A GB2027208B (en) 1978-08-05 1979-06-18 Magnetic field correction in nmr apparatus

Publications (2)

Publication Number Publication Date
GB2027208A GB2027208A (en) 1980-02-13
GB2027208B true GB2027208B (en) 1982-12-15

Family

ID=26268464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7921183A Expired GB2027208B (en) 1978-08-05 1979-06-18 Magnetic field correction in nmr apparatus

Country Status (1)

Country Link
GB (1) GB2027208B (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3122686A1 (en) * 1981-06-06 1983-02-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt ARRANGEMENT FOR COMPENSATING MAGNETIC OWN FIELDS OF MOVABLE BODIES
DE3123493A1 (en) * 1981-06-13 1982-12-30 Bruker Analytische Meßtechnik GmbH, 7512 Rheinstetten ELECTROMAGNET FOR NMR TOMOGRAPHY
US4477777A (en) * 1981-06-19 1984-10-16 Oxford Research Systems Limited Analysis of biological material
GB2121545B (en) * 1982-06-09 1985-09-25 Picker Int Ltd Nuclear magnetic resonance method and apparatus
DE3245944A1 (en) * 1982-12-11 1984-06-14 Bruker Analytische Meßtechnik GmbH, 7512 Rheinstetten ELECTROMAGNET FOR NMR TOMOGRAPHY
FR2541551A1 (en) * 1983-02-21 1984-08-24 Drusch & Cie DEVICE FOR HOLDING AND FIXING COILS FOR REALIZING A CONSTANT AND HOMOGENEOUS MAGNETIC FIELD
US4685468A (en) * 1983-03-18 1987-08-11 Albert Macovski NMR imaging system using field compensation
JPS59200947A (en) * 1983-04-30 1984-11-14 Toshiba Corp Nuclear magnetic resonance video apparatus
IL72388A (en) * 1984-07-12 1988-07-31 Elscint Ltd Nmr imaging systems
US4523166A (en) * 1984-10-19 1985-06-11 General Electric Company Optimal field inhomogeneity correction coil operation for NMR magnets
US4724386A (en) * 1985-09-30 1988-02-09 Picker International, Inc. Centrally ordered phase encoding
US4716368A (en) * 1985-08-09 1987-12-29 Picker International, Inc. Magnetic resonance reconstruction and scanning techniques using known information, constraints, and symmetry relations
US4694837A (en) * 1985-08-09 1987-09-22 Picker International, Inc. Cardiac and respiratory gated magnetic resonance imaging
GB8808334D0 (en) * 1988-04-08 1988-05-11 Magnex Scient Ltd Electromagnets
DE4217496C2 (en) * 1992-05-27 1994-06-16 Bruker Analytische Messtechnik Shim method
JP3987686B2 (en) * 2001-02-02 2007-10-10 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 Static magnetic field correction method and MRI apparatus

Also Published As

Publication number Publication date
GB2027208A (en) 1980-02-13

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960618