DE3482339D1 - Vorrichtung und verfahren zur reduzierung von scheinstroemen, verursacht durch gepulste feldgradienten im nmr-abbildungsapparat. - Google Patents

Vorrichtung und verfahren zur reduzierung von scheinstroemen, verursacht durch gepulste feldgradienten im nmr-abbildungsapparat.

Info

Publication number
DE3482339D1
DE3482339D1 DE8484304652T DE3482339T DE3482339D1 DE 3482339 D1 DE3482339 D1 DE 3482339D1 DE 8484304652 T DE8484304652 T DE 8484304652T DE 3482339 T DE3482339 T DE 3482339T DE 3482339 D1 DE3482339 D1 DE 3482339D1
Authority
DE
Germany
Prior art keywords
imaging apparatus
field gradients
nmr imaging
pulse field
currents caused
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
Application number
DE8484304652T
Other languages
English (en)
Inventor
Lawrence E Crooks
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.)
University of California
University of California Berkeley
Original Assignee
University of California
University of California Berkeley
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 University of California, University of California Berkeley filed Critical University of California
Application granted granted Critical
Publication of DE3482339D1 publication Critical patent/DE3482339D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
    • 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
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3628—Tuning/matching of the transmit/receive coil
    • 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
    • G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
    • 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
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/42—Screening
    • G01R33/422—Screening of the radio frequency field
DE8484304652T 1983-07-19 1984-07-06 Vorrichtung und verfahren zur reduzierung von scheinstroemen, verursacht durch gepulste feldgradienten im nmr-abbildungsapparat. Expired - Lifetime DE3482339D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/515,116 US4607225A (en) 1983-07-19 1983-07-19 Apparatus and method for reducing spurious currents in NMR imaging apparatus induced by pulsed gradient fields

Publications (1)

Publication Number Publication Date
DE3482339D1 true DE3482339D1 (de) 1990-06-28

Family

ID=24050039

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484304652T Expired - Lifetime DE3482339D1 (de) 1983-07-19 1984-07-06 Vorrichtung und verfahren zur reduzierung von scheinstroemen, verursacht durch gepulste feldgradienten im nmr-abbildungsapparat.

Country Status (4)

Country Link
US (1) US4607225A (de)
EP (1) EP0132338B1 (de)
JP (1) JPS6085734A (de)
DE (1) DE3482339D1 (de)

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US4585995A (en) * 1984-04-19 1986-04-29 Technicare Corporation Nuclear magnetic resonance eddy field suppression apparatus
NL8402380A (nl) * 1984-07-30 1986-02-17 Philips Nv Kernspin resonantie apparaat met een zend-meetspoel voor hoge frequenties.
US4680548A (en) * 1984-10-09 1987-07-14 General Electric Company Radio frequency field coil for NMR
US4721915A (en) * 1985-03-06 1988-01-26 Siemens Aktiengesellschaft High frequency antenna system for nuclear magnetic resonance tomography devices
US4648405A (en) * 1985-04-30 1987-03-10 Elscint, Ltd. Body probes
US4866387A (en) * 1985-05-08 1989-09-12 Mcw Research Foundation, Inc. NMR detector network
US4724389A (en) * 1985-05-08 1988-02-09 Medical College Of Wisconsin, Inc. Loop-gap resonator for localized NMR imaging
FR2583172B1 (fr) * 1985-06-07 1987-11-20 Thomson Cgr Antenne haute frequence pour appareil mesurant la resonance magnetique nucleaire
DE3522401A1 (de) * 1985-06-22 1987-01-02 Bruker Medizintech Probenkopf fuer die nmr-tomographie
US4731584A (en) * 1985-08-14 1988-03-15 Picker International, Inc. Magnetic resonance probe for operation at frequencies above self resonance
US5045792A (en) * 1985-08-14 1991-09-03 Picker International, Inc. Split and non-circular magnetic resonance probes with optimum field uniformity
FR2590993B1 (fr) * 1985-11-29 1988-04-29 Thomson Cgr Dispositif et procede de reglage d'une antenne radiofrequence d'un appareil de resonance magnetique nucleaire
US4695801A (en) * 1986-02-10 1987-09-22 The Regents Of The University Of California Matched guadrature coils for MRI with minimized intercoil coupling
US4733189A (en) * 1986-06-03 1988-03-22 Massachusetts Institute Of Technology Magnetic resonance imaging systems
DE3732660A1 (de) * 1986-09-29 1988-04-07 Toshiba Kawasaki Kk Magnetresonanz-abbildungssystem
NL8701948A (nl) * 1987-08-19 1989-03-16 Philips Nv Magnetisch resonantie-apparaat met verbeterd gradient spoelenstelsel.
DE3900881C2 (de) * 1988-01-13 1994-02-03 Toshiba Kawasaki Kk Trimmspulen-Vorrichtung für eine NMR-Abbildungsvorrichtung
US4950994A (en) * 1988-03-07 1990-08-21 General Electric Company Gradient and polarizing field compensation
JPH02307830A (ja) * 1989-05-18 1990-12-21 Chisso Corp 石英ガラス粉末の製造方法
US5250902A (en) * 1991-12-19 1993-10-05 Varian Associates, Inc. Reduction of gradient coil interaction with room temperature shims
DE19511834A1 (de) * 1995-03-30 1996-10-02 Siemens Ag Diagnostisches Magnetresonanzgerät
DE102005033955A1 (de) * 2005-07-20 2007-02-01 Siemens Ag Magnetresonanzeinrichtung umfassend eine zylindrische Gradientenspule
US7535228B2 (en) * 2006-03-21 2009-05-19 Radiation Monitoring Devices, Inc. Sensor array for nuclear magnetic resonance imaging systems and method
US20100321032A1 (en) * 2008-01-09 2010-12-23 Kent Jeffrey Holce Pre-Settable Current Sensing Apparatus, System, and/or Method
US9500731B2 (en) * 2010-10-15 2016-11-22 Eleazar Castillo Shimming device and method to improve magnetic field homogeneity in magnetic resonance imaging devices
DE102011087485B3 (de) * 2011-11-30 2013-05-29 Siemens Aktiengesellschaft Magnetresonanztomographie-Anlage, Verfahren zum Ausgleichen einer Feldinhomogenität in der Anlage und Shimspulenanordnung
GB2504769B (en) * 2012-08-10 2017-05-17 Siemens Healthcare Ltd Methods and apparatus for shimming a superconducting magnet

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US2686270A (en) * 1948-12-30 1954-08-10 Rca Corp Electrical input circuit with noise reducing means
US3469180A (en) * 1960-12-19 1969-09-23 Varian Associates Apparatus for improving the homogeneity of a magnetic field
US3434043A (en) * 1966-02-14 1969-03-18 Varian Associates Nuclear magnetic resonance probe apparatus having double tuned coil systems for spectrometers employing an internal reference
CH540528A (de) * 1970-10-13 1973-08-15 Spectrospin Ag Vorrichtung zur Erzeugung eines Magnetfeldes mittels einer oder mehreren Spulen und zur Konstanthaltung des erzeugten Magnetfeldes
US4021726A (en) * 1974-09-11 1977-05-03 National Research Development Corporation Image formation using nuclear magnetic resonance
US4075552A (en) * 1975-04-24 1978-02-21 Traficante Daniel D Wide-band nuclear magnetic resonance spectrometer
GB1518541A (en) * 1975-05-14 1978-07-19 Perkin Elmer Ltd Nuclear magnetic resonance
US4297637A (en) * 1978-07-20 1981-10-27 The Regents Of The University Of California Method and apparatus for mapping lines of nuclear density within an object using nuclear magnetic resonance
GB2050062B (en) * 1979-05-25 1983-07-20 Emi Ltd Coils for electromagnets with uniform fields
JPS57180947A (en) * 1981-04-30 1982-11-08 Tokyo Shibaura Electric Co Diagnostic nuclear magnetic resonance apparatus
DE3123493A1 (de) * 1981-06-13 1982-12-30 Bruker Analytische Meßtechnik GmbH, 7512 Rheinstetten Elektromagnet fuer die nmr-tomographie
DE3133432A1 (de) * 1981-08-24 1983-03-03 Siemens AG, 1000 Berlin und 8000 München Hochfrequenzfeld-einrichtung in einer kernspinresonanz-apparatur

Also Published As

Publication number Publication date
JPS6085734A (ja) 1985-05-15
US4607225A (en) 1986-08-19
EP0132338A2 (de) 1985-01-30
EP0132338B1 (de) 1990-05-23
JPH0417655B2 (de) 1992-03-26
EP0132338A3 (en) 1986-12-30

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