DE3685947T2 - Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes. - Google Patents

Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes.

Info

Publication number
DE3685947T2
DE3685947T2 DE8686117802T DE3685947T DE3685947T2 DE 3685947 T2 DE3685947 T2 DE 3685947T2 DE 8686117802 T DE8686117802 T DE 8686117802T DE 3685947 T DE3685947 T DE 3685947T DE 3685947 T2 DE3685947 T2 DE 3685947T2
Authority
DE
Germany
Prior art keywords
compensating
magnetic field
gradient magnetic
swirl current
swirl
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
DE8686117802T
Other languages
English (en)
Other versions
DE3685947D1 (de
Inventor
Gary Harold Glover
Norbert Joseph Pelc
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of DE3685947D1 publication Critical patent/DE3685947D1/de
Publication of DE3685947T2 publication Critical patent/DE3685947T2/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
    • G01R33/44—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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
DE8686117802T 1986-01-03 1986-12-19 Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes. Expired - Lifetime DE3685947T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/816,074 US4698591A (en) 1986-01-03 1986-01-03 Method for magnetic field gradient eddy current compensation

Publications (2)

Publication Number Publication Date
DE3685947D1 DE3685947D1 (de) 1992-08-13
DE3685947T2 true DE3685947T2 (de) 1993-02-18

Family

ID=25219612

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686117802T Expired - Lifetime DE3685947T2 (de) 1986-01-03 1986-12-19 Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes.

Country Status (4)

Country Link
US (1) US4698591A (de)
EP (1) EP0228056B1 (de)
JP (1) JPS62189057A (de)
DE (1) DE3685947T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032345A1 (de) * 2000-07-04 2002-01-31 Bruker Medical Gmbh Verfahren zum Korrigieren von Störeinflüssen auf die MR-Signale einer im Messvolumen einer MR-Apparatur angeordneten Substanz
CN107076818A (zh) * 2014-09-12 2017-08-18 皇家飞利浦有限公司 零回波时间mr成像
EP4016108A1 (de) * 2020-12-16 2022-06-22 Siemens Healthcare GmbH Verfahren zum erzeugen einer charakterisierungsfunktion für ein gradientensystem einer magnetresonanzanlage

Families Citing this family (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4761612A (en) * 1985-07-25 1988-08-02 Picker International, Inc. Programmable eddy current correction
JPS63105751A (ja) * 1986-10-22 1988-05-11 横河メディカルシステム株式会社 勾配磁場応答補正方法
JPS63135146A (ja) * 1986-11-28 1988-06-07 横河メディカルシステム株式会社 勾配磁場応答測定方法
NL8701948A (nl) * 1987-08-19 1989-03-16 Philips Nv Magnetisch resonantie-apparaat met verbeterd gradient spoelenstelsel.
DE3730148A1 (de) * 1987-09-09 1989-03-30 Bruker Medizintech Verfahren zum erzeugen von spin-echo-impulsfolgen mit einem kernspin-tomographen und zur durchfuehrung des verfahrens ausgebildeter kernspin-tomograph
EP0307516A1 (de) * 1987-09-18 1989-03-22 Koninklijke Philips Electronics N.V. Magnetresonanzabbildungsgerät mit Korrektionssystem für Wirbelströmeeffekte
US4797615A (en) * 1987-09-30 1989-01-10 Elscint Ltd. Determining and correcting for phase jumps
JP2642362B2 (ja) * 1987-09-30 1997-08-20 株式会社東芝 磁気共鳴映像装置
US4928063A (en) * 1987-11-09 1990-05-22 Picker International, Inc. Automatic eddy current correction
US4950994A (en) * 1988-03-07 1990-08-21 General Electric Company Gradient and polarizing field compensation
FR2628839B1 (fr) * 1988-03-18 1991-08-16 Thomson Cgr Procede de mesure des effets des courants de foucault
US4885542A (en) * 1988-04-14 1989-12-05 The Regents Of The University Of California MRI compensated for spurious NMR frequency/phase shifts caused by spurious changes in magnetic fields during NMR data measurement processes
NL8802212A (nl) * 1988-09-08 1990-04-02 Philips Nv Werkwijze en inrichting voor wervelstroomcompensatie in mr apparaten.
WO1990002513A1 (en) * 1988-09-16 1990-03-22 Noise Cancellation Technologies, Inc. Active attenuation system for medical patients
US4881032A (en) * 1988-10-21 1989-11-14 General Electric Company Method of, and apparatus for, NMR spectroscopic metabolite imaging and quantification
JPH02264636A (ja) * 1988-12-23 1990-10-29 Picker Internatl Ltd 核磁気共鳴方法
US4978919A (en) * 1989-04-27 1990-12-18 Picker International, Inc. Measurement and calibration of eddy currents for magnetic resonance imagers
US4965521A (en) * 1989-08-11 1990-10-23 Spectroscopy Imaging Systems Method and apparatus for compensating eddy current effects in a magnetic resonance device having pulsed magnetic field gradients
US5313945A (en) * 1989-09-18 1994-05-24 Noise Cancellation Technologies, Inc. Active attenuation system for medical patients
JPH03173531A (ja) * 1989-12-01 1991-07-26 Hitachi Ltd 磁気共鳴イメージング装置の渦電流補償方法及び渦電流補償装置
DE69329873T2 (de) * 1992-10-26 2001-09-13 Koninkl Philips Electronics Nv Kompensierung von Wirbelströmen in der Bilderzeugung mittels magnetischer Resonanz
DE4313392C2 (de) * 1993-04-23 1995-06-22 Siemens Ag Verfahren zur Kompensation von durch Gradienten verursachten Wirbelströmen bei Kernspinresonanzgeräten
US5349296A (en) * 1993-07-09 1994-09-20 Picker International, Inc. Magnetic resonance scan sequencer
DE4325031C1 (de) * 1993-07-26 1994-11-03 Siemens Ag Verfahren zur Erfassung von durch Gradienten verursachten Wirbelstrom-Magnetfeldern in einem Kernspinresonanzgerät
US5929638A (en) * 1996-08-07 1999-07-27 U.S. Philips Corporation MR method and device for carrying out the method
US5770943A (en) * 1996-12-30 1998-06-23 General Electric Company Method for measuring and compensating for spatially and temporally varying magnetic fields induced by eddy currents
US5864233A (en) * 1997-02-22 1999-01-26 General Electric Company Method to reduce eddy current effects in diffusion-weighted echo planar imaging
US5998996A (en) * 1997-03-27 1999-12-07 General Electric Company Correction of artifacts caused by Maxwell terms in phase contrast angiography
US5891032A (en) * 1997-04-10 1999-04-06 Elscint Ltd Fat free TOF angiography
US6066949A (en) * 1997-11-19 2000-05-23 The Board Of Trustees Of The Leland Stanford Junior University Gradient characterization using fourier-transform
DE19753093A1 (de) * 1997-11-29 1999-06-02 Philips Patentverwaltung MR-Verfahren
US6025715A (en) * 1997-12-15 2000-02-15 King; Kevin F. Method for compensating an MRI system for time dependent gradient field distortion
US6175236B1 (en) 1998-03-25 2001-01-16 General Electric Company Method for acquiring spatially and spectrally selective MR images
US6154030A (en) * 1998-03-30 2000-11-28 Varian, Inc. Digital eddy current compensation
US6211675B1 (en) 1998-11-12 2001-04-03 General Electric Company Automatic measurement of gradient field distortion
US6043656A (en) * 1998-11-23 2000-03-28 General Electric Company Method for compensating an MRI system for residual magnetization
DE19859501C1 (de) * 1998-12-22 2000-06-15 Siemens Ag Verfahren zur Erfassung von Wirbelströmen, die durch geschaltete Magnetfeldgradienten eines Kernspinresonanzgerätes verursacht werden und die Kreuzterme enthalten
US6127826A (en) * 1999-01-27 2000-10-03 Picker International, Inc. EPI image based long term eddy current pre-emphasis calibration
US6369568B1 (en) 1999-06-03 2002-04-09 Ge Medical Systems Global Technology Company, Llc Fast spin echo phase correction for MRI system
US6191582B1 (en) 1999-07-21 2001-02-20 General Electric Company Eddy current compensation
US6329821B1 (en) 1999-11-15 2001-12-11 Ge Medical Systems Global Technology Company, Llc Method and apparatus to compensate for image artifacts caused by magnet vibration in an MR imaging system
US6380738B1 (en) 1999-11-15 2002-04-30 Ge Medical Systems Global Technology Company, Llc Method and apparatus for reducing image artifacts caused by magnet vibration in an MR imaging system
US6294913B1 (en) 1999-11-22 2001-09-25 Ge Medical Systems Global Technology Company Llc Compensation of variations in polarizing magnetic field during magnetic resonance imaging
US6448773B1 (en) 2000-02-24 2002-09-10 Toshiba America Mri, Inc. Method and system for measuring and compensating for eddy currents induced during NMR imaging operations
US6507190B1 (en) 2000-08-01 2003-01-14 Ge Medical Systems Global Technologies Company Llc Method and apparatus for compensating polarizing fields in magnetic resonance imaging
US6566877B1 (en) * 2000-12-26 2003-05-20 Koninklijke Philips Electronics, N.V. Band-limited gradient waveforms
DE10216493A1 (de) * 2002-04-13 2003-10-30 Univ Leipzig Verfahren zur Steuerung von Verstärkern mit induktiven Lasten
ITSV20020030A1 (it) * 2002-07-01 2004-01-02 Esaote Spa Metodo di compensazione di correnti parassite causate da gradienti nelle macchine per il rilevametno d'immagini in risonanza magnetica nucle
JP4106053B2 (ja) * 2002-07-04 2008-06-25 株式会社日立メディコ 磁気共鳴イメージング装置及び渦電流補償導出方法
EP1592978A1 (de) * 2003-02-05 2005-11-09 Koninklijke Philips Electronics N.V. Kompensation vonmagnetfeldstörungen aufgrund von vibrationen in einem mri-system
DE10306017A1 (de) * 2003-02-13 2004-09-09 Siemens Ag Verfahren zum Ermitteln einer Kompensationseinstellung für ein Wirbelstromfeld
US7783441B2 (en) * 2003-04-17 2010-08-24 Northern Digital Inc. Eddy current detection and compensation
US7112965B2 (en) * 2004-04-30 2006-09-26 University Of Basel Low-impact noise acquisition magnetic resonance imaging
DE102006001194B4 (de) * 2006-01-10 2008-12-11 Bruker Biospin Gmbh Verfahren zur Ansteuerung eines Netzgeräts einer Magnetspule mittels automatischer digitaler Preemphasis für dynamische NMR-Magnetfelder durch digitale IIR-Filter
US8239992B2 (en) 2007-05-09 2012-08-14 Irobot Corporation Compact autonomous coverage robot
US7847545B2 (en) * 2008-04-11 2010-12-07 General Electric Company System and method for correcting flow velocity measurements in phase contrast imaging using magnetic field monitoring
JP5332016B2 (ja) * 2009-04-27 2013-11-06 株式会社 Ｊｅｏｌ Ｒｅｓｏｎａｎｃｅ スピン磁気共鳴装置および方法
JP5121773B2 (ja) * 2009-05-11 2013-01-16 株式会社東芝 磁気共鳴イメージング装置
JP4959759B2 (ja) * 2009-08-12 2012-06-27 アイロボット コーポレイション デブリセンサ及び清浄装置を操作する方法
JP5836931B2 (ja) 2010-03-26 2015-12-24 テルモ株式会社 留置針組立体
JP6038654B2 (ja) * 2010-08-26 2016-12-07 株式会社日立製作所 磁気共鳴イメージング装置及び振動誤差磁場低減方法
ES2770548T3 (es) 2010-12-30 2020-07-02 Irobot Corp Monitorización de residuos
US9829554B2 (en) 2011-03-29 2017-11-28 University Of New Brunswick Magnetic field gradient monitor and magnetic field gradient waveform correction apparatus and methods
US8942945B2 (en) 2011-04-19 2015-01-27 General Electric Company System and method for prospective correction of high order eddy-current-induced distortion in diffusion-weighted echo planar imaging
CN102298129B (zh) * 2011-05-30 2014-07-09 苏州朗润医疗系统有限公司 一种用于核磁共振成像系统的涡流测量及补偿方法
US9322892B2 (en) 2011-12-20 2016-04-26 General Electric Company System for magnetic field distortion compensation and method of making same
US9279871B2 (en) 2011-12-20 2016-03-08 General Electric Company System and apparatus for compensating for magnetic field distortion in an MRI system
US9274188B2 (en) 2012-11-30 2016-03-01 General Electric Company System and apparatus for compensating for magnetic field distortion in an MRI system
US9709653B2 (en) 2013-02-19 2017-07-18 Toshiba Medical Systems Corporation Mapping eddy current fields in MRI system
US10254362B2 (en) 2015-10-30 2019-04-09 General Electric Company Magnetic resonance imaging matrix shim coil system and method
DE102018200239B4 (de) 2018-01-09 2022-09-22 Siemens Healthcare Gmbh Verfahren und Magnetresonanzanlage zur Artefaktvermeidung un-ter Bestimmung von einer von Wirbelströmen hervorgerufenen Phasendifferenz für eine Magnetresonanzanlage
DE102019209079A1 (de) 2019-06-24 2020-12-24 Siemens Healthcare Gmbh Verfahren zur Vermessung von Wirbelstromfeldern in einer Magnetresonanzeinrichtung, Magnetresonanzeinrichtung, Computerprogramm und elektronisch lesbarer Datenträger
US20220206096A1 (en) * 2020-12-25 2022-06-30 Canon Medical Systems Corporation Signal processing apparatus, magnetic resonance imaging apparatus, and signal processing method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3245945A1 (de) * 1982-12-11 1984-06-14 Bruker Analytische Meßtechnik GmbH, 7512 Rheinstetten Elektromagnet fuer die nmr-tomographie
GB8402360D0 (en) * 1984-01-30 1984-02-29 Picker Int Ltd Nmr shims
US4585995A (en) * 1984-04-19 1986-04-29 Technicare Corporation Nuclear magnetic resonance eddy field suppression apparatus
JPS60222043A (ja) * 1984-04-20 1985-11-06 横河電機株式会社 核磁気共鳴による診断装置
JPS62152444A (ja) * 1985-12-27 1987-07-07 株式会社東芝 磁気共鳴イメ−ジング装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032345A1 (de) * 2000-07-04 2002-01-31 Bruker Medical Gmbh Verfahren zum Korrigieren von Störeinflüssen auf die MR-Signale einer im Messvolumen einer MR-Apparatur angeordneten Substanz
CN107076818A (zh) * 2014-09-12 2017-08-18 皇家飞利浦有限公司 零回波时间mr成像
CN107076818B (zh) * 2014-09-12 2019-11-05 皇家飞利浦有限公司 零回波时间mr成像
EP4016108A1 (de) * 2020-12-16 2022-06-22 Siemens Healthcare GmbH Verfahren zum erzeugen einer charakterisierungsfunktion für ein gradientensystem einer magnetresonanzanlage

Also Published As

Publication number Publication date
EP0228056A3 (en) 1989-07-26
EP0228056A2 (de) 1987-07-08
EP0228056B1 (de) 1992-07-08
JPS62189057A (ja) 1987-08-18
DE3685947D1 (de) 1992-08-13
JPH0349453B2 (de) 1991-07-29
US4698591A (en) 1987-10-06

Similar Documents

Publication Publication Date Title
DE3685947D1 (de) Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes.
DE3578714D1 (de) Verfahren zum messen der magnetischen kernresonanz.
DE3871877T2 (de) Verfahren zum anbringen eines orthodontischen hilfsstuecks.
DE3675292D1 (de) Verfahren zum betrieb eines kernspinresonanzgeraetes.
DE3850416T2 (de) Anordnung zur Erzeugung eines magnetischen Feldes.
DE3850559T2 (de) Vorrichtung zum schnellen Ausserbetriebsetzen einer Feldspule der magnetischen Kernresonanz.
GB2125632B (en) Improved method for superconducting magnet shimming
DE3768371D1 (de) Vorrichtung zum kompensieren von zeitvarianten feldstoerungen in magnetfeldern.
DE3575232D1 (de) Verfahren zur herstellung eines permanentmagneten.
DE3680236D1 (de) Magnetkopf und verfahren zu dessen herstellung.
DE3675167D1 (de) Verfahren zum ansteuern eines elektromagneten.
DE69121095D1 (de) Vorrichtung zum erzeugen von magnetfeldern
DE3685259D1 (de) Verfahren zur bilderzeugung mittels magnetischer resonanz.
DE3671002D1 (de) Verfahren zur herstellung von magnetitpigmenten.
DE3667331D1 (de) Verfahren und vorrichtung zum homogenisieren des feldes einer magnetspule.
DE69126963T2 (de) Vorrichtung zum erzeugen von magnetfeldern
DE3881432T2 (de) Verfahren zum Erzeugen eines Kernspinresonanzsignals von einer sich bewegenden Flüssigkeit.
DE3689967D1 (de) Verfahren zum herstellen eines multipolaren magnets.
DE3772616D1 (de) Spulenanordnung zum korrigieren eines magnetfeldes.
DE69121094T2 (de) Vorrichtung zum erzeugen von magnetfeldern
DE3768702D1 (de) Verfahren zur einstellung von homogenitaetskorrekturwindungen des magnetfeldes eines magnetes.
DE3681242D1 (de) Verfahren und apparatur zur kernmagnetischen resonanz.
DE3575035D1 (de) Magnetaufzeichnungstraeger und verfahren zu seiner herstellung.
DE3582923D1 (de) Verfahren zur herstellung von isometrischen magnetischen eisenoxidpigmenten.
DE3786245D1 (de) Verfahren zur herstellung eines magnetischen duennen polstuecks.

Legal Events

Date Code Title Description
8320 Willingness to grant licences declared (paragraph 23)
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Representative=s name: ROEGER UND KOLLEGEN, 73728 ESSLINGEN