DE3685947D1 - Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes. - Google Patents

Verfahren zum ausgleich des wirbelstromes eines gradientenmagnetfeldes.

Info

Publication number
DE3685947D1
DE3685947D1 DE8686117802T DE3685947T DE3685947D1 DE 3685947 D1 DE3685947 D1 DE 3685947D1 DE 8686117802 T DE8686117802 T DE 8686117802T DE 3685947 T DE3685947 T DE 3685947T DE 3685947 D1 DE3685947 D1 DE 3685947D1
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
DE3685947T2 (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
Publication of DE3685947D1 publication Critical patent/DE3685947D1/de
Application granted granted Critical
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 true DE3685947D1 (de) 1992-08-13
DE3685947T2 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)

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US5891032A (en) * 1997-04-10 1999-04-06 Elscint Ltd Fat free TOF angiography
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DE19753093A1 (de) * 1997-11-29 1999-06-02 Philips Patentverwaltung MR-Verfahren
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US6154030A (en) * 1998-03-30 2000-11-28 Varian, Inc. Digital eddy current compensation
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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
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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
WO2004004563A1 (ja) * 2002-07-04 2004-01-15 Hitachi Medical Corporation 磁気共鳴イメージング装置
US7372265B2 (en) * 2003-02-05 2008-05-13 Koninklijke Philips Electronics N.V. Compensation of magnetic field disturbances due to vibrations in an 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
KR101168481B1 (ko) 2007-05-09 2012-07-26 아이로보트 코퍼레이션 자동 커버리지 로봇
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
US9453897B2 (en) * 2010-08-26 2016-09-27 Hitachi Medical Corporation Magnetic resonance imaging apparatus and vibrational error magnetic field reduction method
CN103443612B (zh) 2010-12-30 2016-04-20 美国iRobot公司 碎屑监视
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
US9279871B2 (en) 2011-12-20 2016-03-08 General Electric Company System and apparatus for compensating for magnetic field distortion in an MRI system
US9322892B2 (en) 2011-12-20 2016-04-26 General Electric Company System for magnetic field distortion compensation and method of making same
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
EP3191862B1 (de) * 2014-09-12 2021-05-12 Koninklijke Philips N.V. Magnetresonanzbildgebung mit null-echozeit
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
EP4016108A1 (de) * 2020-12-16 2022-06-22 Siemens Healthcare GmbH Verfahren zum erzeugen einer charakterisierungsfunktion für ein gradientensystem einer magnetresonanzanlage
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GB8402360D0 (en) * 1984-01-30 1984-02-29 Picker Int Ltd Nmr shims
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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

Also Published As

Publication number Publication date
EP0228056A3 (en) 1989-07-26
JPS62189057A (ja) 1987-08-18
EP0228056B1 (de) 1992-07-08
DE3685947T2 (de) 1993-02-18
JPH0349453B2 (de) 1991-07-29
EP0228056A2 (de) 1987-07-08
US4698591A (en) 1987-10-06

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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