IL89279A - Gradient and polarizing field compensation - Google Patents

Gradient and polarizing field compensation

Info

Publication number
IL89279A
IL89279A IL89279A IL8927989A IL89279A IL 89279 A IL89279 A IL 89279A IL 89279 A IL89279 A IL 89279A IL 8927989 A IL8927989 A IL 8927989A IL 89279 A IL89279 A IL 89279A
Authority
IL
Israel
Prior art keywords
gradient
field compensation
polarizing field
polarizing
compensation
Prior art date
Application number
IL89279A
Other languages
English (en)
Other versions
IL89279A0 (en
Original Assignee
Gen Electric
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 Gen Electric filed Critical Gen Electric
Publication of IL89279A0 publication Critical patent/IL89279A0/xx
Publication of IL89279A publication Critical patent/IL89279A/xx

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
    • G01R33/38—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

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
IL89279A 1988-03-07 1989-02-14 Gradient and polarizing field compensation IL89279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/164,687 US4950994A (en) 1988-03-07 1988-03-07 Gradient and polarizing field compensation

Publications (2)

Publication Number Publication Date
IL89279A0 IL89279A0 (en) 1989-09-10
IL89279A true IL89279A (en) 1992-03-29

Family

ID=22595623

Family Applications (1)

Application Number Title Priority Date Filing Date
IL89279A IL89279A (en) 1988-03-07 1989-02-14 Gradient and polarizing field compensation

Country Status (6)

Country Link
US (1) US4950994A (xx)
EP (1) EP0332383B1 (xx)
JP (1) JPH027940A (xx)
CA (1) CA1304126C (xx)
DE (1) DE68924611T2 (xx)
IL (1) IL89279A (xx)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2628839B1 (fr) * 1988-03-18 1991-08-16 Thomson Cgr Procede de mesure des effets des courants de foucault
NL8802212A (nl) * 1988-09-08 1990-04-02 Philips Nv Werkwijze en inrichting voor wervelstroomcompensatie in mr apparaten.
JPH02264636A (ja) * 1988-12-23 1990-10-29 Picker Internatl Ltd 核磁気共鳴方法
US4920316A (en) * 1989-03-30 1990-04-24 Siemens Medical Systems, Inc. Method and apparatus for reducing base field shifts in a magnetic resonance device due to pulsed magnetic field gradients
US5371465A (en) * 1991-03-13 1994-12-06 Hitachi, Ltd. Inspection method and apparatus using nuclear magnetic resonance (NMR)
US5289129A (en) * 1992-10-13 1994-02-22 The Trustees Of The University Of Pennsylvania Multiple winding MRI gradient coil
DE4419061C2 (de) * 1994-05-31 1997-04-30 Siemens Ag Anordnung zur Messung und Regelung des Grundfeldes eines Magneten eines Kernspintomographiegerätes
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
US5998996A (en) * 1997-03-27 1999-12-07 General Electric Company Correction of artifacts caused by Maxwell terms in phase contrast 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
US6211675B1 (en) * 1998-11-12 2001-04-03 General Electric Company Automatic measurement of gradient field distortion
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
JP2002159463A (ja) * 2000-11-15 2002-06-04 Ge Medical Systems Global Technology Co Llc Ｍｒｉ装置の磁界変動測定方法、磁界変動補償方法およびｍｒｉ装置
US6342787B1 (en) * 2000-11-22 2002-01-29 Philips Medical Systems (Cleveland) Real-time multi-axis gradient distortion correction using an interactive shim set
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
US7906950B2 (en) * 2008-11-13 2011-03-15 International Business Machines Corporation Tuning a switching power supply
JP5971683B2 (ja) * 2011-03-15 2016-08-17 東芝メディカルシステムズ株式会社 磁気共鳴イメージング装置
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
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
JP6195613B2 (ja) * 2012-05-24 2017-09-13 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． リード情報を使用する心電図からのｍｒｉ干渉の減少
KR101442619B1 (ko) * 2012-11-26 2014-09-22 삼성전자주식회사 Ｍｒｉ 시스템 및 ｍｒｉ 시스템 진단 방법
KR101734998B1 (ko) * 2015-08-31 2017-05-12 삼성전자주식회사 자기공명영상장치 및 그 제어방법
US10254362B2 (en) * 2015-10-30 2019-04-09 General Electric Company Magnetic resonance imaging matrix shim coil system and method
DE102015222114A1 (de) 2015-11-10 2017-05-11 Siemens Healthcare Gmbh Verfahren zum Ansteuern einer Shimeinheit, Steuereinheit und Magnetresonanzgerät
CN109946632B (zh) * 2019-03-06 2023-10-20 佛山瑞加图医疗科技有限公司 剩磁相位差测量方法及剩磁测量方法
EP4152038A1 (de) * 2021-09-15 2023-03-22 Siemens Healthcare GmbH Verfahren, vorrichtungen und system zur korrektur einer wirkung eines störeffekts auf ein gradientensystem

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607225A (en) * 1983-07-19 1986-08-19 Regents Of The University Of California Apparatus and method for reducing spurious currents in NMR imaging apparatus induced by pulsed gradient fields
US4585995A (en) * 1984-04-19 1986-04-29 Technicare Corporation Nuclear magnetic resonance eddy field suppression apparatus
JPS61269052A (ja) * 1985-05-24 1986-11-28 Hitachi Ltd 核磁気共鳴を用いた検査方法
US4761612A (en) * 1985-07-25 1988-08-02 Picker International, Inc. Programmable eddy current correction
US4703275A (en) * 1985-07-25 1987-10-27 Picker International, Inc. Method and apparatus to compensate for eddy currents in magnetic resonance imaging
US4680551A (en) * 1985-10-07 1987-07-14 General Electric Company Method for homogenizing a static magnetic field over an arbitrary volume
US4698591A (en) * 1986-01-03 1987-10-06 General Electric Company Method for magnetic field gradient eddy current compensation
EP0250718A1 (de) * 1986-06-30 1988-01-07 Siemens Aktiengesellschaft Stromversorgung für einen induktiven Verbraucher, insbesondere eine Gradientenspule, mit Steuer- und Regeleinrichtung
JP2547745B2 (ja) * 1986-09-30 1996-10-23 株式会社東芝 磁気共鳴イメ−ジング装置
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

Also Published As

Publication number Publication date
IL89279A0 (en) 1989-09-10
JPH027940A (ja) 1990-01-11
EP0332383B1 (en) 1995-10-25
US4950994A (en) 1990-08-21
JPH0418855B2 (xx) 1992-03-27
EP0332383A2 (en) 1989-09-13
EP0332383A3 (en) 1990-11-28
DE68924611T2 (de) 1996-06-05
CA1304126C (en) 1992-06-23
DE68924611D1 (de) 1995-11-30

Similar Documents

Publication Publication Date Title
EP0332383A3 (en) Gradient and polarizing field compensation
EP0383932A4 (en) Visible polarizing film
EP0407830A3 (en) Polarizer
GB2220319B (en) Improvements in or relating to image stabilisation
HK1015179A1 (en) Optical element and system
IL87965A0 (en) Balanced self-shielded gradient coils
EP0322714A3 (en) Polarizing optical element and device using the same
IL81778A (en) Single crystal articles having reduced anisotropy
GB2225431B (en) Improvements in magnetic resonance measurement
EP0348964A3 (en) Polarizing film
EP0353057A3 (en) Optical component and magnetic-field sensor using superposed single crystal elements having different optical properties
KR970002633B1 (en) Benzazepine and benzothiazephine derivatives
RO105577B1 (ro) Compozitie poliolefinica plastomerica si procedeu de obtinere a acesteia
EP0253144A3 (en) Polarizing film
GB8907679D0 (en) Analyzer with compensation
GB2215471B (en) Superconducting magnet
EP0338575A3 (en) Birefringent transparent film and process for producing the same
EP0330500A3 (en) Magneto-optic garnet
EP0517174A3 (en) Lfa-3 protein and derivatives
EP0311329A3 (en) Optically active-1-(2-halogen-substituted-phenyl)-ethanols and derivatives thereof
EP0285397A3 (en) Cube corner polarizer
EP0305978A3 (en) Magnetoelectric element and magnetoelectric apparatus
EP0546563A3 (en) Complex crystal
AR245119A1 (es) Procedimiento para preparar un grupo de fenilalquiltiofenos que estan sustituidos adicionalmente con un grupo acido tiadicarboxilico.
ZA891447B (en) Substituted imidazolinones and imidazolinethiones

Legal Events

Date Code Title Description
KB Patent renewed
RH1 Patent not in force