DE68924611T2 - Kompensation eines Polarisations- und Gradientenfeldes. - Google Patents
Kompensation eines Polarisations- und Gradientenfeldes.Info
- Publication number
- DE68924611T2 DE68924611T2 DE68924611T DE68924611T DE68924611T2 DE 68924611 T2 DE68924611 T2 DE 68924611T2 DE 68924611 T DE68924611 T DE 68924611T DE 68924611 T DE68924611 T DE 68924611T DE 68924611 T2 DE68924611 T2 DE 68924611T2
- Authority
- DE
- Germany
- Prior art keywords
- polarization
- compensation
- gradient field
- gradient
- field
- 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
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)
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 |
---|---|
DE68924611D1 DE68924611D1 (de) | 1995-11-30 |
DE68924611T2 true DE68924611T2 (de) | 1996-06-05 |
Family
ID=22595623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE68924611T Expired - Lifetime DE68924611T2 (de) | 1988-03-07 | 1989-03-06 | Kompensation eines Polarisations- und Gradientenfeldes. |
Country Status (6)
Country | Link |
---|---|
US (1) | US4950994A (de) |
EP (1) | EP0332383B1 (de) |
JP (1) | JPH027940A (de) |
CA (1) | CA1304126C (de) |
DE (1) | DE68924611T2 (de) |
IL (1) | IL89279A (de) |
Families Citing this family (27)
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 |
EP2854630B1 (de) * | 2012-05-24 | 2017-07-12 | Koninklijke Philips N.V. | Reduktion von mri-interferenzen aus einem elektrokardiogramm anhand von elektrodeninformationen |
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 |
Family Cites Families (10)
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 |
US4703275A (en) * | 1985-07-25 | 1987-10-27 | Picker International, Inc. | Method and apparatus to compensate for eddy currents in magnetic resonance imaging |
US4761612A (en) * | 1985-07-25 | 1988-08-02 | Picker International, Inc. | Programmable eddy current correction |
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 |
-
1988
- 1988-03-07 US US07/164,687 patent/US4950994A/en not_active Expired - Lifetime
-
1989
- 1989-02-09 CA CA000590577A patent/CA1304126C/en not_active Expired - Fee Related
- 1989-02-14 IL IL89279A patent/IL89279A/xx not_active IP Right Cessation
- 1989-03-06 EP EP89302236A patent/EP0332383B1/de not_active Expired - Lifetime
- 1989-03-06 DE DE68924611T patent/DE68924611T2/de not_active Expired - Lifetime
- 1989-03-07 JP JP1053086A patent/JPH027940A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
DE68924611D1 (de) | 1995-11-30 |
JPH027940A (ja) | 1990-01-11 |
EP0332383B1 (de) | 1995-10-25 |
CA1304126C (en) | 1992-06-23 |
JPH0418855B2 (de) | 1992-03-27 |
IL89279A0 (en) | 1989-09-10 |
US4950994A (en) | 1990-08-21 |
EP0332383A2 (de) | 1989-09-13 |
EP0332383A3 (en) | 1990-11-28 |
IL89279A (en) | 1992-03-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE68924611T2 (de) | Kompensation eines Polarisations- und Gradientenfeldes. | |
DE59010516D1 (de) | Polarisator | |
NO177325C (no) | Brönnbehandlingsvæske og tilsetningsmiddel | |
FR2617933B1 (fr) | Dispositif d'isolement anti-vibratoire et antichocs | |
EP0573372A3 (en) | Thin film very high sensitivity magnetoresistive magnetometer having temperature compensation and single domain stability | |
DE68913879T2 (de) | Kernspinresonanzgerät. | |
DK239490D0 (da) | Kontrastmidler til magnetisk resonansafbildning | |
DE69029933T2 (de) | Abtast- und Halte-Schaltungsanordnung | |
ES2017015B3 (es) | Procedimiento de preparacion de disulfuros y polisulfuros organicos | |
FI95968C (fi) | Laminoituja polarisaattoreita | |
DE69031856D1 (de) | Kompensation von lithographischen und Ätznäheeffekten | |
DE69027005T2 (de) | Eine supraleitende Dünnschicht | |
NO870927D0 (no) | Fremgangsmaate og anordning for aa redusere magnetiske stroefelt. | |
DK92790D0 (da) | Stoebe- og maaleanlaeg | |
FI896091A0 (fi) | Korkeatoimiset polarisaattorit | |
DE69127917T2 (de) | Hochempfindliches Magnetometer | |
NO892269L (no) | Ikke-hyperglykosylerte hepatitt b-virus-proteiner samt ekspresjons-"kassetter" og fremgangsmaate for fremstilling avproteinene. | |
DK501989D0 (da) | Mikrobiocidt praeparat og dettes fremstilling | |
DE68927602D1 (de) | Magnetresonanz-Gerät | |
DE3762175D1 (de) | Homogenitaetskorrektureinheit eines magnetfeldes und mit solchen einheiten ausgeruesteter magnet. | |
DE68915557D1 (de) | Anordnung eines Abstandshalters. | |
DK354789D0 (da) | Alkenyltetrazolderivater samt fremgangsmaade til fremstilling deraf | |
DK403889D0 (da) | Benzazolderivater samt deres fremstilling og anvendelse | |
DK619589A (da) | Sphingenin og derivater heraf | |
DK253088A (da) | Rundstraalende magnestatisk hoejttaler |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |