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
- magnetic field
- gradient
- pulse
- polarizing
- 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
- 230000010287 polarization Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 15
- 230000005284 excitation Effects 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000006870 function Effects 0.000 description 19
- 230000004044 response Effects 0.000 description 19
- 238000005259 measurement Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 6
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000002592 echocardiography Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012885 constant function Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000003121 nonmonotonic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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 (cg-RX-API-DMAC7.html) |
| EP (1) | EP0332383B1 (cg-RX-API-DMAC7.html) |
| JP (1) | JPH027940A (cg-RX-API-DMAC7.html) |
| CA (1) | CA1304126C (cg-RX-API-DMAC7.html) |
| DE (1) | DE68924611T2 (cg-RX-API-DMAC7.html) |
| IL (1) | IL89279A (cg-RX-API-DMAC7.html) |
Families Citing this family (29)
| 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 |
| EP4152038B1 (de) * | 2021-09-15 | 2025-07-02 | Siemens Healthineers AG | Verfahren, vorrichtungen und system zur korrektur einer wirkung eines störeffekts auf ein gradientensystem |
| DE102023205673A1 (de) * | 2023-06-16 | 2024-12-19 | Siemens Healthineers Ag | Lokalspule mit Energiesparvorrichtung |
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 |
| 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 |
-
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 - Lifetime
- 1989-02-14 IL IL89279A patent/IL89279A/xx not_active IP Right Cessation
- 1989-03-06 EP EP89302236A patent/EP0332383B1/en 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 |
|---|---|
| JPH027940A (ja) | 1990-01-11 |
| US4950994A (en) | 1990-08-21 |
| IL89279A (en) | 1992-03-29 |
| IL89279A0 (en) | 1989-09-10 |
| DE68924611D1 (de) | 1995-11-30 |
| EP0332383B1 (en) | 1995-10-25 |
| CA1304126C (en) | 1992-06-23 |
| EP0332383A2 (en) | 1989-09-13 |
| EP0332383A3 (en) | 1990-11-28 |
| JPH0418855B2 (cg-RX-API-DMAC7.html) | 1992-03-27 |
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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 |