JPH0576851B2 - - Google Patents
Info
- Publication number
- JPH0576851B2 JPH0576851B2 JP2091346A JP9134690A JPH0576851B2 JP H0576851 B2 JPH0576851 B2 JP H0576851B2 JP 2091346 A JP2091346 A JP 2091346A JP 9134690 A JP9134690 A JP 9134690A JP H0576851 B2 JPH0576851 B2 JP H0576851B2
- Authority
- JP
- Japan
- Prior art keywords
- nmr
- response
- magnetic resonance
- magnetic
- phase
- 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
- 230000003068 static effect Effects 0.000 claims abstract description 42
- 230000005291 magnetic effect Effects 0.000 claims description 228
- 230000004044 response Effects 0.000 claims description 169
- 238000005481 NMR spectroscopy Methods 0.000 claims description 154
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 114
- 238000000034 method Methods 0.000 claims description 71
- 238000012545 processing Methods 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 3
- 230000001131 transforming effect Effects 0.000 claims description 3
- 238000009795 derivation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 51
- 238000010586 diagram Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 15
- 238000002592 echocardiography Methods 0.000 description 11
- 230000005284 excitation Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 238000012307 MRI technique Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 101710162453 Replication factor A Proteins 0.000 description 1
- 102100035729 Replication protein A 70 kDa DNA-binding subunit Human genes 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012549 training 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
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
- G01R33/583—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency
-
- 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
- G01R33/56563—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (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)
- Magnetic Resonance Imaging Apparatus (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US33368189A | 1989-04-05 | 1989-04-05 | |
| US333,681 | 1989-04-05 | ||
| US07/363,187 US4970457A (en) | 1989-04-05 | 1989-06-08 | MRI compensated for spurious rapid variations in static magnetic field during a single MRI sequence |
| US363,187 | 1989-06-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0484937A JPH0484937A (ja) | 1992-03-18 |
| JPH0576851B2 true JPH0576851B2 (en, 2012) | 1993-10-25 |
Family
ID=26988849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2091346A Granted JPH0484937A (ja) | 1989-04-05 | 1990-04-05 | 単一のｍｒｉシーケンス中の静の磁界におけるスプリアスで急速な変化に対して補償されるｍｒｉ |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4970457A (en, 2012) |
| EP (1) | EP0391515B1 (en, 2012) |
| JP (1) | JPH0484937A (en, 2012) |
| AT (1) | ATE145730T1 (en, 2012) |
| DE (1) | DE69029216D1 (en, 2012) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005021690A (ja) * | 2003-07-02 | 2005-01-27 | Ge Medical Systems Global Technology Co Llc | 多相型ｒｆパルス・フリップ角を組み入れて高磁場ｍｒ撮像でのｒｆ電力を低減する方法及び装置 |
Families Citing this family (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8819705D0 (en) * | 1988-08-19 | 1988-09-21 | Royal Marsden Hospital | Improvements in nmr spectroscopy localisation |
| US5239266A (en) * | 1990-08-03 | 1993-08-24 | The Regents Of The University Of California | MRI using variable imaging parameter(s) within a single image sequence |
| US5245286A (en) * | 1991-04-18 | 1993-09-14 | The Regents Of The University Of California | Apparatus and method for stabilizing the background magnetic field during mri |
| AU655079B2 (en) * | 1991-10-25 | 1994-12-01 | University Of Queensland, The | Compensation of pulsed linear magnet field gradient inducted eddy currents in NMR systems |
| EP0538668B1 (en) * | 1991-10-25 | 1996-06-26 | The University Of Queensland | Correction of signal distortion in an NMR apparatus |
| US5227728A (en) * | 1991-11-01 | 1993-07-13 | The Regents Of The University Of California | Gradient driver control in magnetic resonance imaging |
| US5442290A (en) * | 1992-08-04 | 1995-08-15 | The Regents Of The University Of California | MRI gradient drive current control using all digital controller |
| DE4316642A1 (de) * | 1993-05-18 | 1994-11-24 | Siemens Ag | Abschirmkammer mit einer nicht störenden und störunempfindlichen Monitor-Anzeigevorrichtung |
| JP3472620B2 (ja) * | 1994-06-28 | 2003-12-02 | ジーイー横河メディカルシステム株式会社 | Ｍｒｉ装置 |
| DE4445782C1 (de) * | 1994-12-21 | 1996-07-25 | Siemens Ag | Verfahren zur Phasenkorrektur von Kernresonanzsignalen |
| US5537039A (en) * | 1995-10-10 | 1996-07-16 | General Electric Company | Virtual frequency encoding of acquired NMR image data |
| US5652514A (en) * | 1996-03-25 | 1997-07-29 | Toshiba America Mri, Inc. | Correction for field variation in steady-state MRI by repeated acquisition of zero k-space line |
| DE19702831A1 (de) * | 1997-01-27 | 1998-03-12 | Siemens Ag | Vorrichtung zur Kompensation von externen Feldstörungen des Grundmagnetfeldes bei Kernspintomographen |
| US5891032A (en) * | 1997-04-10 | 1999-04-06 | Elscint Ltd | Fat free TOF angiography |
| DE19715113C2 (de) * | 1997-04-11 | 1999-01-28 | Siemens Ag | Verfahren zur Phasenkorrektur von Kernresonanzsignalen |
| US6114853A (en) * | 1997-06-25 | 2000-09-05 | Toshiba America Mri, Inc. | NMR methods for qualification of sequence-induced B0 oscillation and correction of the resultant image artifacts in MRI |
| 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 |
| JP3513076B2 (ja) * | 2000-04-07 | 2004-03-31 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Ｍｒｉ装置 |
| US6795723B1 (en) * | 2000-05-22 | 2004-09-21 | Koninklijke Philips Electronics, N.V. | Interleaved phase encoding acquisition for MRI with controllable artifact suppression and flexible imaging parameter selection |
| DE10036207B4 (de) * | 2000-07-25 | 2006-11-30 | Siemens Ag | Verfahren zum Durchführen einer Perfusionsmessung mittels Magnetresonanzbildgebung |
| 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 |
| US6472872B1 (en) | 2001-06-29 | 2002-10-29 | Mayo Foundation For Medical Education And Research | Real-time shimming of polarizing field in magnetic resonance system |
| US6933720B2 (en) * | 2001-12-11 | 2005-08-23 | Toshiba America Mri, Inc. | Sequence preconditioning for ultra-fast magnetic resonance imaging |
| EP1664821B1 (en) * | 2003-09-16 | 2007-12-12 | Koninklijke Philips Electronics N.V. | A method of monitoring a magnetic field drift of a magnetic resonance imaging apparatus |
| US6995559B2 (en) * | 2003-10-30 | 2006-02-07 | Ge Medical Systems Global Technology Company, Llc | Method and system for optimized pre-saturation in MR with corrected transmitter frequency of pre-pulses |
| DE102006005285A1 (de) | 2006-02-06 | 2007-08-16 | Siemens Ag | Magnetresonanzeinrichtung sowie Verfahren zur Überwachung einer Magnetresonanzeinrichtung |
| US7471086B2 (en) * | 2007-04-20 | 2008-12-30 | General Electric Company | Magnetic resonance imaging visualization method and system |
| DE102007033874B4 (de) * | 2007-07-20 | 2010-07-01 | Siemens Ag | Verfahren zur Bestimmung von lokalen Abweichungen eines Grundmagnetfeldes eines Magnetresonanzgerätes von einem Soll-Wert sowie Computerprogramm, Bildverarbeitungseinheit und Magnetresonanzgerät zur Durchführung des Verfahrens |
| DE102007033897B4 (de) * | 2007-07-20 | 2010-02-11 | Siemens Ag | Verfahren zur Korrektur von Verzeichnungen in mittels eines Magnetresonanzgeräts aufgenommenen Bilddatensätzen sowie Computerprogramm zur Durchführung dieses Verfahrens |
| DE102007033880B4 (de) * | 2007-07-20 | 2010-06-24 | Siemens Ag | Verfahren zur Korrektur von Verzeichnungen in mittels eines Magnetresonanzgeräts aufgenommenen Bilddatensätzen sowie Computerprogramm, Bildverarbeitungseinheit und Magnetresonanzgerät zur Durchführung des Verfahrens |
| 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 |
| EP3077836B1 (en) * | 2013-12-02 | 2022-05-25 | Koninklijke Philips N.V. | Magnetic resonance imaging using zero echo time pulse sequences |
| DE102015209838B4 (de) * | 2015-05-28 | 2017-04-13 | Siemens Healthcare Gmbh | Verfahren zu einer Korrektur von Magnetresonanz-Messdaten |
| US20230297646A1 (en) * | 2022-03-18 | 2023-09-21 | Change Healthcare Holdings, Llc | System and methods for classifying magnetic resonance imaging (mri) image characteristics |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3495162A (en) * | 1967-05-19 | 1970-02-10 | Varian Associates | Pulsed gyromagnetic resonance spectrometer employing an internal control sample and automatic homogeneity control |
| US3496454A (en) * | 1967-05-19 | 1970-02-17 | Varian Associates | Frequency tracking magnetic field regulator employing means for abruptly shifting the regulated field intensity |
| GB1584950A (en) * | 1978-05-25 | 1981-02-18 | Emi Ltd | Imaging systems |
| US4685468A (en) * | 1983-03-18 | 1987-08-11 | Albert Macovski | NMR imaging system using field compensation |
| JPS60222044A (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方法および装置 |
| 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 |
| JPS63109849A (ja) * | 1986-10-29 | 1988-05-14 | 株式会社日立メディコ | Ｎｍｒイメ−ジング装置 |
| 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 |
| US4885549A (en) * | 1988-11-30 | 1989-12-05 | General Electric Company | Method of phase and amplitude correction of NMR signals using a reference marker |
-
1989
- 1989-06-08 US US07/363,187 patent/US4970457A/en not_active Expired - Lifetime
-
1990
- 1990-01-19 AT AT90300576T patent/ATE145730T1/de not_active IP Right Cessation
- 1990-01-19 EP EP90300576A patent/EP0391515B1/en not_active Expired - Lifetime
- 1990-01-19 DE DE69029216T patent/DE69029216D1/de not_active Expired - Lifetime
- 1990-04-05 JP JP2091346A patent/JPH0484937A/ja active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005021690A (ja) * | 2003-07-02 | 2005-01-27 | Ge Medical Systems Global Technology Co Llc | 多相型ｒｆパルス・フリップ角を組み入れて高磁場ｍｒ撮像でのｒｆ電力を低減する方法及び装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE145730T1 (de) | 1996-12-15 |
| EP0391515A2 (en) | 1990-10-10 |
| DE69029216D1 (de) | 1997-01-09 |
| EP0391515A3 (en) | 1991-05-02 |
| US4970457A (en) | 1990-11-13 |
| JPH0484937A (ja) | 1992-03-18 |
| EP0391515B1 (en) | 1996-11-27 |
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