KR20020070771A - 다중 에코우-이미지 형성 방법 - Google Patents
다중 에코우-이미지 형성 방법 Download PDFInfo
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- KR20020070771A KR20020070771A KR1020010081625A KR20010081625A KR20020070771A KR 20020070771 A KR20020070771 A KR 20020070771A KR 1020010081625 A KR1020010081625 A KR 1020010081625A KR 20010081625 A KR20010081625 A KR 20010081625A KR 20020070771 A KR20020070771 A KR 20020070771A
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- 238000003384 imaging method Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000005284 excitation Effects 0.000 claims abstract description 16
- 230000010354 integration Effects 0.000 claims description 8
- 230000005415 magnetization Effects 0.000 abstract description 17
- 238000002595 magnetic resonance imaging Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 12
- 238000000264 spin echo pulse sequence Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 238000010587 phase diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000002592 echocardiography Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000000414 obstructive effect Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012772 sequence design Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
-
- 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
- G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
-
- 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
- G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
- G01R33/5617—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] using RF refocusing, e.g. RARE
-
- 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
- G01R33/56554—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by acquiring plural, differently encoded echo signals after one RF excitation, e.g. correction for readout gradients of alternating polarity in EPI
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- General Health & Medical Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Signal Processing (AREA)
- Molecular Biology (AREA)
- Medical Informatics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Heart & Thoracic Surgery (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Biomedical Technology (AREA)
- Pathology (AREA)
- Biophysics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims (10)
- 하나의 고주파수-여기 펄스(100) 및 후속하는 다수의 고주파수-리포커싱 펄스(102)를 포함하며, 상기 고주파수-리포커싱 펄스(102) 사이에서 각각 적어도 2개의 위상 코우딩 경사도 펄스(106, 108)가 발생되도록 구성된 다수의 고주파수 펄스를 얻기 위한, 자기 공명을 이용한 다중 에코우-이미지 형성 방법.
- 제 1 항에 있어서,상기 보상-위상 코우딩 경사도 펄스(116, 118)의 진폭이 상기 후속하는 위상 코우딩 경사도 펄스(106, 108)의 진폭과 일치하는 것을 특징으로 하는 방법.
- 제 1 항 또는 제 2 항에 있어서,상기 보상-위상 코우딩 경사도 펄스(116, 118)간의 시간격의 크기(120)는 후속하는 2개의 위상 코우딩 경사도 펄스(106, 108)간의 시간격의 크기(122)의 절반인 것을 특징으로 하는 방법.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,상기 보상-위상 코우딩 경사도 펄스(116, 118)의 펄스 지속 시간의 크기(124)는 후속하는 2개의 위상 코우딩 경사도 펄스(106, 108)의 펄스 지속 시간의 크기(126)의 절반인 것을 특징으로 하는 방법.
- 제 1 항 내지 제 4 항 중 어느 한 항에 있어서,상기 위상 코우딩 경사도 펄스(106, 108)의 펄스 진폭은 개별 고주파수-리포커싱 펄스(102) 사이에서 변동되는 것을 특징으로 하는 방법.
- 제 1 항 내지 제 4 항 중 어느 한 항에 있어서,상기 위상 코우딩 경사도 펄스(106, 108)의 펄스 지속 시간(126)은 개별 고주파수-리포커싱 펄스(102) 사이에서 변동되는 것을 특징으로 하는 방법.
- 제 6 항에 있어서,상기 위상 코우딩 경사도 펄스(106, 108)의 펄스 진폭은 대체로 크기가 동일한 것을 특징으로 하는 방법.
- 제 1 항 내지 제 7 항 중 어느 한 항에 있어서,상기 위상 코우딩 경사도 펄스(106, 108)는 고주파수 펄스(102) 사이에서 각각 하나의 시간 적분값을 가지며, 상기 값은 상응하는 고주파수 펄스(102) 사이에서 극성 신호 반전된 장애 필드(114)의 시간 적분값과 일치하는 것을 특징으로 하는 방법.
- 제 1 항 내지 제 8 항 중 어느 한 항에 있어서,상기 고주파수 펄스(100, 102) 사이에서는 장애 필드(114)와 동시에 및 극성 신호 반전되어 추가의 위상 코우딩-보상 펄스(130, 132)가 발생되는 것을 특징으로 방법.
- 제 9 항에 있어서,고주파수 펄스 사이에 있는 상기 추가의 위상 코우딩-보상 펄스(132)는, 위상 코우딩 경사도 펄스(106, 108, 116, 118) 사이에서 나타나는 장애 필드(114)와 동일하지만 극성 신호 반전된 시간 적분값을 갖는 것을 특징으로 하는 방법.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10063676A DE10063676B4 (de) | 2000-12-20 | 2000-12-20 | Multiecho-Bildgebungsverfahren |
DE10063676.4 | 2000-12-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20020070771A true KR20020070771A (ko) | 2002-09-11 |
KR100669567B1 KR100669567B1 (ko) | 2007-01-15 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020010081625A KR100669567B1 (ko) | 2000-12-20 | 2001-12-20 | 다중 에코우-이미지 형성 방법 |
Country Status (5)
Country | Link |
---|---|
US (1) | US6667617B2 (ko) |
JP (1) | JP3987337B2 (ko) |
KR (1) | KR100669567B1 (ko) |
CN (1) | CN1244821C (ko) |
DE (1) | DE10063676B4 (ko) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005006979A1 (ja) * | 2003-07-17 | 2005-01-27 | Hitachi Medical Corporation | 磁気共鳴イメージング方法及び装置 |
US8482281B2 (en) * | 2010-04-01 | 2013-07-09 | General Electric Company | Apparatus and method for parallel transmission of RF pulses in a spin echo sequence |
KR101126162B1 (ko) * | 2010-06-14 | 2012-03-22 | 아주대학교산학협력단 | 다중 에코 mr 영상의 혈류인공물 제거 방법 |
DE102011082010B4 (de) * | 2011-09-01 | 2013-03-14 | Siemens Aktiengesellschaft | Rephasierung von Spinsystemen in einer ersten und zweiten Schicht in Schicht-Multiplexing-Messsequenzen zur Magnetresonanzbildgebung |
CN102594461A (zh) * | 2012-03-23 | 2012-07-18 | 斯肯威(上海)工业检测科技有限公司 | 一种组合调制超声波脉冲收发方法及装置 |
DE102012205587B4 (de) | 2012-04-04 | 2013-12-24 | Siemens Aktiengesellschaft | Schichtspezifische Phasenkorrektur bei Schicht-Multiplexing |
DE102012218422B3 (de) | 2012-10-10 | 2014-02-27 | Siemens Aktiengesellschaft | Schnelle MR-Bildaufnahme mit erhöhtem Kontrast |
DE102013206026B3 (de) | 2013-04-05 | 2014-08-28 | Siemens Aktiengesellschaft | Optimierte Gradientenecho-Multiecho-Messsequenz |
EP3748386A1 (en) | 2019-06-03 | 2020-12-09 | Siemens Healthcare GmbH | Minimization of effects of concomitant fields in multi echo magnetic resonance imaging |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3175939B2 (ja) * | 1990-11-30 | 2001-06-11 | 株式会社東芝 | 磁気共鳴映像装置 |
US5280244A (en) * | 1992-03-19 | 1994-01-18 | General Electric Company | Gradient moment nulling in a fast spin echo NMR pulse sequence |
JP3505294B2 (ja) * | 1995-03-28 | 2004-03-08 | ジーイー横河メディカルシステム株式会社 | Mri装置 |
JP3707829B2 (ja) * | 1995-06-22 | 2005-10-19 | 株式会社東芝 | 磁気共鳴イメージング装置 |
GB9513544D0 (en) * | 1995-07-04 | 1995-09-06 | Marconi Gec Ltd | Magnetic resonance methods and apparatus |
US5612619A (en) * | 1995-07-31 | 1997-03-18 | Feinberg David A | Grase-type three-dimensional MR pulse sequences |
US5578924A (en) * | 1995-11-15 | 1996-11-26 | General Electric Company | Methods for the simultaneous detection of multiple magnetic resonance images |
DE19652559B4 (de) * | 1995-12-26 | 2009-10-01 | General Electric Co. | Verfahren zur Magnet-Resonanz-Angiographie unter Verwendung eines Zustroms mit Quer-Spin-Magnetisierung |
US6011392A (en) | 1997-04-10 | 2000-01-04 | General Electric Company | Method for reducing Maxwell term artifacts in fast spin echo MR images |
US6181134B1 (en) * | 1998-03-09 | 2001-01-30 | The Mclean Hospital Corporation | Magnetic resonance imaging of the distribution of a marker compound without obtaining spectral information |
WO2000002059A2 (en) * | 1998-07-02 | 2000-01-13 | Koninklijke Philips Electronics N.V. | Method to reduce artefacts in the magnetic resonance image due to spurios magnetic signals |
US6043656A (en) * | 1998-11-23 | 2000-03-28 | General Electric Company | Method for compensating an MRI system for residual magnetization |
JP2000185026A (ja) * | 1998-12-22 | 2000-07-04 | Ge Yokogawa Medical Systems Ltd | Mrイメージング方法およびmrイメージング装置 |
JP2000201904A (ja) * | 1999-01-19 | 2000-07-25 | General Electric Co <Ge> | 高速スピン・エコ―磁気共鳴画像のマクスウェル項によるア―ティファクトを減少させる核磁気共鳴システム |
US6369568B1 (en) * | 1999-06-03 | 2002-04-09 | Ge Medical Systems Global Technology Company, Llc | Fast spin echo phase correction for MRI system |
-
2000
- 2000-12-20 DE DE10063676A patent/DE10063676B4/de not_active Expired - Fee Related
-
2001
- 2001-12-17 US US10/022,684 patent/US6667617B2/en not_active Expired - Lifetime
- 2001-12-19 JP JP2001386387A patent/JP3987337B2/ja not_active Expired - Fee Related
- 2001-12-20 CN CNB011457481A patent/CN1244821C/zh not_active Expired - Lifetime
- 2001-12-20 KR KR1020010081625A patent/KR100669567B1/ko active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
US20020135366A1 (en) | 2002-09-26 |
CN1244821C (zh) | 2006-03-08 |
CN1389740A (zh) | 2003-01-08 |
KR100669567B1 (ko) | 2007-01-15 |
JP3987337B2 (ja) | 2007-10-10 |
US6667617B2 (en) | 2003-12-23 |
JP2002200057A (ja) | 2002-07-16 |
DE10063676A1 (de) | 2002-07-04 |
DE10063676B4 (de) | 2006-08-17 |
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