JPH06500947A - Nmrシステム及び別々に収集された1組のnmr信号から像を発生する方法 - Google Patents
Nmrシステム及び別々に収集された1組のnmr信号から像を発生する方法Info
- Publication number
- JPH06500947A JPH06500947A JP5503570A JP50357093A JPH06500947A JP H06500947 A JPH06500947 A JP H06500947A JP 5503570 A JP5503570 A JP 5503570A JP 50357093 A JP50357093 A JP 50357093A JP H06500947 A JPH06500947 A JP H06500947A
- Authority
- JP
- Japan
- Prior art keywords
- nmr
- signal
- excitation
- pulse
- signals
- 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.)
- Granted
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
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/446—Multifrequency selective RF pulses, e.g. multinuclear acquisition mode
-
- 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
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)
Abstract
Description
Claims (6)
- 1.別々に収集された1組のNMR信号から像を発生するNMR装置に於て、複 数個の別々のNMR信号を収集する為のバースト励振パルス順序が、何れも別々 に制御されるRF位相を持つ一連の別々のRF励振パルスで構成されたRF励振 バーストを発生し、RF励振バーストの間、読出し磁界勾配を発生して、それぞ れ1つずつ前記RF励振パルスに対応する一連の別々のNMR信号を発生させ、 該NMR信号が発生する間、読出し磁界勾配を発生し、前記一連の中の各々のN MR信号を別々に収集し、収集された各々のNMR信号の位相を、それに対応す るRF励振パルスの位相によって決定される量だけ調節し、調節済みのNMR信 号から像を再生することを含んでいるNMR装置。
- 2.前記バースト中の各々のRF励振パルスのはじき角が別々に制御され、前記 収集された各々のNMR信号の振幅がそれに対応するRF励振パルスのはじき角 によって決定された量だけ調節される請求項1記載のNMR装置。
- 3.各々の前記RF励振バーストが9個の別々のRF励振パルスを持ち、9個か らなる前記一連の別々のNMR信号が発生される請求項1記載のNMR装置。
- 4.相次いで発生される前記RF励振パルスのRF位相が略−45°,−45° ,18°,0°,−130°,180°,18°,135°及び−45°である 請求項3記載のNMR装置。
- 5.前記一連のNMR信号がRFエコー・パルスによって発生されるエコー信号 である請求項1記載のNMR装置。
- 6.相次いで発生される前記RF励振パルスのRF位相が実費的に45°,−4 5°,162°,89°,130°,89°,162°,−45°及び45°で ある請求項3記載のNMR装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US743,547 | 1985-06-11 | ||
US07/743,547 US5212448A (en) | 1991-08-09 | 1991-08-09 | Nmr pulse sequence with burst rf excitation pulses having separately controlled phase |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06500947A true JPH06500947A (ja) | 1994-01-27 |
JP2529529B2 JP2529529B2 (ja) | 1996-08-28 |
Family
ID=24989207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5503570A Expired - Lifetime JP2529529B2 (ja) | 1991-08-09 | 1992-07-10 | Nmrシステム及び別々に収集された1組のnmr信号から像を発生する方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US5212448A (ja) |
EP (1) | EP0552337A1 (ja) |
JP (1) | JP2529529B2 (ja) |
WO (1) | WO1993002618A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997035517A1 (fr) * | 1996-03-28 | 1997-10-02 | Hitachi Medical Corporation | Procede et appareil d'imagerie par resonance magnetique |
JP2009106493A (ja) * | 2007-10-30 | 2009-05-21 | Hitachi Ltd | 磁気共鳴検査装置及び高周波パルス波形算出方法 |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9016803D0 (en) * | 1990-07-31 | 1990-09-12 | Mansfield Peter | Echo-volumar imaging using 180grad rf pulses |
US5315249A (en) * | 1992-07-28 | 1994-05-24 | General Electric Company | Stabilized fast spin echo NMR pulse sequence |
DE4335102A1 (de) * | 1993-10-14 | 1995-04-20 | Fischer Ag | Einrichtung zur Ermittlung der Wirkung gepulster Magnetfelder auf einen Organismus |
US5544652A (en) * | 1994-03-04 | 1996-08-13 | The United States Of America As Represented By The Department Of Health And Human Services | Ultrafast burst imaging using shifting of excited regions |
DE59502349D1 (de) * | 1994-03-31 | 1998-07-02 | Siemens Ag | Pulssequenz für ein kernspintomographiegerät |
US5519534A (en) * | 1994-05-25 | 1996-05-21 | The Government Of The United States Of America As Represented By The Secretary Of The Department Of Health And Human Services | Irradiance attachment for an optical fiber to provide a uniform level of illumination across a plane |
DE4423806C2 (de) * | 1994-07-06 | 2000-08-24 | Siemens Ag | Verfahren zur MR-Bildgewinnung mit einer Folge von Einzelmessungen |
US5685305A (en) * | 1994-08-05 | 1997-11-11 | The United States Of America As Represented By The Department Of Health And Human Services | Method and system for MRI detection of abnormal blood flow |
AU5257296A (en) * | 1995-05-05 | 1996-11-21 | Motorola, Inc. | Method and system for demodulation of m-ary signaling |
JP3345527B2 (ja) * | 1995-05-16 | 2002-11-18 | 株式会社日立製作所 | 核磁気共鳴装置 |
US5548216A (en) * | 1995-11-15 | 1996-08-20 | General Electric Company | Methods for the simultaneous detection of multiple magnetic resonance images using phase modulated excitation |
US6163153A (en) * | 1998-09-11 | 2000-12-19 | Western Atlas International, Inc. | Nuclear magnetic resonance pulse sequence for optimizing instrument electrical power usage |
US6429654B1 (en) | 1998-09-11 | 2002-08-06 | Baker Hughes Incorporated | Nuclear magnetic resonance pulse sequence for improving signal-to-noise ratio |
JP3877926B2 (ja) * | 2000-02-22 | 2007-02-07 | 株式会社日立製作所 | 核磁気共鳴撮影装置 |
JP2002102200A (ja) * | 2000-09-26 | 2002-04-09 | Ge Medical Systems Global Technology Co Llc | 磁気共鳴信号獲得方法および装置、記録媒体並びに磁気共鳴撮影装置 |
US6690167B2 (en) | 2001-10-12 | 2004-02-10 | Baker Hughes Incorporated | Nuclear magnetic resonance pulse sequence with refocusing pulses having reduced tipping angle |
US6624630B1 (en) * | 2001-11-20 | 2003-09-23 | Koninklijke Philips Electronics, N.V. | Sliding frequency steady-state precession imaging |
DE10221850B4 (de) * | 2002-05-16 | 2007-04-05 | Siemens Ag | Verfahren zum Gestalten eines selektiven HF-Pulses und selektiver HF-Puls |
US6958606B2 (en) * | 2003-12-03 | 2005-10-25 | Ge Medical Systems Global Technology Co., Llc | NMR excitation method |
US8970217B1 (en) | 2010-04-14 | 2015-03-03 | Hypres, Inc. | System and method for noise reduction in magnetic resonance imaging |
DE102011080604B4 (de) * | 2011-08-08 | 2013-03-28 | Siemens Aktiengesellschaft | Betriebsverfahren, Computerprogramm und Steuereinrichtung für eine Magnetresonanzanlage mit frequenzvariablen Sendepulsen und Magnetresonanzanlage |
US10598750B2 (en) * | 2015-04-02 | 2020-03-24 | The General Hospital Corporation | 3D balanced EPI magnetic resonance fingerprinting |
WO2017111935A1 (en) * | 2015-12-22 | 2017-06-29 | Halliburton Energy Services, Inc. | Selective nmr pulse for downhole measurements |
JP6976711B2 (ja) * | 2017-04-28 | 2021-12-08 | キヤノン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及びパルス設計方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0179816B1 (en) * | 1984-04-05 | 1992-11-11 | Varian Associates, Inc. | Spatially selective nuclear magnetic resonance pulse sequences |
US4689566A (en) * | 1985-07-17 | 1987-08-25 | Advanced Nmr Systems, Inc. | NMR phase encoding using phase varying rf pulses |
US4914392A (en) * | 1987-03-27 | 1990-04-03 | Reagents Of The University Of Minnesota | Amplitude and frequency/phase modulated pulses to achieve plane rotations of nuclear spin magnetization vectors with inhomogeneous B1 |
JP2598038B2 (ja) * | 1987-09-30 | 1997-04-09 | 株式会社東芝 | 磁気共鳴映像装置 |
DE3824274A1 (de) * | 1988-07-16 | 1990-01-18 | Philips Patentverwaltung | Kernspinuntersuchungsverfahren und anordnung zur durchfuehrung des verfahrens |
DE3937428A1 (de) * | 1989-11-10 | 1991-05-16 | Philips Patentverwaltung | Kernspintomographieverfahren zur erzeugung getrennter fett- und wasserbilder und anordnung zur durchfuehrung des verfahrens |
US5027072A (en) * | 1989-12-07 | 1991-06-25 | The University Of Akron | Alternate method of Fourier transform NMR data acquisition |
-
1991
- 1991-08-09 US US07/743,547 patent/US5212448A/en not_active Expired - Lifetime
-
1992
- 1992-07-10 WO PCT/US1992/005778 patent/WO1993002618A1/en not_active Application Discontinuation
- 1992-07-10 EP EP92916491A patent/EP0552337A1/en not_active Withdrawn
- 1992-07-10 JP JP5503570A patent/JP2529529B2/ja not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997035517A1 (fr) * | 1996-03-28 | 1997-10-02 | Hitachi Medical Corporation | Procede et appareil d'imagerie par resonance magnetique |
JP2009106493A (ja) * | 2007-10-30 | 2009-05-21 | Hitachi Ltd | 磁気共鳴検査装置及び高周波パルス波形算出方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0552337A1 (en) | 1993-07-28 |
US5212448A (en) | 1993-05-18 |
JP2529529B2 (ja) | 1996-08-28 |
WO1993002618A1 (en) | 1993-02-18 |
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