FR2630825B1 - Procede et dispositif pour la correction d'une degradation de phase provoquee par des courants parasites - Google Patents

Procede et dispositif pour la correction d'une degradation de phase provoquee par des courants parasites

Info

Publication number
FR2630825B1
FR2630825B1 FR898905604A FR8905604A FR2630825B1 FR 2630825 B1 FR2630825 B1 FR 2630825B1 FR 898905604 A FR898905604 A FR 898905604A FR 8905604 A FR8905604 A FR 8905604A FR 2630825 B1 FR2630825 B1 FR 2630825B1
Authority
FR
France
Prior art keywords
degradation caused
correcting phase
interference currents
phase degradation
currents
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
Application number
FR898905604A
Other languages
English (en)
Other versions
FR2630825A1 (fr
Inventor
Yuval Zur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elscint Ltd
Original Assignee
Elscint Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elscint Ltd filed Critical Elscint Ltd
Publication of FR2630825A1 publication Critical patent/FR2630825A1/fr
Application granted granted Critical
Publication of FR2630825B1 publication Critical patent/FR2630825B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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]
    • G01R33/48—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
    • G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
    • G01R33/56308—Characterization of motion or flow; Dynamic 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
    • G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
    • G01R33/56518—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to eddy currents, e.g. caused by switching of the gradient magnetic field
    • 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
    • G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
    • G01R33/56308—Characterization of motion or flow; Dynamic imaging
    • G01R33/56316—Characterization of motion or flow; Dynamic imaging involving phase contrast techniques

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • General Health & Medical Sciences (AREA)
  • Radiology & Medical Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Vascular Medicine (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
FR898905604A 1988-04-29 1989-04-27 Procede et dispositif pour la correction d'une degradation de phase provoquee par des courants parasites Expired - Lifetime FR2630825B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IL86231A IL86231A (en) 1988-04-29 1988-04-29 Correction for eddy current caused phase degradation

Publications (2)

Publication Number Publication Date
FR2630825A1 FR2630825A1 (fr) 1989-11-03
FR2630825B1 true FR2630825B1 (fr) 1992-10-02

Family

ID=11058791

Family Applications (1)

Application Number Title Priority Date Filing Date
FR898905604A Expired - Lifetime FR2630825B1 (fr) 1988-04-29 1989-04-27 Procede et dispositif pour la correction d'une degradation de phase provoquee par des courants parasites

Country Status (6)

Country Link
US (1) US4954779A (fr)
JP (1) JP2773840B2 (fr)
DE (1) DE3912816A1 (fr)
FR (1) FR2630825B1 (fr)
IL (1) IL86231A (fr)
NL (1) NL8901068A (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027071A (en) * 1990-03-05 1991-06-25 General Electric Company Method of, and apparatus for, NMR slice selection
US5257625A (en) * 1990-11-26 1993-11-02 Board Of Trustees Of The Leland Stanford Junior University Method of noninvasive motion analysis by using forced closure of phase contrast MRI maps of velocity
US5226418A (en) * 1991-08-01 1993-07-13 General Electric Company Phase correction of complex - difference processed magnetic resonance angiograms
US5522390A (en) * 1991-11-21 1996-06-04 U.S. Philips Corporation Magnetic resonance imaging method
US5521502A (en) * 1994-04-25 1996-05-28 Georgia Tech Research Corporation Flow differentiation scheme for magnetic resonance angiography
DE19647537A1 (de) * 1996-11-16 1998-05-20 Philips Patentverwaltung MR-Verfahren zur Reduzierung von Bewegungsartefakten und Anordnung zur Durchführung des Verfahrens
US5923168A (en) * 1997-06-17 1999-07-13 General Electric Company Correction of artifacts caused by Maxwell terms in slice offset echo planar imaging
DE19834698C2 (de) 1997-08-19 2001-06-21 Siemens Ag Diffusionserfassung mittels magnetischer Resonanz
DE19749941A1 (de) * 1997-11-11 1998-08-20 Siemens Ag Bildverschiebungskorrektur bei diffusionsgewichteten Pulssequenzen
US6552542B1 (en) 2001-09-28 2003-04-22 The Board Of Trustees Of The Leland Stanford Junior University Oscillating dual-equilibrium steady state angiography using magnetic resonance imaging
US6815952B1 (en) * 2003-05-12 2004-11-09 The University Of Queensland Magnetic resonance diffusion imaging with eddy-current compensation
US7292032B1 (en) * 2004-09-28 2007-11-06 General Electric Company Method and system of enhanced phase suppression for phase-contrast MR imaging
DE102009058510B4 (de) * 2009-12-16 2012-03-08 Siemens Aktiengesellschaft Verfahren zur Bestimmung einer Hintergrundphase in Phasenbilddatensätzen
JP2013070765A (ja) * 2011-09-27 2013-04-22 Toshiba Corp 磁気共鳴イメージング装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595879A (en) * 1983-11-14 1986-06-17 Technicare Corporation Nuclear magnetic resonance flow imaging
JPH07108288B2 (ja) * 1985-02-15 1995-11-22 株式会社日立製作所 Ｎｍｒイメ−ジング方法
US4689560A (en) * 1985-08-16 1987-08-25 Picker International, Inc. Low R.F. dosage magnetic resonance imaging of high velocity flows
US4683431A (en) * 1985-08-16 1987-07-28 Picker International, Inc. Magnetic resonance imaging of high velocity flows
NL8602019A (nl) * 1986-08-07 1988-03-01 Philips Nv Magnetische resonantiewerkwijze en -inrichting voor het elimineren van fasefouten in beeldelementen van een complexe afbeelding van een kernmagnetisatieverdeling.
NL8701642A (nl) * 1987-07-13 1989-02-01 Philips Nv Werkwijze en inrichting voor het uitvoeren van een fasecorrectie bij mr angiografie.

Also Published As

Publication number Publication date
IL86231A0 (en) 1988-11-15
JPH0213435A (ja) 1990-01-17
US4954779A (en) 1990-09-04
IL86231A (en) 1991-07-18
DE3912816A1 (de) 1989-11-09
JP2773840B2 (ja) 1998-07-09
FR2630825A1 (fr) 1989-11-03
NL8901068A (nl) 1989-11-16

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Legal Events

Date Code Title Description
ST Notification of lapse