DE102008051039A8 - Reduction of EPI image artifacts on rotated layers - Google Patents

Reduction of EPI image artifacts on rotated layers Download PDF

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Publication number
DE102008051039A8
DE102008051039A8 DE200810051039 DE102008051039A DE102008051039A8 DE 102008051039 A8 DE102008051039 A8 DE 102008051039A8 DE 200810051039 DE200810051039 DE 200810051039 DE 102008051039 A DE102008051039 A DE 102008051039A DE 102008051039 A8 DE102008051039 A8 DE 102008051039A8
Authority
DE
Germany
Prior art keywords
reduction
image artifacts
epi image
rotated layers
layers
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.)
Ceased
Application number
DE200810051039
Other languages
German (de)
Other versions
DE102008051039A1 (en
Inventor
Thorsten Dr. Feiweier
Thorsten Dr. Speckner
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE200810051039 priority Critical patent/DE102008051039A1/en
Publication of DE102008051039A1 publication Critical patent/DE102008051039A1/en
Publication of DE102008051039A8 publication Critical patent/DE102008051039A8/en
Ceased legal-status Critical Current

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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
    • G01R33/565—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
    • 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]
    • G01R33/5616—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 gradient refocusing, e.g. EPI
    • 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
    • G01R33/56509—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to motion, displacement or flow, e.g. gradient moment nulling
    • 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
DE200810051039 2008-10-09 2008-10-09 Gradient-conditioned magnetic resonance signal shift correction method, involves determining image plane in object, and correcting signal shift before selection of signal for axes, where signal selection takes place along axes Ceased DE102008051039A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200810051039 DE102008051039A1 (en) 2008-10-09 2008-10-09 Gradient-conditioned magnetic resonance signal shift correction method, involves determining image plane in object, and correcting signal shift before selection of signal for axes, where signal selection takes place along axes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810051039 DE102008051039A1 (en) 2008-10-09 2008-10-09 Gradient-conditioned magnetic resonance signal shift correction method, involves determining image plane in object, and correcting signal shift before selection of signal for axes, where signal selection takes place along axes

Publications (2)

Publication Number Publication Date
DE102008051039A1 DE102008051039A1 (en) 2010-02-11
DE102008051039A8 true DE102008051039A8 (en) 2010-07-08

Family

ID=41501415

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200810051039 Ceased DE102008051039A1 (en) 2008-10-09 2008-10-09 Gradient-conditioned magnetic resonance signal shift correction method, involves determining image plane in object, and correcting signal shift before selection of signal for axes, where signal selection takes place along axes

Country Status (1)

Country Link
DE (1) DE102008051039A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701356A1 (en) * 1996-04-25 1997-10-30 Gen Electric Reduction of Nyquist ghosting artifacts with oblique echo planar imaging
DE19821780A1 (en) * 1997-06-17 1998-12-24 Gen Electric Correction of artefacts caused by Maxwell terms in section shift echo planar imaging
DE102005040548A1 (en) * 2005-08-26 2007-03-01 Siemens Ag Method for reducing Nyquist ghosting in medical magnetic resonance tomography (MRT), involves obtaining artifact-reduced image data for ghosting reduction through Fourier transform of corrected phase-coded data

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29604732U1 (en) * 1996-03-14 1996-05-30 Hoppmann Karl F Envelope

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701356A1 (en) * 1996-04-25 1997-10-30 Gen Electric Reduction of Nyquist ghosting artifacts with oblique echo planar imaging
DE19821780A1 (en) * 1997-06-17 1998-12-24 Gen Electric Correction of artefacts caused by Maxwell terms in section shift echo planar imaging
DE102005040548A1 (en) * 2005-08-26 2007-03-01 Siemens Ag Method for reducing Nyquist ghosting in medical magnetic resonance tomography (MRT), involves obtaining artifact-reduced image data for ghosting reduction through Fourier transform of corrected phase-coded data

Also Published As

Publication number Publication date
DE102008051039A1 (en) 2010-02-11

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OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OP8 Request for examination as to paragraph 44 patent law
8196 Reprint pf faulty title page (publication); german patentblatt: part 1a6
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OP8 Request for examination as to paragraph 44 patent law
8131 Rejection