CA2805580C - Systeme et methode de mesure du courant de radiofrequence induit a l'aide d'une imagerie par resonance magnetique a contraste de phase - Google Patents

Systeme et methode de mesure du courant de radiofrequence induit a l'aide d'une imagerie par resonance magnetique a contraste de phase Download PDF

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Publication number
CA2805580C
CA2805580C CA2805580A CA2805580A CA2805580C CA 2805580 C CA2805580 C CA 2805580C CA 2805580 A CA2805580 A CA 2805580A CA 2805580 A CA2805580 A CA 2805580A CA 2805580 C CA2805580 C CA 2805580C
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Prior art keywords
phase
current
conductive structure
recited
induced
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CA2805580A
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CA2805580A1 (fr
Inventor
Greg Griffin
Kevan Anderson
Graham Wright
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Sunnybrook Health Sciences Centre
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Sunnybrook Health Sciences Centre
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Priority to CA2805580A priority Critical patent/CA2805580C/fr
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    • 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]
    • G01R33/443—Assessment of an electric or a magnetic field, e.g. spatial mapping, determination of a B0 drift or dosimetry
    • 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
    • G01R33/5659—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the RF magnetic field, e.g. spatial inhomogeneities of the RF magnetic field

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  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Il est décrit une méthode pour mesurer automatiquement les courants induits dans des structures conductrices placées dans louverture dun appareil dimagerie par résonance magnétique (IRM) au moyen dune seule image par résonance magnétique. Une structure conductrice est placée dans louverture de lappareil dIRM pendant le procédé dimagerie. Lorsque lappareil dIRM transmet un champ de résonance magnétique, un courant est induit dans la structure conductrice. Le courant crée un champ magnétique de fréquence cyclotron, qui se couple au champ magnétique de résonance magnétique à proximité de la structure conductrice. Le champ magnétique modifié entraîne la création dun artefact dans les images de phase. Lartefact dans limage de phase est ensuite analysé pour déterminer le courant induit dans la structure conductrice.
CA2805580A 2013-02-13 2013-02-13 Systeme et methode de mesure du courant de radiofrequence induit a l'aide d'une imagerie par resonance magnetique a contraste de phase Active CA2805580C (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2805580A CA2805580C (fr) 2013-02-13 2013-02-13 Systeme et methode de mesure du courant de radiofrequence induit a l'aide d'une imagerie par resonance magnetique a contraste de phase

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2805580A CA2805580C (fr) 2013-02-13 2013-02-13 Systeme et methode de mesure du courant de radiofrequence induit a l'aide d'une imagerie par resonance magnetique a contraste de phase

Publications (2)

Publication Number Publication Date
CA2805580A1 CA2805580A1 (fr) 2014-08-13
CA2805580C true CA2805580C (fr) 2020-07-21

Family

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Family Applications (1)

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CA2805580A Active CA2805580C (fr) 2013-02-13 2013-02-13 Systeme et methode de mesure du courant de radiofrequence induit a l'aide d'une imagerie par resonance magnetique a contraste de phase

Country Status (1)

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CA (1) CA2805580C (fr)

Also Published As

Publication number Publication date
CA2805580A1 (fr) 2014-08-13

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