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 PDFInfo
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- 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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- phase
- current
- conductive structure
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- induced
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 59
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- 239000004020 conductor Substances 0.000 claims description 20
- 230000008878 coupling Effects 0.000 claims description 8
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- 238000003384 imaging method Methods 0.000 abstract description 7
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Classifications
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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
Landscapes
- 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.
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
ID=51349101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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)
| Country | Link |
|---|---|
| CA (1) | CA2805580C (fr) |
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2013
- 2013-02-13 CA CA2805580A patent/CA2805580C/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2805580A1 (fr) | 2014-08-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20180209 |