CA2676510C - Decouplage de bobine pour un reseau de bobines de radiofrequences - Google Patents
Decouplage de bobine pour un reseau de bobines de radiofrequences Download PDFInfo
- Publication number
- CA2676510C CA2676510C CA2676510A CA2676510A CA2676510C CA 2676510 C CA2676510 C CA 2676510C CA 2676510 A CA2676510 A CA 2676510A CA 2676510 A CA2676510 A CA 2676510A CA 2676510 C CA2676510 C CA 2676510C
- Authority
- CA
- Canada
- Prior art keywords
- coil
- circuit
- amplifier circuit
- impedance
- pair
- 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.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 53
- 230000003750 conditioning effect Effects 0.000 claims abstract description 45
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 16
- 230000003321 amplification Effects 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 5
- 238000003491 array Methods 0.000 description 2
- 238000002595 magnetic resonance imaging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/365—Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array
-
- 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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Un réseau de bobines de radiofréquence d'imagerie par résonance magnétique comprend une pluralité de bobines de radiofréquence distinctes, chacune possédant un circuit de préamplification muni d'un circuit de conditionnement en avant du transistor, lequel comprend un inducteur et des condensateurs connectés aux bornes d'entrée du préamplificateur. Chacune des bobines possède un préamplificateur muni d'un circuit de découplage résonant en parallèle, afin de présenter une impédance élevée à la fréquence de résonance aux bornes de la bobine, cela pour inhiber le couplage des signaux provenant des bobines adjacentes et non adjacentes du réseau. Le circuit de découplage comprend un premier condensateur de valeur constante connecté aux bornes, un second condensateur variable sur l'un des conducteurs, un autre condensateur dans le circuit de conditionnement, ces condensateurs définissant ensemble une capacité qui coopère avec l'inductance définie par l'inducteur du circuit de conditionnement du préamplificateur pour former le circuit résonnant en parallèle, lequel permet de présenter une impédance élevée.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2676510A CA2676510C (fr) | 2009-08-24 | 2009-08-24 | Decouplage de bobine pour un reseau de bobines de radiofrequences |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2676510A CA2676510C (fr) | 2009-08-24 | 2009-08-24 | Decouplage de bobine pour un reseau de bobines de radiofrequences |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2676510A1 CA2676510A1 (fr) | 2011-02-24 |
| CA2676510C true CA2676510C (fr) | 2015-01-13 |
Family
ID=43618902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2676510A Active CA2676510C (fr) | 2009-08-24 | 2009-08-24 | Decouplage de bobine pour un reseau de bobines de radiofrequences |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2676510C (fr) |
-
2009
- 2009-08-24 CA CA2676510A patent/CA2676510C/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2676510A1 (fr) | 2011-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |