DE102005036513A1 - Magnetic resonance-antenna array e.g. head antenna, for examination of patient`s head, has antenna units, in which one units has conductor section and additional sections, where former section forms conductor loop with additional sections - Google Patents
Magnetic resonance-antenna array e.g. head antenna, for examination of patient`s head, has antenna units, in which one units has conductor section and additional sections, where former section forms conductor loop with additional sections Download PDFInfo
- Publication number
- DE102005036513A1 DE102005036513A1 DE200510036513 DE102005036513A DE102005036513A1 DE 102005036513 A1 DE102005036513 A1 DE 102005036513A1 DE 200510036513 DE200510036513 DE 200510036513 DE 102005036513 A DE102005036513 A DE 102005036513A DE 102005036513 A1 DE102005036513 A1 DE 102005036513A1
- Authority
- DE
- Germany
- Prior art keywords
- antenna
- magnetic resonance
- array
- units
- elements
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6814—Head
-
- 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
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
- G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver channels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance 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
- G01R33/28—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
Abstract
Description
Die Erfindung betrifft ein Magnetresonanz-Antennenarray mit einem patientennahen Bereich, in dem eine Vielzahl von nebeneinander angeordneten Arrayelementen angeordnet ist, wobei jedes Arrayelement ein erstes und ein von dem ersten entkoppeltes zweites Antennenelement umfasst.The The invention relates to a magnetic resonance antenna array with a patient-near Area in which a plurality of juxtaposed array elements is arranged, each array element a first and a the first decoupled second antenna element comprises.
Ein
dementsprechendes Magnetresonanz-Antennenarray mit einem patientennahen
Bereich, in dem eine Vielzahl von nebeneinander angeordneten Arrayelementen
angeordnet ist, ist aus der
Aus
der
In
der
Mit Hilfe von Array-Antennen lässt sich bei der Magnetresosananzbildgebung das Signal-Rauschverhältnis und damit die Bildqualität erhöhen. Dabei gilt es, den mit der Erhöhung der Anzahl der Arrayelemente erzielbaren Signalgewinn dem dann notwendigen Aufwand, z.B. für die Hochfrequenz-Empfangskanäle und für den Bildrechner sowie für die benötigte Rekonstruktionszeit, gegenüber zu stellen, um ein Optimum zu erzielen. Zusätzlich muss dabei berücksichtigt noch werden, dass mit der Erhöhung der Anzahl der Arrayelemente auch die Antennenverluste im Vergleich zu den Patientenverlusten steigen. Experimente haben ergeben, dass für eine Ganzkörperbildgebung ein Optimum bei circa 50 Arrayelementen liegt. Dies bedeutet zum Beispiel, dass für eine Kopfantenne ein Optimum bei ca. 10 bis 15 einzelnen Arrayelementen liegt, die auf der Kopfoberfläche verteilt anzuordnen sind. Wird eine derartige Kopfantenne aus linearen Arrayelementen mit zum Beispiel Leiterschleifen aufgebaut, dann besitzen diese eine maximale Empfindlichkeit nur für Signale mit magnetischen Flussänderungen, die senkrecht durch die Leiterschleifenfläche gehen. Ist die magnetische Komponente des Magnetresonanzsignals schräg zur Leiterschleifenfläche ausgerichtet, vermindert sich das Empfangssignal und damit das Signal-Rauschverhältnis entsprechend.With Help of array antennas leaves in the magnetic resonance imaging, the signal-to-noise ratio and thus the picture quality increase. It applies, with the increase the number of array elements achievable signal gain then necessary Effort, e.g. For the radio frequency reception channels and for the image calculator as well as for the needed Reconstruction time, opposite to to achieve optimum results. In addition, it must be considered still be that with the increase the number of array elements and the antenna losses in comparison to increase patient losses. Experiments have shown that for one Whole body imaging an optimum is about 50 array elements. This means for Example that for a head antenna an optimum at about 10 to 15 individual array elements lies on the head surface are to be arranged distributed. If such a head antenna from linear Array elements constructed with, for example, conductor loops, then These have a maximum sensitivity only for signals with magnetic flux changes, which go vertically through the conductor loop surface. Is the magnetic Component of the magnetic resonance signal aligned obliquely to the conductor loop surface, reduced the received signal and thus the signal-to-noise ratio accordingly.
Der Erfindung liegt nun die Aufgabe zugrunde, ein Magnetresonanz-Antennenarray anzugeben, bei dem das Signal-Rauschverhältnis weiter verbessert ist.Of the The invention is based on the object, a magnetic resonance antenna array specify where the signal-to-noise ratio continues is improved.
Diese Aufgabe wird durch den Gegenstand des Anspruchs 1 gelöst.These The object is solved by the subject matter of claim 1.
Demgemäß ist vorgesehen, dass die ersten Antennenelemente mit ihren Leitern in dem Bereich angeordnet sind, dass die zweiten Antennenelemente jeweils einen ersten Leiterabschnitt umfassen, der in dem Bereich angeordnet ist, dass die zweiten Antennenelemente jeweils weitere Leiterabschnitte umfassen, die vom Patienten weg außerhalb des Bereichs angeordnet sind, und dass jeweils die ersten mit den weiteren Leiterabschnitten eine Leiterschleife bilden.Accordingly, it is provided that the first antenna elements are arranged with their conductors in the area in that the second antenna elements each have a first conductor section arranged in the region that the second antenna elements each include additional conductor sections away from the patient outside of the area are arranged, and that in each case the first with the further conductor sections form a conductor loop.
Die vorliegende Erfindung geht von der Tatsache aus, dass ein linear polarisierendes Arrayelement nur Komponenten von Flussänderungen detektieren kann, die senkrecht durch das Arrayelement treten. Durch die Kombination mit einem weiteren Antennenelement analog zur klassischen zirkular polarisierenden Antennenanordnung ist jedes Arrayelement nun auch in der Lage, Komponenten von Flussänderungen zu detektieren, die nicht senkrecht zum ersten Antennenelement ausgerichtet sind.The present invention is based on the fact that a linearly polarizing array element can only detect components of flux changes that pass vertically through the array element. By combining with another antenna element analogous to the classic circular polarizing antenna arrangement, each array element is now also able to detect components of flux changes that are not perpendicular to the first antenna element are aligned.
Die Unteransprüche geben vorteilhafte Ausführungsformen der Erfindung wieder. Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand von zwei Figuren erläutert. Es zeigen:The under claims give advantageous embodiments the invention again. Hereinafter will be an embodiment of the invention explained with reference to two figures. Show it:
Die
in
Die äußere Oberfläche
Die
zweiten Antennenelemente
Die
ersten und zweiten Antennenelemente
Bei
beliebig ausgerichteten Magnetresonanzsignalen werden sowohl von
dem ersten Antennenelement
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510036513 DE102005036513A1 (en) | 2005-08-03 | 2005-08-03 | Magnetic resonance-antenna array e.g. head antenna, for examination of patient`s head, has antenna units, in which one units has conductor section and additional sections, where former section forms conductor loop with additional sections |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510036513 DE102005036513A1 (en) | 2005-08-03 | 2005-08-03 | Magnetic resonance-antenna array e.g. head antenna, for examination of patient`s head, has antenna units, in which one units has conductor section and additional sections, where former section forms conductor loop with additional sections |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102005036513A1 true DE102005036513A1 (en) | 2006-08-03 |
Family
ID=36686506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200510036513 Ceased DE102005036513A1 (en) | 2005-08-03 | 2005-08-03 | Magnetic resonance-antenna array e.g. head antenna, for examination of patient`s head, has antenna units, in which one units has conductor section and additional sections, where former section forms conductor loop with additional sections |
Country Status (1)
Country | Link |
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DE (1) | DE102005036513A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2281208A1 (en) * | 2008-04-07 | 2011-02-09 | The University Of Queensland | Mri coil design |
CN102445673A (en) * | 2010-10-08 | 2012-05-09 | 西门子公司 | Magnet resonance system and method for transmitting high-frequency signal and method thereof |
CN103869269A (en) * | 2012-12-11 | 2014-06-18 | 三星电子株式会社 | Phased array RF coil module for magnetic resonance imaging |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5430378A (en) * | 1994-02-22 | 1995-07-04 | Board Of Regents - Univ Of Ne | NMR quadrature detection array |
DE19505062A1 (en) * | 1995-02-15 | 1996-10-31 | Siemens Ag | Head-array antenna for magnetic resonance tomography |
US6317091B1 (en) * | 1998-09-29 | 2001-11-13 | Siemens Aktiengesellschaft | Apparatus for inductively coupling a nuclear magnetic resonance signal into a reception antenna, and medical instrument incorporating such an apparatus |
DE10334170B3 (en) * | 2003-07-26 | 2005-06-02 | Physikalisch-Technische Bundesanstalt Braunschweig Und Berlin | Arrangement for generating high-frequency B1 fields in NMR with surface current antennas |
-
2005
- 2005-08-03 DE DE200510036513 patent/DE102005036513A1/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5430378A (en) * | 1994-02-22 | 1995-07-04 | Board Of Regents - Univ Of Ne | NMR quadrature detection array |
DE19505062A1 (en) * | 1995-02-15 | 1996-10-31 | Siemens Ag | Head-array antenna for magnetic resonance tomography |
US6317091B1 (en) * | 1998-09-29 | 2001-11-13 | Siemens Aktiengesellschaft | Apparatus for inductively coupling a nuclear magnetic resonance signal into a reception antenna, and medical instrument incorporating such an apparatus |
DE10334170B3 (en) * | 2003-07-26 | 2005-06-02 | Physikalisch-Technische Bundesanstalt Braunschweig Und Berlin | Arrangement for generating high-frequency B1 fields in NMR with surface current antennas |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2281208A1 (en) * | 2008-04-07 | 2011-02-09 | The University Of Queensland | Mri coil design |
EP2281208A4 (en) * | 2008-04-07 | 2012-06-13 | Univ Queensland | Mri coil design |
US9429634B2 (en) | 2008-04-07 | 2016-08-30 | University Of Queensland | MRI coil design with volumetric trough-shaped coil elements |
CN102445673A (en) * | 2010-10-08 | 2012-05-09 | 西门子公司 | Magnet resonance system and method for transmitting high-frequency signal and method thereof |
US9121908B2 (en) | 2010-10-08 | 2015-09-01 | Siemens Aktiengesellschaft | Magnetic resonance system and a method for emitting high-frequency signals |
CN102445673B (en) * | 2010-10-08 | 2016-06-15 | 西门子公司 | For sending magnetic resonance system and the method for high-frequency signal |
CN103869269A (en) * | 2012-12-11 | 2014-06-18 | 三星电子株式会社 | Phased array RF coil module for magnetic resonance imaging |
EP2743716A1 (en) * | 2012-12-11 | 2014-06-18 | Samsung Electronics Co., Ltd | Phased array RF coil module for magnetic resonance imaging |
US9632152B2 (en) | 2012-12-11 | 2017-04-25 | Samsung Electronics Co., Ltd. | Phased array RF coil module and magnetic resonance imaging apparatus using the same |
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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 | ||
8131 | Rejection |