DE10228827A1 - Magnetic resonance unit for patient imaging has integral electrostrictive actuators controlled by feedback from high frequency sensor - Google Patents
Magnetic resonance unit for patient imaging has integral electrostrictive actuators controlled by feedback from high frequency sensor Download PDFInfo
- Publication number
- DE10228827A1 DE10228827A1 DE2002128827 DE10228827A DE10228827A1 DE 10228827 A1 DE10228827 A1 DE 10228827A1 DE 2002128827 DE2002128827 DE 2002128827 DE 10228827 A DE10228827 A DE 10228827A DE 10228827 A1 DE10228827 A1 DE 10228827A1
- Authority
- DE
- Germany
- Prior art keywords
- frequency structure
- antenna
- magnetic resonance
- frequency
- force generator
- 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
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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
- G01R33/28—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
- G01R33/3628—Tuning/matching of the transmit/receive coil
-
- 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
- G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
-
- 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
- G01R33/34084—Constructional details, e.g. resonators, specially adapted to MR implantable coils or coils being geometrically adaptable to the sample, e.g. flexible coils or coils comprising mutually movable parts
-
- 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
-
- 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
Abstract
Description
Die Erfindung betrifft eine Hochfrequenzstruktur, eine Hochfrequenzantenne mit der Hochfrequenzstruktur und ein Magnetresonanzgerät mit der Hochfrequenzantenne.The invention relates to a high-frequency structure, a radio frequency antenna with the radio frequency structure and a magnetic resonance device with the radio frequency antenna.
Die Magnetresonanztechnik ist eine bekannte Technik unter anderem zum Gewinnen von Bildern eines Körperinneren eines Untersuchungsobjekts. Dazu werden in einem Magnetresonanzgerät einem statischen Grundmagnetfeld, das von einem Grundfeldmagneten erzeugt wird, schnell geschaltete Gradientenfelder überlagert, die von einem Gradientenspulensystem erzeugt werden. Ferner umfasst das Magnetresonanzgerät ein Hochfrequenzsystem, das zum Auslösen von Magnetresonanzsignalen Hochfrequenzsignale in das Untersuchungsobjekt einstrahlt und die erzeugten Magnetresonanzsignale aufnimmt, auf deren Basis Magnetresonanzbilder erstellt werden.Magnetic resonance technology is one known technology, inter alia, for obtaining images of an interior of the body of an object under investigation. For this purpose, a static Basic magnetic field generated by a basic field magnet quickly switched gradient fields superimposed, generated by a gradient coil system. Also includes the magnetic resonance device a radio frequency system used to trigger magnetic resonance signals Radiofrequency signals in the object under examination and the generates generated magnetic resonance signals, on the basis of which magnetic resonance images to be created.
Für eine hohe Qualität von Magnetresonanzbildern ist es wichtig, dass Magnetresonanzsignale von Antennen des Hochfrequenzsystems mit einem hohen Signal-Rausch-Verhältnis aufgenommen werden. In einer Ausführungsform ist die Antenne als stationäre Antenne, beispielsweise als sogenannte Ganzkörperantenne ausgebildet, die als Sende- und als Empfangsantenne eingesetzt werden kann. Darüber hinaus werden zur Verbesserung des Signal-Rausch-Verhältnisses sogenannte Lokalantennen eingesetzt. Dabei handelt es sich um Antennen, die an die Größe eines zu untersuchenden Bereichs angepasst sind. So gibt es beispielsweise fest in eine Lagerungsvorrichtung des Magnetresonanzgeräts eingebaute oder an festen Positionen auf der Lagerungsvorrichtung einrastbare Lokalantennen, beispielsweise zur Untersuchung einer Wirbelsäule oder einer weiblichen Brust. Andererseits gibt es auch frei bewegliche Lokalantennen, zum Beispiel flexible Antennen und Extremitätenantennen. Die Lokalantenne kann in einer Ausführungsform als reine Empfangsantenne ausgebildet sein, wobei dann beispielsweise eine Ganzkörperantenne als Sendeantenne eingesetzt wird.For high quality of magnetic resonance images, it is important that magnetic resonance signals from Antennas of the high-frequency system with a high signal-to-noise ratio become. In one embodiment is the antenna as stationary Antenna, for example designed as a so-called whole-body antenna can be used as a transmitting and receiving antenna. Furthermore So-called local antennas are used to improve the signal-to-noise ratio used. These are antennas that are the size of a area to be examined are adapted. For example, there is permanently installed in a storage device of the magnetic resonance device or can be snapped into fixed positions on the storage device Local antennas, for example for examining a spine or a female breast. On the other hand, there are also free moving local antennas, for example flexible antennas and extremity antennas. The local antenna can in one embodiment be designed as a pure receiving antenna, in which case, for example, a Whole-body antenna is used as a transmitting antenna.
Zum Erzeugen von Gradientenfeldern sind in Gradientenspulen des Gradientenspulensystems entsprechende Ströme einzustellen. Dabei betragen die Amplituden der erforderlichen Ströme bis zu mehreren 100 A. Die Stromanstiegs- und -abfallraten betragen bis zu mehreren 100 kA/s. Auf diese sich zeitlich verändernden Ströme in den Gradientenspulen wirken bei vorhandenem Grundmagnetfeld in der Größenordnung von 1 T Lorentzkräfte, die zu an sich unerwünschten Schwingungen des Gradientenspulensystems führen.For generating gradient fields are corresponding in gradient coils of the gradient coil system streams adjust. The amplitudes of the required currents are up to several 100 A. The current rise and fall rates are up to to several 100 kA / s. On this changing over time streams in the gradient coils with an existing basic magnetic field in of the order of magnitude of 1 T Lorentz forces, the too undesirable in itself Vibrations of the gradient coil system.
In der
Eine Aufgabe der Erfindung ist es, eine verbesserte Hochfrequenzstruktur zu schaffen, die unter anderem derart steuerbar ist, dass eine von der Hochfrequenzstruktur beeinflusste Ausbildung einer Hochfrequenzfeldverteilung bewusst manipuliert werden kann.An object of the invention is to create an improved radio frequency structure, which among other things is controllable in such a way that one influenced by the high-frequency structure Training of a radio frequency field distribution can be manipulated deliberately can.
Die Aufgabe wird durch den Gegenstand des Anspruchs 1. gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben.The task is through the subject of claim 1. solved. Advantageous configurations are described in the subclaims.
Gemäß Anspruch 1 weist eine Hochfrequenzstruktur einen Krafterzeuger zum Einstellen einer vorgebbaren Form der Hochfrequenzstruktur auf.According to claim 1 has a high frequency structure a force generator for setting a predeterminable shape of the high-frequency structure on.
Dadurch, dass die Hochfrequenzstruktur mittels eines an ihr angebrachten Krafterzeugers in ihrer Form einstellbar ist, ist eine von der Hochfrequenzstruktur beeinflusste Ausbildung einer Hochfrequenzfeldverteilung bewusst manipulierbar, wodurch unter anderem ein Ausgleich von Fertigungstoleranzen der Hochfrequenzstruktur und insbesondere beim Einsatz in einem Magnetresonanzgerät ein vereinfachtes und präzises Magnetresonanztuning durchführbar ist.Because of the high frequency structure adjustable in shape by means of a force generator attached to it is an education influenced by the radio frequency structure a high-frequency field distribution can be manipulated deliberately, whereby among other things, a compensation of manufacturing tolerances of the high-frequency structure and especially when used in a magnetic resonance device, a simplified one and precise Magnetic resonance tuning feasible is.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus nachfolgender Beschreibung von Ausführungsbeispielen der Erfindung anhand der Figuren. Dabei zeigen:Other advantages, features and details of Invention result from the following description of exemplary embodiments the invention with reference to the figures. Show:
Die
Der Krafterzeuger
Durch Anlegen einer entsprechenden
elektrischen Spannung an die elektrostriktiven Aktoren ist ein Verformen
der flexiblen Lokalantenne
Die
Der Krafterzeuger
In einer Ausführungsform kann dabei eine Elektrodenstruktur,
beispielsweise in einer Ausbildung als Kupferbahnen, zum Ansteuern
der Aktoren
Die
In einer Ausführungsform kann dabei das reine
Steuern durch eine Rückkopplung
erweitert sein, was in
Die
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE2002128827 DE10228827A1 (en) | 2002-06-27 | 2002-06-27 | Magnetic resonance unit for patient imaging has integral electrostrictive actuators controlled by feedback from high frequency sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE2002128827 DE10228827A1 (en) | 2002-06-27 | 2002-06-27 | Magnetic resonance unit for patient imaging has integral electrostrictive actuators controlled by feedback from high frequency sensor |
Publications (1)
Publication Number | Publication Date |
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DE10228827A1 true DE10228827A1 (en) | 2004-01-22 |
Family
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DE2002128827 Ceased DE10228827A1 (en) | 2002-06-27 | 2002-06-27 | Magnetic resonance unit for patient imaging has integral electrostrictive actuators controlled by feedback from high frequency sensor |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10353343B3 (en) * | 2003-11-14 | 2005-08-25 | Siemens Ag | Magnetic resonance apparatus with a high-frequency screen lying on a reference potential |
DE102010023844A1 (en) * | 2010-06-15 | 2011-12-15 | Siemens Aktiengesellschaft | MR RF coils with modulable flexibility |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4314338A1 (en) * | 1993-04-30 | 1994-11-03 | Siemens Ag | Radio-frequency system of an MR (nuclear spin, NMR) tomography instrument with screening means for E field limitation |
DE4432747A1 (en) * | 1993-09-17 | 1995-03-23 | Hitachi Medical Corp | Magnetic-resonance (nuclear-spin) tomography instrument and method with noise attenuation |
US6025719A (en) * | 1997-11-07 | 2000-02-15 | Varian, Inc. | Nuclear magnetic resonance method and apparatus |
DE10065958A1 (en) * | 2000-07-18 | 2002-02-07 | Siemens Ag | Magnetic resonance device with an optical fiber with a Bragg grating |
-
2002
- 2002-06-27 DE DE2002128827 patent/DE10228827A1/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4314338A1 (en) * | 1993-04-30 | 1994-11-03 | Siemens Ag | Radio-frequency system of an MR (nuclear spin, NMR) tomography instrument with screening means for E field limitation |
DE4432747A1 (en) * | 1993-09-17 | 1995-03-23 | Hitachi Medical Corp | Magnetic-resonance (nuclear-spin) tomography instrument and method with noise attenuation |
US6025719A (en) * | 1997-11-07 | 2000-02-15 | Varian, Inc. | Nuclear magnetic resonance method and apparatus |
DE10065958A1 (en) * | 2000-07-18 | 2002-02-07 | Siemens Ag | Magnetic resonance device with an optical fiber with a Bragg grating |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10353343B3 (en) * | 2003-11-14 | 2005-08-25 | Siemens Ag | Magnetic resonance apparatus with a high-frequency screen lying on a reference potential |
US7068035B2 (en) | 2003-11-14 | 2006-06-27 | Siemens Aktiengesellschaft | Magnetic resonance apparatus with a detunable RF resonator |
DE102010023844A1 (en) * | 2010-06-15 | 2011-12-15 | Siemens Aktiengesellschaft | MR RF coils with modulable flexibility |
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