DE102006001092A1 - Multi-channel coat line trap for prevention of interferences in magnetic resonance device, has coat line trap leads, which are wound together into coil with one winding and metal body is provided, whose distance can be changed - Google Patents
Multi-channel coat line trap for prevention of interferences in magnetic resonance device, has coat line trap leads, which are wound together into coil with one winding and metal body is provided, whose distance can be changed Download PDFInfo
- Publication number
- DE102006001092A1 DE102006001092A1 DE200610001092 DE102006001092A DE102006001092A1 DE 102006001092 A1 DE102006001092 A1 DE 102006001092A1 DE 200610001092 DE200610001092 DE 200610001092 DE 102006001092 A DE102006001092 A DE 102006001092A DE 102006001092 A1 DE102006001092 A1 DE 102006001092A1
- Authority
- DE
- Germany
- Prior art keywords
- coil
- line trap
- metal body
- channel
- coat line
- 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
-
- 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
- G01R33/3685—Means for reducing sheath currents, e.g. RF traps, baluns
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/005—Inductances without magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
- H01F21/10—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by means of a movable shield
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H2007/013—Notch or bandstop filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2210/00—Indexing scheme relating to details of tunable filters
- H03H2210/01—Tuned parameter of filter characteristics
- H03H2210/012—Centre frequency; Cut-off frequency
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2210/00—Indexing scheme relating to details of tunable filters
- H03H2210/01—Tuned parameter of filter characteristics
- H03H2210/015—Quality factor or bandwidth
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Mehrkanal-Mantelwellensperre mit einer Anzahl von Mantelwellensperrenleitern, die der Kanalanzahl entspricht, wobei die Mantelwellensperrenleiter elektrisch isoliert zueinander angeordnet sind.The The present invention relates to a multi-channel standing wave trap of a number of standing wave barrier conductors, which corresponds to the number of channels, wherein the sheath wave barrier conductors are electrically insulated from each other are arranged.
Bei medizinischen Magnetresonanzuntersuchungen werden Magnetresonanzsignale eines zu untersuchenden Patienten häufig mittels nahe am Patienten positionierten Lokalspulen empfangen. Die von den Lokalspulen empfangenen Magnetresonanzsignale werden dann über Signalleitungen zu den Auswerteeinheiten des Magnetresonanzgeräts übertragen. Zur Vermeidung von Störungen durch Hochfrequenz-Einkopplungen werden die Signalleitungen abgeschirmt, beispielsweise sind die Signalleitungen als Koaxialleitungen ausgeführt. Allerdings besteht bei dem Einsatz der Koaxialleitungen das Problem, dass sich auf dem Schirmleiter Mantelwellen und Mantelwellenströme ausbreiten können, die ihrerseits Störungen verursachen. Große Mantelwellenströme können beispielsweise zu einer Gefährdung des Patienten führen oder auch Baugruppen stören. Eine Möglichkeit zur Verhinderung solcher Störungen ist der Einsatz von Mantelwellensperren. Diese können beispielsweise durch Wickeln eines Teils des Koaxialkabels zu einer Spule und Parallelschalten eines kapazitiven Elements mit dem Mantelleiter gebildet werden. Durch eine entsprechende Wahl der die Resonanz bestimmenden Elemente kann der Parallelschwingkreis auf die Frequenz der zu unterdrückenden Mantelwellenströme abgestimmt werden. Im Resonanzfall stellt so der Parallelschwingkreis eine hohe Impedanz für die Mantelwellen dar.at Medical magnetic resonance examinations are magnetic resonance signals Often a patient to be examined by means of close to the patient receive positioned local coils. Those received by the local coils Magnetic resonance signals are then sent via signal lines to the Transfer evaluation of the magnetic resonance device. To avoid disorders high-frequency couplings shield the signal lines, For example, the signal lines are designed as coaxial lines. However, there is when using the coaxial cables the problem that arises propagate the shield conductor sheath shafts and sheath currents can, which in turn disturbances cause. Size Sheath wave currents can for example, to a hazard lead the patient or disrupt assemblies. A possibility to prevent such disorders is the use of standing wave barriers. These can, for example, by winding a portion of the coaxial cable to a coil and parallel a capacitive element with the sheath conductor are formed. By an appropriate choice of the resonance determining elements can the parallel resonant circuit to the frequency of the suppressed Sheath wave currents be matched. In the case of resonance, so does the parallel resonant circuit a high impedance for the sheath waves.
Eine
Mehrkanal-Mantelwellensperre der eingangs genannten Art ist aus
der
Der Erfindung liegt nun die Aufgabe zugrunde, eine einfach aufgebaute und störunanfällige Mehrkanal-Mantelwellensperre anzugeben, die zudem noch einfach auf die Sperrfrequenz abstimmbar ist.Of the The invention is based on the object, a simply constructed and interference-prone multichannel sheath wave barrier also be easily tuned to the blocking frequency.
Die Aufgabe wird mit dem Gegenstand des Anspruchs 1 gelöst. Demgemäß ist vorgesehen, bei einer Mehrkanal-Mantelwellensperre der eingangs genannten Art die Mantelwellensperrenleiter gemeinsam zu einer Spule mit mindestens einer Windung zu wickeln und einen Metallkörper vorzusehen, dessen Abstand zu der mindestens einen Windung veränderbar ist. Die Spule mit den Mantelwellensperrenleitern wird zunächst so dimensioniert, dass ihre Resonanzfrequenz als Parallelschwingkreis etwas höher liegt als die einzustellende Sperrfrequenz. Durch Annäherung des Metallkörpers wird die Dämpfung des Schwingkreises erhöht und damit die Resonanzfrequenz so weit erniedrigt, bis diese auf die Sperrfrequenz eingestellt ist. Durch die Gegeninduktivität der Mantelwellensperrenleiter zueinan der erfolgt die Einstellung auf die Sperrfrequenz für alle Mantelwellenkanäle mit einem einzigen Justagevorgang.The The object is achieved with the subject matter of claim 1. Accordingly, it is provided in a multi-channel sheath wave barrier of the type mentioned the sheath wave barrier conductor together to form a coil with at least to wind a turn and provide a metal body whose distance to the at least one turn is changeable. The coil with the Sheath wave barrier conductors is initially dimensioned so that their resonant frequency as a parallel resonant circuit is slightly higher than the blocking frequency to be set. By approaching the metal body becomes the damping of the resonant circuit increases and thus the resonance frequency is lowered until this on the blocking frequency is set. Due to the mutual inductance of the sheath wave barrier conductor zueinan the adjustment is made to the cutoff frequency for all mantle wave channels with a single adjustment process.
Vorteilhafte Ausgestaltungen der Erfindung sind durch die Unteransprüche gekennzeichnet.advantageous Embodiments of the invention are characterized by the subclaims.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Figur erläutert.following is an embodiment of Invention explained with reference to a figure.
Die
Figur zeigt in einer schematischen Darstellung den Aufbau einer
Mehrkanal-Mantelwellensperre mit einer Abstimmschraube. Die Mehrkanal-Mantelwellensperre
umfasst eine Mehrzahl von Mantelwellensperrenleitern L1–LN, die
elektrisch isoliert voneinander angeordnet sind. Die Mantelwellensperrenleiter
L1–LN
bestehen aus einzelnen, isolierten Koaxialleitungen mit einem Innen-
oder Signalleiter
Alle
Mantelwellensperrenleiter L1–LN
sind gemeinsam als Bündel
zu einer Spule
Zusätzlich kann noch zur Festlegung der Resonanzfrequenz ein Kondensator in bekannter Art den Mantelwellenleitern L1–LN parallel geschaltet werden.In addition, can still laying down the resonant frequency of a capacitor in known Type of sheath waveguides L1-LN be switched in parallel.
Zum
Abstimmen die Mehrkanal-Mantelwellensperre auf die vorgesehene Sperrfrequenz
ist eine Abstimmschraube
Die
Dimensionierung der Mantelwellensperre erfolgt derart, dass die
Sperrfrequenz der Mantelwellensperre ohne Abstimmschraube
Es
ist auch eine Ausführung
der Mantelwellensperre mit einem Spulenträger (hier nicht dargestellt)
möglich.
Dann ist im Spulenträger
ein entsprechendes Gewinde zum Eindrehen der Abstimmschraube
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610001092 DE102006001092A1 (en) | 2006-01-09 | 2006-01-09 | Multi-channel coat line trap for prevention of interferences in magnetic resonance device, has coat line trap leads, which are wound together into coil with one winding and metal body is provided, whose distance can be changed |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610001092 DE102006001092A1 (en) | 2006-01-09 | 2006-01-09 | Multi-channel coat line trap for prevention of interferences in magnetic resonance device, has coat line trap leads, which are wound together into coil with one winding and metal body is provided, whose distance can be changed |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006001092A1 true DE102006001092A1 (en) | 2007-07-05 |
Family
ID=38135864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200610001092 Ceased DE102006001092A1 (en) | 2006-01-09 | 2006-01-09 | Multi-channel coat line trap for prevention of interferences in magnetic resonance device, has coat line trap leads, which are wound together into coil with one winding and metal body is provided, whose distance can be changed |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102006001092A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH489167A (en) * | 1967-10-26 | 1970-04-15 | Bichler Bernhard | Lock-out circuit for television reception |
DE2511506C3 (en) * | 1975-03-15 | 1979-10-18 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Coupling network with two coupled lines |
US6320385B1 (en) * | 1999-09-17 | 2001-11-20 | Picker International, Inc. | Multi-channel balun for magnetic resonance apparatus |
US20030094950A1 (en) * | 2001-11-20 | 2003-05-22 | Philips Medical Systems (Cleveland), Inc. | Multi-channel rf cable trap for magnetic resonance apparatus |
WO2005069028A1 (en) * | 2004-01-14 | 2005-07-28 | Koninklijke Philips Electronics, N.V. | Rf trap tuned by selectively inserting electrically conductive tuning elements |
-
2006
- 2006-01-09 DE DE200610001092 patent/DE102006001092A1/en not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH489167A (en) * | 1967-10-26 | 1970-04-15 | Bichler Bernhard | Lock-out circuit for television reception |
DE2511506C3 (en) * | 1975-03-15 | 1979-10-18 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Coupling network with two coupled lines |
US6320385B1 (en) * | 1999-09-17 | 2001-11-20 | Picker International, Inc. | Multi-channel balun for magnetic resonance apparatus |
US20030094950A1 (en) * | 2001-11-20 | 2003-05-22 | Philips Medical Systems (Cleveland), Inc. | Multi-channel rf cable trap for magnetic resonance apparatus |
WO2005069028A1 (en) * | 2004-01-14 | 2005-07-28 | Koninklijke Philips Electronics, N.V. | Rf trap tuned by selectively inserting electrically conductive tuning elements |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE102009015699A1 (en) | Broadband antenna | |
DE102007026965A1 (en) | antenna array | |
EP0303879B1 (en) | Local coil for the nmr examination of an object | |
DE102005013853B4 (en) | Magnetic resonance system with a high-frequency transmitting antenna | |
DE102008011144B4 (en) | Antenna arrangement for a magnetic resonance apparatus | |
DE112010000731T5 (en) | INTERNAL FM ANTENNA | |
DE102010042280B4 (en) | Balancing element for converting a symmetrical high-frequency signal into an asymmetrical high-frequency signal | |
DE10105984C1 (en) | Coaxial cable and magnetic resonance system with such a coaxial cable | |
EP2620958A1 (en) | Shielding device for an electrically conductive connection element | |
DE4418202C1 (en) | Standing-wave trap | |
DE10107867A1 (en) | Magnetic resonance imaging device with an open magnet system | |
DE10211535A1 (en) | Standing wave trap | |
DE102013201685B4 (en) | Conductor arrangement with dielectric sheath wave barrier | |
DE102006001092A1 (en) | Multi-channel coat line trap for prevention of interferences in magnetic resonance device, has coat line trap leads, which are wound together into coil with one winding and metal body is provided, whose distance can be changed | |
DE102004015856B4 (en) | Standing wave trap unit | |
DE102018109540A1 (en) | Coil and device for wireless signal transmission and a method for producing such a coil | |
DE102006001091A1 (en) | Multi channel core spindle lock for use in medical field, has resonance unit, which is connected with conductors by inductive and capacitive coupling units, where conductors are formed as insulated coaxial cables | |
DE19627027C1 (en) | Sheath wave trap for movable cable especially of NMR local antenna | |
DE3309405C2 (en) | Receiving antenna for ultrashort waves | |
EP1401051A1 (en) | Antenna system for multiple frequency bands | |
EP1333454B1 (en) | Overvoltage protection device | |
DE102004044432B4 (en) | Circuit arrangement for a magnetic resonance apparatus | |
DE102008029373A1 (en) | Antenna structure for a magnetic resonance device | |
WO2022038003A1 (en) | Antenna | |
DE4302929C1 (en) | Wide band repeater coil with two coaxial windings - connected in series with same winding sense to connection point forming induction coil output |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |