WO2008125505A1 - Arrangement de blindage - Google Patents

Arrangement de blindage Download PDF

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Publication number
WO2008125505A1
WO2008125505A1 PCT/EP2008/053988 EP2008053988W WO2008125505A1 WO 2008125505 A1 WO2008125505 A1 WO 2008125505A1 EP 2008053988 W EP2008053988 W EP 2008053988W WO 2008125505 A1 WO2008125505 A1 WO 2008125505A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
arrangement according
stray field
frequency
dimensioned
Prior art date
Application number
PCT/EP2008/053988
Other languages
German (de)
English (en)
Inventor
Matthias Drobnitzky
Ludwig Eberler
Wolfgang Renz
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2008125505A1 publication Critical patent/WO2008125505A1/fr

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
    • 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
    • G01R33/42—Screening
    • G01R33/422—Screening of the radio frequency field
    • 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
    • G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room

Definitions

  • the invention relates to an arrangement for shielding according to the preamble of claim 1.
  • Magnetic resonance examination devices are usually arranged in so-called "high-frequency screen cabins" whose walls are usually equipped with metal or metal foils. These reflect high-frequency stray fields occurring during the examination, so that a field strength reduction is achieved outside the screen cabin.
  • Magnetic resonance device that emits a high-frequency stray field during operation, arranged in a spatial area.
  • Spatial region has an arrangement which is designed to absorb the high-frequency stray field.
  • FIG. 2 shows an exemplary second embodiment of the present invention.
  • FIG. 1 shows an exemplary first embodiment of the present invention.
  • a magnetic resonance device MRG which emits a high-frequency stray field SF during operation, is arranged in a spatial region RB.
  • the spatial area RB is an examination room or a screen cabin of the type described above.
  • the spatial area RB has an arrangement KS or K, which is designed to absorb the high-frequency stray field SF.
  • the absorbent assembly K or KS comprises, for example, an electrically conductive, low-reflection, damping material, which preferably contains carbon.
  • a mat-shaped configured absorbent material KS is used for absorption of the stray field SF to the bottom or to the ceiling.
  • the absorbent material for example, is additionally shaped conically or pyramidally or in a comparable manner and arranged on the walls - here referred to as a molded material KS.
  • KS truncated cone, truncated pyramid, cylindrical, spherical or respective mixed forms thereof.
  • the conical shape, pyramid shape, etc. is dimensioned such that due to the geometry of an absorption of the stray field.
  • the dimensioning is done, for example, matched to the operating frequency of the magnetic resonance device, which typically forms the stray field via the body coil antenna arrangement.
  • the cone structure or the mat structure is dimensioned for additional absorption of sound waves.
  • the absorbent material at least partially covers the spatial area, preferably the entire space is provided with the absorbent material in a planar manner.
  • 2 shows an exemplary second embodiment of the present invention.
  • An absorbing arrangement KA here comprises frequency-selective resonant circuits RK, which are dimensioned to absorb the high-frequency stray field SF.
  • RK frequency-selective resonant circuits
  • the above-described absorbent material KS can additionally be used.
  • the frequency-selective resonant circuits RK are configured, for example, similar to RFID components that are used in the

Abstract

L'invention concerne un arrangement de blindage avec lequel un appareil à résonance magnétique qui, en fonctionnement, émet un champ de fuite à haute fréquence, est disposé dans une zone tridimensionnelle. La zone tridimensionnelle présente un arrangement qui est configuré pour absorber le champ de fuite à haute fréquence.
PCT/EP2008/053988 2007-04-13 2008-04-03 Arrangement de blindage WO2008125505A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007017533.9 2007-04-13
DE200710017533 DE102007017533A1 (de) 2007-04-13 2007-04-13 Anordnung zur Abschirmung

Publications (1)

Publication Number Publication Date
WO2008125505A1 true WO2008125505A1 (fr) 2008-10-23

Family

ID=39577671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/053988 WO2008125505A1 (fr) 2007-04-13 2008-04-03 Arrangement de blindage

Country Status (2)

Country Link
DE (1) DE102007017533A1 (fr)
WO (1) WO2008125505A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01102999A (ja) * 1987-10-16 1989-04-20 Hitachi Medical Corp 核磁気共鳴イメージング装置用電磁波シールド室
GB2360094A (en) * 2000-03-06 2001-09-12 Marconi Caswell Ltd RF screens for MRI
US20010024121A1 (en) * 2000-03-27 2001-09-27 Tdk Corporation Electromagnetic wave absorber
US20030016518A1 (en) * 2001-07-16 2003-01-23 Winfried Arz Shielded compartment for a magnetic resonance apparatus
WO2005043181A1 (fr) * 2003-10-29 2005-05-12 Koninklijke Philips Electronics N.V. Chambre de traitement blindee et dispositif permettant d'enregistrer des images obtenues par resonance magnetique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1261912B (de) * 1962-03-29 1968-02-29 Siemens Ag Kastenfoermiger abgeschirmter Messraum zur Messung von elektromagnetischen oder akustischen Wellen
DE3131137C2 (de) * 1981-08-06 1985-10-03 Dieter Dipl.-Ing. Busch Vorrichtung zur Abschirmung und Absorption von elektromagnetischen Feldern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01102999A (ja) * 1987-10-16 1989-04-20 Hitachi Medical Corp 核磁気共鳴イメージング装置用電磁波シールド室
GB2360094A (en) * 2000-03-06 2001-09-12 Marconi Caswell Ltd RF screens for MRI
US20010024121A1 (en) * 2000-03-27 2001-09-27 Tdk Corporation Electromagnetic wave absorber
US20030016518A1 (en) * 2001-07-16 2003-01-23 Winfried Arz Shielded compartment for a magnetic resonance apparatus
WO2005043181A1 (fr) * 2003-10-29 2005-05-12 Koninklijke Philips Electronics N.V. Chambre de traitement blindee et dispositif permettant d'enregistrer des images obtenues par resonance magnetique

Also Published As

Publication number Publication date
DE102007017533A1 (de) 2008-10-23

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