FI955808A - Akustinen suodatin - Google Patents

Akustinen suodatin Download PDF

Info

Publication number
FI955808A
FI955808A FI955808A FI955808A FI955808A FI 955808 A FI955808 A FI 955808A FI 955808 A FI955808 A FI 955808A FI 955808 A FI955808 A FI 955808A FI 955808 A FI955808 A FI 955808A
Authority
FI
Finland
Prior art keywords
acoustic filter
acoustic
filter
Prior art date
Application number
FI955808A
Other languages
English (en)
Swedish (sv)
Other versions
FI955808A0 (fi
FI114415B (fi
Inventor
Peter Mansfield
Barry Leonard Walter Chapman
Paul Martin Glover
Richard William Bowtell
Original Assignee
British Tech Group
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 British Tech Group filed Critical British Tech Group
Publication of FI955808A0 publication Critical patent/FI955808A0/fi
Publication of FI955808A publication Critical patent/FI955808A/fi
Application granted granted Critical
Publication of FI114415B publication Critical patent/FI114415B/fi

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
    • G01R33/42—Screening
    • G01R33/421—Screening of main or gradient magnetic 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
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
    • G01R33/3854—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils means for active and/or passive vibration damping or acoustical noise suppression in gradient magnet coil systems
    • 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
    • G01R33/421—Screening of main or gradient magnetic field
    • G01R33/4215—Screening of main or gradient magnetic field of the gradient magnetic field, e.g. using passive or active shielding of the gradient magnetic field

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
FI955808A 1993-06-02 1995-12-01 Akustinen suoja FI114415B (fi)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9311321 1993-06-02
GB939311321A GB9311321D0 (en) 1993-06-02 1993-06-02 Apparatus for and methods of acoustic and magnetic screening
PCT/GB1994/001187 WO1994028430A1 (en) 1993-06-02 1994-06-01 An acoustic screen
GB9401187 1994-06-01

Publications (3)

Publication Number Publication Date
FI955808A0 FI955808A0 (fi) 1995-12-01
FI955808A true FI955808A (fi) 1996-01-31
FI114415B FI114415B (fi) 2004-10-15

Family

ID=10736467

Family Applications (1)

Application Number Title Priority Date Filing Date
FI955808A FI114415B (fi) 1993-06-02 1995-12-01 Akustinen suoja

Country Status (9)

Country Link
US (1) US5764059A (fi)
EP (1) EP0701700B1 (fi)
JP (1) JP3748883B2 (fi)
CN (1) CN1127041A (fi)
DE (1) DE69428991T2 (fi)
FI (1) FI114415B (fi)
GB (2) GB9311321D0 (fi)
IL (1) IL109844A (fi)
WO (1) WO1994028430A1 (fi)

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581185A (en) * 1994-03-15 1996-12-03 Picker International, Inc. Torque-balanced gradient coils for magnetic resonance imaging
US5545996A (en) * 1994-03-15 1996-08-13 Picker International, Inc. Gradient coil with cancelled net thrust force
GB9506829D0 (en) * 1995-04-01 1995-05-24 Mansfield Peter Active acoustic screening for quiet gradient coils in mri
US5561371A (en) * 1995-09-27 1996-10-01 General Electric Company Transverse gradient coil
DE19612478C1 (de) * 1996-03-29 1997-09-04 Siemens Ag Gradientenspulensystem für ein diagnostisches Magnetresonanzgerät
US5942898A (en) * 1996-12-13 1999-08-24 Picker International, Inc. Thrust balanced bi-planar gradient set for MRI scanners
WO1999028757A1 (en) * 1997-11-28 1999-06-10 Koninklijke Philips Electronics N.V. Magnetic resonance apparatus provided with force-optimized gradient coils
DE19910018C1 (de) * 1999-03-08 2000-10-19 Siemens Ag Verfahren zum Betrieb eines Magnetresonanztomographiegeräts
US6462547B1 (en) * 1999-03-08 2002-10-08 Siemens Aktiengesellschaft Magnetic resonance tomography apparatus having a gradient coil system with a structural design wherein a scalar product of a natural oscillation mode and Lorentz forces is minimized toward zero
GB9923648D0 (en) * 1999-10-07 1999-12-08 Magnex Scient Limited Acoustic liner
GB2355799B (en) * 1999-10-26 2004-02-04 Oxford Magnet Tech Magnet with improved access
US6954068B1 (en) 2000-01-21 2005-10-11 Kabushiki Kaisha Toshiba Magnetic resonance imaging apparatus
US6556012B2 (en) 2000-01-21 2003-04-29 Kabushiki Kaisha Toshiba Magnetic resonance imaging apparatus
US6567685B2 (en) * 2000-01-21 2003-05-20 Kabushiki Kaisha Toshiba Magnetic resonance imaging apparatus
GB0006356D0 (en) * 2000-03-17 2000-05-03 Mansfield Peter Active acoustic control in gradient coil design for MRI
DE10116623C1 (de) * 2001-04-03 2002-12-05 Bruker Biospin Gmbh Magnetresonanzapparatur mit Dämpfung innerer mechanischer Schwingungen
DE10120284C1 (de) * 2001-04-25 2003-01-02 Siemens Ag Gradientenspulensystem und Magnetresonanzgerät mit dem Gradientenspulensystem
US6765381B2 (en) * 2001-08-10 2004-07-20 Varian, Inc. Extended maxwell pair gradient coils
US20030069710A1 (en) * 2001-09-24 2003-04-10 Earl Geddes Method for quantifying the polar response of transducers
DE10147474C1 (de) 2001-09-26 2003-04-24 Siemens Ag Makro-Multilayer-Spule und Verfahren zur Herstellung der Makro-Multilayer-Spule
US7565189B2 (en) * 2001-11-01 2009-07-21 Peter Mansfield MRI gradient coils with reduced neural stimulation
DE10200861A1 (de) * 2002-01-11 2003-07-31 Siemens Ag Magnetresonanzgerät mit einem Wirbelstromerzeuger
GB0223684D0 (en) * 2002-10-10 2002-11-20 Tesla Engineering Ltd Gradient coil structure for magnetic resonace imaging
AU2003274486A1 (en) * 2002-11-15 2004-06-15 Koninklijke Philips Electronics N.V. Mri system having a gradient magnet system with a balance member
DE10310356A1 (de) * 2003-03-10 2004-10-07 Siemens Ag Magnetresonanzgerät mit einem Grundfeldmagneten und wenigstens einer Gradientenspulen
US7068033B2 (en) * 2003-08-18 2006-06-27 Ge Medical Systems Global Technology Company, Llc Acoustically damped gradient coil
WO2005052624A1 (en) * 2003-11-25 2005-06-09 Koninklijke Philips Electronics N.V. Actively shielded gradient coil system comprising additional eddy current shield system
US20050127913A1 (en) * 2003-12-12 2005-06-16 Seth Berger Lc coil
FR2892523B1 (fr) * 2005-10-26 2008-02-22 Commissariat Energie Atomique Machine de rmn a compensation des courants de foucault.
US7579838B2 (en) * 2005-11-18 2009-08-25 General Electric Company Systems, methods and apparatus for a partially elongated field of view in a magnetic resonance imaging system
DE102007016314B3 (de) * 2007-04-04 2009-01-02 Siemens Ag Lokalspulenanordnung zum Aufsetzen auf eine Patientenliege und Patientenliege zur Aufnahme einer Lokalspulenanordnung sowie Magnetresonanzgerät mit einer Patientenliege
WO2011122929A1 (en) * 2010-03-30 2011-10-06 Sang Boon Lam Device and method of improving electricity
EP2388610A1 (en) 2010-05-20 2011-11-23 Koninklijke Philips Electronics N.V. Magnetic Resonance Imaging Gradient Coil, Magnet Assembly, and System
JP2012115456A (ja) * 2010-11-30 2012-06-21 Toshiba Corp 磁気共鳴イメージング装置
US8766635B2 (en) * 2011-06-30 2014-07-01 General Electric Company System and apparatus for balancing radial forces in a gradient coil
EP2748740A4 (en) * 2011-11-07 2015-12-16 Landmark Graphics Corp SEISMIC IMAGING SYSTEMS AND METHODS EMPLOYING A STACK BASED ON CORRELATION
US10527694B2 (en) 2015-11-12 2020-01-07 General Electric Company Magnetic resonance imaging system and an associated method thereof
CN106291421B (zh) * 2016-09-23 2023-06-30 山东大学 适用于台阶法施工中核磁共振超前地质预报的发射线圈
GB2594686B (en) * 2020-02-28 2023-11-29 Tesla Dynamic Coils BV MRI apparatus
CN112700942A (zh) * 2020-12-16 2021-04-23 苏州大学 电磁场平台及具有其的控制系统

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4680545A (en) * 1985-01-04 1987-07-14 General Electric Company Method for reduction of acoustical noise generated by magnetic field gradient pulses
NL8701947A (nl) * 1987-08-19 1989-03-16 Philips Nv Magnetisch resonantie apparaat met geluidsarme gradientspoel.
JPH01303140A (ja) * 1988-06-01 1989-12-07 Hitachi Ltd 核磁気共鳴診断装置
US5084676A (en) * 1988-12-23 1992-01-28 Hitachi, Ltd. Nuclear magnetic resonance apparatus
JPH0334404A (ja) * 1989-06-30 1991-02-14 Mitsubishi Electric Corp 極低温冷凍装置
DE4029477C2 (de) * 1989-09-29 1994-06-01 Siemens Ag Tesserale Gradientenspule für Kernspin-Tomographiegeräte
US5243286A (en) * 1990-06-06 1993-09-07 Advanced Nmr Systems, Inc. Split shield for magnetic resonance imaging
US5481191A (en) * 1990-06-29 1996-01-02 Advanced Nmr Systems, Inc. Shielded gradient coil for nuclear magnetic resonance imaging
JPH0479936A (ja) * 1990-07-23 1992-03-13 Shimadzu Corp 傾斜磁場発生装置
US5235283A (en) * 1991-02-07 1993-08-10 Siemens Aktiengesellschaft Gradient coil system for a nuclear magnetic resonance tomography apparatus which reduces acoustic noise
DE4141514C2 (de) * 1991-02-07 1997-04-10 Siemens Ag Gradientenspulensystem für ein Kernspin-Tomographiegerät
JP3161008B2 (ja) * 1992-03-18 2001-04-25 株式会社日立製作所 磁気共鳴イメージング装置
US5554929A (en) * 1993-03-12 1996-09-10 Doty Scientific, Inc. Crescent gradient coils
FR2704322B1 (fr) * 1993-04-20 1995-05-24 Gec Alsthom Electromec Système de bobines de gradient transverse pour appareil de résonance magnétique nucléaire.
EP0874389B1 (en) * 1997-04-21 2007-08-01 STMicroelectronics S.r.l. A method of producing MOSFET transistors by means of tilted implants

Also Published As

Publication number Publication date
CN1127041A (zh) 1996-07-17
GB2293454A (en) 1996-03-27
DE69428991T2 (de) 2002-04-04
EP0701700A1 (en) 1996-03-20
GB9311321D0 (en) 1993-07-21
DE69428991D1 (de) 2001-12-13
FI955808A0 (fi) 1995-12-01
FI114415B (fi) 2004-10-15
IL109844A (en) 1996-12-05
JP3748883B2 (ja) 2006-02-22
US5764059A (en) 1998-06-09
EP0701700B1 (en) 2001-11-07
WO1994028430A1 (en) 1994-12-08
IL109844A0 (en) 1994-10-07
JPH08510659A (ja) 1996-11-12
GB9522805D0 (en) 1996-01-10

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