JP2007289690A - 並列ｒｆ送信を伴うｍｒ撮像におけるｓａｒ低減 - Google Patents

並列ｒｆ送信を伴うｍｒ撮像におけるｓａｒ低減 Download PDF

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Publication number
JP2007289690A
JP2007289690A JP2007107706A JP2007107706A JP2007289690A JP 2007289690 A JP2007289690 A JP 2007289690A JP 2007107706 A JP2007107706 A JP 2007107706A JP 2007107706 A JP2007107706 A JP 2007107706A JP 2007289690 A JP2007289690 A JP 2007289690A
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computer
pulse
parallel
transmit coil
imaging
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JP2007107706A
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Japanese (ja)
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JP2007289690A5 (enExample
Inventor
Yudong Zhu
ユードン・ズ
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General Electric Co
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General Electric Co
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    • 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
    • G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
    • G01R33/583—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency
    • 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
    • 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
    • G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
    • G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
    • 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
    • G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
    • G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
    • G01R33/4836—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices using an RF pulse being spatially selective in more than one spatial dimension, e.g. a 2D pencil-beam excitation pulse
    • 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
    • G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
    • G01R33/5611—Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE
    • G01R33/5612—Parallel RF transmission, i.e. RF pulse transmission using a plurality of independent transmission channels
    • 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
    • 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
    • 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
    • G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
    • G01R33/5611—Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
JP2007107706A 2006-04-20 2007-04-17 並列ｒｆ送信を伴うｍｒ撮像におけるｓａｒ低減 Pending JP2007289690A (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/379,403 US7385396B2 (en) 2006-04-20 2006-04-20 SAR reduction in MR imaging with parallel RF transmission

Publications (2)

Publication Number Publication Date
JP2007289690A true JP2007289690A (ja) 2007-11-08
JP2007289690A5 JP2007289690A5 (enExample) 2011-05-26

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ID=38618899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007107706A Pending JP2007289690A (ja) 2006-04-20 2007-04-17 並列ｒｆ送信を伴うｍｒ撮像におけるｓａｒ低減

Country Status (3)

Country Link
US (1) US7385396B2 (enExample)
JP (1) JP2007289690A (enExample)
NL (1) NL1033706C2 (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009268904A (ja) * 2008-04-30 2009-11-19 General Electric Co <Ge> 並列励起パルスのスペクトルを最適化するための装置および方法
JP2011505955A (ja) * 2007-12-12 2011-03-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 超高磁場ｍｒｉ用の送受信コイル
JP2012522562A (ja) * 2009-04-01 2012-09-27 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ パラレルトランスミッションｍｒｉにおける時間平均によるｓａｒホットスポットの低減
JP2014518121A (ja) * 2011-07-04 2014-07-28 コーニンクレッカ フィリップス エヌ ヴェ 多チャネルインピーダンス整合ネットワークを備える磁気共鳴撮像システム
KR101480413B1 (ko) * 2012-12-04 2015-01-08 삼성전자주식회사 B1 정보 획득 방법 및 장치
US9625553B2 (en) 2012-12-04 2017-04-18 Samsung Electronics Co., Ltd. Method and apparatus for acquiring B1 magnetic field information

Families Citing this family (23)

* Cited by examiner, † Cited by third party
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DE102007059522B4 (de) * 2007-12-11 2009-09-17 Siemens Ag Magnetresonanzanlage mit verlustleistungsoptimiertem Betrieb
US8698495B2 (en) * 2008-03-27 2014-04-15 Koninklijke Philips N.V. Flip angle imaging with improved B1 mapping for multi-RF transmit systems
CN102159965B (zh) * 2008-09-17 2014-09-24 皇家飞利浦电子股份有限公司 用于mri的b1映射和b1l匀场
US8148985B2 (en) * 2008-10-15 2012-04-03 Massachusetts Institute Of Technology Method for reducing maximum local specific absorption rate in magnetic resonance imaging
US8319495B1 (en) 2008-10-27 2012-11-27 Yudong Zhu Multi-port RF systems and methods for MRI
US8311641B2 (en) * 2008-12-04 2012-11-13 General Electric Company Method and apparatus for generating a localized heating
DE102008061455B4 (de) * 2008-12-10 2011-03-17 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Bestimmung einer vorbestimmten Signalamplitude bei MR-Messungen
JP2010207568A (ja) * 2009-02-10 2010-09-24 Toshiba Corp 磁気共鳴イメージング装置
US8049499B2 (en) * 2009-03-20 2011-11-01 Case Western Reserve University Controlling multi-channel transmitter effects on specific absorption rate
US8319496B2 (en) * 2009-04-01 2012-11-27 Yigitcan Eryaman Magnetic resonance method and apparatus for reducing RF heating in the patient
EP2414858A1 (en) 2009-04-02 2012-02-08 Koninklijke Philips Electronics N.V. Sar reduction in parallel transmission by k-space dependent rf pulse selection
EP2296000B1 (en) * 2009-09-10 2014-03-12 Commissariat à l'Énergie Atomique et aux Énergies Alternatives Parallel excitation of nuclear spins with local SAR control
DE102010004514A1 (de) * 2010-01-13 2011-07-14 Siemens Aktiengesellschaft, 80333 Dynamische Nachführung der HF-Justage bei parallelem Senden
US8970217B1 (en) 2010-04-14 2015-03-03 Hypres, Inc. System and method for noise reduction in magnetic resonance imaging
WO2011149087A1 (ja) * 2010-05-27 2011-12-01 株式会社東芝 磁気共鳴イメージング装置
US8558547B2 (en) 2011-05-05 2013-10-15 General Electric Company System and method for magnetic resonance radio-frequency field mapping
US9702950B2 (en) * 2011-08-17 2017-07-11 Koninklijke Philips N.V. Reducing the radio-frequency transmit field in a predetermined volume during magnetic resonance imaging
EP2615470A1 (en) * 2012-01-12 2013-07-17 Koninklijke Philips Electronics N.V. MR imaging with B1 mapping
DE102012207132B3 (de) * 2012-04-27 2013-09-05 Siemens Aktiengesellschaft Ansteuerung eines Magnetresonanzsystems unter Ermittlung von Sendeskalierungsfaktoren für eine vorgegebene Zielmagnetisierung
JP6285448B2 (ja) 2012-10-23 2018-02-28 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 磁気共鳴画像診断システム及び磁気共鳴画像診断方法
JP6411063B2 (ja) * 2014-05-07 2018-10-24 キヤノンメディカルシステムズ株式会社 磁気共鳴イメージング装置及びｓａｒ算出方法
DE102016209088A1 (de) * 2016-05-25 2017-11-30 Siemens Healthcare Gmbh Überwachung einer Absorptionsrate induktiv gekoppelter Spulen
CN113093143B (zh) * 2021-04-15 2022-06-10 电子科技大学 基于共形频控阵mimo雷达的降维参数估计方法

Citations (3)

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JP2001070282A (ja) * 1999-09-08 2001-03-21 Ge Yokogawa Medical Systems Ltd スピン励起方法および装置並びに磁気共鳴撮像装置
JP2005152655A (ja) * 2003-11-26 2005-06-16 General Electric Co <Ge> Ｍｒデータ収集中のｒｆ電力蓄積を低減する方法及び装置
JP2005152657A (ja) * 2003-11-26 2005-06-16 General Electric Co <Ge> 送信コイルアレイを用いて望ましい励起プロフィールに一致するｒｆ励起を発生する方法及び装置

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DE10150138B4 (de) * 2001-10-11 2009-10-08 Siemens Ag Verfahren zur Magnetresonanz-Bildgebung
US6879158B2 (en) 2002-05-17 2005-04-12 General Electric Company Method for accelerating focused excitation with multiple RF transmit coils
US7307419B2 (en) 2004-12-20 2007-12-11 General Electric Company Method and system for spatial-spectral excitation by parallel RF transmission
US20060132132A1 (en) 2004-12-21 2006-06-22 General Electric Company Method and system for MR scan acceleration using selective excitation and parallel transmission

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001070282A (ja) * 1999-09-08 2001-03-21 Ge Yokogawa Medical Systems Ltd スピン励起方法および装置並びに磁気共鳴撮像装置
JP2005152655A (ja) * 2003-11-26 2005-06-16 General Electric Co <Ge> Ｍｒデータ収集中のｒｆ電力蓄積を低減する方法及び装置
JP2005152657A (ja) * 2003-11-26 2005-06-16 General Electric Co <Ge> 送信コイルアレイを用いて望ましい励起プロフィールに一致するｒｆ励起を発生する方法及び装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011505955A (ja) * 2007-12-12 2011-03-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 超高磁場ｍｒｉ用の送受信コイル
JP2009268904A (ja) * 2008-04-30 2009-11-19 General Electric Co <Ge> 並列励起パルスのスペクトルを最適化するための装置および方法
JP2012522562A (ja) * 2009-04-01 2012-09-27 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ パラレルトランスミッションｍｒｉにおける時間平均によるｓａｒホットスポットの低減
JP2014518121A (ja) * 2011-07-04 2014-07-28 コーニンクレッカ フィリップス エヌ ヴェ 多チャネルインピーダンス整合ネットワークを備える磁気共鳴撮像システム
KR101480413B1 (ko) * 2012-12-04 2015-01-08 삼성전자주식회사 B1 정보 획득 방법 및 장치
US9625553B2 (en) 2012-12-04 2017-04-18 Samsung Electronics Co., Ltd. Method and apparatus for acquiring B1 magnetic field information

Also Published As

Publication number Publication date
NL1033706A1 (nl) 2007-10-23
US20070247155A1 (en) 2007-10-25
US7385396B2 (en) 2008-06-10
NL1033706C2 (nl) 2009-06-10

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