JP2013240711A - 磁気共鳴撮像装置 - Google Patents
磁気共鳴撮像装置 Download PDFInfo
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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
- G01R33/28—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
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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
- G01R33/28—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
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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
- G01R33/28—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
- G01R33/3664—Switching for purposes other than coil coupling or decoupling, e.g. switching between a phased array mode and a quadrature mode, switching between surface coil modes of different geometrical shapes, switching from a whole body reception coil to a local reception coil or switching for automatic coil selection in moving table MR or for changing the field-of-view
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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
- G01R33/483—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
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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
- G01R33/483—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
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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
- G01R33/54—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
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Abstract
【解決手段】磁気共鳴撮像装置は、静磁場中の被検体に対し、傾斜磁場および高周波磁場を印加することにより被検体から放射される磁気共鳴信号に基づいて被検体を撮像するもので、発生手段、割り当て手段、送信用決定手段および制御手段を備える。発生手段は、高周波磁場を発生させるための送信高周波パルス信号をそれぞれ発生する。送信用コイル決定手段は、FOV(field of view)に応じて複数の高周波コイルのうちの1つまたは複数を送信用として決定する。制御手段は、送信用として決定された1つまたは複数の高周波コイルへと送信高周波パルス信号が供給されるように制御する。
【選択図】図1
Description
一般的には、FOV(field of view)が、アレイコイル7の感度領域内の限定された領域である場合には、FOVの内部および周辺を感度領域とするRFコイル71aのみを使用することが、SAR(specific absorption rate)を低減するためには望ましい。
合成ユニット8は、P組のそれぞれについて、各組に属するQ本の磁気共鳴信号を合成する。このとき、撮像領域をカバーするのに必要なRFコイル71aで受信された磁気共鳴信号のみ使用し、他のRFコイル71aに関する信号は合成処理に用いない。このとき、1つの組に属するQ本の磁気共鳴信号は、同一のRFコイル群71に属するRFコイル71aで得られたものである必要は無い。例えば、体軸方向に直交する方向に並んだ4つのRFコイル71aでそれぞれ得られた4本の磁気共鳴信号を合成しても良い。
Claims (5)
- 静磁場中の被検体に対し傾斜磁場および高周波磁場を印加することにより前記被検体から放射される磁気共鳴信号に基づいて前記被検体を撮像する磁気共鳴撮像装置において、
前記高周波磁場を発生させるための送信高周波パルス信号を発生する発生手段と、
FOV(field of view)に応じて、複数の前記高周波コイルのうちの1つまたは複数を送信用として決定する送信用コイル決定手段と、
送信用として決定された1つまたは複数の前記高周波コイルへと前記送信高周波パルス信号が供給されるように制御する制御手段とを具備したことを特徴とする磁気共鳴撮像装置。 - 前記発生手段は、複数の前記送信用高周波パルス信号を発生し、
前記送信用コイル決定手段は、前記高周波コイルのうち複数を送信用として決定することを特徴とする請求項1に記載の磁気共鳴撮像装置 - 前記高周波コイルのうちの複数を受信用として決定する受信用コイル決定手段と、
前記受信用として決定された複数の前記高周波コイルで受信された前記磁気共鳴信号に基づいて、前記受信用として決定された複数の前記高周波コイルの感度分布を求める算出手段とをさらに備えることを特徴とする請求項1または2に記載の磁気共鳴撮像装置。 - 前記送信用コイル決定手段は、複数の前記高周波コイルを送信用として決定し、
前記受信用コイル決定手段は、前記送信用として決定された複数の前記高周波コイルを受信用として決定し、
前記算出手段は、受信用として決定された複数の前記高周波コイルで受信された前記磁気共鳴信号に基づいて、前記受信用として決定された複数の前記高周波コイルの感度分布を求めることを特徴とする請求項3に記載の磁気共鳴撮像装置。 - 前記受信用として決定された複数の高周波コイルのそれぞれで、前記感度分布を求めた後に受信された前記磁気共鳴信号に対し、前記感度分布を用いた行列演算を行うパラレルイメージング法により画像を得る手段をさらに備えることを特徴とする請求項4に記載の磁気共鳴撮像装置。
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Families Citing this family (16)
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JP5379997B2 (ja) * | 2007-05-01 | 2013-12-25 | 株式会社東芝 | 磁気共鳴撮像装置および磁気共鳴撮像方法 |
JP5342243B2 (ja) * | 2009-01-06 | 2013-11-13 | 株式会社東芝 | 磁気共鳴装置 |
EP2548503A1 (en) | 2010-05-27 | 2013-01-23 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging device |
RU2562978C2 (ru) * | 2010-07-08 | 2015-09-10 | Конинклейке Филипс Электроникс Н.В. | Маршрутизатор и матрица катушек для мрт со сверхвысокой напряженностью поля |
FR2978250B1 (fr) * | 2011-07-20 | 2014-11-21 | Commissariat Energie Atomique | Procede de realisation d’un module compact de pilotage d’une antenne haute frequence pour appareil d’imagerie par resonnance magnetique nucleaire |
DE102011079564B4 (de) * | 2011-07-21 | 2015-11-19 | Siemens Ag | MRT Lokalspule |
WO2013171611A1 (en) * | 2012-05-14 | 2013-11-21 | Koninklijke Philips N.V. | Feeding circuit arrangement for supplying a radio frequency signal to a plurality of coil elements of a magnetic resonance coil system |
CN103926545B (zh) | 2013-01-10 | 2017-09-19 | 西门子(深圳)磁共振有限公司 | 一种发射天线选择器和磁共振成像*** |
DE102013206325A1 (de) * | 2013-04-10 | 2014-10-16 | Siemens Aktiengesellschaft | Magnetresonanzanlage mit gruppenweiser Ansteuerung von Sendeantennen |
CN104459583B (zh) * | 2013-09-16 | 2017-11-17 | 西门子(深圳)磁共振有限公司 | 一种磁共振装置的局部线圈的定位方法、装置和*** |
DE102016213579A1 (de) * | 2016-07-25 | 2018-01-25 | Siemens Healthcare Gmbh | Magnetresonanztomograph mit Sendeeinheit und Selektor sowie Verfahren zum Betrieb |
JP6923400B2 (ja) * | 2017-09-12 | 2021-08-18 | キヤノンメディカルシステムズ株式会社 | 高周波増幅器及び磁気共鳴イメージング装置 |
CN110794349B (zh) * | 2018-08-02 | 2022-05-20 | 西门子(深圳)磁共振有限公司 | 头颈线圈、射频信号处理方法和磁共振成像装置 |
EP3644085A1 (de) * | 2018-10-25 | 2020-04-29 | Siemens Healthcare GmbH | Auswahl von messspulen bei der magnetresonanz-bildgebung |
CN112545485B (zh) * | 2020-11-30 | 2023-08-15 | 上海联影医疗科技股份有限公司 | 一种磁共振扫描方法、装置、设备及存储介质 |
CN114062989B (zh) * | 2021-11-11 | 2023-12-15 | 上海电气(集团)总公司智惠医疗装备分公司 | 磁共振波谱仪及磁共振成像*** |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0565179B2 (ja) * | 1990-05-31 | 1993-09-17 | Tokyo Shibaura Electric Co | |
JP2003334177A (ja) * | 2001-12-14 | 2003-11-25 | Toshiba Corp | Mr信号受信装置及び磁気共鳴イメージング装置 |
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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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5066914A (en) * | 1990-03-26 | 1991-11-19 | General Electric Company | Gradient amplifier system with flexible amplifier allocation |
US20010045832A1 (en) * | 1997-11-26 | 2001-11-29 | Kenneth W. Belt | Peripheral vascular array |
US6969992B2 (en) * | 2003-10-03 | 2005-11-29 | Regents Of The University Of Minnesota | Parallel transceiver for nuclear magnetic resonance system |
US6982554B2 (en) * | 2004-04-29 | 2006-01-03 | General Electric Company | System and method for operating transmit or transmit/receive elements in an MR system |
JP5179019B2 (ja) | 2006-04-04 | 2013-04-10 | 株式会社日立製作所 | コイル装置およびそれを用いた核磁気共鳴撮像装置 |
JP2008246192A (ja) * | 2007-03-08 | 2008-10-16 | Toshiba Corp | 磁気共鳴撮像装置 |
US7535230B2 (en) * | 2007-03-08 | 2009-05-19 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
JP5379997B2 (ja) * | 2007-05-01 | 2013-12-25 | 株式会社東芝 | 磁気共鳴撮像装置および磁気共鳴撮像方法 |
US7508214B2 (en) * | 2007-05-21 | 2009-03-24 | Medrad, Inc. | Transmit-mode phased array coils for reduced SAR and artifact issues |
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- 2008-04-30 CN CN2008100962044A patent/CN101297755B/zh active Active
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0565179B2 (ja) * | 1990-05-31 | 1993-09-17 | Tokyo Shibaura Electric Co | |
JP2003334177A (ja) * | 2001-12-14 | 2003-11-25 | Toshiba Corp | Mr信号受信装置及び磁気共鳴イメージング装置 |
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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