JP6061846B2 - 超高磁場mriのルータ及びコイルアレイ - Google Patents
超高磁場mriのルータ及びコイルアレイ Download PDFInfo
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- 239000004020 conductor Substances 0.000 claims description 92
- 230000005284 excitation Effects 0.000 claims description 34
- 230000008878 coupling Effects 0.000 claims description 29
- 238000010168 coupling process Methods 0.000 claims description 29
- 238000005859 coupling reaction Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 8
- 238000001646 magnetic resonance method Methods 0.000 claims 2
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- 238000002595 magnetic resonance imaging Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
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- 239000003989 dielectric material Substances 0.000 description 1
- 210000003414 extremity Anatomy 0.000 description 1
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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
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
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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
-
- 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
- G01R33/3607—RF waveform generators, e.g. frequency generators, amplitude-, frequency- or phase modulators or shifters, pulse programmers, digital to analog converters for the RF signal, means for filtering or attenuating of the RF signal
-
- 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
- G01R33/28—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
- G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
-
- 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
- G01R33/3678—Electrical details, e.g. matching or coupling of the coil to the receiver involving quadrature drive or detection, e.g. a circularly polarized RF magnetic field
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- Condensed Matter Physics & Semiconductors (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
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- High Energy & Nuclear Physics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
Claims (9)
- 複数の送信チャネルの各々にユニークなB1励起信号を生成する無線周波数(RF)増幅器;
前記の生成された励起信号を検査領域内へ送信し該検査領域から磁気共鳴信号を受信する複数のコイル要素を有する少なくとも1つのRFコイル組立体;
それぞれ前記RF増幅器を前記少なくとも1つのRFコイル組立体に送受信ポートを介して結合する複数の結合パネルであって、各送受信ポートは、少なくとも1つの導電体を個々の送信チャネルに結合する、複数の結合パネル;
生成された励起信号を対応する送信チャネルを介して、前記複数の結合パネルのうちの如何なるものの少なくとも1つの送受信ポートへ選択的にルーティングするルータ;
を有する磁気共鳴システムにおいて、前記各コイル要素は、1対の直交B1磁場を生成し及び検査領域内で対応する共鳴周波数の磁気共鳴信号を受信するよう個別共鳴モードで動作する少なくとも2つの導電体を有し、
各コイル要素は:
(i)正弦波モード導電体であって、該導電体の平面に平行に向けられた第1のB 1 磁場を生成する正弦波電流共鳴モードに合わせられた正弦波モード導電体;
(ii)少なくとも1つの均一モード導電体であって、該導電体の面外に向けられた第2のB 1 磁場を生成する均一電流共鳴モードに合わせられた少なくとも1つの均一モード導電体;
のうちの少なくとも1つを有する、磁気共鳴システム。 - 各要素は、少なくとも2つの均一モード導電体が正弦波モード導電体により囲まれた、複数の環状の、概ね共面の導電体を有する、請求項1に記載の磁気共鳴システム。
- 前記ルータは:
送受信スイッチのアレイであって、それぞれ単一の送受信ポートに対応し、各送受信ポートを送信チャネルと受信チャネルとの間で選択的に切り替える、送受信スイッチのアレイ;
を有する、請求項1乃至2のいずれか一項に記載の磁気共鳴システム。 - 前記ルータは:
各送信チャネルを前記複数の送受信スイッチのうちの少なくとも1つの間で選択的に切り替えるRFスイッチ;
を更に有する、請求項3に記載の磁気共鳴システム。 - 前記送信チャネルは:
狭帯域信号を少なくとも1つの対応する送受信ポートへ渡すアイソレータ;
前記の対応するアイソレータを選択的にバイパスして広帯域信号を前記対応する送受信ポートへ渡すバイパス;
を有する、請求項1乃至4のいずれか一項に記載の磁気共鳴システム。 - 検査領域内に静止磁場を生成する磁石;
生成された磁気共鳴信号を前記無線周波数コイル組立体から受信する無線周波数受信機;
前記RF増幅器、ルータ及びバイパスを選択された磁気共鳴シーケンスに従って制御する走査制御部;
を更に有する請求項1乃至5のいずれか一項に記載の磁気共鳴システム。 - 無線周波数(RF)増幅器の複数の送信チャネルの各々にユニークな励起信号を生成するステップ;
少なくとも1つのRFコイル組立体の複数のコイル要素で、前記の生成された励起信号を検査領域内へ送信し該検査領域から磁気共鳴信号を受信するステップ;
前記RF増幅器を前記少なくとも1つのRFコイル組立体に複数の結合パネルのうちの1つの送受信ポートを介して結合するステップであって、各送受信ポートは、少なくとも1つの導電体を個々の送信チャネルに結合する、ステップ;
生成された励起信号を対応する送信チャネルを介して、前記複数の結合パネルのうちの如何なるものの少なくとも1つの送受信ポートへ選択的にルーティングするステップ;
を有する磁気共鳴方法において、前記各コイル要素は、1対の直交B1磁場を生成し及び対応する共鳴周波数で磁気共鳴信号を受信するよう個別共鳴モードで動作する少なくとも2つの導電体を有し、
各コイル要素は:
(i)正弦波モード導電体であって、該導電体の平面に平行に向けられた第1のB 1 磁場を生成する正弦波電流共鳴モードに合わせられた正弦波モード導電体;
(ii)少なくとも1つの均一モード導電体であって、該導電体の面外に向けられた第2のB 1 磁場を生成する均一電流共鳴モードに合わせられた少なくとも1つの均一モード導電体;
を有する、磁気共鳴方法。 - 各コイル要素は、均一モード導電体が正弦波モード導電体と同心円状に配置された、1対の環状の、概ね共面の導電体を有する、請求項7に記載の方法。
- 各コイル要素は、少なくとも2つの均一モード導電体が正弦波モード導電体により囲まれた、複数の環状の、概ね共面の導電体を有する、請求項7に記載の方法。
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US36234010P | 2010-07-08 | 2010-07-08 | |
US61/362,340 | 2010-07-08 | ||
PCT/IB2011/052950 WO2012004728A2 (en) | 2010-07-08 | 2011-07-04 | Router and coil array for ultra high field mri |
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JP6061846B2 true JP6061846B2 (ja) | 2017-01-18 |
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US (1) | US10254360B2 (ja) |
EP (1) | EP2591376B1 (ja) |
JP (1) | JP6061846B2 (ja) |
CN (1) | CN102985839B (ja) |
RU (1) | RU2562978C2 (ja) |
WO (1) | WO2012004728A2 (ja) |
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KR101435878B1 (ko) | 2012-12-06 | 2014-09-01 | 삼성전자주식회사 | 자기 공명 영상 (mri) 시스템에서 영상을 획득하는 방법 및 장치 |
DE102013206325A1 (de) * | 2013-04-10 | 2014-10-16 | Siemens Aktiengesellschaft | Magnetresonanzanlage mit gruppenweiser Ansteuerung von Sendeantennen |
US10191128B2 (en) | 2014-02-12 | 2019-01-29 | Life Services, LLC | Device and method for loops-over-loops MRI coils |
CN104515963B (zh) * | 2014-12-19 | 2017-02-08 | 中国科学院深圳先进技术研究院 | 磁共振射频匀场系统 |
US10288711B1 (en) | 2015-04-30 | 2019-05-14 | Life Services, LLC | Device and method for simultaneous TX/RX in strongly coupled MRI coil loops |
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CN102985839A (zh) | 2013-03-20 |
WO2012004728A2 (en) | 2012-01-12 |
WO2012004728A3 (en) | 2012-03-29 |
US20130106416A1 (en) | 2013-05-02 |
RU2562978C2 (ru) | 2015-09-10 |
CN102985839B (zh) | 2016-08-10 |
RU2013105320A (ru) | 2014-08-20 |
EP2591376B1 (en) | 2020-12-23 |
JP2013530007A (ja) | 2013-07-25 |
US10254360B2 (en) | 2019-04-09 |
EP2591376A2 (en) | 2013-05-15 |
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