JP5213698B2 - マルチチャネル送信/受信アンテナ装置を動作させる方法及び回路構成 - Google Patents
マルチチャネル送信/受信アンテナ装置を動作させる方法及び回路構成 Download PDFInfo
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- JP5213698B2 JP5213698B2 JP2008508373A JP2008508373A JP5213698B2 JP 5213698 B2 JP5213698 B2 JP 5213698B2 JP 2008508373 A JP2008508373 A JP 2008508373A JP 2008508373 A JP2008508373 A JP 2008508373A JP 5213698 B2 JP5213698 B2 JP 5213698B2
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- 238000000034 method Methods 0.000 title claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 38
- 238000012545 processing Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 7
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims 4
- 238000005259 measurement Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 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
- G01R33/44—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
- G01R33/34—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
- G01R33/58—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
-
- 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
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/246—Spatial mapping of the RF magnetic field B1
-
- 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
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
Claims (11)
- 複数のRFアンテナ要素を有するマルチチャネル送信/受信アンテナ装置を動作させる方法であって、
‐1若しくはそれより多くの前記RFアンテナ要素のどれが、RF信号を送信するか、及び/又は、1若しくはそれより多くの前記RFアンテナ要素のどれが、RF信号を受信するかを選択するステップ、並びに/又は
‐前記少なくとも1つの送信RFアンテナ要素により送信される前記RF信号の振幅及び/又は位相を、各々の前記送信RFアンテナ要素に対して、個々に且つ独立に制御するステップが、
前記RFアンテナ要素の1つに各々割り当てられる、複数の送信チャネル及び/又は受信チャネルを制御することによってなされ、
前記RFアンテナ要素を選択するステップ及び/又は制御するステップが、前記アンテナ装置により生成されるRF場内に位置される少なくとも1つの受信RFアンテナ要素により受信される受信RF信号の少なくとも1つのレベルに依存してなされ、
前記RFアンテナ要素を選択するステップ及び/又は制御するステップは、前記少なくとも1つの受信RFアンテナ要素により受信された受信RF信号をDC信号に変換し、前記DC信号の電圧レベルを当該受信RFアンテナ要素についてプリセットされたトリップレベルと比較し、いずれかの受信RFアンテナ要素について前記DC信号の電圧レベルが前記プリセットされたトリップレベルを上回る場合、前記送信チャネルの出力に接続されたRF増幅器を無効化して、前記送信RFアンテナ要素からの送信RF信号の送信を抑制することを含み、前記トリップレベルは各受信RFアンテナ要素について個別にプリセットされる、方法。 - 前記少なくとも1つの受信RFアンテナ要素が、前記アンテナ装置により生成される前記RF場内に位置されるピックアップ/チューンコイルである、請求項1に記載の方法。
- マルチチャネル送信/受信アンテナ装置を動作させる請求項1又は2に記載の方法を行うための回路構成であって、複数の前記RFアンテナ要素と、制御ユニットと、前記アンテナ要素の1つに各々割り当てられる複数の前記送信チャネル及び複数の前記受信チャネルとを有し、前記制御ユニットは、RF信号を送信する前記アンテナ要素を選択するため、及びRF信号を受信する前記RFアンテナ要素を選択するため、並びに/又は、前記送信されたRF信号の振幅及び/又は位相を個々に調整するために前記送信チャネルを制御するために設けられる回路構成。
- 前記制御ユニットは、前記アンテナ装置により生成される前記RF場内に位置される、少なくとも1つのピックアップ/チューンコイルにより受信される受信RF信号の少なくとも1つのレベルに依存して、前記送信チャネルを制御するステップ、及び/又は、前記アンテナ要素を選択するステップのために設けられる、請求項3に記載の回路構成。
- 前記受信されたRF信号を処理すると共に、前記受信RF信号から変換されたDC信号の電圧レベルがトリップレベルを上回る場合に送信RF信号の送信を抑制するために、該DC信号の電圧レベルをトリップレベルと比較するピックアップコイル検出ユニットを有する、請求項4に記載の回路構成。
- 各々の前記送信チャネルにおいて、個々に独立して前記送信RF信号を増幅するために、前記制御ユニットにより制御される複数の1チャネルRF増幅器、又は1つのマルチチャネルRF増幅器を有する、請求項3に記載の回路構成。
- 請求項3乃至5の何れか一項に記載の回路構成を有する、磁気共鳴画像化システムの使用のためのマルチチャネル増幅器。
- 請求項3乃至5の何れか一項に記載の回路構成を有する、磁気共鳴画像化システムの使用のためのスペクトロメータ。
- 請求項3乃至6の何れか一項に記載の回路構成を有する、磁気共鳴画像化システム。
- 請求項1又は2に記載の方法をコンピュータに実施させるためのコンピュータプログラムコード手段を有するコンピュータプログラム。
- 請求項10に記載のコンピュータプログラムコード手段を有し、コンピュータ読み出し可能な媒体に記憶される、コンピュータプログラム。
Applications Claiming Priority (3)
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EP05103520.2 | 2005-04-28 | ||
EP05103520 | 2005-04-28 | ||
PCT/IB2006/051251 WO2006114749A1 (en) | 2005-04-28 | 2006-04-21 | Method and circuit arrangement for operating multi-channel transmit/receive antenna devices |
Publications (3)
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JP2008538968A JP2008538968A (ja) | 2008-11-13 |
JP2008538968A5 JP2008538968A5 (ja) | 2012-09-20 |
JP5213698B2 true JP5213698B2 (ja) | 2013-06-19 |
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JP2008508373A Active JP5213698B2 (ja) | 2005-04-28 | 2006-04-21 | マルチチャネル送信/受信アンテナ装置を動作させる方法及び回路構成 |
Country Status (5)
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US (1) | US7701213B2 (ja) |
EP (1) | EP1877814A1 (ja) |
JP (1) | JP5213698B2 (ja) |
CN (1) | CN101166989B (ja) |
WO (1) | WO2006114749A1 (ja) |
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2006
- 2006-04-21 US US11/912,683 patent/US7701213B2/en active Active
- 2006-04-21 EP EP06728010A patent/EP1877814A1/en not_active Ceased
- 2006-04-21 CN CN2006800143579A patent/CN101166989B/zh active Active
- 2006-04-21 WO PCT/IB2006/051251 patent/WO2006114749A1/en not_active Application Discontinuation
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EP1877814A1 (en) | 2008-01-16 |
CN101166989A (zh) | 2008-04-23 |
JP2008538968A (ja) | 2008-11-13 |
US7701213B2 (en) | 2010-04-20 |
WO2006114749A1 (en) | 2006-11-02 |
CN101166989B (zh) | 2012-08-08 |
US20080211501A1 (en) | 2008-09-04 |
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