JP5172658B2 - マルチチャネル送受信アンテナ装置を操作するための方法及び回路装置。 - Google Patents
マルチチャネル送受信アンテナ装置を操作するための方法及び回路装置。 Download PDFInfo
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- JP5172658B2 JP5172658B2 JP2008508378A JP2008508378A JP5172658B2 JP 5172658 B2 JP5172658 B2 JP 5172658B2 JP 2008508378 A JP2008508378 A JP 2008508378A JP 2008508378 A JP2008508378 A JP 2008508378A JP 5172658 B2 JP5172658 B2 JP 5172658B2
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- 238000000034 method Methods 0.000 title claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims 5
- 238000001514 detection method Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 101000610557 Homo sapiens U4/U6 small nuclear ribonucleoprotein Prp31 Proteins 0.000 description 3
- 101001109965 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) 60S ribosomal protein L7-A Proteins 0.000 description 3
- 101001109960 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) 60S ribosomal protein L7-B Proteins 0.000 description 3
- 102100040118 U4/U6 small nuclear ribonucleoprotein Prp31 Human genes 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 101100473185 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) rpn-1 gene Proteins 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101001105683 Homo sapiens Pre-mRNA-processing-splicing factor 8 Proteins 0.000 description 1
- 101000726148 Homo sapiens Protein crumbs homolog 1 Proteins 0.000 description 1
- 102100021231 Pre-mRNA-processing-splicing factor 8 Human genes 0.000 description 1
- 102100027331 Protein crumbs homolog 1 Human genes 0.000 description 1
- 101000825534 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) 40S ribosomal protein S2 Proteins 0.000 description 1
- 101000862778 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) 40S ribosomal protein S3 Proteins 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01R33/3607—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
- G01R33/28—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
- G01R33/54—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
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Amplifiers (AREA)
- Transceivers (AREA)
- Transmitters (AREA)
Description
−耐え得る反射電力のレベルに関係なく、ほとんど全ての単一チャネル又はマルチチャネルRF増幅器(真空管又はソリッドステート)をマルチチャネル送信システムに使用すること、
−そのRFコイル素子を駆動している任意のRF送信チャネルのハードウェア故障が起きた場合、任意のMR系列に対して、特に患者の許容範囲内のSAR制限に接近する系列に対して、SAR安全性制限を満たすことを保証すること、
−強い及び極めて強い磁場のMRIシステムにとって特に重要となることが予想される、マルチチャネルRF送信MRIシステムのための安全性測定をカバーするIEC標準の拡張の基礎を提供すること、
−要求RF送信信号を、ゼロ振幅要求信号(非クリティカル状態)と破断し又は不通となったケーブル(クリティカル状態)との区別を可能にする順方向電力信号に関連させること、
を可能にする。
Claims (10)
- 磁気共鳴撮像システムに用いられるマルチチャネル送受信アンテナ機器又は装置を操作する回路装置であって、前記回路装置が、
アンテナ素子と、RF増幅器の出力及び前記アンテナ素子間のパス内にその第1及び第2端子が接続される少なくとも1つのサーキュレータとに供給される送信信号を増幅する少なくとも1つの前記RF増幅器、
前記サーキュレータの第3端子に接続され、前記サーキュレータの第2端子に反射されるRF電力を放散させるRF負荷、
前記サーキュレータの少なくとも1つの端子に接続された少なくとも1つの方向性カプラ、及び
前記方向性カプラにより順方向電力信号及び反射電力信号を提供され、前記反射及び/又は順方向電力信号のうちの少なくとも1つが規定の最大トリップレベル及び/又は規定の最大合計レベルを上回る場合に、前記RF増幅器のうちの少なくとも1つをオフにする電力モニタユニット、
を有し、前記回路構成は、
(1)前記方向性カプラが前記サーキュレータの第2端子と前記アンテナ素子との間に接続された第2方向性カプラであり、第2方向性カプラが第2順方向電力信号及び第2反射電力信号を前記電力モニタユニットに提供する構成、及び
(2)前記方向性カプラが前記サーキュレータの第3端子と前記RF負荷との間に接続された第3方向性カプラであり、第3方向性カプラが第3順方向電力信号及び第3反射電力信号を前記電力モニタユニットに提供する構成、
の一方を有する回路装置。 - 前記電力モニタユニットが前記回路装置の中央電力モニタユニットである請求項1に記載の回路装置。
- 前記電力モニタユニットが、前記アンテナ素子に供給されるRF電力をモニタし及び/又は評価するために、前記反射及び/又は順方向電力信号のうちの少なくとも1つを処理する請求項1及び2のいずれか一項に記載の回路装置。
- 磁気共鳴撮像システムに用いられ、請求項1から請求項3のいずれか一項に記載の回路装置を備えたマルチチャネル送受信アンテナ機器又は装置を操作する方法であって、前記アンテナ素子に供給されるRF電力をモニタし及び/又は評価するために、前記反射及び/又は順方向電力信号のうちの少なくとも1つが、少なくとも1つの規定の最大トリップレベル及び/又は異なるチャネルからの少なくとも1つの規定の最大合計レベルと比較される方法。
- 前記反射及び/又は順方向電力信号のうちの少なくとも1つが規定の最大トリップレベル及び/又は規定の最大合計レベルを上回る場合に、前記RF増幅器のうちの少なくとも1つが前記電力モニタユニットによってオフにされる請求項4に記載の方法。
- 請求項1及び2のいずれか一項に記載の回路装置を有する、特に磁気共鳴撮像システムに用いられるスペクトロメータ。
- 請求項1から請求項3のいずれか一項に記載の回路装置を有する磁気共鳴撮像システム。
- プログラム可能マイクロプロセッサにおいて実行される際に請求項4又は請求項5に記載の方法を実行する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。
- インターネットに接続されたコンピュータ上で実行される際に、請求項7に記載の磁気共鳴撮像システム又はそのコンポーネントの1つにダウンロードされる請求項8に記載のコンピュータプログラム。
- 請求項8に記載のコンピュータプログラムコード手段を格納するコンピュータ読み取り可能媒体。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP05103584.8 | 2005-04-29 | ||
EP05103584 | 2005-04-29 | ||
PCT/IB2006/051265 WO2006117714A2 (en) | 2005-04-29 | 2006-04-24 | Method and circuit arrangement for operating multi-channel transmit/receive antenna devices |
Publications (2)
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JP2008539637A JP2008539637A (ja) | 2008-11-13 |
JP5172658B2 true JP5172658B2 (ja) | 2013-03-27 |
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JP2008508378A Active JP5172658B2 (ja) | 2005-04-29 | 2006-04-24 | マルチチャネル送受信アンテナ装置を操作するための方法及び回路装置。 |
Country Status (5)
Country | Link |
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US (1) | US7615999B2 (ja) |
EP (1) | EP1877815B1 (ja) |
JP (1) | JP5172658B2 (ja) |
CN (1) | CN101166990B (ja) |
WO (1) | WO2006117714A2 (ja) |
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2006
- 2006-04-24 JP JP2008508378A patent/JP5172658B2/ja active Active
- 2006-04-24 CN CN200680014404XA patent/CN101166990B/zh active Active
- 2006-04-24 EP EP06728022A patent/EP1877815B1/en active Active
- 2006-04-24 WO PCT/IB2006/051265 patent/WO2006117714A2/en not_active Application Discontinuation
- 2006-04-24 US US11/912,685 patent/US7615999B2/en active Active
Also Published As
Publication number | Publication date |
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US7615999B2 (en) | 2009-11-10 |
CN101166990A (zh) | 2008-04-23 |
JP2008539637A (ja) | 2008-11-13 |
WO2006117714A2 (en) | 2006-11-09 |
EP1877815B1 (en) | 2012-11-28 |
US20090128153A1 (en) | 2009-05-21 |
EP1877815A2 (en) | 2008-01-16 |
CN101166990B (zh) | 2012-10-10 |
WO2006117714A3 (en) | 2007-06-21 |
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