JP2012521843A - 加速b1マッピング - Google Patents
加速b1マッピング Download PDFInfo
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- JP2012521843A JP2012521843A JP2012502841A JP2012502841A JP2012521843A JP 2012521843 A JP2012521843 A JP 2012521843A JP 2012502841 A JP2012502841 A JP 2012502841A JP 2012502841 A JP2012502841 A JP 2012502841A JP 2012521843 A JP2012521843 A JP 2012521843A
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- 238000013507 mapping Methods 0.000 title claims abstract description 87
- 230000035945 sensitivity Effects 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 39
- 230000009466 transformation Effects 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 40
- 239000011159 matrix material Substances 0.000 description 14
- 238000005259 measurement Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000005284 excitation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 238000004804 winding 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
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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
- G01R33/565—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
- G01R33/44—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
- G01R33/24—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
- G01R33/586—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency for optimal flip angle of RF pulses
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- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (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)
Abstract
Description
Claims (15)
- B1磁場マッピングデータセットを収集するために高周波送信コイルのセットを用いてある回数のB1磁場マッピングシーケンスを実行するステップであって、前記回数は前記高周波送信コイルのセットにおける高周波送信コイルの数よりも少ない、ステップと、
前記収集されたB1磁場マッピングデータセットに基づいて前記高周波送信コイルのセットに対するコイル感度を決定するステップとを有する、方法。 - 前記実行されるB1磁場マッピングシーケンスが、(i)直交仮想高周波送信コイルのセットを作るために前記高周波送信コイルのセットに線形変換を実行するステップと、(ii)前記実行されるB1磁場マッピングシーケンスを規定する前記直交仮想高周波送信コイルのセットのサブセットを選択するステップとによって規定される、請求項1に記載の方法。
- 前記線形変換が固有モード変換である、請求項2に記載の方法。
- 前記選択操作(ii)が、
前記直交仮想高周波送信コイルのセットの最低固有モード次数を持つ複数の仮想高周波送信コイルを選択するステップを有する、請求項3に記載の方法。 - 前記実行されるB1磁場マッピングシーケンスがさらに、(iii)前記高周波送信コイルのセットの前記高周波送信コイルに対する対応する振幅及び位相の値を決定するためにエンコード基準として前記高周波送信コイルを用いて前記選択されたサブセットのコイルをエンコードするステップによって規定される、請求項2に記載の方法。
- 前記選択操作(ii)が、主に高い空間周波数成分を持つB1送信磁場を生じる仮想高周波送信コイルを、前記選択されたサブセットから除外するステップを有する、請求項2に記載の方法。
- 前記コイル感度を決定するステップが、前記高周波送信コイルのセットに基づいて収集されたB1磁場マッピングデータセットを生成するために、前記収集されたB1磁場マッピングデータセットに前記線形変換に対応する逆変換を適用するステップを有する、請求項2に記載の方法。
- 前記実行されるB1磁場マッピングシーケンスの回数が、前記高周波送信コイルのセットにおける前記高周波送信コイルの数の半分以下である、請求項1に記載の方法。
- 各B1磁場マッピングシーケンスが、前記高周波送信コイルのセットにおける前記高周波送信コイルの1つを除く全てを用いて実行される、請求項1に記載の方法。
- 実行されるB1磁場マッピングシーケンスの各々が前記高周波送信コイルのセットにおける前記高周波送信コイルの異なる1つを除外する、請求項1に記載の方法。
- 前記収集されたB1磁場マッピングデータセットに基づいて前記高周波送信コイルのセットに対するコイル感度を決定するステップが、
前記収集されたB1磁場マッピングデータセットに基づいて前記高周波送信コイルのセットに対する保存されたコイル感度のセットを調節するステップを有する、請求項1に記載の方法。 - 前記収集されたB1磁場マッピングデータセットに基づいて前記高周波送信コイルのセットに対して決定された前記コイル感度を用いてB1シミングを実行するステップをさらに有する、請求項1に記載の方法。
- 請求項1に記載の方法を実行するためにデジタルプロセッサによって実行可能な命令を保存する記憶媒体。
- 請求項1に記載の方法を実行するデジタルプロセッサ。
- 磁気共鳴システムであって、
磁気共鳴スキャナと、
高周波送信コイルのセットと、
請求項1に記載の方法を実行するデジタルプロセッサとを有し、ある回数のB1磁場マッピングシーケンスを実行するステップは、前記磁気共鳴スキャナに前記高周波送信コイルのセットを用いて前記B1磁場マッピングシーケンスを実行させるステップを有する、磁気共鳴システム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09156820 | 2009-03-31 | ||
EP09156820.4 | 2009-03-31 | ||
PCT/IB2010/051225 WO2010113062A1 (en) | 2009-03-31 | 2010-03-22 | Accelerated b1 mapping |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2012521843A true JP2012521843A (ja) | 2012-09-20 |
JP5525596B2 JP5525596B2 (ja) | 2014-06-18 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012502841A Active JP5525596B2 (ja) | 2009-03-31 | 2010-03-22 | 加速b1マッピング |
Country Status (6)
Country | Link |
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US (1) | US8847593B2 (ja) |
EP (1) | EP2417470A1 (ja) |
JP (1) | JP5525596B2 (ja) |
CN (1) | CN102369451B (ja) |
RU (1) | RU2534724C2 (ja) |
WO (1) | WO2010113062A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014525812A (ja) * | 2011-08-17 | 2014-10-02 | コーニンクレッカ フィリップス エヌ ヴェ | 磁気共鳴撮像中における既定の体積内の無線周波数伝送場の減少 |
JP2015054252A (ja) * | 2013-09-11 | 2015-03-23 | シーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft | B1マップの算出 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103154761B (zh) * | 2010-08-20 | 2015-11-25 | 皇家飞利浦电子股份有限公司 | 在并行发射mri中的虚拟线圈仿真 |
US9157979B2 (en) * | 2011-05-02 | 2015-10-13 | Toshiba Medical Systems Corporation | Efficient multi-station MRI |
JP5677226B2 (ja) * | 2011-07-28 | 2015-02-25 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 磁気共鳴装置およびプログラム |
EP2762070B1 (en) * | 2011-09-29 | 2021-06-09 | Hitachi, Ltd. | Magnetic resonance imaging equipment, high frequency magnetic field irradiation method and program |
US10162027B2 (en) | 2011-11-08 | 2018-12-25 | Hitachi, Ltd. | Magnetic resonance imaging apparatus and irradiation magnetic field distribution measurement method |
US20130289912A1 (en) * | 2012-03-30 | 2013-10-31 | Siemens Aktiengesellschaft | Eigen-vector approach for coil sensitivity maps estimation |
TW201351861A (zh) * | 2012-06-08 | 2013-12-16 | Novatek Microelectronics Corp | 控制電源轉換裝置的方法及其相關電路 |
DE102013205785B4 (de) * | 2013-04-02 | 2014-10-09 | Siemens Aktiengesellschaft | Ermittlung einer Magnetresonanzsystem-Ansteuersequenz auf Basis einer reduzierten Anzahl an Feldverteilungskarten |
WO2016183572A1 (en) | 2015-05-14 | 2016-11-17 | Ohio State Innovation Foundation | Systems and methods for estimating complex b1+ fields of transmit coils of a magnetic resonance imaging (mri) system |
WO2018136705A1 (en) | 2017-01-19 | 2018-07-26 | Ohio State Innovation Foundation | Estimating absolute phase of radio frequency fields of transmit and receive coils in a magnetic resonance |
EP3511727A1 (en) * | 2018-01-11 | 2019-07-17 | Koninklijke Philips N.V. | Active b1+ shimming of transmission coils |
US10527699B1 (en) * | 2018-08-01 | 2020-01-07 | The Board Of Trustees Of The Leland Stanford Junior University | Unsupervised deep learning for multi-channel MRI model estimation |
US11103729B2 (en) * | 2019-08-13 | 2021-08-31 | Elekta ltd | Automatic gating with an MR linac |
Family Cites Families (8)
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JPH0722576B2 (ja) * | 1988-04-11 | 1995-03-15 | 三菱電機株式会社 | 磁気共鳴装置 |
US6294972B1 (en) * | 2000-08-03 | 2001-09-25 | The Mcw Research Foundation, Inc. | Method for shimming a static magnetic field in a local MRI coil |
DE102004045691B4 (de) | 2003-10-27 | 2009-10-01 | Siemens Ag | Verfahren zum Erzeugen eines homogenen hochfrequenten Magnetfelds in einem räumlichen Untersuchungsvolumen einer Magnetresonanzanlage |
DE102004013422B4 (de) * | 2004-03-18 | 2009-02-19 | Siemens Ag | Verfahren zur Homogenisierung eines B1-Felds, Magnetresonanzsystem und Computerprogrammprodukt |
US20070170917A1 (en) * | 2005-01-05 | 2007-07-26 | Koninklijke Philips Electronics N.V. | Magnetic resonance imaging with real-time magnetic filed mapping |
DE102006017439B3 (de) * | 2006-04-13 | 2007-10-11 | Siemens Ag | Verfahren und System zur Steuerung einer Magnetresonanzanlage |
JP5213849B2 (ja) * | 2006-04-21 | 2013-06-19 | 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 | 時間シーケンスのスピン励起による磁気共鳴 |
US20090080750A1 (en) * | 2006-04-21 | 2009-03-26 | Koninklijke Philips Electronics N. V. | Passive mr visualisation of interventional instruments |
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2010
- 2010-03-22 CN CN201080015560.4A patent/CN102369451B/zh active Active
- 2010-03-22 US US13/257,317 patent/US8847593B2/en active Active
- 2010-03-22 RU RU2011143726/28A patent/RU2534724C2/ru not_active IP Right Cessation
- 2010-03-22 EP EP10713371A patent/EP2417470A1/en not_active Ceased
- 2010-03-22 JP JP2012502841A patent/JP5525596B2/ja active Active
- 2010-03-22 WO PCT/IB2010/051225 patent/WO2010113062A1/en active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014525812A (ja) * | 2011-08-17 | 2014-10-02 | コーニンクレッカ フィリップス エヌ ヴェ | 磁気共鳴撮像中における既定の体積内の無線周波数伝送場の減少 |
JP2015054252A (ja) * | 2013-09-11 | 2015-03-23 | シーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft | B1マップの算出 |
Also Published As
Publication number | Publication date |
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US20120007600A1 (en) | 2012-01-12 |
US8847593B2 (en) | 2014-09-30 |
RU2011143726A (ru) | 2013-05-10 |
EP2417470A1 (en) | 2012-02-15 |
CN102369451A (zh) | 2012-03-07 |
JP5525596B2 (ja) | 2014-06-18 |
RU2534724C2 (ru) | 2014-12-10 |
CN102369451B (zh) | 2015-02-25 |
WO2010113062A1 (en) | 2010-10-07 |
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