JP2008514259A - 磁気共鳴デバイス及び方法 - Google Patents
磁気共鳴デバイス及び方法 Download PDFInfo
- Publication number
- JP2008514259A JP2008514259A JP2007533013A JP2007533013A JP2008514259A JP 2008514259 A JP2008514259 A JP 2008514259A JP 2007533013 A JP2007533013 A JP 2007533013A JP 2007533013 A JP2007533013 A JP 2007533013A JP 2008514259 A JP2008514259 A JP 2008514259A
- Authority
- JP
- Japan
- Prior art keywords
- aspect ratio
- amplitude
- phase
- size
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G01R33/543—Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription
-
- 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
- G01R33/28—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
-
- 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
Abstract
Description
体の大きさ及び/又はアスペクト比を決定するステップと、
RFパルスを有する画像化シーケンスを用いて、体のMR画像を取得するステップとを有し、RFパルスの生成の間に励起されるRF送信アンテナの異なる共鳴モードの位相及び振幅が、体の大きさ及び/又はアスペクト比に基づき、独立して制御される。
Claims (11)
- 定常で実質的に一様な主磁場に置かれる体に向かってRFパルスを照射するRF送信アンテナを備える前記体をMR画像化するデバイスであって、前記RF送信アンテナが異なる共鳴モードを持っており、前記デバイスは、
前記体の大きさ及び/又はアスペクト比を決定し、かつ
RFパルスを有する画像化シーケンスを用いて前記体のMR画像を取得するよう構成されており、前記RFパルスの照射の間励起される前記RF送信アンテナの前記異なる共鳴モードの位相及び振幅が、前記体の大きさ及び/又はアスペクト比に基づき制御される、デバイス。 - 前記デバイスが、更に、較正手順を用いて前記体の大きさ及び/又はアスペクト比を決定するよう構成され、前記較正手順は、前記体の低解像度のMR画像又は少なくとも2つの投影MR画像のいずれかの取得を含む、請求項1に記載のデバイス。
- 前記アスペクト比が、前記較正手順の間取得される前記MR画像から、2つの直交空間方向における前記体の異なる寸法の比として計算される、請求項2に記載のデバイス。
- 2つ又はそれ以上の個別の送信チャネルに接続される送信ユニットを有し、各送信チャネルが、前記RF送信アンテナの前記共鳴モードのいずれかに関連付けられており、前記個別の送信チャネルに供給される前記RF信号の前記位相及び前記振幅は、前記送信ユニットを用いて個別に制御可能である、請求項1乃至3のいずれか一項に記載のデバイス。
- 2つ又はそれ以上の個別の受信チャネルに接続される受信ユニットを有し、各受信チャネルが、前記RF送信アンテナの前記共鳴モードのいずれかに関連付けられる、請求項1乃至4のいずれか一項に記載のデバイス。
- プログラム制御を備えるコンピュータ手段を更に有し、前記プログラム制御が、前記体の前記大きさ及び/又は前記アスペクト比を対応する位相及び振幅値に関連付けるルックアップテーブル又は関数的な関係に基づき、前記異なる共鳴モードの前記位相及び前記振幅を選択するよう構成される、請求項1乃至5のいずれか一項に記載のデバイス。
- 定常で実質的に一様な主磁場に置かれる体の少なくとも部分をMR画像化する方法において、
前記体の大きさ及び/又はアスペクト比を決定するステップと、
RFパルスを有する画像化シーケンスを用いて前記体のMR画像を取得するステップとを有し、前記RFパルスの生成の間励起されるRF送信アンテナの異なる共鳴モードの前記位相及び振幅が、前記体の大きさ及び/又は前記アスペクト比に基づき独立に制御される、方法。 - 前記体の大きさ及び/又はアスペクト比が、前記体の低解像度MR画像又は少なくとも2つの投影MR画像のいずれかの取得を含む較正手順を用いて決定される、請求項7に記載の方法。
- 前記異なる共鳴モードの前記位相及び振幅が、前記体の大きさ及び/又はアスペクト比を対応する位相及び振幅値に関連付けるルックアップテーブル又は関数的な関係に基づき選択される、請求項7又は8に記載の方法。
- MR画像化デバイスのためのコンピュータプログラムであって、
前記MR画像化デバイスの定常で実質的に一様な主磁場に置かれる体の大きさ及び/又はアスペクト比を決定する命令と、
RFパルスを有する画像化シーケンスを用いて前記体のMR画像データの取得を制御する命令と、
前記体の前記大きさ及び/又はアスペクト比に基づき、前記RFパルスの生成の間励起されるRF送信アンテナの異なる共鳴モードの位相及び振幅を選択する命令とを備える、コンピュータプログラム。 - 前記体の大きさ及び/又はアスペクト比を対応する位相及び振幅値に関連付けるルックアップテーブル又は関数的な関係に基づき、前記異なる共鳴モードの前記位相及び振幅を選択する命令を更に有する、請求項10に記載のコンピュータプログラム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04104666.5 | 2004-09-24 | ||
EP04104666 | 2004-09-24 | ||
PCT/IB2005/053002 WO2006033047A2 (en) | 2004-09-24 | 2005-09-13 | Adjustment of rf-field homogeneity in high-field mr imaging |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008514259A true JP2008514259A (ja) | 2008-05-08 |
JP5085327B2 JP5085327B2 (ja) | 2012-11-28 |
Family
ID=35607868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007533013A Expired - Fee Related JP5085327B2 (ja) | 2004-09-24 | 2005-09-13 | 磁気共鳴デバイス及び方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7769425B2 (ja) |
EP (1) | EP1794608B1 (ja) |
JP (1) | JP5085327B2 (ja) |
CN (1) | CN101027569B (ja) |
WO (1) | WO2006033047A2 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010029640A (ja) * | 2008-06-26 | 2010-02-12 | Toshiba Corp | 磁気共鳴イメージング装置 |
JP2011131045A (ja) * | 2009-11-26 | 2011-07-07 | Toshiba Corp | 磁気共鳴イメージング装置 |
US10677861B2 (en) | 2016-10-21 | 2020-06-09 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7852084B2 (en) | 2006-04-21 | 2010-12-14 | Koninklijke Philips Electronics N.V. | Magnetic resonance with time sequential spin excitation |
CN101427149B (zh) | 2006-04-21 | 2013-09-18 | 皇家飞利浦电子股份有限公司 | 包含在线性ⅰ通道、线性q通道、正交及反正交模式之间的高速线圈模式切换的mr |
US7525313B2 (en) * | 2007-05-04 | 2009-04-28 | General Electric Company | System and method for multi-channel MR transmission |
US7508214B2 (en) | 2007-05-21 | 2009-03-24 | Medrad, Inc. | Transmit-mode phased array coils for reduced SAR and artifact issues |
EP2425268B1 (en) | 2009-04-30 | 2017-08-02 | Koninklijke Philips N.V. | Arrangement and method for influencing and/or detecting magnetic particles and for magnetic resonance imaging |
CN102498411A (zh) * | 2009-09-17 | 2012-06-13 | 皇家飞利浦电子股份有限公司 | Mri中rf功率和rf场均匀性的同时优化 |
JP5868028B2 (ja) | 2010-05-27 | 2016-02-24 | 株式会社東芝 | 磁気共鳴イメージング装置 |
WO2012085796A1 (en) * | 2010-12-22 | 2012-06-28 | Koninklijke Philips Electronics N.V. | Parallel mri method using calibration scan, coil sensitivity maps and navigators for rigid motion compensation |
US9535142B2 (en) | 2011-04-21 | 2017-01-03 | Koninklijke Philips Electronics N.V. | Multichannel RF volume resonator for MRI |
CN104023627A (zh) * | 2012-08-29 | 2014-09-03 | 株式会社东芝 | 磁共振成像装置及其比吸收率的运算方法 |
CN113219389B (zh) * | 2021-05-07 | 2023-04-14 | 上海联影医疗科技股份有限公司 | 磁共振射频模式确定方法、设备及可读存储介质 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04322640A (ja) * | 1991-04-23 | 1992-11-12 | Hitachi Ltd | 計測機能付きmrイメージング装置 |
JP2001178701A (ja) * | 1999-12-24 | 2001-07-03 | Toshiba Medical System Co Ltd | Mri装置及びmrイメージング方法 |
US6501274B1 (en) * | 1999-10-15 | 2002-12-31 | Nova Medical, Inc. | Magnetic resonance imaging system using coils having paraxially distributed transmission line elements with outer and inner conductors |
US20030020475A1 (en) * | 2001-07-13 | 2003-01-30 | Leussler Christoph Guenther | RF coil system for an MR apparatus |
JP2003180659A (ja) * | 2001-11-21 | 2003-07-02 | Koninkl Philips Electronics Nv | 磁気共鳴撮像装置用のrfコイル系 |
WO2004053514A1 (en) * | 2002-12-06 | 2004-06-24 | Koninklijke Philips Electronics N.V. | Magnetic resonance imaging system with a plurality of transmit coils |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100449327C (zh) * | 1996-06-27 | 2009-01-07 | 皇家菲利浦电子有限公司 | 用于磁共振成像装置的射频线圈系统 |
US7598739B2 (en) * | 1999-05-21 | 2009-10-06 | Regents Of The University Of Minnesota | Radio frequency gradient, shim and parallel imaging coil |
GB2355075A (en) * | 1999-10-09 | 2001-04-11 | Marconi Electronic Syst Ltd | MRI apparatus with additional data correction coil |
DE10138705C1 (de) * | 2001-08-07 | 2003-03-27 | Siemens Ag | Verfahren zur Homogenisierung der Bildaufnahme einer Magnet-resonanzmessung |
CN1735814B (zh) | 2003-01-07 | 2010-06-16 | 皇家飞利浦电子股份有限公司 | 用于具有多个发送通道的mr设备的高频系统及其中的mr设备 |
DE102004053777B4 (de) * | 2003-11-19 | 2010-09-02 | Siemens Ag | Verfahren zum Bestimmen eines Einstellparameters einer Hochfrequenzsendeanordnung für eine Magnetresonanzanlage |
-
2005
- 2005-09-13 US US11/575,527 patent/US7769425B2/en not_active Expired - Fee Related
- 2005-09-13 JP JP2007533013A patent/JP5085327B2/ja not_active Expired - Fee Related
- 2005-09-13 WO PCT/IB2005/053002 patent/WO2006033047A2/en active Application Filing
- 2005-09-13 CN CN2005800322502A patent/CN101027569B/zh not_active Expired - Fee Related
- 2005-09-13 EP EP05786836.6A patent/EP1794608B1/en not_active Not-in-force
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04322640A (ja) * | 1991-04-23 | 1992-11-12 | Hitachi Ltd | 計測機能付きmrイメージング装置 |
US6501274B1 (en) * | 1999-10-15 | 2002-12-31 | Nova Medical, Inc. | Magnetic resonance imaging system using coils having paraxially distributed transmission line elements with outer and inner conductors |
JP2001178701A (ja) * | 1999-12-24 | 2001-07-03 | Toshiba Medical System Co Ltd | Mri装置及びmrイメージング方法 |
US20030020475A1 (en) * | 2001-07-13 | 2003-01-30 | Leussler Christoph Guenther | RF coil system for an MR apparatus |
JP2003180659A (ja) * | 2001-11-21 | 2003-07-02 | Koninkl Philips Electronics Nv | 磁気共鳴撮像装置用のrfコイル系 |
WO2004053514A1 (en) * | 2002-12-06 | 2004-06-24 | Koninklijke Philips Electronics N.V. | Magnetic resonance imaging system with a plurality of transmit coils |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010029640A (ja) * | 2008-06-26 | 2010-02-12 | Toshiba Corp | 磁気共鳴イメージング装置 |
US8816688B2 (en) | 2008-06-26 | 2014-08-26 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
JP2011131045A (ja) * | 2009-11-26 | 2011-07-07 | Toshiba Corp | 磁気共鳴イメージング装置 |
US9746532B2 (en) | 2009-11-26 | 2017-08-29 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus |
US9835700B2 (en) | 2009-11-26 | 2017-12-05 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus |
US10677861B2 (en) | 2016-10-21 | 2020-06-09 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus |
Also Published As
Publication number | Publication date |
---|---|
WO2006033047A2 (en) | 2006-03-30 |
US7769425B2 (en) | 2010-08-03 |
CN101027569B (zh) | 2011-03-16 |
JP5085327B2 (ja) | 2012-11-28 |
WO2006033047A3 (en) | 2006-05-11 |
US20090137896A1 (en) | 2009-05-28 |
EP1794608A2 (en) | 2007-06-13 |
EP1794608B1 (en) | 2013-05-01 |
CN101027569A (zh) | 2007-08-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5085327B2 (ja) | 磁気共鳴デバイス及び方法 | |
EP2013637B1 (en) | Mr involving high speed coil mode switching between i-channel linear, q-channel linear, quadrature and anti-quadrature modes | |
CN106918794B (zh) | 磁共振系统及成像的方法 | |
US9599691B2 (en) | Magnetic resonance apparatus and method for RF excitation with two resonance frequencies to detect the CEST effect | |
EP2013636A1 (en) | Magnetic resonance with time sequential spin excitation | |
US10031202B2 (en) | Method and magnetic resonance apparatus for the acquisition of MR data of a slice within a subject | |
RU2686879C2 (ru) | Мр томография с нулевой эхо-задержкой | |
US10156624B2 (en) | Method and magnetic resonance apparatus for reconstructing an MR image dependent on the chemical shift | |
JP5305673B2 (ja) | 磁気共鳴断層撮影による画像化方法、スピン断層撮影装置およびコンピュータプログラムを記録したコンピュータ読み取り可能な記録媒体 | |
US7253621B2 (en) | Method and system to dynamically configure transmit receive coils to calibrate a magnetic resonance imaging system | |
JP2007503239A (ja) | 磁気共鳴撮像におけるrfコイルの空間感度特性の決定 | |
JP2004527308A (ja) | オープンmriシステムのためのrf送信較正 | |
US10185007B2 (en) | Noise reduction during selective MR excitation | |
JP2006527621A (ja) | 磁気共鳴において主磁場をシミングするための方法 | |
US11698427B2 (en) | Methods and systems for estimating transmit attenuation for a magnetic resonance imaging scan | |
CN110811619B (zh) | 用于估计磁共振成像扫描的发射衰减的方法和系统 | |
US20090099443A1 (en) | Magnetic resonance device and method | |
JP2005021371A (ja) | ゲイン調節方法および磁気共鳴撮影装置 | |
US11698432B2 (en) | Magnetic resonance imaging system, and main magnetic field correction method therefor and storage medium | |
JP2018114163A (ja) | 磁気共鳴イメージング装置 | |
CN115963439A (zh) | 用于估计磁共振成像扫描的发射衰减的方法和系统 | |
JP2023095150A (ja) | Rfアンプ及びmri装置 | |
JPH0549617A (ja) | Mri装置の受信回路 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20080912 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20110512 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20110628 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20111222 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20120117 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20120807 |
|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20120905 |
|
R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150914 Year of fee payment: 3 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |