JP2001507265A - Nmr用の直角位相だ円形バード・ケージ・コイル - Google Patents
Nmr用の直角位相だ円形バード・ケージ・コイルInfo
- Publication number
- JP2001507265A JP2001507265A JP54580698A JP54580698A JP2001507265A JP 2001507265 A JP2001507265 A JP 2001507265A JP 54580698 A JP54580698 A JP 54580698A JP 54580698 A JP54580698 A JP 54580698A JP 2001507265 A JP2001507265 A JP 2001507265A
- Authority
- JP
- Japan
- Prior art keywords
- elliptical
- resonator
- legs
- bird cage
- coil
- 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
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
- G01R33/28—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
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Catching Or Destruction (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1. だ円状の直角駆動バード・ケージ共鳴体であって, (a)共通の軸線に平行に配置され,前記軸線を取り囲むだ円状の境界の周辺に 分布するN個の脚部材と(Nは四の倍数で,だ円状の境界は軌道長軸mと軌道短 軸nをもち,前記脚部材が,p番目の脚部材に対し θp=tan-1(n/m tanφp)の角度で配置され, ここで,φp=2πp/N+φ0,φ0=0またはπ/Nで,これにより隣接した脚の間の 電気的位相各は一定値の,2π/Nとなる。) (b)隣接した前記脚を結合するリアクタンス要素であっれ,前記脚部材および リアクタンス要素が,前記境界により定義される,前記軸線に対して横向きの面 に配置される伝送線を形成するところのリアクタンス要素と(当該リアクタンス 要素が, Ip=2Cejωt(m+n)sinπ/N(-j sinφp+cosφp)(ここでCは定数)のように対応 する振幅において,前記各脚部材により支持されるように前記脚部材の各々の間 で電流を分配する電流ディバイダーを含む), を含み, (c)二つの前記脚部材が,それぞれのRF電源と通信する,間の位相角の差が90 °をもち,前記電源が等しいピーク値をもち,直角関係にある,だ円状の直角駆 動バード・ ケージ・共鳴体。 2. 前記二つの脚部材が長および短だ円軸線のそれぞれと実質的に整合する,と ころの請求項1に記載の,だ円状の直角駆動バード・ケージ・共鳴体。 3. 前記二つの脚部材が,45°の電気的位相角で,それぞれの長および短だ円軸 線と実質的に整合する,ところの請求項1に記載のだ円状の直角駆動バード・ケ ージ・共鳴体。 4. 前記二つの脚部材が,前記電源への誘導性結合を通して,前記RF電源と通信 する,請求項1に記載の,だ円状の直角駆動バード・ケージ・共鳴体。 5. 前記二つの脚部材が,前記電源への非誘導性結合を通して,前記RF電源と通 信する,請求項1に記載の,だ円状の直角駆動バード・ケージ・共鳴体。 6. 前記二つのリアクタンス要素が,前記電源への誘導性結合を通して,前記RF 電源と通信する,請求項1に記載の,だ円状の直角駆動バード・ケージ・共鳴体 。 7. 前記二つのリアクタンス要素が,前記電源への非誘導性結合を通して,前記 RF電源と通信する,請求項1に記載の,だ円状の直角駆動バード・ケージ・共鳴 体。 8. だ円状のバード・ケージ共鳴体であって, (a)共通軸線に平行で,該軸線を取り囲み,アスペクト比m/nを有するだ円状境 界の周辺にそって分布する複数の脚部材と, (b)隣接する該脚部材を結合するリアクタンス要素と, を含み, 前記脚部材およびリアクタンス要素が,前記境界により定義される前記軸線に 対して横の面に配置される伝送線を形成し,rf電流を支持できる各前記脚がそれ ぞれrf位相を有し,前記脚が前記rf電流の位相各における一定の角度増加に対応 する角度間隔をあけて配置される,ところのだ円バード・ケージ共鳴体。 9. 前記リアクタンス要素が,隣接する脚の間で実質的に等しい位相角度とする ため,選択された値のトリムコンデンサを含む。請求項8に記載のだ円バード・ ケージ共鳴体。 10.前記脚部材が,隣接する脚の間で実質的に等しい位相角度とするため,選択 された値のトリムコンデンサを含む,請求項8に記載のだ円バード・ケージ共鳴 体。 11.さらに,当該共鳴体を横向きに取り囲み,そこから間隔があけられた伝導性 シールドを含む,請求項8に記載のだ円バード・ケージ共鳴体。 12.前記誘導性シールドが前記だ円状の境界と共焦となる,ところの請求項8に 記載のだ円バード・ケージ共鳴体
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/823,295 | 1997-03-21 | ||
US08/823,295 US5986454A (en) | 1997-03-21 | 1997-03-21 | Quadrature elliptical birdcage coil for NMR |
PCT/US1998/005418 WO1998043102A1 (en) | 1997-03-21 | 1998-03-17 | Quadrature elliptical birdcage coil for nmr |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001507265A true JP2001507265A (ja) | 2001-06-05 |
JP3957327B2 JP3957327B2 (ja) | 2007-08-15 |
Family
ID=25238344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54580698A Expired - Fee Related JP3957327B2 (ja) | 1997-03-21 | 1998-03-17 | Nmr用の直角位相だ円形バード・ケージ・コイル |
Country Status (6)
Country | Link |
---|---|
US (1) | US5986454A (ja) |
EP (1) | EP0906580B1 (ja) |
JP (1) | JP3957327B2 (ja) |
CA (1) | CA2255825C (ja) |
DE (1) | DE69832021T2 (ja) |
WO (1) | WO1998043102A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012239737A (ja) * | 2011-05-23 | 2012-12-10 | Toshiba Corp | 磁気共鳴イメージング装置 |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9511101D0 (en) * | 1995-06-01 | 1995-07-26 | British Tech Group | Magnetic coil |
US6560475B1 (en) * | 1997-08-22 | 2003-05-06 | Image-Guided Drug Delivery Systems, Inc. | Microcoil device for local wide field-of-view and large gain magnetic resonance imaging |
US6452393B1 (en) * | 1999-04-16 | 2002-09-17 | University Of Alberta | Nuclear magnetic resonance birdcage coil with Cassinian oval former |
US6285189B1 (en) * | 1999-09-04 | 2001-09-04 | Varian, Inc. | Millipede coils |
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 |
US6788058B1 (en) | 2001-03-08 | 2004-09-07 | General Electric Company | Asymmetric ring dome radio frequency coil |
US6650926B1 (en) | 2001-03-30 | 2003-11-18 | Usa Instruments, Inc. | Flexible multi-section MRI radio frequency array coil |
US6552538B2 (en) * | 2001-04-11 | 2003-04-22 | Koninklijke Philips Electronics, N.V. | RF transmit calibration for open MRI systems |
US6487436B1 (en) | 2001-04-17 | 2002-11-26 | Ge Medical Systems Global Technology Company, Llc | Switchable field of view apparatus and method for magnetic resonance imaging |
US6630829B1 (en) | 2002-04-22 | 2003-10-07 | Ge Medical Systems Global Technology Co., Llc | Gradient coil set capable of producing a variable field of view |
DE10334170B3 (de) * | 2003-07-26 | 2005-06-02 | Physikalisch-Technische Bundesanstalt Braunschweig Und Berlin | Anordnung zum Erzeugen von Hochfrequenz-B1-Feldern in der NMR mit Flächenstromantennen |
CA2587467A1 (en) * | 2004-11-16 | 2006-06-29 | Tbs Technologies, Llc | Apparatus for the generation of chlorine dioxide |
DE102008005994B4 (de) * | 2008-01-24 | 2012-03-29 | Siemens Aktiengesellschaft | Anordnung zur Ansteuerung einer Antennenanordnung |
US8760164B2 (en) * | 2010-01-29 | 2014-06-24 | General Electric Company | Magnetic resonant imaging gradient driver architecture |
JP5685476B2 (ja) | 2011-04-11 | 2015-03-18 | 株式会社日立製作所 | 磁気共鳴イメージング装置 |
JP5968318B2 (ja) * | 2011-07-30 | 2016-08-10 | 株式会社日立製作所 | バードケージ型高周波コイル及び磁気共鳴イメージング装置 |
US10174569B2 (en) | 2013-06-20 | 2019-01-08 | Aspect International (2015) Private Limited | NMR/MRI-based integrated system for analyzing and treating of a drilling mud for drilling mud recycling process and methods thereof |
US9494503B2 (en) | 2013-11-06 | 2016-11-15 | Aspect Imaging Ltd. | Inline rheology/viscosity, density, and flow rate measurement |
WO2016116926A1 (en) | 2015-01-19 | 2016-07-28 | Aspect International (2015) Private Limited | Nmr-based systems for crude oil enhancement and methods thereof |
DE102015203457A1 (de) * | 2015-02-26 | 2016-09-01 | Siemens Aktiengesellschaft | Sendevorrichtung für einen Magnetresonanztomographen |
CN106053299B (zh) * | 2015-04-12 | 2020-10-30 | 艾斯拜克特Ai有限公司 | 非圆形横截面管道中的流体的nmr成像 |
CN106324010A (zh) | 2015-07-02 | 2017-01-11 | 艾斯拜克特Ai有限公司 | 使用mr设备对在管道中流动的流体的分析 |
US10655996B2 (en) | 2016-04-12 | 2020-05-19 | Aspect Imaging Ltd. | System and method for measuring velocity profiles |
JP7073367B2 (ja) * | 2016-11-23 | 2022-05-23 | ゼネラル・エレクトリック・カンパニイ | 磁気共鳴撮像(mri)システム用の前部無線周波数(rf)コイルアレイ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751464A (en) * | 1987-05-04 | 1988-06-14 | Advanced Nmr Systems, Inc. | Cavity resonator with improved magnetic field uniformity for high frequency operation and reduced dielectric heating in NMR imaging devices |
EP0486590B1 (en) * | 1989-08-11 | 1996-11-27 | British Technology Group Ltd | Resonant cavities for nmr |
US5372137A (en) * | 1993-01-19 | 1994-12-13 | The Mcw Research Foundation, Inc. | NMR local coil for brain imaging |
US5543711A (en) * | 1994-11-22 | 1996-08-06 | Picker International, Inc. | Multiple quadrature volume coils for magnetic resonance imaging |
-
1997
- 1997-03-21 US US08/823,295 patent/US5986454A/en not_active Expired - Lifetime
-
1998
- 1998-03-17 WO PCT/US1998/005418 patent/WO1998043102A1/en active IP Right Grant
- 1998-03-17 DE DE69832021T patent/DE69832021T2/de not_active Expired - Lifetime
- 1998-03-17 EP EP98914262A patent/EP0906580B1/en not_active Expired - Lifetime
- 1998-03-17 JP JP54580698A patent/JP3957327B2/ja not_active Expired - Fee Related
- 1998-03-17 CA CA002255825A patent/CA2255825C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012239737A (ja) * | 2011-05-23 | 2012-12-10 | Toshiba Corp | 磁気共鳴イメージング装置 |
Also Published As
Publication number | Publication date |
---|---|
CA2255825A1 (en) | 1998-10-01 |
CA2255825C (en) | 2002-05-28 |
EP0906580B1 (en) | 2005-10-26 |
US5986454A (en) | 1999-11-16 |
DE69832021T2 (de) | 2006-07-27 |
DE69832021D1 (de) | 2005-12-01 |
WO1998043102A1 (en) | 1998-10-01 |
EP0906580A1 (en) | 1999-04-07 |
JP3957327B2 (ja) | 2007-08-15 |
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