JP6224304B2 - 磁気共鳴撮像(mri)システムの受信セクション - Google Patents
磁気共鳴撮像(mri)システムの受信セクション Download PDFInfo
- Publication number
- JP6224304B2 JP6224304B2 JP2012132485A JP2012132485A JP6224304B2 JP 6224304 B2 JP6224304 B2 JP 6224304B2 JP 2012132485 A JP2012132485 A JP 2012132485A JP 2012132485 A JP2012132485 A JP 2012132485A JP 6224304 B2 JP6224304 B2 JP 6224304B2
- Authority
- JP
- Japan
- Prior art keywords
- impedance
- coil
- fet
- preamplifier
- approximately
- 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.)
- Active
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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/365—Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array
-
- 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
- G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
82 前置増幅器
84 システムインタフェース
86 受信チャンネル
88 バイアス制御ライン
90 RF IN制御ライン
100 コイルアレイ
102 RF受信器コイル
122 抵抗器
124 インダクタ
126 コンデンサ
128 インピーダンス変成器
130 インダクタ
132 インダクタ
134 コンデンサ
136 コンデンサ
138 出力
140 インダクタ
142 増幅器
144 入力回路
146 インピーダンス変成器
148 コンデンサ
150 FET
152 雑音円
154 中心
156 中心
158 円周
160 方法
200 MRIシステム
232 撮像部分
236 処理部分
240 ガントリ
242 ボア
256 制御器
262 超伝導マグネット
264 容器
266 断熱体
268 磁場傾斜コイル
270 RF送信コイル
276 制御器
278 磁場制御
282 傾斜磁場制御
284 メモリ
286 表示デバイス
288 T−Rスイッチ
290 RF送信器
292 受信器
Claims (8)
- 無線周波数(RF)受信器コイル(102)と、前置増幅器と、前記RF受信器コイルと前記前置増幅器との間に配され、リアクタンスを有する第1のインピーダンス変成器とを有する、磁気共鳴撮像(MRI)システムの受信セクションであって、
前記第1のインピーダンス変成器は、
前記RF受信器コイルのコイルインピーダンスを、少なくとも概ね100オームの前記前置増幅器のソースインピーダンスに変換し、
前記前置増幅器は、
増幅器(142)と、
前記第1のインピーダンス変成器と前記増幅器との間に設けられた入力回路であって、該入力回路は第2のインピーダンス変成器(146)と電界効果トランジスタ(FET)(150)とを備えており、該FETは該第2のインピーダンス変成器と増幅器の間に電気的に接続されており、該FETはFETインピーダンスを有しており、該第2のインピーダンス変成器は前記少なくとも概ね100オームの前記ソースインピーダンスを変換するように構成されており、該第2のインピーダンス変成器はさらにFETインピーダンスを概ね5オーム未満の前置増幅器入力インピーダンスに変換するように構成されている、入力回路(144)と、
を備える受信セクション。 - 前記第2のインピーダンス変成器(146)は、前記ソースインピーダンスを前記FET(150)の雑音円(152)の範囲内のインピーダンスに変換するように構成されている、請求項1に記載の受信セクション。
- 前記第2のインピーダンス変成器(146)は、少なくとも概ね300オームのソースインピーダンスを変換するように構成されている、請求項1に記載の受信セクション。
- 前記第2のインピーダンス変成器(146)は、前記FETインピーダンスを概ね1オームと概ね3オームとの間の前記前置増幅器入力インピーダンスに変換するように構成されている、請求項1に記載の受信セクション。
- 前記第2のインピーダンス変成器(146)は、少なくとも概ね500,000オームのFETインピーダンスを前記前置増幅器入力インピーダンスに変換するように構成されている、請求項1に記載の受信セクション。
- 前記第2のインピーダンス変成器(146)は、前記ソースインピーダンスを、少なくとも概ね0.3デシベルのサイズを有する前記FET(150)の雑音円(152)の範囲内のインピーダンスに変換するように構成されている、請求項1に記載の受信セクション。
- 前記第2のインピーダンス変成器(146)は前記FETインピーダンスを概ね2オームの前記前置増幅器入力インピーダンスに変換するように構成されている、請求項1に記載の受信セクション。
- 前記FET(150)は概ね100オーム未満の最適反射係数を有する、請求項1に記載の受信セクション。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/163,440 | 2011-06-17 | ||
US13/163,440 US9018955B2 (en) | 2011-06-17 | 2011-06-17 | System and method for receiving magnetic resonance (MR) signals with an FET electrically between preamplifier terminals |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2013000591A JP2013000591A (ja) | 2013-01-07 |
JP6224304B2 true JP6224304B2 (ja) | 2017-11-01 |
Family
ID=47228595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012132485A Active JP6224304B2 (ja) | 2011-06-17 | 2012-06-12 | 磁気共鳴撮像(mri)システムの受信セクション |
Country Status (4)
Country | Link |
---|---|
US (1) | US9018955B2 (ja) |
JP (1) | JP6224304B2 (ja) |
CN (1) | CN102866368B (ja) |
DE (1) | DE102012105201A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9018955B2 (en) * | 2011-06-17 | 2015-04-28 | General Electric Company | System and method for receiving magnetic resonance (MR) signals with an FET electrically between preamplifier terminals |
US9000766B2 (en) * | 2011-10-18 | 2015-04-07 | General Electric Company | Radio frequency (RF) coil array for a magnetic resonance imaging system |
WO2016182407A1 (ko) * | 2015-05-14 | 2016-11-17 | 아탈라에르긴 | 자기 공명 영상 스캐너 |
WO2016195281A1 (ko) | 2015-05-21 | 2016-12-08 | 아탈라에르긴 | 경사자장을 발생시키기 위해 복수의 코일을 이용하는 경사자장 발생 모듈 |
US10571537B2 (en) | 2015-05-21 | 2020-02-25 | Bilkent University | Multi-purpose gradient array for magnetic resonance imaging |
DE102016204620B4 (de) | 2015-07-16 | 2019-07-04 | Siemens Healthcare Gmbh | MR-Körperspule |
EP3544499B1 (en) * | 2016-11-23 | 2024-05-29 | General Electric Company | Systems for a radio frequency coil for mr imaging |
WO2018098255A1 (en) * | 2016-11-23 | 2018-05-31 | General Electric Company | Systems for a radio frequency coil for mr imaging |
US10466332B2 (en) | 2017-02-21 | 2019-11-05 | General Electric Company | Systems and methods for an interleaved RF coil acquisition scheme |
TR201914968A1 (tr) | 2017-04-06 | 2022-02-21 | Ihsan Dogramaci Bilkent Ueniversitesi | Optimum faz kayması darbe genişlik modülasyonu modelinin uygulanması vasıtasıyla gradyan dizisi sisteminde minimum akım dalgalanmasının algoritması ve uygulanması. |
US11221383B2 (en) | 2017-07-17 | 2022-01-11 | Shanghai United Imaging Healthcare Co., Ltd. | Non-resonant magnetic resonance coil and magnetic resonance imaging system using the same |
WO2019015258A1 (en) | 2017-07-17 | 2019-01-24 | Shenzhen United Imaging Healthcare Co., Ltd. | MAGNETIC RESONANCE COIL AND MAGNETIC RESONANCE IMAGING SYSTEM USING THE SAME |
CN212817626U (zh) * | 2017-12-29 | 2021-03-30 | 深圳硅基仿生科技有限公司 | 射频信号检测装置及视网膜刺激器 |
US11269031B2 (en) * | 2018-12-12 | 2022-03-08 | Quality Electrodynamics, Llc | Magnetic resonance imaging (MRI) radio frequency (RF) coil tuning, matching, decoupling, and balun circuit |
US11555875B2 (en) * | 2021-03-24 | 2023-01-17 | Coilone, LLC | RF receive coil circuit for MRI systems |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4194179A (en) * | 1977-11-18 | 1980-03-18 | Becton, Dickinson & Company | Active antenna for medical telemetry monitoring systems |
JPS62251644A (ja) * | 1986-04-25 | 1987-11-02 | Mitsubishi Electric Corp | 高周波磁場検出器 |
JPH0693677B2 (ja) * | 1987-01-12 | 1994-11-16 | 富士通株式会社 | 識別タイミング制御回路 |
US4835485A (en) * | 1988-03-25 | 1989-05-30 | General Electric Company | Unconditionally-stable ultra low noise R.F. preamplifier |
US5433196A (en) * | 1993-06-02 | 1995-07-18 | The Board Of Trustees Of The University Of Illinois | Oxygen-17 NMR spectroscopy and imaging in the human |
JPH08191813A (ja) * | 1995-01-18 | 1996-07-30 | Toshiba Corp | 磁気共鳴装置のrfコイル用入力回路 |
DE19727524C1 (de) * | 1997-06-30 | 1999-03-04 | Siemens Ag | Hochfrequenzempfangseinheit für ein Magnetresonanzgerät |
CN1201166C (zh) * | 2000-02-24 | 2005-05-11 | 通用电器横河医疗系统株式会社 | 接收线圈和磁共振成像方法和设备 |
DE10313004B3 (de) * | 2003-03-24 | 2005-01-20 | Siemens Ag | Verfahren zur Modenbildung, Verfahren zur Modenbereitstellung und Empfangseinheit für ein Magnetresonanzgerät |
DE10325634B4 (de) * | 2003-06-06 | 2018-03-29 | Bruker Biospin Mri Gmbh | Rauscharmer Vorverstärker, insbesondere für die Kernspinresonanz(=NMR) |
DE102007034492B4 (de) * | 2007-07-24 | 2013-01-17 | Siemens Aktiengesellschaft | Hochfrequenz-Empfangseinrichtung für ein Magnetresonanztomographiegerät und Magnetresonanztomographiegerät |
CN102804595B (zh) * | 2009-06-19 | 2015-05-13 | 皇家飞利浦电子股份有限公司 | 改进用于mri的低噪声前置放大器的输入阻抗 |
US8138762B2 (en) * | 2009-08-24 | 2012-03-20 | Imris Inc. | Coil decoupling for an RF coil array |
US8362776B2 (en) * | 2009-09-30 | 2013-01-29 | General Electric Company | Apparatus for tuning magnetic resonance coil elements and method of making same |
US9018955B2 (en) * | 2011-06-17 | 2015-04-28 | General Electric Company | System and method for receiving magnetic resonance (MR) signals with an FET electrically between preamplifier terminals |
US9000766B2 (en) * | 2011-10-18 | 2015-04-07 | General Electric Company | Radio frequency (RF) coil array for a magnetic resonance imaging system |
-
2011
- 2011-06-17 US US13/163,440 patent/US9018955B2/en active Active
-
2012
- 2012-06-12 JP JP2012132485A patent/JP6224304B2/ja active Active
- 2012-06-15 DE DE102012105201A patent/DE102012105201A1/de not_active Withdrawn
- 2012-06-18 CN CN201210200346.7A patent/CN102866368B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
CN102866368A (zh) | 2013-01-09 |
CN102866368B (zh) | 2018-01-19 |
DE102012105201A1 (de) | 2012-12-20 |
JP2013000591A (ja) | 2013-01-07 |
US9018955B2 (en) | 2015-04-28 |
US20120319687A1 (en) | 2012-12-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6224304B2 (ja) | 磁気共鳴撮像(mri)システムの受信セクション | |
US9000766B2 (en) | Radio frequency (RF) coil array for a magnetic resonance imaging system | |
US10838026B2 (en) | Foldable coil array | |
US9513352B2 (en) | System and method for inductively communicating data | |
US8981774B2 (en) | Multi-element transmit RF chain with local automatic tune and match device | |
AU2017335998A1 (en) | Radio frequency coil tuning methods and apparatus | |
Fujita | New horizons in MR technology: RF coil designs and trends | |
JP2007511331A (ja) | フェーズドアレイ膝部コイル | |
US10060994B2 (en) | Z-segmented radio frequency antenna device for magnetic resonance imaging | |
CN106572811B (zh) | 高频线圈以及磁共振成像装置 | |
JP2017012742A (ja) | 磁気共鳴画像化システムおよび方法 | |
US10295624B2 (en) | Decoupling of parallel transmission arrays in magnetic resonance imaging | |
US6498947B2 (en) | rf shielding method and apparatus | |
Webb et al. | Tackling SNR at low-field: a review of hardware approaches for point-of-care systems | |
US8143893B2 (en) | Thin extended-cavity RF coil for MRI | |
US6538442B2 (en) | MRI system having RF shielding gradient coil structure | |
US8791696B2 (en) | System and method providing preamplifier feedback for magnetic resonance imaging | |
US10197646B2 (en) | Decoupling of parallel transmission arrays in magnetic resonance imaging | |
US20110140699A1 (en) | System and method for coil disabling in magnetic resonance imaging | |
Malzacher et al. | Reducing signal‐to‐noise ratio degradation due to coil coupling in a receiver array for 35Cl MRI at 9.4 T: A comparison of matching and decoupling strategies | |
US11747416B1 (en) | System and method for stabilizing surface coil | |
US10466332B2 (en) | Systems and methods for an interleaved RF coil acquisition scheme | |
US11686799B2 (en) | Method and apparatus for generation of combined magnetic resonance images | |
JP2024054738A (ja) | 高周波増幅装置、及び磁気共鳴イメージング装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20150605 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20160316 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20160419 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20160715 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20161227 |
|
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: 20170905 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20171005 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 6224304 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |