JP4897212B2 - Ｍｒデータ収集中のｒｆ電力蓄積を低減する方法及び装置 - Google Patents
Ｍｒデータ収集中のｒｆ電力蓄積を低減する方法及び装置 Download PDFInfo
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- JP4897212B2 JP4897212B2 JP2004342477A JP2004342477A JP4897212B2 JP 4897212 B2 JP4897212 B2 JP 4897212B2 JP 2004342477 A JP2004342477 A JP 2004342477A JP 2004342477 A JP2004342477 A JP 2004342477A JP 4897212 B2 JP4897212 B2 JP 4897212B2
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- Expired - Lifetime
Links
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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
- G01R33/56—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
-
- 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
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
- G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver 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
- G01R33/561—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
- G01R33/28—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
Landscapes
- Physics & Mathematics (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)
- High Energy & Nuclear Physics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/723,311 US6989673B2 (en) | 2003-11-26 | 2003-11-26 | Method and apparatus to reduce RF power deposition during MR data acquisition |
| US10/723,311 | 2003-11-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2005152655A JP2005152655A (ja) | 2005-06-16 |
| JP2005152655A5 JP2005152655A5 (enExample) | 2008-01-17 |
| JP4897212B2 true JP4897212B2 (ja) | 2012-03-14 |
Family
ID=34592230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004342477A Expired - Lifetime JP4897212B2 (ja) | 2003-11-26 | 2004-11-26 | Ｍｒデータ収集中のｒｆ電力蓄積を低減する方法及び装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US6989673B2 (enExample) |
| JP (1) | JP4897212B2 (enExample) |
| DE (1) | DE102004057310A1 (enExample) |
| NL (1) | NL1027583C2 (enExample) |
Families Citing this family (54)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004061469A1 (en) * | 2003-01-07 | 2004-07-22 | Philips Intellectual Property & Standards Gmbh | High-frequency system for an mr apparatus with multiple transmit channels |
| US7671744B2 (en) * | 2003-03-03 | 2010-03-02 | Veroscan, Inc. | Interrogator and interrogation system employing the same |
| WO2005001502A1 (en) * | 2003-06-30 | 2005-01-06 | Koninklijke Philips Electronics N.V. | Control of specific absorption rate (asr) in mri |
| DE102004045691B4 (de) * | 2003-10-27 | 2009-10-01 | Siemens Ag | Verfahren zum Erzeugen eines homogenen hochfrequenten Magnetfelds in einem räumlichen Untersuchungsvolumen einer Magnetresonanzanlage |
| US7053618B2 (en) * | 2003-11-26 | 2006-05-30 | General Electric Company | Method and apparatus to generate an RF excitation consistent with a desired excitation profile using a transmit coil array |
| DE102004002009B4 (de) * | 2004-01-14 | 2006-07-06 | Siemens Ag | Verfahren zum Betrieb eines Magnetresonanzsystems, Magnetresonanzsystem und Computerprogrammprodukt |
| DE102004013422B4 (de) * | 2004-03-18 | 2009-02-19 | Siemens Ag | Verfahren zur Homogenisierung eines B1-Felds, Magnetresonanzsystem und Computerprogrammprodukt |
| US7619413B2 (en) | 2004-05-04 | 2009-11-17 | The General Hospital Corporation | Transmit-receive array for high field MRI |
| US7307419B2 (en) * | 2004-12-20 | 2007-12-11 | General Electric Company | Method and system for spatial-spectral excitation by parallel RF transmission |
| DE102005007895B4 (de) * | 2005-02-21 | 2016-06-30 | Siemens Healthcare Gmbh | Verfahren zur Kontrolle einer Hochfrequenzeinrichtung, Magnetresonanztomographiesystem und Hochfrequenz-Kontrolleinrichtung |
| US8368399B2 (en) * | 2005-05-05 | 2013-02-05 | New York University | Mode-scanning excitation magnetic resonance imaging method and system |
| JP4822850B2 (ja) | 2006-01-16 | 2011-11-24 | 株式会社日立製作所 | 磁気共鳴測定方法 |
| US7385396B2 (en) * | 2006-04-20 | 2008-06-10 | General Electric Company | SAR reduction in MR imaging with parallel RF transmission |
| EP2013636A1 (en) * | 2006-04-21 | 2009-01-14 | Koninklijke Philips Electronics N.V. | Magnetic resonance with time sequential spin excitation |
| JP5238689B2 (ja) * | 2006-04-21 | 2013-07-17 | 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 | Ｉチャネルリニア、ｑチャネルリニア、直交及び反直交モード間をスイッチングする高速コイルモードを伴う磁気共鳴 |
| US7508214B2 (en) * | 2007-05-21 | 2009-03-24 | Medrad, Inc. | Transmit-mode phased array coils for reduced SAR and artifact issues |
| US7992284B2 (en) | 2007-10-02 | 2011-08-09 | Advanced Magnet Lab, Inc. | Method of reducing multipole content in a conductor assembly during manufacture |
| US7616000B2 (en) * | 2007-11-15 | 2009-11-10 | General Electric Company | Ultra low output impedance RF power amplifier for parallel excitation |
| DE102007059522B4 (de) * | 2007-12-11 | 2009-09-17 | Siemens Ag | Magnetresonanzanlage mit verlustleistungsoptimiertem Betrieb |
| DE102008004256B4 (de) | 2008-01-14 | 2010-01-07 | Siemens Aktiengesellschaft | SAR-optimierte Ansteuerung eines Spulenarrays |
| US8169219B2 (en) | 2008-03-05 | 2012-05-01 | University Of Utah Research Foundation | Slice selective MRI excitation with reduced power deposition using multiple transmit channels |
| DE102008015054B3 (de) * | 2008-03-19 | 2010-01-28 | Universitätsklinikum Freiburg | MR-Verfahren zur selektiven Anregung |
| US8698495B2 (en) * | 2008-03-27 | 2014-04-15 | Koninklijke Philips N.V. | Flip angle imaging with improved B1 mapping for multi-RF transmit systems |
| WO2009128013A1 (en) * | 2008-04-16 | 2009-10-22 | Koninklijke Philips Electronics N.V. | Real-time local and global sar estimation for patient safety and improved scanning performance |
| US7808240B2 (en) * | 2008-04-30 | 2010-10-05 | General Electric Company | Apparatus and method for optimizing the spectra of parallel excitation pulses |
| DE102008029175B4 (de) * | 2008-06-19 | 2010-09-30 | Siemens Aktiengesellschaft | Verfahren zur Ermittlung einer Pulssequenz zur Ansteuerung einer Hochfrequenz-Sendespule |
| US8736265B2 (en) * | 2008-09-17 | 2014-05-27 | Koninklijke Philips N.V. | B1-mapping and B1L-shimming for MRI |
| US8148985B2 (en) * | 2008-10-15 | 2012-04-03 | Massachusetts Institute Of Technology | Method for reducing maximum local specific absorption rate in magnetic resonance imaging |
| DE102008061455B4 (de) * | 2008-12-10 | 2011-03-17 | Siemens Aktiengesellschaft | Verfahren und Vorrichtung zur Bestimmung einer vorbestimmten Signalamplitude bei MR-Messungen |
| JP2010207568A (ja) * | 2009-02-10 | 2010-09-24 | Toshiba Corp | 磁気共鳴イメージング装置 |
| DE102009014924B3 (de) * | 2009-03-25 | 2010-09-16 | Bruker Biospin Mri Gmbh | Rekonstruktion von Spektral- oder Bilddateien bei simultaner Anregung und Detektion in der Magnetischen Resonanz |
| CN102428382B (zh) * | 2009-04-02 | 2015-02-25 | 皇家飞利浦电子股份有限公司 | 通过k空间相关rf脉冲选择来降低并行发射中的sar |
| US8198891B2 (en) * | 2009-06-15 | 2012-06-12 | General Electric Company | System, method, and apparatus for magnetic resonance RF-field measurement |
| CN101968535B (zh) * | 2009-07-28 | 2015-12-16 | 西门子(深圳)磁共振有限公司 | 体线圈组件以及利用体线圈组件产生射频场的方法 |
| US20120161766A1 (en) * | 2009-09-17 | 2012-06-28 | Koninklijke Philips Electronics N.V. | Concurrent optimization of rf power and rf field uniformity in mri |
| EP2483703A2 (en) * | 2009-10-02 | 2012-08-08 | Koninklijke Philips Electronics N.V. | Mr imaging using multi-channel rf excitation |
| US8354844B2 (en) * | 2009-12-23 | 2013-01-15 | Universitaetsklinikum Freiburg | Method for data acquisition acceleration in magnetic resonance imaging (MRI) with N-dimensional spatial encoding using two or more receiver coil arrays and non-linear phase distributions |
| WO2011149087A1 (ja) * | 2010-05-27 | 2011-12-01 | 株式会社東芝 | 磁気共鳴イメージング装置 |
| US9588203B2 (en) * | 2010-12-07 | 2017-03-07 | New York University | Apparatus, method and computer-accessible medium for determination of electrical properties of tissues and materials using multiple radio frequency measurements |
| DE112011104494B4 (de) * | 2010-12-21 | 2025-07-03 | Regents Of The University Of Minnesota | Verfahren zur Reduzierung der deponierten Leistung bei Magnetresonanz- Tomografie unter Verwendung von Vielband-Pulsen und Vielkanal-Übertragung |
| WO2012117350A1 (en) * | 2011-03-03 | 2012-09-07 | Koninklijke Philips Electronics N.V. | Magnetic resonance using quasi-continuous rf irradiation |
| DE102011006872A1 (de) * | 2011-04-06 | 2012-10-11 | Siemens Aktiengesellschaft | Sendeeinrichtung zur Ansteuerung einer Hochfrequenzantenne einer Magnetresonanzeinrichtung, Leistungsverstärkereinheit und Verfahren zur Erzeugung eines amplitudenmodulierten Zielsignals |
| US8653818B2 (en) * | 2011-04-08 | 2014-02-18 | Siemens Aktiengesellschaft | Parallel transmission RF pulse design with local SAR constraints |
| US9086446B2 (en) * | 2011-11-29 | 2015-07-21 | General Electric Company | Method and system for B1 field mapping in magnetic resonance imaging |
| DE102012203453B4 (de) * | 2012-03-05 | 2014-07-03 | Siemens Aktiengesellschaft | Verfahren zur Ermittlung eines Satzes von B1-Feldkarten |
| DE102012212376B3 (de) * | 2012-03-20 | 2013-08-08 | Siemens Aktiengesellschaft | Ermittlung einer Magnetresonanzsystem-Ansteuersequenz |
| DE102012205297B4 (de) * | 2012-03-30 | 2015-02-12 | Siemens Aktiengesellschaft | Ermittlung einer Magnetresonanzsystem-Ansteuersequenz und Verfahren zum Betrieb eines Magnetresonanzsystems |
| KR101967241B1 (ko) | 2013-01-16 | 2019-04-09 | 삼성전자주식회사 | 무선 주파수 코일 장치, 이를 채용한 자기 공명 장치, 및 무선 주파수 코일 장치의 작동방법 |
| EP2972445B1 (en) * | 2013-03-13 | 2022-09-07 | Koninklijke Philips N.V. | Multi-element rf transmit coil for magnetic resonance imaging |
| JP6227270B2 (ja) * | 2013-04-09 | 2017-11-08 | 株式会社日立製作所 | 磁気共鳴イメージング装置および磁気共鳴イメージング方法 |
| EP3011353B1 (en) * | 2013-06-17 | 2017-02-15 | Koninklijke Philips N.V. | Magnetic resonance imaging subject support |
| DE102014211137A1 (de) * | 2014-06-11 | 2015-12-17 | Siemens Aktiengesellschaft | Magnetresonanzeinrichtung |
| US10917932B2 (en) * | 2016-09-26 | 2021-02-09 | Samsung Electronics Co., Ltd. | Method and apparatus for communication in next generation mobile communication system |
| US11231476B2 (en) * | 2019-04-26 | 2022-01-25 | Regents Of The University Of Minnesota | Accelerated magnetic resonance imaging acquisition using two-dimensional pulse segments as virtual receivers |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4682112A (en) * | 1984-10-10 | 1987-07-21 | Elscint Ltd. | NMR antenna and method for designing the same |
| US4689563A (en) * | 1985-06-10 | 1987-08-25 | General Electric Company | High-field nuclear magnetic resonance imaging/spectroscopy system |
| US4782298A (en) * | 1987-09-01 | 1988-11-01 | The Regents Of The University Of California | MRI QD RF coil having diode switched detuning circuit producing reduced artifact |
| US5349296A (en) * | 1993-07-09 | 1994-09-20 | Picker International, Inc. | Magnetic resonance scan sequencer |
| US5758646A (en) * | 1994-09-12 | 1998-06-02 | U.S. Philips Corporation | Magnetic resonance imaging method with pulse sequence optimization and device for such method |
| IL119558A (en) * | 1996-11-04 | 2005-11-20 | Odin Technologies Ltd | Multi-probe mri/mrt system |
| US6636038B1 (en) * | 1997-05-28 | 2003-10-21 | Siemens Aktiengesellschaft | Method and apparatus for controlling a pulse sequence in a magnetic resonance tomography system |
| JPH11253416A (ja) * | 1998-03-09 | 1999-09-21 | Toshiba Corp | 磁気共鳴イメージング装置 |
| JP3732365B2 (ja) * | 1999-09-08 | 2006-01-05 | ジーイー横河メディカルシステム株式会社 | スピン励起方法および装置並びに磁気共鳴撮像装置 |
| US7081750B1 (en) * | 2000-05-11 | 2006-07-25 | Fonar Corporation | Dynamic real-time magnetic resonance imaging sequence designer |
| US6618609B2 (en) * | 2001-03-30 | 2003-09-09 | Koninklifke Philips Electronics, N.V. | Flow adaptive guided determination of imaging parameters for 3D magnetic resonance angiography |
| US6411090B1 (en) * | 2001-07-02 | 2002-06-25 | Ge Medical Systems Global Technology Company, Llc | Magnetic resonance imaging transmit coil |
| BRPI0205891B1 (pt) * | 2001-08-21 | 2016-09-20 | Koninkl Philips Electronics Nv | sistema e método de formação de imagem de ressonância magnética |
| DE10155790B4 (de) * | 2001-11-14 | 2005-04-07 | Siemens Ag | Magnet-Resonanz-Bildgebung unter Verwendung einer interaktiven Kontrastoptimierung |
| EP1454156A1 (en) * | 2001-11-26 | 2004-09-08 | Koninklijke Philips Electronics N.V. | Magnetic resonance imaging method with reduced acoustic noise |
| US6879158B2 (en) * | 2002-05-17 | 2005-04-12 | General Electric Company | Method for accelerating focused excitation with multiple RF transmit coils |
| DE10354941B4 (de) * | 2002-12-02 | 2010-05-12 | Siemens Ag | Bestimmung der B1-Feldstärke bei MR-Messungen |
-
2003
- 2003-11-26 US US10/723,311 patent/US6989673B2/en not_active Expired - Lifetime
-
2004
- 2004-11-24 NL NL1027583A patent/NL1027583C2/nl not_active IP Right Cessation
- 2004-11-26 JP JP2004342477A patent/JP4897212B2/ja not_active Expired - Lifetime
- 2004-11-26 DE DE102004057310A patent/DE102004057310A1/de not_active Ceased
-
2005
- 2005-02-14 US US11/057,257 patent/US7075301B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US20050134267A1 (en) | 2005-06-23 |
| JP2005152655A (ja) | 2005-06-16 |
| US6989673B2 (en) | 2006-01-24 |
| US20050110487A1 (en) | 2005-05-26 |
| US7075301B2 (en) | 2006-07-11 |
| DE102004057310A1 (de) | 2005-07-21 |
| NL1027583A1 (nl) | 2005-05-27 |
| NL1027583C2 (nl) | 2007-11-27 |
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