NL1033706C2 - SAR-reductie in MR-afbeelding met parallelle RF-transmissie. - Google Patents
SAR-reductie in MR-afbeelding met parallelle RF-transmissie. Download PDFInfo
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- NL1033706C2 NL1033706C2 NL1033706A NL1033706A NL1033706C2 NL 1033706 C2 NL1033706 C2 NL 1033706C2 NL 1033706 A NL1033706 A NL 1033706A NL 1033706 A NL1033706 A NL 1033706A NL 1033706 C2 NL1033706 C2 NL 1033706C2
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- computer
- transmit
- parallel
- excitation
- pulse
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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
- G01R33/58—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
- G01R33/28—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
-
- 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
- G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
- G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
-
- 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
- G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
- G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
- G01R33/4836—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices using an RF pulse being spatially selective in more than one spatial dimension, e.g. a 2D pencil-beam excitation pulse
-
- 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
- G01R33/44—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
- G01R33/341—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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- High Energy & Nuclear Physics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US37940306 | 2006-04-20 | ||
| US11/379,403 US7385396B2 (en) | 2006-04-20 | 2006-04-20 | SAR reduction in MR imaging with parallel RF transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NL1033706A1 NL1033706A1 (nl) | 2007-10-23 |
| NL1033706C2 true NL1033706C2 (nl) | 2009-06-10 |
Family
ID=38618899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL1033706A NL1033706C2 (nl) | 2006-04-20 | 2007-04-17 | SAR-reductie in MR-afbeelding met parallelle RF-transmissie. |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7385396B2 (enExample) |
| JP (1) | JP2007289690A (enExample) |
| NL (1) | NL1033706C2 (enExample) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059522B4 (de) * | 2007-12-11 | 2009-09-17 | Siemens Ag | Magnetresonanzanlage mit verlustleistungsoptimiertem Betrieb |
| CN101896831B (zh) * | 2007-12-12 | 2015-01-28 | 皇家飞利浦电子股份有限公司 | 用于超高场mri的发射/接收线圈 |
| US8698495B2 (en) * | 2008-03-27 | 2014-04-15 | Koninklijke Philips N.V. | Flip angle imaging with improved B1 mapping for multi-RF transmit systems |
| US7808240B2 (en) * | 2008-04-30 | 2010-10-05 | General Electric Company | Apparatus and method for optimizing the spectra of parallel excitation pulses |
| CN102159965B (zh) * | 2008-09-17 | 2014-09-24 | 皇家飞利浦电子股份有限公司 | 用于mri的b1映射和b1l匀场 |
| US8148985B2 (en) * | 2008-10-15 | 2012-04-03 | Massachusetts Institute Of Technology | Method for reducing maximum local specific absorption rate in magnetic resonance imaging |
| US8319495B1 (en) | 2008-10-27 | 2012-11-27 | Yudong Zhu | Multi-port RF systems and methods for MRI |
| US8311641B2 (en) * | 2008-12-04 | 2012-11-13 | General Electric Company | Method and apparatus for generating a localized heating |
| 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 |
| US8049499B2 (en) * | 2009-03-20 | 2011-11-01 | Case Western Reserve University | Controlling multi-channel transmitter effects on specific absorption rate |
| US8319496B2 (en) * | 2009-04-01 | 2012-11-27 | Yigitcan Eryaman | Magnetic resonance method and apparatus for reducing RF heating in the patient |
| US9316710B2 (en) | 2009-04-01 | 2016-04-19 | Koninklijke Philips N.V. | SAR hotspot reduction by temporal averaging in parallel transmission MRI |
| EP2414858A1 (en) | 2009-04-02 | 2012-02-08 | Koninklijke Philips Electronics N.V. | Sar reduction in parallel transmission by k-space dependent rf pulse selection |
| EP2296000B1 (en) * | 2009-09-10 | 2014-03-12 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | Parallel excitation of nuclear spins with local SAR control |
| DE102010004514A1 (de) * | 2010-01-13 | 2011-07-14 | Siemens Aktiengesellschaft, 80333 | Dynamische Nachführung der HF-Justage bei parallelem Senden |
| US8970217B1 (en) | 2010-04-14 | 2015-03-03 | Hypres, Inc. | System and method for noise reduction in magnetic resonance imaging |
| 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 |
| US8558547B2 (en) | 2011-05-05 | 2013-10-15 | General Electric Company | System and method for magnetic resonance radio-frequency field mapping |
| CN103649767B (zh) | 2011-07-04 | 2016-09-21 | 皇家飞利浦有限公司 | 具有多通道阻抗匹配网络的磁共振成像系统 |
| US9702950B2 (en) * | 2011-08-17 | 2017-07-11 | Koninklijke Philips N.V. | Reducing the radio-frequency transmit field in a predetermined volume during magnetic resonance imaging |
| EP2615470A1 (en) * | 2012-01-12 | 2013-07-17 | Koninklijke Philips Electronics N.V. | MR imaging with B1 mapping |
| DE102012207132B3 (de) * | 2012-04-27 | 2013-09-05 | Siemens Aktiengesellschaft | Ansteuerung eines Magnetresonanzsystems unter Ermittlung von Sendeskalierungsfaktoren für eine vorgegebene Zielmagnetisierung |
| JP6285448B2 (ja) | 2012-10-23 | 2018-02-28 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | 磁気共鳴画像診断システム及び磁気共鳴画像診断方法 |
| KR101480413B1 (ko) * | 2012-12-04 | 2015-01-08 | 삼성전자주식회사 | B1 정보 획득 방법 및 장치 |
| US9625553B2 (en) | 2012-12-04 | 2017-04-18 | Samsung Electronics Co., Ltd. | Method and apparatus for acquiring B1 magnetic field information |
| JP6411063B2 (ja) * | 2014-05-07 | 2018-10-24 | キヤノンメディカルシステムズ株式会社 | 磁気共鳴イメージング装置及びｓａｒ算出方法 |
| DE102016209088A1 (de) * | 2016-05-25 | 2017-11-30 | Siemens Healthcare Gmbh | Überwachung einer Absorptionsrate induktiv gekoppelter Spulen |
| CN113093143B (zh) * | 2021-04-15 | 2022-06-10 | 电子科技大学 | 基于共形频控阵mimo雷达的降维参数估计方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE10150138B4 (de) * | 2001-10-11 | 2009-10-08 | Siemens Ag | Verfahren zur Magnetresonanz-Bildgebung |
| US6879158B2 (en) | 2002-05-17 | 2005-04-12 | General Electric Company | Method for accelerating focused excitation with multiple RF transmit coils |
| 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 |
| US6989673B2 (en) * | 2003-11-26 | 2006-01-24 | General Electric Company | Method and apparatus to reduce RF power deposition during MR data acquisition |
| US7307419B2 (en) | 2004-12-20 | 2007-12-11 | General Electric Company | Method and system for spatial-spectral excitation by parallel RF transmission |
| US20060132132A1 (en) | 2004-12-21 | 2006-06-22 | General Electric Company | Method and system for MR scan acceleration using selective excitation and parallel transmission |
-
2006
- 2006-04-20 US US11/379,403 patent/US7385396B2/en active Active
-
2007
- 2007-04-17 NL NL1033706A patent/NL1033706C2/nl not_active IP Right Cessation
- 2007-04-17 JP JP2007107706A patent/JP2007289690A/ja active Pending
Non-Patent Citations (2)
| Title |
|---|
| ZHU Y.: "RF Power Deposition and "g-factor" in Parallel Transmit", PROCEEDINGS OF THE INTERNATIONAL SOCIETY FOR MAGNETIC RESONANCE IN MEDICINE, ISMRM 14TH MEETING PROCEEDINGS, 6 May 2006 (2006-05-06), Seattle, Washington, USA, pages 599, XP002516570 * |
| ZHU Y: "Parallel Excitation With an Array of Transmit Coils", MAGNETIC RESONANCE IN MEDICINE, ACADEMIC PRESS, DULUTH, MN, US, vol. 51, 1 January 2004 (2004-01-01), pages 775 - 784, XP002420793, ISSN: 0740-3194 * |
Also Published As
| Publication number | Publication date |
|---|---|
| NL1033706A1 (nl) | 2007-10-23 |
| JP2007289690A (ja) | 2007-11-08 |
| US20070247155A1 (en) | 2007-10-25 |
| US7385396B2 (en) | 2008-06-10 |
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