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
- Publication number
- 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
- Authority
- JP
- Japan
- Prior art keywords
- computer
- excitation
- coil
- readable storage
- storage medium
- 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
- 238000000034 method Methods 0.000 title description 16
- 230000005284 excitation Effects 0.000 claims description 121
- 238000013461 design Methods 0.000 claims description 32
- 238000003384 imaging method Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 24
- 238000009825 accumulation Methods 0.000 claims description 12
- 230000004807 localization Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 230000002123 temporal effect Effects 0.000 claims description 6
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 description 15
- 230000005415 magnetization Effects 0.000 description 13
- 230000001133 acceleration Effects 0.000 description 11
- 238000005070 sampling Methods 0.000 description 10
- 238000004088 simulation Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 9
- 230000035945 sensitivity Effects 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 238000002595 magnetic resonance imaging Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000013459 approach Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 230000010287 polarization Effects 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000012491 analyte Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012887 quadratic function Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005279 excitation period Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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)
Description
B=∇×A
及び
E=−dA/dt
に関連する。この場合、式12の|E(x,pΔt)|2の項は、次式で評価することができ、
72 送信コイル
74 RF増幅器
76 励起ボリューム
78 被検体
Claims (9)
- コンピュータ可読記憶媒体(26、28、30)であって、該媒体上に格納され、コンピュータ(12、24、22、32、36)によって実行されたときに該コンピュータに、
送信コイルアレイ(70)の各送信コイルについてB1磁場マップを収集し、
前記B1磁場マップからコンポジットB1磁場の時間空間的変動を求め、
MRイメージング中のRF電力蓄積が低減されるようにそれぞれの送信コイル(72)に対応した異なるRFパルスシーケンスを発生する、
ように行わせる命令セットを表すコンピュータプログラムを有し、
前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、複数の送信コイル(72)によって全体のRF発生に対して加えられる効果的な空間的重み付けを求め、結合誘起されたコイル間相関関係を折り込むように前記複数のRFパルス波形を設計させ、
l番目のコイルに対する前記空間周波数重み付けWl(k)は、
Wl(k)=Ukx,l(kx)・Ukz(kz)
によって計算され、
ここで、
g(x)=gx(x)・gz(z)であり、
g(x)は、励起プロフィールを定める項であることを特徴とするコンピュータ可読記憶媒体(26、28、30)。 - 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、望ましい励起プロフィールから前記送信コイルアレイによって生成されるRF励起プロフィールの実質的な偏差を生じることなく、イメージングボリュームにわたるRF電力蓄積を最小化させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが、前記コンピュータ(12、24、22、32、36)にRF電力蓄積を最小化させ、任意の送信コイルアレイ幾何形状(70、72)に適用で可能な原理を具現化することを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが、前記コンピュータ(12、24、22、32、36)に前記送信コイル(70、72)の少なくとも有効B1磁場に基づく送信コイル(70)のためのRFパルス方式を決定させ、各有効B1磁場が送信コイル(70)と少なくとも1つの別の送信コイル(72)との相互結合を反映することを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットは更に、前記コンピュータ(12、24、22、32、36)に、前記送信コイル(70)を用いる並列RF励起が望ましい励起プロフィールに一致する結果を生成するように各パルスシーケンスを設計させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、2D又は3DのMRデータを収集させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記送信コイルアレイ(70)が、直線状に配置された複数の送信コイル(72)を含むことを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 各送信コイル(72)が、専用のRF増幅器(74)によって駆動され、
前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、前記送信コイル(72)の独立制御によってMRイメージング中の被検体へのRF電力蓄積を調整させることを特徴とする請求項1乃至7のいずれかに記載のコンピュータ可読記憶媒体(26、28、30)。 - 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、望ましい励起プロフィールに一致するRF励起と被検体へのSAR低減とを同時に達成させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
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 (ja) | 2008-01-17 |
JP4897212B2 true JP4897212B2 (ja) | 2012-03-14 |
Family
ID=34592230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004342477A Active 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 (ja) |
JP (1) | JP4897212B2 (ja) |
DE (1) | DE102004057310A1 (ja) |
NL (1) | NL1027583C2 (ja) |
Families Citing this family (53)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4376791B2 (ja) * | 2003-01-07 | 2009-12-02 | 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 | 複数の送信チャネルを有するmr機器用の高周波システム |
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 |
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 |
JP5213849B2 (ja) * | 2006-04-21 | 2013-06-19 | 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 | 時間シーケンスのスピン励起による磁気共鳴 |
US7508214B2 (en) * | 2007-05-21 | 2009-03-24 | Medrad, Inc. | Transmit-mode phased array coils for reduced SAR and artifact issues |
US8001672B2 (en) | 2007-10-02 | 2011-08-23 | Advanced Magnet Lab, Inc | Methods of fabricating a conductor assembly having a curvilinear arcuate shape |
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 |
EP2260317A2 (en) * | 2008-03-27 | 2010-12-15 | Koninklijke Philips Electronics 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 |
DE112009002242B4 (de) | 2008-09-17 | 2019-05-16 | Philips Gmbh | Verfahren und Gerät zur Durchführung einer integrierten Homogenisierung des B1-Feldes |
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 |
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 |
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 |
EP2902794A1 (en) * | 2009-10-02 | 2015-08-05 | Koninklijke Philips 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 |
RU2577254C2 (ru) * | 2011-03-03 | 2016-03-10 | Конинклейке Филипс Н.В. | Магнитный резонанс, использующий квазинепрерывное рч излучение |
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 |
RU2015143468A (ru) * | 2013-03-13 | 2017-04-19 | Конинклейке Филипс Н.В. | Многоэлементная радиочастотная передающая катушка для магнитно-резонансной визуализации |
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 |
US10184996B2 (en) * | 2013-06-17 | 2019-01-22 | Koninklijke Philips N.V. | Magnetic resonance imaging subject support |
DE102014211137A1 (de) * | 2014-06-11 | 2015-12-17 | Siemens Aktiengesellschaft | Magnetresonanzeinrichtung |
EP4195867A1 (en) * | 2016-09-26 | 2023-06-14 | 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 |
KR20040027944A (ko) * | 2001-08-21 | 2004-04-01 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 여기 안테나 시스템을 갖는 자기 공명 장치 |
DE10155790B4 (de) * | 2001-11-14 | 2005-04-07 | Siemens Ag | Magnet-Resonanz-Bildgebung unter Verwendung einer interaktiven Kontrastoptimierung |
JP4360912B2 (ja) * | 2001-11-26 | 2009-11-11 | 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 | 音響ノイズが低減された磁気共鳴撮像方法 |
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 active Active
- 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 |
---|---|
DE102004057310A1 (de) | 2005-07-21 |
US20050110487A1 (en) | 2005-05-26 |
JP2005152655A (ja) | 2005-06-16 |
US7075301B2 (en) | 2006-07-11 |
US6989673B2 (en) | 2006-01-24 |
NL1027583C2 (nl) | 2007-11-27 |
NL1027583A1 (nl) | 2005-05-27 |
US20050134267A1 (en) | 2005-06-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4897212B2 (ja) | Mrデータ収集中のrf電力蓄積を低減する方法及び装置 | |
JP4954464B2 (ja) | 送信コイルアレイを用いて望ましい励起プロフィールに一致するrf励起を発生する方法及び装置 | |
US7385396B2 (en) | SAR reduction in MR imaging with parallel RF transmission | |
JP6554729B2 (ja) | 縮小視野磁気共鳴イメージングのシステムおよび方法 | |
JP4901937B2 (ja) | 勾配エコーを伴う磁気共鳴画像形成におけるt2コントラスト | |
JP5078141B2 (ja) | 磁気共鳴イメージング装置 | |
US8049497B2 (en) | MRI RF encoding using multiple transmit coils | |
KR101821487B1 (ko) | 보상 확산 기반 확산 영상 | |
US6323646B1 (en) | Method and apparatus for producing diffusion weighted MR images | |
US6239599B1 (en) | Method and apparatus for identifying errors in magnetic resonance imaging examinations | |
US9086446B2 (en) | Method and system for B1 field mapping in magnetic resonance imaging | |
US7808240B2 (en) | Apparatus and method for optimizing the spectra of parallel excitation pulses | |
US6469505B1 (en) | Method and apparatus to reduce perturbation field effects in MR images by restricting the region of interest | |
JP4325791B2 (ja) | 画像再構成するためのコンピュータ・プログラム・コードでエンコードされた記憶媒体及び画像再構成するための装置 | |
US5602480A (en) | Inspection method and apparatus using nuclear magnetic resonance | |
Grissom | Improving high-field MRI using parallel excitation | |
US7620440B2 (en) | Direct temporal encoding of spatial information | |
US7323872B1 (en) | Method and apparatus of directly measuring cross-axis eddy currents for MR scanner calibration | |
US11686802B2 (en) | Method and magnetic resonance apparatus for diffusion image acquisition with motion offsetting and navigation-dependent segmentation | |
JP4694713B2 (ja) | Rfパルス調整方法および装置並びに磁気共鳴撮影装置 | |
JPH08595A (ja) | 核磁気共鳴を用いた検査装置および検査方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20071122 |
|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20071122 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20101118 |
|
RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20101124 |
|
RD04 | Notification of resignation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7424 Effective date: 20101124 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20101130 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20110228 |
|
RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20110228 |
|
RD04 | Notification of resignation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7424 Effective date: 20110228 |
|
A602 | Written permission of extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A602 Effective date: 20110304 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20110330 |
|
A602 | Written permission of extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A602 Effective date: 20110404 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20110513 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20110607 |
|
A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20110824 |
|
A602 | Written permission of extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A602 Effective date: 20110829 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20111109 |
|
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: 20111129 |
|
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: 20111222 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 4897212 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150106 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 |
|
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 |
|
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 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |