JP4358834B2 - 磁気共鳴イメージングシステム - Google Patents
磁気共鳴イメージングシステム Download PDFInfo
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- JP4358834B2 JP4358834B2 JP2006091445A JP2006091445A JP4358834B2 JP 4358834 B2 JP4358834 B2 JP 4358834B2 JP 2006091445 A JP2006091445 A JP 2006091445A JP 2006091445 A JP2006091445 A JP 2006091445A JP 4358834 B2 JP4358834 B2 JP 4358834B2
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- 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
- G01R33/56563—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
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- 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
- G01R33/5613—Generating steady state signals, e.g. low flip angle sequences [FLASH]
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
Claims (11)
- バランス定常自由歳差運動(SSFP)のMRIシーケンスの間に一つの磁場マップを生成する磁気共鳴イメージング(MRI)システムにおいて、
RFコイルと傾斜磁場コイルに対して関連回路を介して接続され、マルチスキャンのための位相インクリメント又は周波数シフトを伴ってバランスSSFPのMRIのシーケンスを実行し、k空間上のSSFPデータのそれぞれ対応する複数のセットを収集するために構成されたプログラムコントローラと、
前記収集された複数のSSFPデータセットを信号絶対値だけを用いて演算処理して、一つの磁場マップを生成するデータプロセッサであって、前記k空間の前記複数のデータセットをそれぞれ対応する複数の絶対値画像に変換し、前記複数の絶対値画像の対応画素の絶対値を分析することにより一つの磁場マップを生成するデータプロセッサとを具備する磁気共鳴イメージングシステム。 - 前記データプロセッサは、前記マルチスキャンの結果として生じるそれぞれ対応する画素の強度を分析し、各画素位置で最小強度を生じさせる位相インクリメント又は周波数シフトの値を特定するように構成される請求項1記載のシステム。
- スピン歳差角のマップは、最小強度を示す複数画素を特定するために3点の2次関数近似を用いて発生される請求項1記載のシステム。
- 前記データプロセッサは、前記歳差角のマップの折り返しを除去するように構成される請求項3記載のシステム。
- 前記マルチスキャン各々の前記バランスSSFPのイメージングシーケンスを実行して、前記k空間の中央部分がk空間の他の部分より高密度になるk空間データを収集する請求項1記載のシステム。
- 前記データプロセッサは、前記収集されたk空間データを、磁場マップ用データとイメージング用データとに分類するように構成される請求項5記載のシステム。
- 前記磁場マップ用データは、前記k空間の中央部分を占め、前記イメージング用データより多くの位相インクリメント又は周波数シフトのステップ数を使って収集される請求項5記載のシステム。
- 前記データプロセッサは、前記磁場マップを用いて前記MRIシステムを調整して、前記磁場マップ中に示された磁場異常を補正するように構成される請求項1記載のシステム。
- 前記データプロセッサは、前記磁場マップを使って、一つの水細胞分離SSFP画像を生成するように構成される請求項1記載のシステム。
- 前記データプロセッサは、前記位相インクリメント又は周波数シフトされたSSFP信号を合成して、分離エコー信号S0、S−1を生成し、
前記エコー信号S0、S−1をk空間から画像空間に変換して、それぞれ分離画像I0、I−1を生成し、
前記分離エコー画像を位相補正し、
前記位相補正した分離画像を合成して、水SSFP画像と脂肪SSFP画像とを生成するように構成される請求項9記載のシステム。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/095,520 US7116105B1 (en) | 2005-04-01 | 2005-04-01 | Magnetic field mapping during SSFP using phase-incremented or frequency-shifted magnitude images |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2006280930A JP2006280930A (ja) | 2006-10-19 |
JP2006280930A5 JP2006280930A5 (ja) | 2009-07-23 |
JP4358834B2 true JP4358834B2 (ja) | 2009-11-04 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2006091445A Active JP4358834B2 (ja) | 2005-04-01 | 2006-03-29 | 磁気共鳴イメージングシステム |
Country Status (2)
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US (1) | US7116105B1 (ja) |
JP (1) | JP4358834B2 (ja) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7587231B2 (en) * | 2004-01-09 | 2009-09-08 | Toshiba America Mri, Inc. | Water fat separated magnetic resonance imaging method and system using steady-state free-precession |
JP4597857B2 (ja) * | 2005-12-26 | 2010-12-15 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Rfパルス印加方法およびmri装置 |
US7560925B1 (en) * | 2008-05-01 | 2009-07-14 | The Board Of Trustees Of The Leland Stanford Junior University | Multiple repetition time steady-state free precession imaging |
US20100019766A1 (en) * | 2008-07-28 | 2010-01-28 | Siemens Medical Solutions Usa, Inc. | System for Dynamically Compensating for Inhomogeneity in an MR Imaging Device Magnetic Field |
US7952353B2 (en) * | 2009-05-06 | 2011-05-31 | The Board Of Trustees Of The Leland Stanford Junior University | Method and apparatus for field map estimation |
CN102949189B (zh) * | 2011-08-31 | 2015-03-18 | 上海联影医疗科技有限公司 | 一种磁共振成像中用多通道数据组合实现水脂分离的方法 |
US10089729B2 (en) * | 2014-04-23 | 2018-10-02 | Toshiba Medical Systems Corporation | Merging magnetic resonance (MR) magnitude and phase images |
US10234521B2 (en) * | 2014-04-24 | 2019-03-19 | Junmin LIU | Systems and methods for field mapping in magnetic resonance imaging |
KR20170082600A (ko) | 2014-11-11 | 2017-07-14 | 하이퍼파인 리서치, 인크. | 로우 필드 자기 공명을 위한 펄스 시퀀스 |
KR101699528B1 (ko) | 2015-06-30 | 2017-01-24 | 삼성전자 주식회사 | 자기 공명 영상 장치 및 자기 공명 영상의 생성 방법 |
CN105662412B (zh) * | 2015-12-29 | 2019-09-10 | 东软医疗系统股份有限公司 | 一种磁共振系统的一阶匀场方法、装置及设备 |
US10591566B2 (en) | 2016-10-13 | 2020-03-17 | Regents Of The University Of Minnesota | Systems and methods for steady-state echo magnetic resonance imaging |
US11086124B2 (en) | 2018-06-13 | 2021-08-10 | Reavire, Inc. | Detecting velocity state of a device |
TW202012951A (zh) | 2018-07-31 | 2020-04-01 | 美商超精細研究股份有限公司 | 低場漫射加權成像 |
EP3617731A1 (en) | 2018-08-29 | 2020-03-04 | Erasmus University Medical Center Rotterdam | Magnetic resonance imaging based on transient response signals |
US11510588B2 (en) | 2019-11-27 | 2022-11-29 | Hyperfine Operations, Inc. | Techniques for noise suppression in an environment of a magnetic resonance imaging system |
EP3926355A1 (en) * | 2020-06-15 | 2021-12-22 | Koninklijke Philips N.V. | Estimation of b0 inhomogeneities for improved acquisition and/or reconstruction of magnetic resonance images |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5909119A (en) | 1995-08-18 | 1999-06-01 | Toshiba America Mri, Inc. | Method and apparatus for providing separate fat and water MRI images in a single acquisition scan |
US6275038B1 (en) * | 1999-03-10 | 2001-08-14 | Paul R. Harvey | Real time magnetic field mapping using MRI |
US6307368B1 (en) * | 1999-05-14 | 2001-10-23 | Board Of Trustees Of The Leland Stanford Junior University | Linear combination steady-state free precession MRI |
JP5002099B2 (ja) | 2001-08-31 | 2012-08-15 | 株式会社東芝 | 磁気共鳴イメージング装置 |
JP4049649B2 (ja) | 2002-10-01 | 2008-02-20 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 磁気共鳴撮影装置 |
US6856134B1 (en) * | 2003-05-23 | 2005-02-15 | The Board Of Trustees Of The Leland Stanford Junior University | Magnetic resonance imaging with fat-water signal separation |
US6906516B2 (en) | 2003-08-05 | 2005-06-14 | The Board Of Trustees Of The Leland Stanford Junior University | Artifact reduction in SSFP MRI using weighted sum of combined signals |
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2005
- 2005-04-01 US US11/095,520 patent/US7116105B1/en not_active Expired - Fee Related
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- 2006-03-29 JP JP2006091445A patent/JP4358834B2/ja active Active
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Publication number | Publication date |
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JP2006280930A (ja) | 2006-10-19 |
US7116105B1 (en) | 2006-10-03 |
US20060220645A1 (en) | 2006-10-05 |
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