JP4834724B2 - 磁気共鳴エラストグラフィを用いた肺の弾性特性の画像化 - Google Patents
磁気共鳴エラストグラフィを用いた肺の弾性特性の画像化 Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0048—Detecting, measuring or recording by applying mechanical forces or stimuli
- A61B5/0051—Detecting, measuring or recording by applying mechanical forces or stimuli by applying vibrations
-
- 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
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/56358—Elastography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
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Description
本願は、2005年4月26日付で出願された、発明の名称が「熱分極された3He磁気共鳴エラストグラフィ:初期の実現可能性(Thermally Polarized 3He Magnetic Resonance Elastography:Initial Feasibility)」である、米国特許仮出願第60/674,818号明細書に基づく。
本発明は、米国国立衛生研究所によって与えられた付与番号第NIH EB001981、CA91959に基づいて、政府の支援でなされた。米国政府は、本発明に一定の権利を有する。
本発明の分野は、核磁気共鳴画像化方法およびシステムである。より詳細には、本発明は、ヘリウム3またはキセノン129といった希ガスを用いて肺を画像化することに関する。
本発明は、磁気共鳴エラストグラフィを用いて哺乳類の肺の機械的特性を画像化する方法であり、より詳細には、肺が希ガスで満たされたときの機械的特性の画像化である。
特に図1を参照すると、本発明の好ましい実施態様がMRIシステムに採用される。MRIシステムは、ディスプレイ12及びキーボード14を有するワークステーション10を備える。ワークステーション10は、市販のオペレーティングシステムを走らせている市販のプログラマブルマシンであるプロセッサ16を備える。ワークステーション10は、スキャン指示をMRIシステムに入力できるようにするオペレータインタフェースを提供する。
Claims (8)
- 磁気共鳴画像(NMR)システムを用いて患者の肺の画像を生成する方法であって、
a)前記MRIシステムと、肺組織からのNMR応答を求めるパルスシーケンスとを用いて、前記肺から画像データを取得するステップと、
b)ステップa)で取得された前記画像データから、各イメージピクセルにおける肺組織の密度を示す肺密度マップを再構成するステップと、
c)NMR応答性ガスを含むガスで前記肺を満たすステップと、
d)前記MRIシステムと、前記NMR応答性ガスからNMR応答を求める第2のパルスシーケンスとを用いて、前記肺から磁気共鳴エラストグラフィ(MRE)画像データを取得するステップと、
e)ステップd)で取得された前記MRE画像データから、各イメージピクセルにおける歪み波形の周波数を示す空間周波数マップを再構成するステップと、
f)前記肺密度マップと前記空間周波数マップから、各イメージピクセルにおける機械的剛性を示す剪断弾性率画像を算出するステップと、
を含む、患者の肺の画像を生成する方法。 - ステップb)で用いられる前記パルスシーケンスが、水素プロトンの密度を示す、請求項1に記載の方法。
- 前記NMR応答性ガスが希ガスである、請求項1に記載の方法。
- 前記NMR応答性ガスが過分極ヘリウムである、請求項3に記載の方法。
- ステップd)が、
d)i)選択された周波数で、前記肺に交番応力を加えることと、
d)ii)前記第2のパルスシーケンスを用いてMRE画像データを取得することと、
d)iii)前記第2のパルスシーケンスを用いて、前記交番応力を加えずに、MRE基準画像データを取得することと、
を含み、
ステップe)が、
e)i)ステップd)ii)で取得された前記MRE画像データを用いて位相画像を再構成することと、
e)ii)ステップd)iii)で取得された前記MRE基準画像データを用いて基準位相画像を再構成することと、
e)iii)前記基準位相画像を前記位相画像から差し引くことによって位相差画像を生成することと、
e)iv)前記位相差画像から前記空間周波数マップを算出することと、
を含む、請求項1に記載の方法。 - ステップd)が、
d)i)前記肺を包含する胸壁に対向して音響デバイスを配置することと、
d)ii)選択された周波数で前記胸壁内に縦応力波を生成するために、MRE画像データの取得中に、前記音響デバイスを作動させることと、
を含む、請求項1に記載の方法。 - 前記の選択された周波数が50〜200Hzの範囲内にある、請求項6に記載の方法。
- 前記音響ドライバが前記患者のわきの下に対向して配置されている、請求項6に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US67481805P | 2005-04-26 | 2005-04-26 | |
US60/674,818 | 2005-04-26 | ||
PCT/US2006/015232 WO2006116178A1 (en) | 2005-04-26 | 2006-04-24 | Imaging elastic properties of the lung with magnetic resonance elastography |
Publications (2)
Publication Number | Publication Date |
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JP2008539005A JP2008539005A (ja) | 2008-11-13 |
JP4834724B2 true JP4834724B2 (ja) | 2011-12-14 |
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JP2008508964A Expired - Fee Related JP4834724B2 (ja) | 2005-04-26 | 2006-04-24 | 磁気共鳴エラストグラフィを用いた肺の弾性特性の画像化 |
Country Status (5)
Country | Link |
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US (1) | US7991449B2 (ja) |
EP (1) | EP1875263B1 (ja) |
JP (1) | JP4834724B2 (ja) |
DE (1) | DE602006005348D1 (ja) |
WO (1) | WO2006116178A1 (ja) |
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WO2005112757A2 (de) * | 2004-05-17 | 2005-12-01 | Thomas Rupprecht | Verfahren zur diagnose funktioneller lungenerkrankungen |
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EP2606369B1 (en) * | 2010-08-17 | 2020-11-11 | Université Paris-Saclay | Apparatus and method for generating mechanical waves into living bodies, system and method for mapping an organ or tissue and system and method for characterising the mechanical properties of said organ or tissue |
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KR20140036650A (ko) | 2012-09-17 | 2014-03-26 | 삼성전자주식회사 | 1차원 초음파 프로브를 이용하여 조직의 탄성을 분석하는 방법, 장치 및 시스템. |
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US6915151B2 (en) * | 2001-02-08 | 2005-07-05 | Trustees Of The University Of Pennsylvania | Quantitative pulmonary imaging |
US7174200B2 (en) * | 2001-04-13 | 2007-02-06 | University Of Virginia Patent Foundation | Optimized high-speed magnetic resonance imaging method and system using hyperpolarized noble gases |
WO2004086969A1 (en) * | 2003-03-27 | 2004-10-14 | The Government Of The United States Of America, Asrepresented By The Secretary Of Health And Human Services | In vivo brain elasticity measurement by magnetic resonance elastography with vibrator coil |
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