JP3892439B2 - Mri同期化を用いてフォーカスされた超音波システム - Google Patents
Mri同期化を用いてフォーカスされた超音波システム Download PDFInfo
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- JP3892439B2 JP3892439B2 JP2003505644A JP2003505644A JP3892439B2 JP 3892439 B2 JP3892439 B2 JP 3892439B2 JP 2003505644 A JP2003505644 A JP 2003505644A JP 2003505644 A JP2003505644 A JP 2003505644A JP 3892439 B2 JP3892439 B2 JP 3892439B2
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- 238000002604 ultrasonography Methods 0.000 title claims abstract description 40
- 238000002595 magnetic resonance imaging Methods 0.000 claims abstract description 132
- 230000004044 response Effects 0.000 claims abstract description 34
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- 238000001514 detection method Methods 0.000 claims description 4
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- 238000012285 ultrasound imaging Methods 0.000 description 2
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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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
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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
- G01R33/4804—Spatially selective measurement of temperature or pH
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- General Physics & Mathematics (AREA)
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Description
本発明は、一般的には、磁気共鳴画像(「MRI」)システムと、フォーカスされた超音波および/または超音波画像システム等のMRIシステムと共に使用される他の電気または電子システムとの間の干渉を最小化するためのシステムおよび方法に関し、より詳細には、例えば、フォーカスされた超音波処理の間、動作パラメータまたは他の電気アクティブ化(electrical activity)の変化を磁気共鳴画像サイクルのタイミングに同期化させるシステムおよび方法に関する。
癌腫瘍または良性腫瘍といった患者内部の標的組織領域に熱を向けて、壊死させるか、または他の場合では、熱エネルギーを用いて組織領域を処理するフォーカスされた超音波システムが提案されてきた。例えば、患者の体外部に配置された圧電トランスデューサが、超音波(組織領域を治療的に処置するために、患者の内部組織領域において、約20キロヘルツ(kHz)、より典型的には、50kHz〜5MHz(0.05〜5MHz)を有する音響波)等の高強度の音響波をフォーカスするために使用される。音響波は、腫瘍を切除するために使用され得、それにより、侵襲性手術に対する必要性を除去する。
本発明は、例えば、治療、画像化、診断、および/または、他の超音波処理の間に、概してMRIシステムと同期化して動作するシステムに関する。これらのシステムの動作は、システム間の干渉を最小化するためにMRIシステムの動作と同期化し得る。好適には、このようなシステムは、磁気共鳴画像法を用いてモニタリングされるフォーカスされた超音波処理を実行するため、ならびに、より好適には、アクティブ動作(超音波パラメータの変化、バースト送信、チャネルサンプリング等)を、MRIプロセスの敏感なセグメントとの干渉を最小化するために磁気共鳴画像法のタイミングと同期化させるためのこのようなシステムが構成される。
ここで、図面を参照すると、図1〜図3は、本発明によるMRI誘導フォーカス超音波システム10の好適な実施形態を示す。一般的には、システム10は、フォーカス超音波システム12およびMRIシステム50を含む。一般的には、フォーカス超音波システム12は、圧電トランスデューサ14、駆動回路16、およびコントローラ18(以後、FUSコントローラと呼ぶ)を含む。
Claims (16)
- 磁気共鳴画像(MRI)システムを用いてモニタリングされるフォーカスされた超音波処理を実行するためのシステムであって、該MRIシステムは、無線周波数(RF)信号の送信と該RF信号に応答して患者の体からの磁気共鳴(MR)応答信号の検出とを制御するためにタイミングシーケンスを使用し、
該システムは、
圧電トランスデューサと、
該トランスデューサに接続された駆動回路であって、該駆動回路は、駆動信号を該トランスデューサに供給するように構成されており、それにより該トランスデューサは、該患者の体の内部の標的組織領域に向かって音響エネルギーを放出する、駆動回路と、
該MRIシステムと同時に該トランスデューサをアクティブ化するように該駆動回路に接続されたコントローラであって、該コントローラは、該患者の体によって生成された該MR応答信号を検出する該MRIシステムとの干渉を最小化するタイミングシーケンスの間に1回以上該駆動信号のパラメータを変化させるように該駆動回路を制御するように構成されている、コントローラと、
該MRIシステムのタイミングシーケンスを決定するように構成された手段であって、該コントローラに接続された手段と
を含み、
該コントローラは、該MRIシステムがRF信号を送信する場合に限り、実質的なノイズを生成する該駆動信号のパラメータを変化させるように構成されている、システム。 - 前記コントローラは、前記駆動回路を制御するように構成されており、前記MRIシステムのタイミングシーケンスに基づいてパラメータを変化させる、請求項1に記載のシステム。
- 前記MRIシステムのタイミングシーケンスを決定するように構成された手段は、RF信号を送信すること、または、MR応答信号を検出することを該MRIシステムに命令するために、該MRIシステムによって生成されたタイミング信号をサンプリングするためのインターフェースを含む、請求項1に記載のシステム。
- 前記インターフェースは、前記MRIシステムのタイミングシーケンスサンプリングポートを接続するためのケーブルを含む、請求項3に記載のシステム。
- 前記MRIシステムのタイミングシーケンスを決定するように構成された手段は、
クロックのクロック速度に関連する同期化定数を獲得するように前記トランスデューサを駆動するクロックと該MRIシステムを駆動するクロックとを同期化するように構成された手段と、
該MRIシステムが最初にアクティブ化されるときと、該MRIシステムがRF信号の送信を開始するときとの間の遅延を決定するように構成された手段とを含み、
該コントローラは、該遅延によっておよび該同期化定数によって該MRIシステムの所定のサイクル周期を調整することによって該MRIシステムのタイミングシーケンスを決定するように構成されている、請求項1に記載のシステム。 - 前記MRIシステムのタイミングシーケンスを決定するように構成された手段は、いつRF信号が該MRIシステムによって送信されるかを決定するように構成された手段を含む、請求項1に記載のシステム。
- いつRF信号が前記MRIシステムによって送信されるかを決定するように構成された手段は、前記コントローラに接続されたアンテナであって、該MRIシステムによって送信されたRF信号を検出するアンテナを含む、請求項6に記載のシステム。
- 前記コントローラは、前記音響エネルギーを前記標的組織領域にフォーカスするための前記各駆動信号の振幅、周波数、および位相シフトのうちの少なくとも1つを制御するように構成されている、請求項1に記載のシステム。
- 前記コントローラは、前記MRIシステムが前記患者の体によって放出されたMR応答信号を検出する場合、前記各駆動信号の振幅、周波数、および位相シフトのうちの少なくとも1つを一定に維持するように構成されている、請求項8に記載のシステム。
- 前記システムは、
前記患者の体上に無線周波数(RF)パルスシーケンスを送信し、
該患者の体内部の標的組織領域において治療または診断処置を実行するために駆動回路からの電気駆動信号を用いて前記トランスデューサを動作し、
該RFパルスシーケンスに応答して、該患者の体内部の組織によって生成されたMR応答信号を検出し、
該MR応答信号を検出しながら該電気信号を一定に維持し、それにより、MR応答信号の検出との干渉を最小化するように構成されている、請求項1に記載のシステム。 - 前記トランスデューサの動作は、音響エネルギーを前記標的組織領域に向けるように電気駆動信号を用いて該トランスデューサを駆動することを含み、該電気信号を維持することは、前記RFパルスシーケンスが送信される場合に限り、該駆動信号のパラメータを変化させることを含む、請求項10に記載のシステム。
- 前記システムは、前記MRIシステムのタイミングシーケンスを決定するようにさらに構成されており、該システムは、前記MR応答信号の検出との干渉を最小化するタイミングシーケンスの間に1回以上前記駆動信号のパラメータのみを変化させる、請求項11に記載のシステム。
- 前記MRIシステムは、いつ前記RFシケーケンスが送信される、およびいつ前記MR応答信号が検出されるかを制御するタイミングシーケンスを使用し、該システムは、該MR応答信号を検出する該MRIシステムとの干渉を最小化する該タイミングシーケンスの間の1回以上前記トランスデューサを駆動する駆動信号をサンプリングすることによってパラメータを変化させる、請求項12に記載のシステム。
- 前記MRIシステムのタイミングシーケンスは、該MRIシステムによって生成されたタイミング信号をサンプリングすることによって決定される、請求項12に記載のシステム。
- 前記MRIシステムのタイミングシーケンスは、いつ前記RFパルスシーケンスを送信ステップが開始または終了するかを感知することによって決定される、請求項12に記載のシステム。
- 前記パラメータは、前記駆動信号の振幅、周波数、および位相シフトのうちの少なくとも1つを含む、請求項11に記載のシステム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/884,206 US6735461B2 (en) | 2001-06-19 | 2001-06-19 | Focused ultrasound system with MRI synchronization |
PCT/IL2002/000477 WO2002103380A1 (en) | 2001-06-19 | 2002-06-18 | Focused ultrasound system with mri synchronization |
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JP2004534578A JP2004534578A (ja) | 2004-11-18 |
JP3892439B2 true JP3892439B2 (ja) | 2007-03-14 |
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US (1) | US6735461B2 (ja) |
EP (1) | EP1397696B1 (ja) |
JP (1) | JP3892439B2 (ja) |
AT (1) | ATE440294T1 (ja) |
DE (1) | DE60233402D1 (ja) |
WO (1) | WO2002103380A1 (ja) |
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