JP6700261B2 - マルチショット磁気共鳴イメージングシステム及び方法 - Google Patents
マルチショット磁気共鳴イメージングシステム及び方法 Download PDFInfo
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Description
Claims (13)
- マルチショットイメージングによって被験体をイメージングするための磁気共鳴イメージングシステムであって、
複数のショットに対応するMR生データを収集するように構成される収集ユニットと、
前記MR生データから複数の折り畳み画像を生成するように構成されるイメージングユニットであって、前記複数の折り畳み画像の各々は前記MR生データのサブセットから生成される第一のイメージングユニットと
を有し、前記磁気共鳴イメージングシステムは、
各々の前記折り畳み画像の各々のピクセルの大きさを導出するように構成される導出ユニットと、
前記複数の折り畳み画像の何れか二つの折り畳み画像の類似性測定値に基づいて前記マルチショットイメージングの間、前記被験体のショット間の動きを検出するように構成される検出ユニットであって、前記検出ユニットは、前記測定される類似性を導出するように構成される第一の導出ユニットを更に有し、前記複数の折り畳み画像の何れか二つの折り畳み画像の類似性は前記二つの折り畳み画像のピクセルの大きさに基づいて導出される、検出ユニットと
を更に有する、磁気共鳴イメージングシステム。 - 前記類似性は非類似性又は類似性の測定の結果である、請求項1に記載の磁気共鳴イメージングシステム。
- 前記検出ユニットは、前記測定される類似性に基づいて前記折り畳み画像を少なくとも一つのスタティッククラスタにクラスタリングするように構成される第二の決定ユニットを更に有し、各々の前記スタティッククラスタの何れか二つの前記折り畳み画像は、前記二つの折り畳み画像がほぼ同じであることを示す前記類似性を有し、最大数の前記MR生データを有する前記スタティッククラスタは参照クラスタと称され、各々の残りのスタティッククラスタは非参照クラスタと称される、
請求項1に記載の磁気共鳴イメージングシステム。 - 前記検出ユニットは、
前記二つの折り畳み画像の間の前記類似性を最大化することによって前記参照クラスタにおける折り畳み画像に対する前記非参照クラスタにおける折り畳み画像の剛体運動のための動きパラメータを決定するように構成される第三の決定ユニット
を更に有する、請求項3に記載の磁気共鳴イメージングシステム。 - 前記動きパラメータに基づいて前記複数のショットに対応する前記MR生データから、又は前記参照クラスタの前記MR生データから、前記被験体のMR画像を再構成するように構成される第二のイメージングユニット
を更に有する、請求項4に記載の磁気共鳴イメージングシステム。 - 前記検出ユニットは、
前記複数の折り畳み画像の何れか二つの前記折り畳み画像の前記類似性測定値に基づいて前記類似性のマトリックスを導出し、前記マトリックスの各々の要素が、対応する二つの前記折り畳み画像の前記測定される類似性を示すように構成される第二の導出ユニット
を更に有し、
前記第二の決定ユニットは、前記類似性パラメータの前記マトリックスに基づいて前記折り畳み画像の前記参照クラスタを導出するように更に構成される、
請求項3に記載の磁気共鳴イメージングシステム。 - 前記検出ユニットの検出結果に従って得られる前記ショット間の動きなしでMR生データに基づいて前記被験体のMR画像を再構成するように構成される第二のイメージングユニット
を更に有する、請求項1に記載の磁気共鳴イメージングシステム。 - マルチショットイメージングによって被験体をイメージングするための磁気共鳴イメージング方法であって、
複数のショットに対応するMR生データを収集するステップと、
前記MR生データから複数の折り畳み画像を生成するステップであって、前記複数の折り畳み画像の各々は前記MR生データのサブセットから生成される、ステップと
を有し、前記磁気共鳴イメージング方法は、
各々の前記折り畳み画像の各々のピクセルの大きさを導出するステップと、
前記複数の折り畳み画像の何れか二つの折り畳み画像の類似性を測定するステップであって、前記複数の折り畳み画像の何れか二つの折り畳み画像の類似性は前記各々の折り畳み画像のピクセルの大きさに基づいて導出される、ステップと、
前記測定される類似性に基づいて前記マルチショットイメージングの間、前記被験体のショット間の動きを検出するステップと
を有する、磁気共鳴イメージング方法。 - 前記検出するステップは、
前記測定される類似性に基づいて前記折り畳み画像を少なくとも一つのスタティッククラスタにクラスタリングするステップであって、各々の前記スタティッククラスタの何れか二つの前記折り畳み画像は、前記二つの折り畳み画像がほぼ同じであることを示す前記類似性を有する、ステップと、
最大数の前記MR生データを有する前記スタティッククラスタを参照クラスタとして決定するステップと、
各々の残りのスタティッククラスタを非参照クラスタとして決定するステップと
を更に有する、請求項8に記載の磁気共鳴イメージング方法。 - 前記検出するステップは、
前記二つの折り畳み画像の間の前記類似性を最大化することによって前記参照クラスタにおける折り畳み画像に対する前記非参照クラスタにおける折り畳み画像の剛体運動のための動きパラメータを決定するステップ
を更に有する、請求項9に記載の磁気共鳴イメージング方法。 - 前記動きパラメータに基づいて前記複数のショットに対応する前記MR生データから、又は前記参照クラスタの前記MR生データから、前記被験体のMR画像を再構成するステップ
を更に有する、請求項10に記載の磁気共鳴イメージング方法。 - 前記検出するステップの検出結果に従って得られる前記ショット間の動きなしでMR生データに基づいて前記被験体のMR画像を再構成するステップ
を更に有する、請求項8に記載の磁気共鳴イメージング方法。 - コンピュータプログラムコード手段がコンピュータ上で実行されるとき、請求項9乃至12の何れか一項に記載の方法のステップを前記コンピュータに実行させるための前記コンピュータプログラムコード手段を有するコンピュータプログラムプロダクト。
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US6894494B2 (en) * | 2002-11-25 | 2005-05-17 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Method and device for correcting organ motion artifacts in MRI systems |
JP5063279B2 (ja) | 2007-09-27 | 2012-10-31 | 株式会社日立製作所 | 磁気共鳴装置 |
US8155389B2 (en) | 2007-10-02 | 2012-04-10 | The University Of Utah Research Foundation | Method and system for motion correction in imaging systems |
EP2411827A1 (en) | 2009-03-25 | 2012-02-01 | Koninklijke Philips Electronics N.V. | Magnetic resonance partially parallel imaging (ppi) with motion corrected coil sensitivities |
US8396267B2 (en) | 2009-11-04 | 2013-03-12 | International Business Machines Corporation | Correcting subject motion in multiple resolutions in magnetic resonance imaging |
US8427153B2 (en) | 2010-01-15 | 2013-04-23 | Beth Israel Deaconess Medical Center, Inc. | Method for motion correction in magnetic resonance imaging using radio frequency coil arrays |
US8699773B2 (en) * | 2010-10-21 | 2014-04-15 | Beth Israel Deaconess Medical Center | Method for image reconstruction using low-dimensional-structure self-learning and thresholding |
US9341693B2 (en) | 2011-03-17 | 2016-05-17 | Siemens Corporation | Motion compensated magnetic resonance reconstruction in real-time imaging |
EP2858559B1 (en) * | 2012-06-28 | 2021-01-20 | Duke University | Multi-shot scan protocols for high-resolution mri incorporating multiplexed sensitivity-encoding (muse) |
RU2015112295A (ru) | 2012-09-06 | 2016-10-27 | Конинклейке Филипс Н.В. | Система получения магнитно-резонансного изображения с обнаружением движения на основе навигатора |
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