JP2020522356A - デュアルエコーディクソン型水/脂肪分離mr撮像 - Google Patents
デュアルエコーディクソン型水/脂肪分離mr撮像 Download PDFInfo
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Abstract
Description
少なくとも1つの励起RFパルス及び切り替え磁場勾配を含む撮像シーケンスに物体をさらし、異なるエコー時間において2つのエコー信号、即ち、第1のエコー信号及び第2のエコー信号が生成されるステップと、
バイポーラ読み出し磁場勾配を使用して物体からエコー信号を収集するステップと、
第1のエコー信号から第1の単一エコー画像を再構成し、第2のエコー信号から第2の単一エコー画像を再構成するステップと、
それぞれのボクセル位置における第1の単一エコー画像と第2の単一エコー画像との位相差を使用して、各ボクセル位置における第1の単一エコー画像の位相をゼロエコー時間に外挿することによりゼロエコー時間画像を計算するステップと、
ゼロエコー時間画像におけるフローに起因する位相誤差を特定及び推定するステップと、
推定されたフローに起因する位相誤差に従って第1の単一エコー画像の位相を補正するステップと、
エコー信号から水画像及び/又は脂肪画像を再構成するステップと、
を含み、エコー信号への水及び脂肪からの寄与は、位相補正された第1の単一エコー画像及び第2の単一エコー画像を使用して分離される。
RF励起関連の位相、
受信チェーンに起因する位相、
化学シフトに起因する位相、
主磁場不均一性に起因する位相、
磁場勾配の切り替えに起因する位相、
フローに起因する位相。
Claims (12)
- MRデバイスの検査ボリューム内に置かれた物体のMR撮像方法であって、
少なくとも1つの励起RFパルス及び切り替え磁場勾配を含む撮像シーケンスに前記物体をさらして、異なるエコー時間において2つのエコー信号、即ち、第1のエコー信号及び第2のエコー信号が生成されるステップと、
バイポーラ読み出し磁場勾配を使用して前記物体から前記エコー信号を収集するステップと、
前記第1のエコー信号から第1の単一エコー画像を再構成し、前記第2のエコー信号から第2の単一エコー画像を再構成するステップと、
それぞれのボクセル位置における前記第1の単一エコー画像と前記第2の単一エコー画像との位相差を使用して、各ボクセル位置における前記第1の単一エコー画像の位相をゼロエコー時間に外挿することによりゼロエコー時間画像を計算するステップと、
前記ゼロエコー時間画像における局所的な位相変化からフローに起因する位相誤差を特定及び推定するステップと、
推定された前記フローに起因する位相誤差に従って前記第1の単一エコー画像の位相を補正するステップと、
前記エコー信号から水画像及び/又は脂肪画像を再構成するステップと、
を含み、
前記エコー信号への水及び脂肪からの寄与は、位相補正された前記第1の単一エコー画像及び前記第2の単一エコー画像を使用して分離される、方法。 - 使用される前記MRデバイスの受信チェーンによって、及び/又は、前記エコー信号の収集中の磁場勾配の切り替えに起因する前記単一エコー画像における位相誤差が、前記ゼロエコー時間画像を計算する前に補正される、請求項1に記載の方法。
- 前記励起RFパルスに起因する位相誤差が、前記ゼロエコー時間画像のハイパス空間フィルタリングにより除去される、請求項1又は2に記載の方法。
- 前記フローに起因する位相誤差は、前記ゼロエコー時間画像の位相を所定閾値とボクセル毎に比較することにより、前記ゼロエコー時間画像において特定される、請求項1から3のいずれか一項に記載の方法。
- 前記フローに起因する位相誤差は、前記ゼロエコー時間画像の隣接するボクセル間の位相差を所定閾値と比較することにより特定される、請求項1から3のいずれか一項に記載の方法。
- 前記フローに起因する位相誤差は、前記エコー信号の収集中に印加される前記バイポーラ読み出し磁場勾配の方向に整列したボクセルのセットを見つけ出すことにより、前記ゼロエコー時間画像において特定される、請求項4又は5に記載の方法。
- 前記ゼロエコー時間画像の振幅も、前記フローに起因する位相誤差の特定のために考慮される、請求項4から6のいずれか一項に記載の方法。
- 血管に起因する画像領域内の位相誤差のみが考慮される、請求項4から7のいずれか一項に記載の方法。
- 前記第1の単一エコー画像の位相補正は、前記ゼロエコー時間画像において特定及び推定された前記位相誤差をスケーリングし、前記第1の単一エコー画像の位相から減算することにより行われる、請求項1から8のいずれか一項に記載の方法。
- 前記水画像及び/又は前記脂肪画像は、2ポイントディクソン技術を使用して再構成される、請求項1から9のいずれか一項に記載の方法。
- 検査ボリューム内に均一静磁場を発生させる少なくとも1つの主磁石コイルと、前記検査ボリューム内で様々な空間方向に切り替え磁場勾配を発生させる幾つかの傾斜磁場コイルと、前記検査ボリューム内でRFパルスを発生させる及び/又は前記検査ボリューム内に配置される物体からのMR信号を受信する少なくとも1つのRFコイルと、RFパルス及び切り替え磁場勾配の時間的連続を制御する制御ユニットと、受信した前記MR信号からMR画像を再構成する再構成ユニットと、を含み、請求項1から10のいずれか一項に記載の方法のステップを行う、MRデバイス。
- 請求項1から10のいずれか一項に記載の方法を実行するための命令を含む、MRデバイス上で実行される、コンピュータプログラム。
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EP17175127.4A EP3413070A1 (en) | 2017-06-09 | 2017-06-09 | Dual-echo dixon-type water/fat separation mr imaging |
EP17175127.4 | 2017-06-09 | ||
PCT/EP2018/065175 WO2018224653A1 (en) | 2017-06-09 | 2018-06-08 | Dual-echo dixon-type water/fat separation mr imaging |
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WO2020133527A1 (zh) * | 2018-12-29 | 2020-07-02 | 深圳先进技术研究院 | 基于磁共振图像的水脂分离方法、装置、设备及存储介质 |
US11163027B2 (en) * | 2019-06-05 | 2021-11-02 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
EP3859366A1 (en) | 2020-01-30 | 2021-08-04 | Koninklijke Philips N.V. | Mr imaging using dixon-type water/fat separation with suppression of flow-induced leakage and/or swapping artifacts |
CN113030814B (zh) * | 2021-03-09 | 2021-12-21 | 电子科技大学 | 一种磁共振k空间数据校正的方法 |
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CN110720047A (zh) | 2020-01-21 |
WO2018224653A1 (en) | 2018-12-13 |
EP3635426A1 (en) | 2020-04-15 |
CN110720047B (zh) | 2022-05-31 |
US10996301B2 (en) | 2021-05-04 |
JP6912603B2 (ja) | 2021-08-04 |
US20200132794A1 (en) | 2020-04-30 |
EP3413070A1 (en) | 2018-12-12 |
EP3635426B1 (en) | 2022-08-10 |
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