JP6636461B2 - マルチエコーk空間収集を使用するMRイメージング - Google Patents
マルチエコーk空間収集を使用するMRイメージング Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
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- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/4818—MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
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- G01R33/4828—Resolving the MR signals of different chemical species, e.g. water-fat imaging
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- G01R33/00—Arrangements or instruments for measuring magnetic variables
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- G01R33/48—NMR imaging systems
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- 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]
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- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
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- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
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- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
- G01R33/5616—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] using gradient refocusing, e.g. EPI
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- G—PHYSICS
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- G01R33/00—Arrangements or instruments for measuring magnetic variables
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- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
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- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
- G01R33/5617—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] using RF refocusing, e.g. RARE
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- 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
- G01R33/5615—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE]
- G01R33/5618—Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] using both RF and gradient refocusing, e.g. GRASE
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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
- G01R33/56509—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to motion, displacement or flow, e.g. gradient moment nulling
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Description
物体に、イメージングシーケンスを与えることによって、エコー信号を発生させるステップと、
エコー信号を収集するステップと、
収集したエコー信号からMR画像を再構成するステップとを含み、各エコー信号は、k空間ラインに帰し、k空間の一部において隣接して配置される幾つかのk空間ラインが、繰り返しサンプリングされ、当該幾つかのk空間ラインは、繰り返し毎に異なる順序でサンプリングされる。
磁気共鳴の励起のための少なくとも1つのRFパルスと、
複数のリフォーカシングRFパルスと、
各エコー信号の周波数エンコーディングのための複数の切り替え磁場勾配と、
各エコー信号の位相コーディングのための複数の切り替え磁場勾配とを含む。つまり、本発明の方法は、TSE又はスピンエコータイプのEPIといったそれ自体は知られている「ターボ」スピンエコーシーケンスと組み合わせて適用される。或いは、マルチエコーイメージングシーケンスは、勾配エコーシーケンスであってもよく、そのうちの1つのショットは、
磁気共鳴の励起のための少なくとも1つのRFパルスと、
磁気共鳴をリフォーカスし、各エコー信号を周波数エンコーディングするための複数の切り替え磁場勾配と、
各エコー信号を位相エンコーディングするための複数の切り替え磁場勾配とを含む。つまり、本発明の方法は、TFE又はEPIといったそれ自体は知られている「ターボ」勾配エコーシーケンスと組み合わせて適用される。
1回目の繰り返し:K1、K2、K3、K4、K5
2回目の繰り返し:K2、K1、K4、K3、K5
3回目の繰り返し:K2、K4、K1、K5、K3
4回目の繰り返し:K3、K5、K2、K4、K1
Claims (15)
- MRデバイスの検査ボリューム内に配置される物体のMRイメージング方法であって、
前記物体に、マルチエコーイメージングシーケンスを与えることによって、エコー信号を発生させるステップと、
前記エコー信号を収集するステップと、
収集された前記エコー信号からMR画像を再構成するステップと、
を含み、
前記物体に、前記マルチエコーイメージングシーケンスの幾つかのショットを与え、各ショットによって、一連のエコー信号が発生し、
各エコー信号は、k空間ラインに帰し、
(kx,ky)空間の一部において隣接して配置される幾つかのk空間ラインが、繰り返しサンプリングされ、前記幾つかのk空間ラインは、繰り返し毎に、異なる順序で、かつ、異なる選択されたスピン条件で、サンプリングされる、方法。 - 信号平均化が、前記幾つかのk空間ラインの前記繰り返しサンプリングによって行われ、k空間は、中心k空間部と、1つ以上の周辺k空間部とに分割され、前記中心k空間部における信号平均値の数が、前記1つ以上の周辺k空間部における信号平均値の数よりも高く、前記中心k空間部は、前記周辺k空間部よりも高いk空間密度でサンプリングされる、請求項1に記載の方法。
- k空間の少なくとも1つの部分は、可変密度でサンプリングされ、前記少なくとも1つの部分のサンプリング密度分布は、繰り返し間で異なる、請求項1又は2に記載の方法。
- 繰り返しサンプリングされるk空間ラインの少なくとも幾つかは、ランダムな順序でサンプリングされる、請求項1乃至3の何れか一項に記載の方法。
- 前記マルチエコーイメージングシーケンスは、スピンエコーシーケンスであり、そのうちの1つのショットは、
磁気共鳴の励起のための少なくとも1つのRFパルスと、
複数のリフォーカシングRFパルスと、
各エコー信号の周波数エンコーディングのための複数の切り替え磁場勾配と、
各エコー信号の位相コーディングのための複数の切り替え磁場勾配と、
を含む、請求項1乃至4の何れか一項に記載の方法。 - 前記マルチエコーイメージングシーケンスは、勾配エコーシーケンスであり、そのうちの1つのショットは、
磁気共鳴の励起のための少なくとも1つのRFパルスと、
磁気共鳴をリフォーカスし、各エコー信号を周波数エンコーディングするための複数の切り替え磁場勾配と、
各エコー信号を位相エンコーディングするための複数の切り替え磁場勾配と、
を含む、請求項1乃至5の何れか一項に記載の方法。 - k空間の少なくとも一部は、不完全にサンプリングされる、請求項1乃至6の何れか一項に記載の方法。
- 動き情報は、前記繰り返しサンプリングされたkxラインから収集される前記エコー信号から導出される、請求項1乃至7の何れか一項に記載の方法。
- 前記MR画像は、圧縮センシングを使用して、再構成される、請求項1乃至8の何れか一項に記載の方法。
- 前記マルチエコーイメージングシーケンスは、様々なエコー時間が各繰り返しにおいて選択されるDixonシーケンスであり、前記収集されたエコー信号への水及び脂肪からの信号寄与は分離される、請求項1乃至9の何れか一項に記載の方法。
- 前記エコー信号は、2つ以上の異なるエコー時間において収集され、前記エコー信号は、各エコー時間において、前記k空間ラインの異なる順序で収集される、請求項10に記載の方法。
- 水及び脂肪からの前記信号寄与は、前記MR画像を再構成する前記ステップにおいて組み合わされる、請求項10又は11に記載の方法。
- 前記マルチエコーイメージングシーケンスは、反転回復時間後の励起RFパルスが後に続く反転RFパルスを含む反転回復シーケンスである、請求項1乃至12の何れか一項に記載の方法。
- 検査ボリューム内に均一な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の様々な空間方向において切り替え磁場勾配を発生させる幾つかの勾配コイルと、前記検査ボリューム内に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、再構成ユニットとを含み、請求項1乃至12の何れか一項に記載の方法を行う、MRデバイス。
- 請求項1乃至12の何れか一項に記載の方法を行うための命令を含む、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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PCT/EP2015/061441 WO2015181091A2 (en) | 2014-05-27 | 2015-05-22 | Mr imaging using multi-echo k-space acquisition |
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EP2893363B1 (en) * | 2012-09-04 | 2020-08-19 | Koninklijke Philips N.V. | Propeller with dixon water fat separation |
EP3039441A1 (en) * | 2013-08-30 | 2016-07-06 | Koninklijke Philips N.V. | Dixon magnetic resonance imaging |
EP3324844A4 (en) | 2015-07-23 | 2018-08-22 | Shanghai United Imaging Healthcare Co., Ltd. | System and method for magnetic resonance imaging |
CN108603921B (zh) * | 2016-02-09 | 2021-08-10 | 皇家飞利浦有限公司 | 稳态磁共振指纹 |
EP3545325A1 (en) * | 2016-11-24 | 2019-10-02 | Koninklijke Philips N.V. | Mr imaging with dixon-type water/fat separation |
US10481232B2 (en) * | 2017-04-13 | 2019-11-19 | Canon Medical Systems Corporation | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
CN108324276B (zh) * | 2018-01-11 | 2021-07-30 | 上海东软医疗科技有限公司 | 磁共振成像方法和装置 |
CN108535674B (zh) * | 2018-02-06 | 2020-11-20 | 苏州朗润医疗系统有限公司 | 用于快速自旋回波的多次平均减轻伪影的方法 |
EP3686621A1 (en) * | 2019-01-23 | 2020-07-29 | Siemens Healthcare GmbH | Imaging method with variable density in k-space for multi-spin echo magnetic resonance imaging with different delay times after a preparation pulse and/or different echo times |
DE102019201385B3 (de) | 2019-02-04 | 2020-07-02 | Siemens Healthcare Gmbh | Verfahren zur Aufnahme von Magnetresonanzdaten, Magnetresonanzeinrichtung, Computerprogramm und elektronisch lesbarer Datenträger |
CN110082696B (zh) * | 2019-04-30 | 2021-06-08 | 上海东软医疗科技有限公司 | 一种多回波序列的成像方法和装置 |
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