JP2020534916A - 改善された脂肪シフト補正をもつディクソンタイプの水/脂肪分離mrイメージング - Google Patents
改善された脂肪シフト補正をもつディクソンタイプの水/脂肪分離mrイメージング Download PDFInfo
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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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- 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
- G01R33/56527—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to chemical shift effects
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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
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- 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
- G01R33/56545—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by finite or discrete sampling, e.g. Gibbs ringing, truncation artefacts, phase aliasing artefacts
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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
- G01R33/54—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
- G01R33/56554—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by acquiring plural, differently encoded echo signals after one RF excitation, e.g. correction for readout gradients of alternating polarity in EPI
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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
- G01R33/56563—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
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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
- G01R33/5659—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the RF magnetic field, e.g. spatial inhomogeneities of the RF magnetic field
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Abstract
Description
Claims (8)
- MR装置の検査ボリューム内の主磁場中に配される被検体のMRイメージング方法であって、
被検体をイメージングシーケンスに曝し、読み出し磁場勾配のバイポーラ対を使用して、2又はそれより多くの異なるエコー時間に少なくとも2組のエコー信号を生成するステップであって、エコー信号の一方の組は、第1のエコー時間(TE1)に生成され、エコー信号の他方の組は、第2のエコー時間(TE2)に生成される、ステップと、
前記被検体からエコー信号を取得するステップと、
前記第1のエコー時間(TE1)に帰するエコー信号から第1の画像を再構成し、前記第2のエコー時間(TE2)に帰するエコー信号から第2の画像を再構成するステップと、
前記再構成された第1及び第2の画像の脂肪シフトをそれぞれ補償することにより、補正された第1及び第2の画像を計算するステップと、
脂肪と水の共鳴スペクトル及び前記主磁場の空間バリエーションを含む信号モデルを使用して、前記第1及び第2の画像並びに前記補正された第1及び第2の画像に基づいて前記取得されたエコー信号の位相誤差を推定し、
前記推定された位相誤差を使用して、前記取得されたエコー信号に対する脂肪及び水の信号寄与を分離することにより、水画像及び/又は脂肪画像を再構成するステップと、
を有する方法。 - 前記位相誤差は、2つの個別の計算ステップにおいて推定され、当該推定は、一方の計算ステップにおいては前記第1及び第2の画像を使用して実行され、他方の計算ステップにおいては前記補正された第1及び第2の画像を使用して実行され、各ボクセル位置について、水からの寄与が当該ボクセル位置で優勢であることが判明した場合、前記第1及び第2の画像に基づいて推定された位相誤差が選択され、脂肪からの寄与が当該ボクセル位置で優勢であることが判明した場合には、前記補正された第1及び第2の画像に基づいて推定された位相誤差が選択される、請求項1に記載の方法。
- 前記信号モデルが脂肪のマルチピークスペクトルモデルを含む、請求項1又は2に記載の方法。
- 前記位相誤差を推定する前記ステップが、
各ボクセル位置での位相誤差のポテンシャル解を計算するステップと、
隣接するボクセル位置での位相誤差のバリエーションの空間平滑性を最大化することにより、前記位相誤差の1つの解を選択するステップと、
を有する、請求項1乃至3のいずれか1項に記載の方法。 - 水画像及び脂肪画像を再構成する前に、前記2つのエコー信号が、k空間の不良位置合わせについて補正される、請求項1乃至4のいずれか1項に記載の方法。
- 前記第1及び前記第2の画像並びに前記補正された第1及び第2の画像において、前記主磁場の不均一性により誘起されるシフトが補償される、請求項1乃至5のいずれか1項に記載の方法。
- 検査ボリューム内に均一な静的な主磁場を生成する少なくとも1つの主磁石コイルと、
前記検査ボリューム内のそれぞれ異なる空間方向に切り替え磁場勾配を生成する複数の勾配コイルと、
前記検査ボリューム内にRFパルスを生成し、及び/又は前記検査ボリューム内に配された被検体からMR信号を受信する、少なくとも1つのRFコイルと、
時間的に連続する前記RFパルス及び前記切り替え磁場勾配を制御する制御ユニットと、
受信したMR信号からMR画像を再構成する再構成ユニットと、
を有するMR装置であって、請求項1乃至5のいずれか1項に記載の方法の各ステップを実行するように構成されるMR装置。 - 請求項1乃至5のいずれか1項に記載の方法を実行するための命令を有する、MR装置上で実行されるコンピュータプログラム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP17193731.1A EP3462204A1 (en) | 2017-09-28 | 2017-09-28 | Dixon-type water/fat separation mr imaging with improved fat shift correction |
EP17193731.1 | 2017-09-28 | ||
PCT/EP2018/076035 WO2019063574A1 (en) | 2017-09-28 | 2018-09-26 | DIXON TYPE WATER / GREASE SEPARATION MAGNETIC RESONANCE IMAGING WITH ENHANCED FAT OFFSET CORRECTION |
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JP2020534916A true JP2020534916A (ja) | 2020-12-03 |
JP2020534916A5 JP2020534916A5 (ja) | 2021-10-28 |
JP7237066B2 JP7237066B2 (ja) | 2023-03-10 |
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US (1) | US11226385B2 (ja) |
EP (2) | EP3462204A1 (ja) |
JP (1) | JP7237066B2 (ja) |
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US20170038446A1 (en) * | 2014-04-24 | 2017-02-09 | Junmin LIU | Systems and methods for field mapping in magnetic resonance imaging |
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ES2578706T3 (es) | 2008-04-17 | 2016-07-29 | Advanced Mr Analytics Ab | Mejora de la obtención de imágenes por resonancia magnética en relación a la corrección de artefactos de desplazamiento químico y de inhomogeneidad de intensidad |
US8030923B2 (en) * | 2009-03-31 | 2011-10-04 | General Electric Company | Method and system to perform phase correction for species separation in magnetic resonance imaging |
WO2011108314A1 (ja) | 2010-03-03 | 2011-09-09 | 株式会社 日立メディコ | 磁気共鳴撮影装置 |
CN103635824A (zh) * | 2011-06-28 | 2014-03-12 | 皇家飞利浦有限公司 | 使用谱模型分离不同化学物类的mri |
EP2992351B1 (en) * | 2013-04-03 | 2019-08-07 | Koninklijke Philips N.V. | Dixon-type water/fat separation mri using high-snr in-phase image and lower-snr at least partially out-of-phase image |
US10234522B2 (en) * | 2013-09-16 | 2019-03-19 | Koninklijke Philips N.V. | MR imaging with dixon-type water/fat separation |
US10234523B2 (en) * | 2013-12-19 | 2019-03-19 | Koninklijke Philips N.V. | MRI with dixon-type water/fat separation with estimation of the main magnetic field variations |
JP6713988B2 (ja) * | 2014-09-26 | 2020-06-24 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 血流アーチファクトを抑制させたDixonMR撮像 |
US9880244B2 (en) | 2014-12-29 | 2018-01-30 | General Electric Company | Method and apparatus for separating chemical species in magnetic resonance imaging |
US10534057B2 (en) * | 2017-03-10 | 2020-01-14 | Maria Drangova | Method for dixon MRI, multi-contrast imaging and multi-parametric mapping with a single multi-echo gradient-recalled echo acquisition |
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- 2018-09-26 WO PCT/EP2018/076035 patent/WO2019063574A1/en unknown
- 2018-09-26 EP EP18773455.3A patent/EP3688479B1/en active Active
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US20170038446A1 (en) * | 2014-04-24 | 2017-02-09 | Junmin LIU | Systems and methods for field mapping in magnetic resonance imaging |
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Title |
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HOLGER EGGERS AND PETER BOERNERT: "Chemical Shift Encoding-Based Water-Fat Separation Methods", JOURNAL OF MAGNETIC RESONANCE IMAGING, vol. Vol. 40, Issue 2, JPN6022046638, 21 January 2014 (2014-01-21), US, pages 251 - 268, ISSN: 0004913011 * |
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EP3462204A1 (en) | 2019-04-03 |
WO2019063574A1 (en) | 2019-04-04 |
CN111164444A (zh) | 2020-05-15 |
US20200300948A1 (en) | 2020-09-24 |
CN111164444B (zh) | 2023-04-04 |
US11226385B2 (en) | 2022-01-18 |
EP3688479B1 (en) | 2024-02-14 |
JP7237066B2 (ja) | 2023-03-10 |
EP3688479A1 (en) | 2020-08-05 |
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