JP2020175194A - 磁気共鳴イメージング装置及び磁気共鳴イメージング方法 - Google Patents
磁気共鳴イメージング装置及び磁気共鳴イメージング方法 Download PDFInfo
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- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
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- 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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- 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
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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
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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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- G01R33/5615—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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- G01R33/48—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
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/56341—Diffusion imaging
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Abstract
Description
セグメント間の動きは、著しいアーチファクトをもたらす可能性がある。例えば、動きに起因するリードアウトセグメント間の位相ずれは、ぼけやゴースト発生などの画像アーチファクトの原因となり得る。
540 MRIシーケンスコントローラ
542 MRIデータプロセッサ
Claims (9)
- 複数のk空間領域に分けて複数の第1の収集を行って複数の第1のk空間データを収集し、前記複数の第1の収集それぞれに対応する複数の第2の収集を行って複数の第2のk空間データを収集するシーケンス制御部と、
前記複数の第2のk空間データのうち一つのk空間データと、前記複数の第2のk空間データとに基づいて、位相マップを生成し、
前記複数の第1のk空間データと前記位相マップとに基づいて、複数の第3のk空間データを生成し、
前記複数の第3のk空間データに対して平均処理を行って第4のk空間データを生成し、
前記第4のk空間データに基づいて磁気共鳴画像を生成する生成部と
を備える磁気共鳴イメージング装置。 - 前記第1の収集の個数は、前記複数のk空間領域の個数を下回らない、請求項1に記載の磁気共鳴イメージング装置。
- 前記シーケンス制御部は、k空間の中央領域で、前記中央領域以外の領域と比較して、多い回数の前記第1の収集を行う、請求項1に記載の磁気共鳴イメージング装置。
- 前記生成部は、前記複数の第1のk空間データのうち1以上のk空間データを再構成の対象から除外して、前記磁気共鳴画像を生成する、請求項1に記載の磁気共鳴イメージング装置。
- 前記位相マップは、前記一つのk空間データより得られたデータと共役な画像と、前記第2のk空間データより得られた画像との積の位相に対応するデータである、請求項1に記載の磁気共鳴イメージング装置。
- 前記生成部は、前記第4のk空間データを逆フーリエ変換して前記磁気共鳴画像を生成する、請求項1に記載の磁気共鳴イメージング装置。
- 前記生成部は、前記第1のk空間データと前記位相マップとの積を取ることにより、前記第3のk空間データを生成する、請求項1に記載の磁気共鳴イメージング装置。
- 前記生成部は、前記複数の第1の収集における一の収集を、前記複数の第1の収集における他の収集が行われるk空間の領域の境界を含んで行う、請求項1に記載の磁気共鳴イメージング装置。
- 磁気共鳴イメージング装置による磁気共鳴イメージング方法であって、
シーケンス制御部により、複数のk空間領域に分けて複数の第1の収集を行って複数の第1のk空間データを収集し、前記複数の第1の収集それぞれに対応する複数の第2の収集を行って複数の第2のk空間データを収集し、
生成部により、前記複数の第2のk空間データのうち一つのk空間データと、前記複数の第2のk空間データとに基づいて、位相マップを生成し、前記複数の第1のk空間データと前記位相マップとに基づいて、複数の第3のk空間データを生成し、前記複数の第3のk空間データに対して平均処理を行って第4のk空間データを生成し、前記第4のk空間データに基づいて磁気共鳴画像を生成する、
磁気共鳴イメージング方法。
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US16/389,394 US10809341B1 (en) | 2019-04-19 | 2019-04-19 | Readout-segmented echo planar imaging with k-space averaging |
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