JP5709950B2 - プロペラmri用磁気共鳴装置及び方法 - Google Patents
プロペラmri用磁気共鳴装置及び方法 Download PDFInfo
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- 238000002595 magnetic resonance imaging Methods 0.000 description 21
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- 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
- G01R33/4824—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 using a non-Cartesian trajectory
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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]
- 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
- G01R33/4824—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 using a non-Cartesian trajectory
- G01R33/4826—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 using a non-Cartesian trajectory in three dimensions
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- G01R33/48—NMR imaging systems
- G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
- G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
- G01R33/4835—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices of multiple slices
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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
- 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
- G01R33/561—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
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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
- G01R33/561—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]
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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
- G01R33/561—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]
- G01R33/5617—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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- 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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- 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
- G01R33/567—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution gated by physiological signals, i.e. synchronization of acquired MR data with periodical motion of an object of interest, e.g. monitoring or triggering system for cardiac or respiratory gating
- G01R33/5676—Gating or triggering based on an MR signal, e.g. involving one or more navigator echoes for motion monitoring and correction
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Description
a)身体の少なくとも一部を、少なくとも1つのRFパルス及び切替え磁場傾斜のMR撮像シーケンスに曝すことによって、一連のMR信号を生成し、
b)PROPELLER法に従って、k空間の中心の周りで回転された複数のk空間ブレードを収集し、MR信号収集中に、k空間ブレードの回転角は、収集されるk空間ブレードの総数をNとして、180°/Nより大きい角度ずつ増大され、且つ
c)収集されたMR信号からMR画像を再構成する、
ように構成することを提案する。
a)身体の少なくとも一部を、少なくとも1つのRFパルス及び切替え磁場傾斜のMR撮像シーケンスに曝すことによって、一連のMR信号を生成し、
b)k空間の中央部分からMR基準データセットを収集し、
c)PROPELLER法に従って、k空間の中心の周りで回転された複数のk空間ブレードを収集し、k空間の中央部分の少なくとも一部が各k空間ブレードで収集され、
d)段階c)にて収集されたMRデータを、k空間ブレードごとに、k空間の中央部分のMR基準データセットと比較し、動き誘起の変位及び位相誤差の見積もり及び補正を行い、且つ
e)収集され且つ補正されたMR信号からMR画像を再構成する、
ように構成することを提案する。
a)身体の少なくとも一部を、少なくとも1つのRFパルス及び切替え磁場傾斜のMR撮像シーケンスに曝すことによって、一連のMR信号を生成し、
b)PROPELLER法に従って、k空間の中心の周りで回転された複数のk空間ブレードを収集し、
c)収集されたMRデータを重み付け、このとき、重み係数は、コントラスト操作に関する収集時間、動き補償に関する相関量、及び複数のk空間ブレードの重なり領域の幾何学配置に基づいて直接的に計算され、且つ
d)収集され且つ重み付けられたMR信号からMR画像を再構成する、
ように構成することを提案する。
w0(b,l,s)=wD(l,s)wC(b)
を用いて初期化される。ただし、wDは、通常はbに依存しないコントラスト加重に関する収集時間から得られた重みを表す。wCは、通常はbのみに依存する(面間)動き補正に関する相関量から得られた重みを表す。次の段階として、これらの重みが
Claims (4)
- 検査ボリューム内に配置された身体のMR撮像用の装置であって、
前記検査ボリューム内に実質的に均一な主磁場を構築する手段、
前記主磁場に重ね合わされる切替え磁場傾斜を生成する手段、
前記身体に向けてRFパルスを放射する手段、
前記磁場傾斜及び前記RFパルスの生成を制御する制御手段、
MR信号の受信及びサンプリングを行う手段、及び
前記信号のサンプルからMR画像を形成する再構成手段、
を有し、
a)前記身体の少なくとも一部を、少なくとも1つのRFパルス及び切替え磁場傾斜のMR撮像シーケンスに曝すことによって、一連のMR信号を生成し、
b)k空間の中央部分から3次元MR基準データセットを収集し、
c)PROPELLER法に従って、k空間の中心の周りで回転された複数のk空間ブレードを収集し、k空間の前記中央部分の少なくとも一部が各k空間ブレードで収集され、
d)段階c)にて収集されたMRデータを、k空間ブレードごとに、k空間の前記中央部分の前記MR基準データセットと比較し、動き誘起の変位及び位相誤差の見積もり及び補正を行い、且つ
e)収集され且つ補正されたMR信号からMR画像を再構成する、
ように構成された装置。 - 段階c)にて、前記k空間ブレードは、前記k空間ブレードの回転面に垂直な方向に隔てられた2つ以上の平行画像スライスで収集される、請求項1に記載の装置。
- MR装置の検査ボリューム内に配置された身体の少なくとも一部のMR撮像方法であって:
a)前記身体の少なくとも一部を、少なくとも1つのRFパルス及び切替え磁場傾斜のMR撮像シーケンスに曝すことによって、一連のMR信号を生成する段階、
b)k空間の中央部分から3次元MR基準データセットを収集する段階、
c)2つ以上の平行画像スライスからPROPELLER法に従って、k空間の中心の周りで回転された複数のk空間ブレードを収集する段階であり、k空間の前記中央部分の少なくとも一部が各k空間ブレードで収集される段階、
d)段階c)にて収集されたMRデータを、k空間ブレードごとに、k空間の前記中央部分の前記MR基準データセットと比較し、動き誘起の変位及び位相誤差の見積もり及び補正を行う段階、及び
e)収集され且つ補正されたMR信号からMR画像を再構成する段階、
を有するMR撮像方法。 - MR装置用のコンピュータプログラムであって、
a)少なくとも1つのRFパルス及び切替え磁場傾斜のMR撮像シーケンスを生成し、
b)k空間の中央部分から3次元MR基準データセットを収集し、
c)2つ以上の平行画像スライスからPROPELLER法に従って、k空間の中心の周りで回転された複数のk空間ブレードを収集し、k空間の前記中央部分の少なくとも一部が各k空間ブレードで収集され、
d)段階c)にて収集されたMRデータを、k空間ブレードごとに、k空間の前記中央部分の前記MR基準データセットと比較し、動き誘起の変位及び位相誤差の見積もり及び補正を行い、且つ
e)収集され且つ補正されたMR信号からMR画像を再構成する、
ための命令群を有するコンピュータプログラム。
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JP2014210209A (ja) * | 2007-04-27 | 2014-11-13 | コーニンクレッカ フィリップス エヌ ヴェ | プロペラmri用磁気共鳴装置及び方法 |
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