JP3817224B2 - アンダーサンプリングされた3d投影イメージング法を用いる磁気共鳴血管造影システム - Google Patents
アンダーサンプリングされた3d投影イメージング法を用いる磁気共鳴血管造影システム Download PDFInfo
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- JP3817224B2 JP3817224B2 JP2002559698A JP2002559698A JP3817224B2 JP 3817224 B2 JP3817224 B2 JP 3817224B2 JP 2002559698 A JP2002559698 A JP 2002559698A JP 2002559698 A JP2002559698 A JP 2002559698A JP 3817224 B2 JP3817224 B2 JP 3817224B2
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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
- G01R33/4818—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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- 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
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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
- G01R33/563—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
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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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/281—Means for the use of in vitro contrast agents
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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
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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
- G01R33/5611—Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE
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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
- G01R33/5619—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 by temporal sharing of data, e.g. keyhole, block regional interpolation scheme for k-Space [BRISK]
Description
(1)そこから用量タイミングスキャンが定められる2Dローカライザー(localizer)、
(2)2D用量タイミングスキャン、
(3)3D投影マスク取得、及び
(4)3D投影コントラスト増幅取得
である。
Claims (6)
- k空間の中央から実質的に半径方向に伸びる軌道に沿って該k空間をサンプリングするため、選定された脈管系における複数のスピンにより生成されたNMR信号を取得する三次元投影再構成パルスシーケンスを果たすべく前記MRIシステムを操作するパルス発生器と、
複数の軌道間に実質的に一様な間隔を有し、且つ、前記サンプリングされるk空間体積の周縁における隣接した軌道から取得されるk空間サンプル間の間隔が、実質的にNyquist条件を満たすのに必要な間隔の2倍より大きな状態で、三次元k空間体積全体にわたってk空間をサンプリングして画像データセットを取得するため、前記三次元投影再構成パルスシーケンスにおいて、異なる読み取り勾配を用いて、前記パルスシーケンスを繰り返すよう前記パルス発生器に指示する手段と、
連続して取得される画像データセットをk空間における3つの異なるインターリーブされた位置からサンプリングして前記パルス発生器に付加的な画像データセットを取得するよう指示する手段と、
該取得された3つの連続的な画像データセットのうち二番目のデータセットからの全てのk空間サンプルを、該3つの連続的な画像データセットのうちの一番目及び三番目からの周縁領域k空間サンプルと結合し、該結合されたk空間サンプルを用いて画像を再構成する手段と、を備える磁気共鳴撮像(MRI)システム。 - 各画像データセットの中央領域における前記k空間サンプル間の間隔が、Nyquist条件を満足する請求項1に記載のMRIシステム。
- 前記サンプリングする軌道が、そこから実質的に反対方向にk空間の中央から伸び、また前記サンプリングされるk空間体積の外側境界上の実質的に反対側の点へ伸びる、請求項1に記載のMRIシステム。
- k空間の中央から実質的に半径方向に伸びる軌道に沿って三次元k空間体積中をサンプリングするため、患者の選定された脈管系における複数のスピンにより生成されたNMR信号を取得する、第1の速度コード化勾配を有する前記三次元投影再構成パルスシーケンスを果たすべくMRIシステムを操作する手段と、
軌道間に実質的に一様な間隔を有し、且つ、前記サンプリングされるk空間体積の周縁における隣接した軌道から取得されるk空間サンプル間の間隔が、実質的にNyquist条件を満たすのに必要な間隔の2倍より大きな状態で、前記三次元k空間体積全体にわたってk空間をサンプリングすべく異なる読み取り勾配を用いて前記パルスシーケンスを繰り返すことによって第1の画像データセットを生成する手段と、
前記第1の画像データセットをサンプリングするのに用いられる前記軌道に対してインターリーブされる軌道に沿って前記三次元k空間体積をサンプリングすべく、前記第1の速度コード化勾配と異なる第2の速度コード化勾配を有する三次元投影再構成パルスシーケンスを用いて前記パルスシーケンスを繰り返すことによって第2の画像データセットを生成する手段と、
前記第1及び第2の画像データセットからのk空間サンプルを結合する手段と、
該結合されたk空間サンプルから画像を再構成する手段と、を備える磁気共鳴撮像(MRI)システム。 - 前記第1及び第2の画像データセットをサンプリングするのに用いられる前記軌道に対してインターリーブされる軌道に沿って前記三次元k空間体積をサンプリングすべく、前記第1及び第2の速度コード化勾配と異なる第3の速度コード化勾配を有する三次元投影再構成パルスシーケンスを用いて前記パルスシーケンスを繰り返すことによって第3の画像データセットを生成する手段と、
3つの画像データセット全てからのk空間サンプルを結合する手段と、を備える請求項4に記載のMRIシステム。 - 前記3つの速度コード化勾配が3つのそれぞれ直交する軸に沿ったスピン運度に対してコード化する請求項5記載のMRIシステム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/767,757 US6487435B2 (en) | 1998-04-10 | 2001-01-23 | Magnetic resonance angiography using undersampled 3D projection imaging |
PCT/US2002/000564 WO2002059633A1 (en) | 2001-01-23 | 2002-01-09 | Magnetic resonance angiography using undersampled 3d projection imaging |
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JP2004524079A JP2004524079A (ja) | 2004-08-12 |
JP3817224B2 true JP3817224B2 (ja) | 2006-09-06 |
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JP2002559698A Expired - Lifetime JP3817224B2 (ja) | 2001-01-23 | 2002-01-09 | アンダーサンプリングされた3d投影イメージング法を用いる磁気共鳴血管造影システム |
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US (1) | US6487435B2 (ja) |
EP (1) | EP1354215B1 (ja) |
JP (1) | JP3817224B2 (ja) |
WO (1) | WO2002059633A1 (ja) |
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NL8703127A (nl) * | 1987-12-24 | 1989-07-17 | Philips Nv | Werkwijze en inrichting voor het genereren van vervlochten multiple-slice en multiple-echo pulssequenties voor mri. |
US5243284A (en) * | 1991-07-24 | 1993-09-07 | Board Of Trustees Of The Leland Stanford Junior University | Method of magnetic resonance reconstruction imaging from projections using partial data collected in k-space |
DE4319539A1 (de) * | 1993-06-12 | 1994-12-15 | Philips Patentverwaltung | Verfahren zur Erzeugung einer MR-Bildfolge und Anordnung zur Durchführung des Verfahrens |
US5485086A (en) * | 1994-07-26 | 1996-01-16 | The Board Of Trustees Of The Leland Stanford Junior University | Continuous fluoroscopic MRI using spiral k-space scanning |
EP0769151A1 (en) * | 1995-05-02 | 1997-04-23 | Koninklijke Philips Electronics N.V. | Method of and device for magnetic resonance imaging of objects |
US6230040B1 (en) * | 1997-11-21 | 2001-05-08 | Cornell Research Foundation, Inc. | Method for performing magnetic resonance angiography with dynamic k-space sampling |
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