JP5288745B2 - 磁気共鳴イメージング装置 - Google Patents
磁気共鳴イメージング装置 Download PDFInfo
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- JP5288745B2 JP5288745B2 JP2007209520A JP2007209520A JP5288745B2 JP 5288745 B2 JP5288745 B2 JP 5288745B2 JP 2007209520 A JP2007209520 A JP 2007209520A JP 2007209520 A JP2007209520 A JP 2007209520A JP 5288745 B2 JP5288745 B2 JP 5288745B2
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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
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- 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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- 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
- G01R33/5673—Gating or triggering based on a physiological signal other than an MR signal, e.g. ECG gating or motion monitoring using optical systems for monitoring the motion of a fiducial marker
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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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- 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
- A61B5/7271—Specific aspects of physiological measurement analysis
- A61B5/7285—Specific aspects of physiological measurement analysis for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal
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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
- G01R33/5602—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by filtering or weighting based on different relaxation times within the sample, e.g. T1 weighting using an inversion pulse
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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
- G01R33/5607—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reducing the NMR signal of a particular spin species, e.g. of a chemical species for fat suppression, or of a moving spin species for black-blood imaging
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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
- G01R33/565—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
Description
なお、被検体200の呼吸周期に応じて収集期間を変化させる場合には、上記式(1)におけるPAも変化させる。このとき、被検体200の呼吸周期は頻繁に変動するので、収集期間は呼吸周期に応じて変化させることになる。ただし、1周期毎に収集期間を変化させると動作が不安定になる恐れがあるので、複数周期における呼吸周期の平均値、中央値、最大値または最小値などに基づいて収集期間を定めることが好ましい。上記式(1)におけるPAも、上記のように定めた収集期間に応じた値を採用する。繰り返し周期またはエンコード方向のマトリクス数が可変である場合には、それに応じた値を上記式(1)におけるTRまたはPEとして採用する。
Claims (7)
- 所定のパルスシーケンスにより被検体に関する磁気共鳴データを収集する収集ユニットと、
前記収集ユニットにより収集された磁気共鳴データに基づきパラレルイメージングによって前記被検体に関する前記撮像視野内の画像を再構成するユニットと、
前記パラレルイメージングの倍速率をユーザによる指定に応じて設定する設定ユニットと、
前記被検体の1回の吸気または呼気が開始したタイミングから予め定めた遅延時間が経過した時点から開始し、かつ前記1回の吸気または呼気の期間内に終了する収集期間内に得られるスライス数を、前記設定手段により設定された倍速率と前記被検体の呼吸周期とに基づいて計算する計算ユニットと、
前記計算ユニットにより計算されたスライス数分の前記磁気共鳴データを前記収集期間内に収集するように前記収集ユニットを制御する制御ユニットとを具備したことを特徴とする磁気共鳴イメージング装置。 - 前記収集ユニットは、所望撮像視野に応じて定まる位相エンコードステップの一部を間引きつつ複数のコイルを同時に使用して前記磁気共鳴データを収集することを特徴とする請求項1に記載の磁気共鳴イメージング装置。
- 前記収集ユニットは、前記パルスシーケンスとしてFFE(fast field echo)シーケンスを採用することを特徴とする請求項1に記載の磁気共鳴イメージング装置。
- 前記収集ユニットは、前記パルスシーケンスとして、フリップパルスにbinomial RF pulseを使用することにより水のプロトンを主に励起する水励起法を含んだシーケンスを採用することを特徴とする請求項1に記載の磁気共鳴イメージング装置。
- 前記収集ユニットは、前記パルスシーケンスによる前記磁気共鳴データの収集に先立ってIR(inversion recovery)パルスを送信することを特徴とする請求項1に記載の磁気共鳴イメージング装置。
- 前記収集ユニットは、前記IRパルスのフリップアングルと前記IRパルスを送信してからk空間中心に配置される磁気共鳴データが収集されるまでの時間とを、血流からの信号を抑制するように設定することを特徴とする請求項5に記載の磁気共鳴イメージング装置。
- 前記計算ユニットにより計算されたスライス数を表示する表示ユニットをさらに備えたことを特徴とする請求項1に記載の磁気共鳴イメージング装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2007209520A JP5288745B2 (ja) | 2006-09-13 | 2007-08-10 | 磁気共鳴イメージング装置 |
US11/898,255 US20080064951A1 (en) | 2006-09-13 | 2007-09-11 | Magnetic resonance imaging system |
Applications Claiming Priority (3)
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JP2006248423 | 2006-09-13 | ||
JP2006248423 | 2006-09-13 | ||
JP2007209520A JP5288745B2 (ja) | 2006-09-13 | 2007-08-10 | 磁気共鳴イメージング装置 |
Publications (2)
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JP2008093414A JP2008093414A (ja) | 2008-04-24 |
JP5288745B2 true JP5288745B2 (ja) | 2013-09-11 |
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JP2007209520A Active JP5288745B2 (ja) | 2006-09-13 | 2007-08-10 | 磁気共鳴イメージング装置 |
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US (1) | US20080064951A1 (ja) |
JP (1) | JP5288745B2 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010058732A1 (ja) * | 2008-11-18 | 2010-05-27 | 株式会社 日立メディコ | 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 |
JP5624346B2 (ja) * | 2009-04-03 | 2014-11-12 | 株式会社東芝 | 磁気共鳴イメージング装置 |
DE102009055960B4 (de) * | 2009-11-27 | 2021-01-14 | Siemens Healthcare Gmbh | Verfahren zur Akquisition von Messdaten eines atmenden Untersuchungsobjekts mittels Magnetresonanztechnik und zugehöriges Computerprogramm |
EP2577338A1 (en) * | 2010-05-27 | 2013-04-10 | Koninklijke Philips Electronics N.V. | Magnetic resonance examination with instrument detection |
JP6045793B2 (ja) * | 2012-01-13 | 2016-12-14 | 東芝メディカルシステムズ株式会社 | 磁気共鳴撮像装置 |
JP6440980B2 (ja) * | 2013-07-10 | 2018-12-19 | キヤノンメディカルシステムズ株式会社 | 磁気共鳴イメージング装置 |
US9702954B2 (en) * | 2014-03-31 | 2017-07-11 | Toshiba Medical Systems Corporation | Pseudo-continuous asymmetric signal targeting alternating radio frequency (pASTAR) for magnetic resonance angiography |
US10520570B2 (en) | 2014-05-09 | 2019-12-31 | Beth Israel Deaconess Medical Center, Inc. | System and method for tissue characterization using multislice magnetic resonance imaging |
CN107122617A (zh) * | 2017-05-16 | 2017-09-01 | 上海联影医疗科技有限公司 | 医学成像数据的获取方法及医学成像设备 |
Family Cites Families (9)
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US4712560A (en) * | 1985-08-09 | 1987-12-15 | General Electric Company | Apparatus and method of acquiring physiological gating signals for magnetic resonance imaging of moving objects |
US5377679A (en) * | 1988-10-27 | 1995-01-03 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging system |
JPH0549621A (ja) * | 1991-08-23 | 1993-03-02 | Hitachi Ltd | 呼吸動補正型磁気共鳴検査装置 |
US5273040A (en) * | 1991-11-14 | 1993-12-28 | Picker International, Inc. | Measurement of vetricle volumes with cardiac MRI |
JP4040742B2 (ja) * | 1997-03-28 | 2008-01-30 | 株式会社東芝 | Mri装置 |
JP4082779B2 (ja) * | 1998-04-17 | 2008-04-30 | 株式会社東芝 | Mri装置 |
US6782286B2 (en) * | 1998-04-20 | 2004-08-24 | Kabushiki Kaisha Toshiba | MRI system and MR imaging method |
DE10117787A1 (de) * | 2001-04-10 | 2002-10-17 | Philips Corp Intellectual Pty | MR-Verfahren zur Untersuchung eines zyklisch veränderlichen Objekts |
JP3995542B2 (ja) * | 2002-06-28 | 2007-10-24 | 東芝医用システムエンジニアリング株式会社 | 磁気共鳴イメージング装置及び磁気共鳴イメージングのデータ収集方法 |
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2007
- 2007-08-10 JP JP2007209520A patent/JP5288745B2/ja active Active
- 2007-09-11 US US11/898,255 patent/US20080064951A1/en not_active Abandoned
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JP2008093414A (ja) | 2008-04-24 |
US20080064951A1 (en) | 2008-03-13 |
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