JP3668816B1 - 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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- G—PHYSICS
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- 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
- G01R33/5635—Angiography, e.g. contrast-enhanced angiography [CE-MRA] or time-of-flight angiography [TOF-MRA]
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- 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
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- 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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- 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
- G01R33/5613—Generating steady state signals, e.g. low flip angle sequences [FLASH]
- G01R33/5614—Generating steady state signals, e.g. low flip angle sequences [FLASH] using a fully balanced steady-state free precession [bSSFP] pulse sequence, e.g. trueFISP
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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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Abstract
【解決手段】磁気共鳴イメージング装置は、静磁場中に置かれた被検体に対して高周波磁場を発生する高周波磁場発生部8Tと、静磁場に重畳される傾斜磁場を発生する傾斜磁場発生部4と、被検体の体軸に略一致する軸を通る面に関するMRデータを被検体の心拍の特定期間内に収集するとともに、心拍ごとに面を体軸に略一致する軸を中心として回転するように、高周波磁場発生部及び傾斜磁場発生部を制御するシーケンサ5とを具備する。
【選択図】 図1
Description
図1に、本実施形態にかかる磁気共鳴イメージング装置の概略構成を示す。当該磁気共鳴イメージング装置は、円筒状の開口部(診断用空間)を有する磁石部1を有する。磁石部1は静磁場電源2から電流供給を受けて開口部内にZ軸方向に静磁場H0を発生する。典型的には、開口部に挿入された被検体Pの体軸はZ軸に略一致する。磁石部1にはシムコイル14が設けられる。シムコイル14はシムコイル電源15から電流供給を受けて静磁場均一化のための補正磁場を発生する。磁石部1の内側には傾斜磁場コイルユニット3が配置される。傾斜磁場コイルユニット3は、互いに直交するX、Y、Z各軸に沿って磁場強度を変化させるための傾斜磁場を発生するための3組のx,y,zコイル3x〜3zを備える。x,y,zコイル3x〜3zはそれぞれ個別に傾斜磁場電源4から電流供給を受けて、X、Y、Z各軸に対応する傾斜磁場を発生する。傾斜磁場電源4からx,y,zコイル3x〜3zに供給されるパルス電流を制御することにより、3軸X,Y,Z方向の傾斜磁場を任意に合成して、位相エンコード方向傾斜磁場Gpe、および周波数エンコード方向(リードアウト方向)傾斜磁場Groの各方向を任意に設定することができる。
Claims (8)
- 静磁場中に置かれた被検体に対して高周波磁場を発生する高周波磁場発生部と、
前記静磁場に重畳される傾斜磁場を発生する傾斜磁場発生部と、
k空間上での前記被検体の体軸に略一致する軸を通る面に関するMRデータを前記被検体の心拍の特定期間内に収集するとともに、前記心拍ごとに前記面を前記体軸に略一致する軸を中心として回転するように、前記高周波磁場発生部及び前記傾斜磁場発生部を制御する制御部とを具備することを特徴とする磁気共鳴イメージング装置。 - 前記MRデータに基づいて前記面ごとに画像を生成する画像生成部をさらに備えることを特徴とする請求項1記載の磁気共鳴イメージング装置。
- 前記画像生成部は、前記画像の位置を前記面ごとに補正する位置補正部を有することを特徴とする請求項2記載の磁気共鳴イメージング装置。
- 前記画像生成部は、前記位置補正された画像に基づいてフィルタ補正逆投影法によりボリュームデータを再構成する再構成部を有することを特徴とする請求項3記載の磁気共鳴イメージング装置。
- 前記画像生成部は、前記位置補正された画像をk空間のデータに戻してからフーリエ変換法によりボリュームデータを生成する生成部を有することを特徴とする請求項3記載の磁気共鳴イメージング装置。
- 前記画像生成部は、前記画像の基準画像に対する位置ずれを前記面ごとに決定する位置ずれ決定部を有することを特徴とする請求項3記載の磁気共鳴イメージング装置。
- 前記画像生成部は、前記MRデータを三次元k空間上にグリッディング法により再配置してフーリエ変換法によりボリュームデータを生成するとともに、前記ボリュームデータを前記画像各々の面に対応する方向で再投影することにより、前記画像にそれぞれ対応する前記基準画像を生成する基準画像生成部を有することを特徴とする請求項6記載の磁気共鳴イメージング装置。
- 前記位置補正部は、アフィン変換を含むことを特徴とする請求項3記載の磁気共鳴イメージング装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004364765A JP3668816B1 (ja) | 2004-12-16 | 2004-12-16 | 磁気共鳴イメージング装置 |
EP05727413A EP1825808B1 (en) | 2004-12-16 | 2005-03-30 | Magnetic resonance imaging system |
PCT/JP2005/006152 WO2006064582A1 (ja) | 2004-12-16 | 2005-03-30 | 磁気共鳴イメージング装置 |
US11/712,911 US7256578B2 (en) | 2004-12-16 | 2007-03-02 | Magnetic resonance imaging system |
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JP2004364765A JP3668816B1 (ja) | 2004-12-16 | 2004-12-16 | 磁気共鳴イメージング装置 |
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JP3668816B1 true JP3668816B1 (ja) | 2005-07-06 |
JP2006167208A JP2006167208A (ja) | 2006-06-29 |
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US (1) | US7256578B2 (ja) |
EP (1) | EP1825808B1 (ja) |
JP (1) | JP3668816B1 (ja) |
WO (1) | WO2006064582A1 (ja) |
Cited By (1)
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JP2008023338A (ja) * | 2006-07-21 | 2008-02-07 | Siemens Ag | 動的な磁気共鳴撮像方法ならびに磁気共鳴装置 |
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CN100570393C (zh) * | 2006-02-06 | 2009-12-16 | 株式会社东芝 | 磁共振成像装置及磁共振成像方法 |
JP5074051B2 (ja) * | 2007-02-13 | 2012-11-14 | 株式会社日立メディコ | 磁気共鳴イメージング装置 |
US8219176B2 (en) * | 2007-03-08 | 2012-07-10 | Allegheny-Singer Research Institute | Single coil parallel imaging |
JP5329818B2 (ja) * | 2007-03-26 | 2013-10-30 | 株式会社東芝 | 磁気共鳴イメージング装置および磁気共鳴イメージング装置における撮影条件設定方法 |
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US7541808B2 (en) * | 2007-04-11 | 2009-06-02 | Allegheny-Singer Research Institute | Rapid MRI dynamic imaging using MACH |
CN101366952A (zh) * | 2007-08-13 | 2009-02-18 | 鸿富锦精密工业(深圳)有限公司 | 磁共振成像对比剂 |
JP5854575B2 (ja) * | 2007-12-10 | 2016-02-09 | 株式会社東芝 | 磁気共鳴イメージング装置 |
JP5361236B2 (ja) | 2008-03-31 | 2013-12-04 | 株式会社東芝 | 磁気共鳴イメージング装置および撮像条件設定方法 |
US8688193B2 (en) * | 2008-06-26 | 2014-04-01 | Allegheny-Singer Research Institute | Magnetic resonance imager, method and program which continuously applies steady-state free precession to k-space |
US8131046B2 (en) * | 2008-10-29 | 2012-03-06 | Allegheny-Singer Research Institute | Magnetic resonance imager using cylindrical offset region of excitation, and method |
US8577442B2 (en) * | 2009-03-24 | 2013-11-05 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
US9176212B2 (en) * | 2009-04-16 | 2015-11-03 | Ghost Medical Technologies, Ltd | Method for non-contrast enhanced magnetic resonance angiography |
US9211081B2 (en) | 2009-04-16 | 2015-12-15 | Ghost Medical Technologies, Ltd | Method for non-contrast enhanced magnetic resonance angiography |
US8198892B2 (en) * | 2009-04-22 | 2012-06-12 | Allegheny-Singer Research Institute | Steady-state-free-precession (SSFP) magnetic resonance imaging (MRI) and method |
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JP5023127B2 (ja) * | 2009-09-30 | 2012-09-12 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 磁気共鳴イメージング装置 |
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US20110215805A1 (en) * | 2010-03-03 | 2011-09-08 | Allegheny-Singer Research Institute | MRI and method using multi-slice imaging |
US9507003B2 (en) | 2012-09-19 | 2016-11-29 | Northshore University Healthsystem | System and method for imaging of vascular structures using non-contrast enhanced magnetic resonance imaging |
JP5686836B2 (ja) * | 2013-03-11 | 2015-03-18 | 株式会社東芝 | 磁気共鳴イメージング装置 |
DE102013205832A1 (de) | 2013-04-03 | 2014-10-23 | Friedrich-Alexander-Universität Erlangen-Nürnberg | Verfahren zur Erzeugung von Bilddaten |
DE102013205830B4 (de) * | 2013-04-03 | 2024-05-29 | Siemens Healthineers Ag | Verfahren und Bilddatenerzeugungseinrichtung zur Erzeugung von Bilddaten eines sich bewegenden Objekts, Magnetresonanzanlage und Computerprogrammprodukt |
US9241654B2 (en) | 2013-06-20 | 2016-01-26 | Northshore University Healthsystem | System and method for selective magnetic resonance imaging angiography of arteries or veins |
KR20160103008A (ko) | 2013-12-03 | 2016-08-31 | 뷰레이 테크놀로지스 인크. | 위상 상관을 이용한 비-강성 변형의 존재시에 의료 영상들의 단일- 및 다중-모달리티 정렬 |
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DE102004023849B4 (de) * | 2004-05-13 | 2013-09-26 | Siemens Aktiengesellschaft | Medizinische Untersuchungseinrichtung zur Aufnahme von Schichtbildern eines Untersuchungsobjekts, insbesondere Magnetresonanzeinrichtung |
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JP2008023338A (ja) * | 2006-07-21 | 2008-02-07 | Siemens Ag | 動的な磁気共鳴撮像方法ならびに磁気共鳴装置 |
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WO2006064582A1 (ja) | 2006-06-22 |
US20070159174A1 (en) | 2007-07-12 |
JP2006167208A (ja) | 2006-06-29 |
EP1825808A4 (en) | 2009-11-11 |
US7256578B2 (en) | 2007-08-14 |
EP1825808B1 (en) | 2012-09-19 |
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