JP6670902B2 - 磁気共鳴イメージングと放射線照射とを組み合わせた医療用イメージング装置およびシムユニットの装着を決定する方法 - Google Patents
磁気共鳴イメージングと放射線照射とを組み合わせた医療用イメージング装置およびシムユニットの装着を決定する方法 Download PDFInfo
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- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/387—Compensation of inhomogeneities
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- A61B6/5247—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image combining images from an ionising-radiation diagnostic technique and a non-ionising radiation diagnostic technique, e.g. X-ray and ultrasound
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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
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/246—Spatial mapping of the RF magnetic field B1
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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
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
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- G—PHYSICS
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- 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
- G01R33/4808—Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]
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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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- G01R33/00—Arrangements or instruments for measuring magnetic variables
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- 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
- G01R33/5659—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the RF magnetic field, e.g. spatial inhomogeneities of the RF magnetic field
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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
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/387—Compensation of inhomogeneities
- G01R33/3875—Compensation of inhomogeneities using correction coil assemblies, e.g. active shimming
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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
- G01R33/4808—Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]
- G01R33/4812—MR combined with X-ray or computed tomography [CT]
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Description
・特に患者用開口内の磁気共鳴イメージングユニットの磁場分布を回転角に関係して測定し、それから磁気ひずみを決定するステップと、
・磁気ひずみの回転角に無関係な第1成分と、回転角に関係する第2成分を決定するステップと、
・磁気ひずみの第1成分を補償するため静止型シムユニットにおけるシム要素の配置を決定するステップと、
・磁気ひずみの第2成分を補償するため回転可能型シムユニットにおけるシム要素の配置を決定するステップと、
によりシムユニットにシム要素を装着する決定方法を含む、特にシムユニット内のシム要素の数、大きさおよび位置を決定もしくは算出すれば、その装着を簡単に実施することができる。
ΔB(x´,y´,z´,Θ)=ΔB1(x´,y´,z´)+ΔB2(x´,y´,z´,Θ)
により算出される。ここでB1は磁気ひずみの回転角に無関係な第1成分、B2は回転角に関係する第2成分である。x´,y´,z´は非回転型基準系、すなわちイメージングシステムの静止型部分における位置座標である。
20 主磁石
21 回転可能型受動シムユニット
31 静止型受動シムユニット
40 患者用開口
51 磁気要素
60 X線源
61 X線検出器
70 患者
71 患者用寝台
211 第1のストラップ付き引き出し
212 第2のストラップ付き引き出し
311 第1のストラップ付き引き出し
312 第2のストラップ付き引き出し
Claims (9)
- 磁気共鳴イメージングと検査対象物への放射線照射とを組み合わせた医療用イメージングシステムであって、
磁気共鳴イメージングユニットと放射線照射ユニットとを備え、前記放射線照射ユニットが前記磁気共鳴イメージングユニットと構造的に一体化されるように両者が機械的に接続されるとともに検査対象物を横臥させるための患者用開口を取り囲むようにし、前記磁気共鳴イメージングユニットが磁場発生用に少なくとも1つの主磁石を有し、前記放射線照射ユニットが放射線を発生するための放射線源を有し、
前記医療用イメージングシステムが静止型部分と或る回転角だけ回転可能な回転可能型部分とから形成され、少なくとも1つの主磁石が静止型放射線照射ユニットを中心に回転可能に配置されるか、または回転可能型放射線照射ユニットが少なくとも1つの静止型主磁石を中心に回転可能に配置され、
少なくとも2つの受動シムユニットを有し、そのうち少なくとも1つの静止型シムユニットが固定され、少なくとも1つの回転可能型シムユニットが前記回転可能型部分と接続され、
前記少なくとも1つの静止型シムユニットが、磁気ひずみの回転角とは無関係な第1の成分を少なくとも部分的に補償するように形成され、
前記少なくとも1つの回転可能型シムユニットが、磁気ひずみの回転角と関係する第2の成分を少なくとも部分的に補償するように形成された、
医療用イメージングシステム。 - 前記少なくとも2つの受動シムユニットがそれぞれ複数のシム要素を有し、
前記複数のシム要素が磁気ひずみを少なくとも部分的に補償するようにシムユニットに配置される請求項1記載の医療用イメージング装置。 - 補償すべき磁気ひずみが少なくとも2等級以上である請求項2記載の医療用イメージング装置。
- 前記放射線照射ユニットがX線イメージングユニットから形成され、
前記X線イメージングユニットがX線を発生するためのX線源を有する請求項1から3のいずれか1項に記載の医療用イメージング装置。 - 前記X線イメージングユニットがさらに放射線を画像データに変換するためのX線検出器を有する請求項4記載の医療用イメージング装置。
- 複数のコイルを備えた少なくとも1つの能動シムユニットを付加的に有し、
前記複数のコイルがその貫流電流に関して制御可能に形成される請求項1から5のいずれか1項に記載の医療用イメージング装置。 - 請求項1から6のいずれか1項に記載の医療用イメージング装置において、
・磁気共鳴イメージングユニットの磁場分布を回転角に関係して測定し、それから磁気ひずみを決定するステップと、
・磁気ひずみの回転角に無関係な第1成分と、回転角に関係する第2成分を決定するステップと、
・第1成分を補償するため静止型シムユニットにおけるシム要素の配置を決定するステップと、
・第2成分を補償するため回転可能型シムユニットにおけるシム要素の配置を決定するステップと、
によりシムユニットにシム要素の装着を決定する方法。 - 前記シムユニットにおける、前記シム要素の数、大きさおよび位置を決定する請求項7記載の方法。
- 前記決定された配置に従って、前記シム要素を前記シムユニットに装着する請求項7または8記載の方法。
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EP17193198.3 | 2017-09-26 | ||
EP17193198.3A EP3460500A1 (de) | 2017-09-26 | 2017-09-26 | Medizinisches bildgebungsgerät zur kombinierten magnetresonanzbildgebung und bestrahlung und verfahren zur bestimmung der bestückung von shim-einheiten |
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JP5719844B2 (ja) | 2009-07-15 | 2015-05-20 | ヴューレイ インコーポレイテッド | 線形加速器及び磁気共鳴撮像装置を互いに遮蔽する方法及び装置 |
US9446263B2 (en) | 2013-03-15 | 2016-09-20 | Viewray Technologies, Inc. | Systems and methods for linear accelerator radiotherapy with magnetic resonance imaging |
KR20180120705A (ko) | 2016-03-02 | 2018-11-06 | 뷰레이 테크놀로지스 인크. | 자기 공명 영상을 이용한 입자 치료 |
JP7127126B2 (ja) | 2017-12-06 | 2022-08-29 | ビューレイ・テクノロジーズ・インコーポレイテッド | 放射線治療のシステム、方法およびソフトウェア |
EP3739352A1 (de) | 2019-05-16 | 2020-11-18 | Siemens Healthcare GmbH | Magnetresonanzanlage und verfahren zum ausgleich von grundmagnetfeldinhomogenitäten erster ordnung in einem untersuchungsbereich der magnetresonanzanlage |
US11029377B2 (en) * | 2019-09-03 | 2021-06-08 | Synaptive Medical Inc. | Method and system for reducing magnetic field instabilities in a magnetic resonance system |
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GB2439749B (en) * | 2006-07-06 | 2010-03-03 | Siemens Magnet Technology Ltd | Passive shimming of magnet systems |
JP4872952B2 (ja) | 2008-03-06 | 2012-02-08 | 日本電気株式会社 | Tcpバッファコピー分散並列処理装置、方法及びプログラム |
JP5719844B2 (ja) * | 2009-07-15 | 2015-05-20 | ヴューレイ インコーポレイテッド | 線形加速器及び磁気共鳴撮像装置を互いに遮蔽する方法及び装置 |
WO2012077064A1 (en) * | 2010-12-08 | 2012-06-14 | Koninklijke Philips Electronics N.V. | Slip ring assembly |
WO2012122462A2 (en) * | 2011-03-09 | 2012-09-13 | Thimbletech, Inc. | Use of magnetic resonance techniques for molecular detection |
CN103562740B (zh) * | 2011-05-31 | 2016-11-16 | 皇家飞利浦有限公司 | Mri放射治疗装置的静态磁场的校正 |
US8981779B2 (en) | 2011-12-13 | 2015-03-17 | Viewray Incorporated | Active resistive shimming fro MRI devices |
JP5806175B2 (ja) * | 2012-07-06 | 2015-11-10 | 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 | ラベリング領域決定装置および磁気共鳴装置並びにプログラム |
KR20150058372A (ko) * | 2012-09-21 | 2015-05-28 | 지멘스 악티엔게젤샤프트 | Mr 스캐너, 엑스-레이 공급원 및 엑스-레이 검출기를 가지는 하이브리드 검사 시스템 |
WO2014121991A1 (en) * | 2013-02-06 | 2014-08-14 | Koninklijke Philips N.V. | Active compensation for field distorting components in a magnetic resonance imaging system with a gantry |
US10661098B2 (en) * | 2013-06-21 | 2020-05-26 | Koninklijke Philips N.V. | Shim system for a magnetic resonance hybrid scanner |
DE102015204953B3 (de) * | 2015-03-19 | 2016-08-11 | Siemens Healthcare Gmbh | Verfahren zur Magnetresonanz-Bildgebung |
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