公开(公告)号：EP2561375A4

公开(公告)日：2016-07-27

申请号：EP11758880

申请日：2011-03-24

申请人： ELEKTA AB

发明人： SIMOLA JUHA ,  TAULU SAMU

IPC分类号： G01R33/025 ,  A61B5/00 ,  A61B5/04 ,  A61B5/055 ,  G01R33/381 ,  G01R33/385 ,  G01R33/3875 ,  G01R33/48

CPC分类号： G06F17/12 ,  A61B5/0035 ,  A61B5/04008 ,  A61B5/055 ,  G01R33/025 ,  G01R33/28 ,  G01R33/381 ,  G01R33/385 ,  G01R33/3875 ,  G01R33/4215 ,  G01R33/4808

摘要： The present invention introduces a method, apparatus and computer program for magnetic resonance imaging or magnetoencephalography applications in order to control currents of a coil assembly (20), and thus achieving desired magnetic fields precisely in the measuring volume (21). The approach is an algebraic method where a field vector is generated for the test currents of each coil (20). Vector and matrix algebra is applied and a linear set of equations is formed. Field components and their derivatives up to the desired order can be taken into account. Principal component analysis or independent component analysis can be applied for determination of the dominant external interference components. By checking the condition value for the matrix (33, 45), it is possible to investigate whether a reasonable solution of currents for desired magnetic fields is possible to achieve. Finally, solved currents can be installed into a current supply unit (29) feeding the coils of the assembly (20). The invention can be applied as an active compensation feature for different interference shapes in the MEG application (25), or for the precise creation of the fields and gradients in the MRI application (24).

公开(公告)号：EP2353170B1

公开(公告)日：2013-11-20

申请号：EP09744719.7

申请日：2009-10-30

申请人： Emscan Limited

发明人： McGINLEY, John, Vincent, Mario ,  YOUNG, Ian, Robert

IPC分类号： H01F7/06 ,  G01R33/381

CPC分类号： G01R33/381 ,  H01F6/00

摘要： An electromagnet assembly comprises a first pair of substantially co-planar coils wound in opposite senses to each other. It further comprises a second pair of co-planar coils also wound in opposite senses to each other. The coil pairs are arranged substantially parallel to, and spaced apart from, each other. In use, the field shape and direction produced by the first coil pair are substantially mirrored by those produced by the second coil pair.

公开(公告)号：EP2382490A4

公开(公告)日：2013-01-09

申请号：EP10731114

申请日：2010-01-13

申请人： ASPECT MAGNET TECHNOLOGIES LTD

发明人： RAPOPORT URI

IPC分类号： G01R33/381 ,  A61B5/055 ,  G01R33/561 ,  G01R33/565 ,  G01V3/00

CPC分类号： A61B5/055 ,  G01R33/38 ,  G01R33/3806 ,  G01R33/381 ,  G01R33/5617 ,  G01R33/56554 ,  G01R33/56563 ,  G01R33/56581 ,  G01R33/5676

摘要： Means and methods for improving the MRI “image quality in an MRI imaging” apparatus comprising a non-superconducting electromagnet and a plurality of pole pieces are provided. Said means for improving the image quality chosen from the group consisting of (a) means for reducing degradation of MRI image quality due to B0 field instability; (b) means for decreasing or otherwise correcting residual magnetization; (c) means for providing a 3D scout image; and (d) any combination of the above. These means for improving the image quality provides greater resolution of the imaged object relative to an MRI apparatus not containing such means for improving image quality.

公开(公告)号：EP2526436A1

公开(公告)日：2012-11-28

申请号：EP11700358.2

申请日：2011-01-18

申请人： Esaote S.p.A.

发明人： BESIO, Stefano ,  BADINO, Felice ,  CARLINI, Davide ,  PITTALUGA, Stefano ,  PUNZO, Vincenzo ,  TREQUATTRINI, Alessandro

IPC分类号： G01R33/38 ,  G01R33/3873 ,  G01R33/381 ,  G01R33/383

CPC分类号： G01R33/3806 ,  G01R33/381 ,  G01R33/383 ,  G01R33/3873 ,  G01R33/3875

摘要： A Magnetic Resonance apparatus, which comprises a 3D structure having a cavity for receiving a body under examination, means (21) for generating a static magnetic field in said patient receiving cavity, means for generating variable magnetic fields, known as gradients, in said cavity, an antenna (23) for transmitting electromagnetic nuclear spin excitation pulses, an antenna for receiving the electromagnetic signals generated by nuclear spin relaxation, with a plate (1) being provided for locating and fixing magnetic dipoles for fine correction of magnetic field homogeneity, for the purposes of shimming. According to the invention, the means for generating the magnetic field have a compartment (26) for the magnetic correction dipole locating and fixing plate, said compartment being adapted to be opened for direct access to the magnetic correction dipole locating and securing plate via a lateral slot.

公开(公告)号：EP2511724A1

公开(公告)日：2012-10-17

申请号：EP12175576.3

申请日：2009-06-25

申请人： Alberta Health Services

发明人： Fallone, Gino ,  Tadic, Tony ,  Murray, Brad

IPC分类号： G01R33/38 ,  G21K1/093 ,  G01R33/381 ,  G01R33/383

CPC分类号： G01R33/543 ,  A61B5/055 ,  A61N5/1043 ,  A61N2005/1087 ,  A61N2005/1089 ,  G01R33/3806 ,  G01R33/383 ,  G06F17/50 ,  G21K1/093 ,  H01F7/0278

摘要： Disclosed herein is a method of defining a magnetic field for an imaging volume. The method comprises generating an initial model of a magnet assembly; estimating a magnetic field for the imaging volume based on the model; calculating deviation between the estimated magnetic field and a target magnetic field for the imaging volume; and updating the model to reduce the deviation by modifying the magnet assembly to produce a variety of magnetic field strengths that, in combination, produce substantially the target magnetic field in the imaging volume.

摘要翻译： 本文公开了一种为成像体积定义磁场的方法。 该方法包括产生磁体组件的初始模型; 基于该模型估计成像体积的磁场; 计算用于成像体积的估计磁场和目标磁场之间的偏差; 并且通过修改磁体组件来产生各种磁场强度来更新模型以减小偏差，其组合地在成像体积中基本上产生目标磁场。

公开(公告)号：EP2487500A1

公开(公告)日：2012-08-15

申请号：EP12000839.6

申请日：2012-02-09

申请人： Politechnika Poznanska

发明人： Kedzia, Piotr, M. Sc. Eng. ,  Szczesniak, Eugeniusz, Prof. ,  Czechowski, Tomasz, Dr. ,  Baranowski, Mikolaj, Dr. ,  Jurga, Jan, Prof.

IPC分类号： G01R33/381 ,  G01R33/421

CPC分类号： G01R33/421 ,  G01R33/381

摘要： The present invention relates to a method to generate magnetic fields of high uniformity within the object examined and compensation of external dispersed field, and a system for its embodiment, which method is applicable in magnetic resonance tomography. The method to generate magnetic fields of high uniformity within the object examined in which two pairs of coils (1) and (2) are used in which the current flows in the same direction and sense. The system is composed of two pairs of coils (1) and (2), which, preferably, have the same radiuses, are situated coaxially, are attached to the housing of the tomograph in a permanent, detachable manner, and in which the current flows in the same direction and sense.

摘要翻译： 本发明涉及一种方法来生成检查对象和外部分散字段的补偿，并且对于它的实施例，其方法适用于磁共振断层成像系统内的高均匀性的磁场。 的方法，其中，两对线圈（1）和使用（2）检查对象内产生高均匀度的磁场，其中，电流流过在相同的方向和感。 该系统是由两对线圈（1）和（2）其中，优选地，具有相同的半径，同轴地位于，连接到断层成像在一个永久性的，可拆卸的方式在壳体中，并且其中所述当前 在相同方向上与感测流动。

公开(公告)号：EP2283374A4

公开(公告)日：2012-01-04

申请号：EP09741593

申请日：2009-05-07

申请人： UNIV QUEENSLAND

发明人： TIENG QUANG MINH ,  VEGH VIKTOR ,  BRERETON IAN MALCOLM

IPC分类号： A61B5/055 ,  G01R33/381 ,  G01R33/3815

CPC分类号： G01R33/381 ,  A61B5/055 ,  G01R33/3806 ,  G01R33/3815

公开(公告)号：EP2252901A1

公开(公告)日：2010-11-24

申请号：EP09719907.9

申请日：2009-03-11

申请人： The University Of Western Ontario

发明人： ALFORD, Jamu ,  CHRONIK, Blaine ,  RUTT, Brian

IPC分类号： G01R33/48 ,  G01R33/38 ,  G01R33/381 ,  A61K49/10

CPC分类号： G01R33/445 ,  G01R33/381 ,  G01R33/50 ,  G01R33/56 ,  G01R33/5601 ,  G01R33/5602 ,  G01R33/56341

摘要： A magnetic resonance imaging method comprises performing imaging where more than one polarizing magnetic field strength is used during scanning and processing at least one image resulting from the scanning to yield an enhanced contrast image.

公开(公告)号：EP2225578A1

公开(公告)日：2010-09-08

申请号：EP08865413.2

申请日：2008-12-19

申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： OVERWEG, Johannes Adrianus ,  TIMINGER, Holger ,  DAVID, Bernd

IPC分类号： G01R33/381 ,  G01R33/385 ,  H01B12/06 ,  H01B12/16 ,  H01F7/11

CPC分类号： G01R33/381 ,  G01R33/385 ,  H01F3/02 ,  H01F7/202 ,  H01F27/34 ,  H01F2027/348

摘要： An electromagnet comprises: a ferromagnetic core (50, 72); electrically conductive windings (34, 76) disposed around the ferromagnetic core such that current flowing in the windings magnetizes the ferromagnetic core; and a superconducting film (60, 80, 82) arranged to support eddy current cancelling supercurrent that suppresses eddy current formation in the ferromagnetic core when the windings magnetize the ferromagnetic core. A magnetic resonance scanner embodiment includes a main magnet (20) generating a static magnetic field and a magnetic field gradient system (30) with a plurality of said electromagnets (34, 50, 60) configured to superimpose selected magnetic field gradients on the static magnetic field.

公开(公告)号：EP1036541A4

公开(公告)日：2005-11-02

申请号：EP98956014

申请日：1998-12-01

申请人： HITACHI MEDICAL CORP ,  HITACHI LTD

发明人： KAKUGAWA SHIGERU ,  KITAMURA SHOUJI ,  HARA NOBUHIRO ,  KOMURA AKIYOSHI ,  HINO NORIAKI ,  KAWANO HAJIME ,  HONMEI TAKAO ,  TAKESHIMA HIROTAKA ,  YATSUO TAKESHI ,  TAZAKI HIROSHI

IPC分类号： G01R33/38 ,  G01R33/381 ,  G01R33/3815 ,  A61B5/055

CPC分类号： G01R33/3806 ,  G01R33/381 ,  G01R33/3815

摘要： A magnet apparatus having two static magnetic field-generating sources constituted by current-carrying means (13 to 16) arranged concentrically to generate a uniform magnetic field directed in the first direction, each static magnetic field generating source having at least four current-carrying means. Assume that a predetermined line (18) lies in a first plane including a first axis extending in parallel with the first direction and passing through near the centers of the current-carrying means, a second axis intersecting the first axis perpendicularly and existing nearly at an equal distance from the second static magnetic field-generating source. When the geometrical center of the cross section of each current-carrying means is projected onto the predetermined straight line (18) on the first plane, the forward and reverse current-carrying directions of the corresponding current-carrying means are alternatingly arranged for each of the static magnetic field-generating sources.

摘要翻译： 一种磁体装置，包括两组静磁场产生源，每组静电磁场产生源由同时设置的载流装置构成，以便产生沿第一方向引导的均匀的磁场，该磁场设有至少四个载流装置， 假设与第一方向平行的第一轴线的交叉点，并且基本上穿过载流装置的中心，并且第二轴线与第一轴线正交地交叉并且与两组静态的基本上相等的距离 磁场产生源作为第一点，并进一步假设包含在由第一轴，第二轴和第一点限定的第一平面上并通过第一点的第一直线，载流装置以这样的方式 当在第一平面上的载流装置的横截面的几何中心被投影在第二平面上时 在第一直线上，每个静磁场产生源的各个相应的突起处的电流承载装置的当前承载方向在第一直线上在正负方向上交替排列，从而具有开放空间感和可达到 在MRI装置中改进了被检查物体。