公开(公告)号：US20060006866A1

公开(公告)日：2006-01-12

申请号：US10518982

申请日：2003-06-13

申请人： Nicolaas Roozen ,  David Biloen ,  Johannes Overweg

发明人： Nicolaas Roozen ,  David Biloen ,  Johannes Overweg

IPC分类号： G01V3/00

CPC分类号： G01R33/3854

摘要： The invention relates to a magnetic resonance imaging (MRI) system (1) comprising an examination volume (11) in which a patient to be examined can be accommodated, a main magnet system (3) for generating a magnetic field having a main field portion (17) in the examination volume with a substantially constant magnetic field strength (B0), and a gradient magnet system (13) for generating gradients of the main field portion. The MRI system further comprises a damping member (25, 27) which is mounted to a part (5) of the MRI system susceptible to vibrations relative to the magnetic field during operation. Said damping member comprises an electrically conductive member (29, 35, 37) which is present in the magnetic field and in which eddy currents are generated as a result of said vibrations. According to the invention, the conductive member (29, 35, 37) is arranged in a secondary portion of the magnetic field at a distance from the main field portion (17), which secondary portion has a magnetic field strength which differs by more than 25% from the magnetic field strength (B0) of the main field portion. In this manner, the distance between the conductive member and the main field portion is sufficiently large to prevent the eddy currents in the conductive member from causing unacceptable distortions of the main field portion, while, on the other hand, the magnetic field strength in said secondary portion is still sufficiently large to provide an adequate damping effect of the damping member (25, 27). The damping member (25, 27) can for example be mounted to a housing (5) of the main magnet system (3). Alternatively, the damping member (139, 141) can be mounted to the gradient magnet system (127). In another embodiment the damping member (27) is mounted to a rigid portion of the MRI system (1), for example to the supporting member (21), which does hardly vibrate during operation. In this embodiment, the damping member (27) is used to damp the vibrations of the magnetic field generating portions (9) of the main magnet system (3).

公开(公告)号：US20080246348A1

公开(公告)日：2008-10-09

申请号：US12064967

申请日：2006-08-10

申请人： Georgo Angelis ,  David Biloen

发明人： Georgo Angelis ,  David Biloen

IPC分类号： H02K41/02

CPC分类号： H02K41/02 ,  H02K3/47 ,  H02K11/00 ,  H02K16/02 ,  H02K41/031 ,  H02K2201/18

摘要： A ironless magnetic motor (21-23) employs a magnetic track (30) and a forcer (40). The forcer (40) is orientated a magnetic field (β) across a linear air gap of the magnetic track (30) to generate a drive force (FX) parallel to the X drive axis and orthogonal to the Z levitation axis in response to a commutation drive current (IX) and to generate a force (FZ, FY) orthogonal to the X drive axis in response to a commutation coil current (IZ, IY) being superimposed on and phase shifted from the commutation drive current (IX). To this end, a set of levitating turns of the coil (41) parallel to the X drive axis and orthogonal to the Z levitation axis may be internal or external to magnetic field (β), and the forcer (40) may be centered or offset from a center X-Z longitudinal axis (CP) of the linear air gap.

摘要翻译： 无铁磁电动机（21-23）采用磁轨（30）和锻炼机（40）。 锻炼器（40）沿着磁道（30）的线性气隙定向磁场（β），以产生平行于X驱动轴线的驱动力（F SUB），并与 响应于换向驱动电流（I SUB X X）的Z悬浮轴并且产生正交于（...）的力（F 1，Z 2，F Y Y） 响应于换向线圈电流（I SUB，I SUB）的X驱动轴被叠加在换向驱动电流上并从换向驱动电流（I < / SUB>）。 为此，与X驱动轴平行并且与Z悬浮轴垂直的线圈（41）的一组悬浮匝可以是内部或外部的磁场（β），并且所述推进器（40）可以居中或 偏离线性气隙的中心XZ纵向轴线（CP）。

公开(公告)号：US07372271B2

公开(公告)日：2008-05-13

申请号：US10598670

申请日：2005-03-08

申请人： Nicolaas Bernardus Roozen ,  Martijn Roger La Grange ,  David Biloen

发明人： Nicolaas Bernardus Roozen ,  Martijn Roger La Grange ,  David Biloen

IPC分类号： G01V3/00

CPC分类号： G01R33/3854 ,  G01R33/4215

摘要： The present invention relates to a magnetic resonance imaging (MRI) device. The basic components of an MRI device are the main magnet system (2), the gradient system (3), the RF system and the signal processing system. According to the present invention, the magnetic resonance imaging (MRI) device has an eddy current shield system, wherein the eddy current shield system comprises at least one perforated eddy current screen (13, 14), and wherein the or each perforated eddy current screen (13, 14) is assigned to the main magnet system (2).

摘要翻译： 磁共振成像（MRI）装置技术领域本发明涉及磁共振成像（MRI）装置。 MRI设备的基本组成部分是主磁体系统（2），梯度系统（3），射频系统和信号处理系统。 根据本发明，磁共振成像（MRI）装置具有涡流屏蔽系统，其中涡流屏蔽系统包括至少一个穿孔涡流屏（13,14），并且其中所述或每个穿孔涡流屏 （13,14）被分配给主磁体系统（2）。

公开(公告)号：US08803372B2

公开(公告)日：2014-08-12

申请号：US12064967

申请日：2006-08-10

申请人： Georgo Angelis ,  David Biloen

发明人： Georgo Angelis ,  David Biloen

IPC分类号： H02K41/02

CPC分类号： H02K41/02 ,  H02K3/47 ,  H02K11/00 ,  H02K16/02 ,  H02K41/031 ,  H02K2201/18

摘要： An ironless magnetic motor includes a magnetic track and a forcer. The forcer is oriented in a magnetic field across a linear air gap of the magnetic track to generate a drive force parallel to the X drive axis and orthogonal to the Z levitation axis in response to a commutation drive current and to generate a force orthogonal to the X drive axis in response to a commutation coil current being superimposed on and phase shifted from the commutation drive current. To this end, a set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis may be internal or external to magnetic field, and the forcer may be centered or offset from a center X-Z longitudinal axis (CP) of the linear air gap.

摘要翻译： 无铁磁电机包括磁轨和锻炼机。 锻炼器在磁场的线性气隙中的磁场中取向，以响应于换向驱动电流产生平行于X驱动轴并且垂直于Z悬浮轴的驱动力，并且产生与 X驱动轴响应于换向线圈电流被叠加在换向驱动电流上并从换向驱动电流相移。 为此，平行于X驱动轴线并且垂直于Z悬浮轴线的线圈的一组悬浮匝可以在磁场内部或外部，并且该锻炼器可以居中或偏离中心XZ纵向轴线（CP ）的线性气隙。

公开(公告)号：US20070176602A1

公开(公告)日：2007-08-02

申请号：US10598670

申请日：2005-03-08

申请人： Nicolaas Roozen ,  Martijn La Grange ,  David Biloen

发明人： Nicolaas Roozen ,  Martijn La Grange ,  David Biloen

IPC分类号： G01V3/00

CPC分类号： G01R33/3854 ,  G01R33/4215

摘要： The present invention relates to a magnetic resonance imaging (MRI) device. The basic components of an MRI device are the main magnet system (2), the gradient system (3), the RF system and the signal processing system. According to the present invention, the magnetic resonance imaging (MRI) device has an eddy current shield system, wherein the eddy current shield system comprises at least one perforated eddy current screen (13, 14), and wherein the or each perforated eddy current screen (13, 14) is assigned to the main magnet system (2).

摘要翻译： 磁共振成像（MRI）装置技术领域本发明涉及磁共振成像（MRI）装置。 MRI设备的基本组成部分是主磁体系统（2），梯度系统（3），射频系统和信号处理系统。 根据本发明，磁共振成像（MRI）装置具有涡流屏蔽系统，其中涡流屏蔽系统包括至少一个穿孔涡流屏（13,14），并且其中所述或每个穿孔涡流屏 （13,14）被分配给主磁体系统（2）。