公开(公告)号：US07633292B2

公开(公告)日：2009-12-15

申请号：US12039099

申请日：2008-02-28

申请人： Jing Gao ,  Cheng Ni ,  Zhong You Ren ,  Chao Wang

发明人： Jing Gao ,  Cheng Ni ,  Zhong You Ren ,  Chao Wang

IPC分类号： G01V3/00

CPC分类号： G01R33/3806 ,  G01R33/385 ,  G01R33/389

摘要： A method for reducing eddy currents caused by the gradient magnetic field in a magnetic resonance system employs an anti-eddy current device formed by a number of laminated metallic plates, and includes the steps of calculating the distribution of the main magnetic field of the magnetic resonance system in the anti-eddy current device, calculating the distribution of the main magnetic field and the gradient magnetic field in the anti-eddy current device, subtracting the calculated distribution of the main magnetic field in the anti-eddy current device from the calculated distribution of the main magnetic field and the gradient magnetic field in the anti-eddy current device, to obtain the distribution of the gradient magnetic field in the anti-eddy current device, and adjusting the setting of the metallic plates of the anti-eddy current device based on the distribution of the gradient magnetic field in the anti-eddy current device, so as to reduce the eddy current. The adjustment in the metallic plates of the anti-eddy current device should be such that the gradient magnetic field is parallel to or substantially parallel to the plane of the metallic plates. The metallic plates can be further divided into a number of areas, or the laminating direction of the metallic plates in different areas can be adjusted according to the specific distribution of the gradient magnetic field to obtain the optimum effect of eddy current reduction.

摘要翻译： 一种用于减小由磁共振系统中的梯度磁场引起的涡流的方法采用由多个层叠的金属板形成的抗涡流装置，并且包括以下步骤：计算磁共振的主磁场分布 系统在反涡流装置中计算反涡流装置中主磁场和梯度磁场的分布，从计算出的分布中减去计算出的反涡流装置中主磁场的分布 的反涡流装置中的主磁场和梯度磁场，以获得反涡流装置中梯度磁场的分布，并且调整反涡流装置的金属板的设置 基于反涡流装置中梯度磁场的分布，以减少涡流。 防涡流装置的金属板的调整应使得梯度磁场平行于或基本平行于金属板的平面。 金属板可以进一步分为多个区域，也可以根据梯度磁场的特定分布调整不同区域的金属板的层叠方向，以获得涡流减少的最佳效果。

公开(公告)号：US20080204024A1

公开(公告)日：2008-08-28

申请号：US12039099

申请日：2008-02-28

申请人： Jing Gao ,  Cheng Ni ,  Zhong You Ren ,  Chao Wang

发明人： Jing Gao ,  Cheng Ni ,  Zhong You Ren ,  Chao Wang

IPC分类号： G01R33/28

CPC分类号： G01R33/3806 ,  G01R33/385 ,  G01R33/389

摘要： A method for reducing eddy currents caused by the gradient magnetic field in a magnetic resonance system employs an anti-eddy current device formed by a number of laminated metallic plates, and includes the steps of calculating the distribution of the main magnetic field of the magnetic resonance system in the anti-eddy current device, calculating the distribution of the main magnetic field and the gradient magnetic field in the anti-eddy current device, subtracting the calculated distribution of the main magnetic field in the anti-eddy current device from the calculated distribution of the main magnetic field and the gradient magnetic field in the anti-eddy current device, to obtain the distribution of the gradient magnetic field in the anti-eddy current device, and adjusting the setting of the metallic plates of the anti-eddy current device based on the distribution of the gradient magnetic field in the anti-eddy current device, so as to reduce the eddy current. The adjustment in the metallic plates of the anti-eddy current device should be such that the gradient magnetic field is parallel to or substantially parallel to the plane of the metallic plates. The metallic plates can be further divided into a number of areas, or the laminating direction of the metallic plates in different areas can be adjusted according to the specific distribution of the gradient magnetic field to obtain the optimum effect of eddy current reduction.

摘要翻译： 一种用于减小由磁共振系统中的梯度磁场引起的涡流的方法采用由多个层叠的金属板形成的抗涡流装置，并且包括以下步骤：计算磁共振的主磁场分布 系统在反涡流装置中计算反涡流装置中主磁场和梯度磁场的分布，从计算出的分布中减去计算出的反涡流装置中主磁场的分布 的反涡流装置中的主磁场和梯度磁场，以获得反涡流装置中梯度磁场的分布，并且调整反涡流装置的金属板的设置 基于反涡流装置中梯度磁场的分布，以减少涡流。 防涡流装置的金属板的调整应使得梯度磁场平行于或基本平行于金属板的平面。 金属板可以进一步分为多个区域，也可以根据梯度磁场的特定分布调整不同区域的金属板的层叠方向，以获得涡流减少的最佳效果。

公开(公告)号：US07218114B2

公开(公告)日：2007-05-15

申请号：US11394629

申请日：2006-03-31

申请人： Cheng Ni ,  Hui Cao ,  Jin Jun Chen ,  Zhong You Ren

发明人： Cheng Ni ,  Hui Cao ,  Jin Jun Chen ,  Zhong You Ren

IPC分类号： G01V3/00

CPC分类号： G01R33/3873 ,  G01R33/3875

摘要： In a shimming method for an irregular object to be examined by magnetic resonant equipment magnetic field parameters are measured at measurement points located on the surface of an irregular object to be examined. Based on the measured magnetic field parameters, the positions and number of shims for adjusting magnetic field homogeneity are calculated when a passive shimming is to be performed, or the current value in a shimming coil are calculated when an active shimming is to be performed, or at the same time both the positions and number of shims and current value in the shimming coil are calculated when active shimming and passive shimming are to be performed at the same time. Shimming is then performed according to the calculated results. These above steps are repeated until achieving required magnetic field homogeneity. Since the homogeneous region is designed to have an irregular shape, it can provide a better coverage of the irregular object to be examined, and at the same time it reduces the shimming constraints to the unnecessary regions outside the irregular object to be examined, therefore avoiding shimming in those unnecessary regions.

摘要翻译： 在通过磁共振设备检查的不规则物体的匀场方法中，在位于待检查的不规则物体的表面上的测量点处测量磁场参数。 基于测量的磁场参数，当要执行被动匀场调整时计算用于调整磁场均匀性的垫片的位置和数量，或者当要执行活动匀场时计算匀场线圈中的当前值，或 同时，当同时进行有效匀场和被动匀场时，同时计算匀场线圈的位置和数量以及匀场线圈中的当前值。 然后根据计算结果执行匀场。 重复上述步骤，直到达到所需的磁场均匀性。 由于均匀区域被设计成具有不规则形状，所以可以提供对待检查的不规则物体的更好的覆盖，并且同时将匀场限制减小到待检查的不规则物体之外的不需要的区域，因此避免 在这些不必要的地区。

公开(公告)号：US07679365B2

公开(公告)日：2010-03-16

申请号：US12022282

申请日：2008-01-30

申请人： Xi Yang Du ,  Huai Yu Pan ,  Zhong You Ren ,  Xing En Yu

发明人： Xi Yang Du ,  Huai Yu Pan ,  Zhong You Ren ,  Xing En Yu

IPC分类号： G01V3/00

CPC分类号： G01R33/3815 ,  G01R33/3804 ,  H01F6/065

摘要： A current lead for the superconducting magnet of a magnetic resonance system, the superconducting magnet being refrigerated by a cold head, has a positive current lead and a negative current lead electrically connected to the superconducting magnet for magnetization thereof. The cold head is electrically connected to the superconducting magnet and is used as one of the positive and negative current leads. The cold head is used as the positive current lead or the negative current lead so as to reduce the number of current leads as well as the heat conducted by the current lead, therefore it maintains a stable superconducting environment more efficiently. Furthermore, the cold head and the current lead can be provided in the same conduit without the need to design a separated turret tube and side tube, and the structure of the current leads of the superconducting magnet of the magnetic resonance system is simplified.

摘要翻译： 用于冷磁头的超导磁体的磁共振系统的超导磁体的电流引线具有与超导磁体电连接的用于磁化的正电流引线和负电流引线。 冷头电连接到超导磁体，并用作正极和负极引线之一。 冷头用作正电流引线或负电流引线，以减少电流引线的数量以及电流引线所传导的热量，从而更有效地保持了稳定的超导环境。 此外，冷头和电流引线可以设置在相同的管道中，而不需要设计分离的转塔管和侧管，并且简化了磁共振系统的超导磁体的电流引线的结构。

公开(公告)号：US20080180105A1

公开(公告)日：2008-07-31

申请号：US12022282

申请日：2008-01-30

申请人： Xi Yang Du ,  Huai Yu Pan ,  Zhong You Ren ,  Xing En Yu

发明人： Xi Yang Du ,  Huai Yu Pan ,  Zhong You Ren ,  Xing En Yu

IPC分类号： G01V3/00

CPC分类号： G01R33/3815 ,  G01R33/3804 ,  H01F6/065

摘要： A current lead for the superconducting magnet of a magnetic resonance system, the superconducting magnet being refrigerated by a cold head, has a positive current lead and a negative current lead electrically connected to the superconducting magnet for magnetization thereof. The cold head is electrically connected to the superconducting magnet and is used as one of the positive and negative current leads. The cold head is used as the positive current lead or the negative current lead so as to reduce the number of current leads as well as the heat conducted by the current lead, therefore it maintains a stable superconducting environment more efficiently. Furthermore, the cold head and the current lead can be provided in the same conduit without the need to design a separated turret tube and side tube, and the structure of the current leads of the superconducting magnet of the magnetic resonance system is simplified.

摘要翻译： 用于冷磁头的超导磁体的磁共振系统的超导磁体的电流引线具有与超导磁体电连接的用于磁化的正电流引线和负电流引线。 冷头电连接到超导磁体，并用作正极和负极引线之一。 冷头用作正电流引线或负电流引线，以减少电流引线的数量以及电流引线所传导的热量，从而更有效地保持了稳定的超导环境。 此外，冷头和电流引线可以设置在相同的管道中，而不需要设计分离的转塔管和侧管，并且简化了磁共振系统的超导磁体的电流引线的结构。