公开(公告)号：US20110050229A1

公开(公告)日：2011-03-03

申请号：US12861871

申请日：2010-08-24

Applicant: Jin Jun Chen ,  Cheng Ni

Inventor： Jin Jun Chen ,  Cheng Ni

IPC: G01R33/44

CPC classification number: G01R33/3873 ,  G01R33/3875

Abstract: In a method and device for compensating the insufficient homogeneity of a magnetic field in a magnetic resonance system, the spatial position and size of a basic magnetic field region and at least one additional magnetic field region in a field to be homogenized and determined. An optimization calculation is implemented on the basic magnetic field region and the at least one additional magnetic field region. A homogenized magnetic field at the main magnetic field region and the at least one additional magnetic field region is output according to the result of the optimization calculation.

Abstract translation: 在用于补偿磁共振系统中的磁场不均匀性的方法和装置中，基本磁场区域的空间位置和尺寸以及要均匀化并确定的场中的至少一个附加磁场区域。 在基本磁场区域和至少一个附加磁场区域上实现优化计算。 根据优化计算的结果，输出主磁场区域和至少一个附加磁场区域的均匀化磁场。

公开(公告)号：US20100249668A1

公开(公告)日：2010-09-30

申请号：US12712444

申请日：2010-02-25

Applicant: Xiao Dong Zhou ,  Florian Steinmeyer ,  Cheng Ni

Inventor： Xiao Dong Zhou ,  Florian Steinmeyer ,  Cheng Ni

IPC: A61N7/00

CPC classification number: A61N7/02 ,  A61B2017/00084 ,  A61B2090/374 ,  A61N2007/0056 ,  A61N2007/0078

Abstract: An ultrasonic transducer has at least two sets of transducer units, with all the transducer units in each set having the same focus position and the transducer units in the different sets having different focus positions. Since the focus points of the sets of ultrasonic transducer units are distributed in a relatively large spatial range, the range of ultrasonic therapy can be increased even within the narrow and limited space of magnetic resonance imaging equipment.

Abstract translation: 超声换能器具有至少两组换能器单元，每组中的所有换能器单元具有相同的焦点位置，并且不同组中的换能器单元具有不同的焦点位置。 由于超声波换能器组的聚焦点分布在相当大的空间范围内，所以即使在磁共振成像设备的狭窄且有限的空间内也能够提高超声波治疗的范围。

公开(公告)号：US20080204024A1

公开(公告)日：2008-08-28

申请号：US12039099

申请日：2008-02-28

Applicant: Jing Gao ,  Cheng Ni ,  Zhong You Ren ,  Chao Wang

Inventor： Jing Gao ,  Cheng Ni ,  Zhong You Ren ,  Chao Wang

IPC: G01R33/28

CPC classification number: G01R33/3806 ,  G01R33/385 ,  G01R33/389

Abstract: 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.

Abstract translation: 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。