公开(公告)号：US09513354B2

公开(公告)日：2016-12-06

申请号：US13652155

申请日：2012-10-15

Applicant: General Electric Company

Inventor： Ileana Hancu ,  Selaka Bandara Bulumulla ,  Seung-Kyun Lee

IPC: G01R33/48 ,  G01R33/32 ,  A61B5/055

CPC classification number: G01R33/48 ,  A61B5/055

Abstract: Exemplary embodiments are directed to estimating an electrical property of tissue using Magnetic Resonance (MR) images. In exemplary embodiments, complex MR images of a target tissue are obtained. An estimated value of an electrical property of the target tissue is determined based on complex values of the pixels in the complex MR images. The complex values are proportional to the product of the transmit radio frequency magnetic field and the receive RF magnetic field.

Abstract translation: 示例性实施例涉及使用磁共振（MR）图像估计组织的电性质。 在示例性实施例中，获得目标组织的复杂MR图像。 基于复数MR图像中的像素的复数值来确定目标组织的电特性的估计值。 复数值与发射射频磁场和接收RF磁场的乘积成比例。

公开(公告)号：US20160054407A1

公开(公告)日：2016-02-25

申请号：US14466551

申请日：2014-08-22

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Michael Parizh ,  Derek Allan Seeber ,  Seung-Kyun Lee ,  Jean-Baptiste Mathieu

IPC: G01R33/3875 ,  G01R33/34

CPC classification number: G01R33/3875

Abstract: Embodiments of the invention are utilized to improve shimming capability while reducing radial space and the volume required to contain active shim coils by nesting the coils of different degrees and orders inside each other and limiting the azimuthal span of the individual saddle coils. This allows two or more radial shim sets to be combined together in the same layer resulting in a significant radial savings that increases the useable portion of an MRI system.

Abstract translation: 本发明的实施例用于通过将不同程度和顺序的线圈彼此嵌套并限制单个鞍形线圈的方位角跨度来减小径向空间和包含有效垫片线圈所需的体积，从而改善匀场能力。 这允许将两个或更多个径向垫片组合在同一层中，导致显着的径向节省，从而增加MRI系统的可用部分。

公开(公告)号：US09069998B2

公开(公告)日：2015-06-30

申请号：US13652231

申请日：2012-10-15

Applicant: General Electric Company

Inventor： Selaka Bandara Bulumulla ,  Ileana Hancu ,  Seung-Kyun Lee

IPC: G06K9/00 ,  G06K9/32 ,  G06K9/34 ,  G06T11/00

CPC classification number: G06K9/00 ,  A61B5/055 ,  A61B5/4869 ,  G01R33/246 ,  G01R33/48 ,  G06K9/3233 ,  G06K9/342 ,  G06T11/003

Abstract: Exemplary embodiments of the present disclosure are directed to estimating an electrical property of tissue using MR images. Complex values having real components and imaginary components are generated and are associated with pixels in one or more MR images that corresponding to a region of tissue for which the electrical property is constant. An estimated value of the electrical property for the region of tissue is determined based on a least squared error estimation applied to the complex values.

Abstract translation: 本公开的示例性实施例涉及使用MR图像估计组织的电性质。 生成具有真实分量和虚部的复数值，并且与一个或多个MR图像中的对应于电性能不变的组织区域的像素相关联。 基于应用于复数值的最小二乘误差估计来确定组织区域的电特性的估计值。

公开(公告)号：US20150115955A1

公开(公告)日：2015-04-30

申请号：US14067701

申请日：2013-10-30

Applicant: General Electric Company

Inventor： Seung-Kyun Lee ,  Christopher Judson Hardy ,  Ek Tsoon Tan

IPC: G01R33/561

CPC classification number: G01R33/561 ,  G01R33/4835 ,  G01R33/5611

Abstract: Magnetic resonance imaging systems and methods are provided. A method includes applying a slice selection gradient perpendicular to a desired slice plane and applying, substantially simultaneously with the slice selection gradient, a radiofrequency nuclear magnetic resonance excitation pulse having a bandwidth corresponding to the desired slice plane and a frequency corresponding to the frequency of protons present in the desired slice plane. The method also includes applying, during an encoding period and in a first direction, a phase encoding gradient having a phase encoding portion and a shearing portion and applying, during the readout period and in a second direction perpendicular to the first direction, a frequency encoding gradient having a portion having substantially the same shape as the shearing portion of the phase encoding gradient.

Abstract translation: 提供磁共振成像系统和方法。 一种方法包括应用垂直于期望切片平面的切片选择梯度并且基本上与切片选择梯度一起施加具有对应于期望切片平面的带宽和对应于质子频率的频率的射频核磁共振激励脉冲 存在于期望的切片平面中。 该方法还包括在编码周期期间和在第一方向上应用具有相位编码部分和剪切部分的相位编码梯度，并且在读出期间和垂直于第一方向的第二方向上应用频率编码 梯度具有与相位编码梯度的剪切部分基本上相同形状的部分。