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公开(公告)号：US10261145B2
公开(公告)日：2019-04-16
申请号：US14648485
申请日：2013-12-02
申请人： Lawrence Wald , Jason Stockmann
发明人： Lawrence Wald , Jason Stockmann
IPC分类号： G01V3/00 , G01R33/3415 , G01R33/341 , G01R33/3875 , A61B5/055
摘要： A system and method for magnetic resonance imaging (MRI) and static field (B0) shimming. A coil system includes a conductive loop configured to be arranged proximate to a region of interest (ROI). The coil system also includes an alternating current (AC) circuit electrically connecting the conductive loop to an AC electrical connection configured to be coupled to an MRI system to communicate medical imaging signals received by the conductive loop from the ROI during a medical imaging procedure to the MRI system. The coil system further includes a direct current (DC) circuit electrically connecting the conductive loop to a DC electrical connection configured to be coupled to a DC power source and a plurality of circuit components configured to block DC signals from reaching the AC electrical connection in order to produce a spatially varying static magnetic field for shimming inhomogenieties of the static field.
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2.发明申请SYSTEM AND METHOD FOR IMPROVED RADIO-FREQUENCY DETECTION OR B0 FIELD SHIMMING IN MAGNETIC RESONANCE IMAGING 审中-公开用于改进无线电频率检测的系统和方法或B0磁场共振成像中的场景公开(公告)号：US20150323628A1
公开(公告)日：2015-11-12
申请号：US14648485
申请日：2013-12-02
申请人： Lawrence WALD , Jason STOCKMANN
发明人： Lawrence Wald , Jason Stockmann
IPC分类号： G01R33/3875 , G01R33/341
CPC分类号： G01R33/3415 , A61B5/055 , G01R33/341 , G01R33/3875
摘要： A system and method for magnetic resonance imaging (MRI) and static field (B0) shimming. A coil system includes a conductive loop configured to be arranged proximate to a region of interest (ROI). The coil system also includes an alternating current (AC) circuit electrically connecting the conductive loop to an AC electrical connection configured to be coupled to an MRI system to communicate medical imaging signals received by the conductive loop from the ROI during a medical imaging procedure to the MRI system. The coil system further includes a direct current (DC) circuit electrically connecting the conductive loop to a DC electrical connection configured to be coupled to a DC power source and a plurality of circuit components configured to block DC signals from reaching the AC electrical connection in order to produce a spatially varying static magnetic field for shimming inhomogenieties of the static field.
摘要翻译： 用于磁共振成像（MRI）和静态场（B0）匀场的系统和方法。 线圈系统包括被布置成靠近感兴趣区域（ROI）布置的导电回路。 线圈系统还包括将导电回路电连接到AC电连接的交流电（AC）电路，AC电连接被配置为耦合到MRI系统，以将在医疗成像过程期间由导电回路接收的医学成像信号从ROI传送到ROI MRI系统。 线圈系统还包括直流（DC）电路，其将导电回路电连接到被配置为耦合到DC电源的DC电连接，以及多个电路部件，其被配置为阻止DC信号按顺序到达AC电连接 以产生空间变化的静磁场，用于匀场静电场的不均匀分布。
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公开(公告)号：US10359481B2
公开(公告)日：2019-07-23
申请号：US14408187
申请日：2012-10-22
IPC分类号： G01V3/00 , G01R33/34 , A61B5/055 , A61B5/00 , G01R33/383 , G01R33/28 , G01R33/46 , G01R33/38 , G01R33/48 , G01R33/44
摘要： A portable magnetic resonance imaging (“MRI”) system that uses static magnetic field inhomogeneities in the main magnet for encoding the spatial location of nuclear spins is provided. Also provided is a spatial-encoding scheme for a low-field, low-power consumption, light-weight, and easily transportable MRI system. In general, the portable MRI system spatially encodes images using spatial inhomogeneities in the polarizing magnetic field rather than using gradient fields. Thus, an inhomogeneous static field is used to polarize, readout, and encode an image of the object. To provide spatial encoding, the magnet is rotated around the object to generate a number of differently encoded measurements. An image is then reconstructed by solving for the object most consistent with the data.
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4.发明授权O-space imaging: highly efficient parallel imaging using complementary nonlinear encoding gradient fields and receive coil geometries 有权O空间成像：使用互补非线性编码梯度场和接收线圈几何的高效并行成像公开(公告)号：US08710839B2
公开(公告)日：2014-04-29
申请号：US12998877
申请日：2009-12-14
IPC分类号： G01R33/3415
CPC分类号： G01R33/5611 , G01R33/3415 , G01R33/4824
摘要： In MRI by excitation of nuclear spins and measurement of RF signals induced by these spins in the presence of spatially-varying encoding magnetic fields, signal localization is performed through recombination of measurements obtained in parallel by each coil in an encircling array of RF receiver coils. Through the use of magnetic gradient fields that vary both as first-order and second-order Z2 spherical harmonics with position, radially-symmetric magnetic encoding fields are created that are complementary to the spatial variation of the encircling receiver coils. The resultant hybrid encoding functions comprised of spatially-varying coil profiles and gradient fields permits unambiguous localization of signal contributed by spins. Using hybrid encoding functions in which the gradient shapes are thusly tailored to the encircling array of coil profiles, images are acquired in less time than is achievable from a conventional acquisition employing only first-order gradient fields with an encircling coil array.
摘要翻译： 在存在空间变化的编码磁场的情况下通过激发核自旋的MRI和由这些自旋引起的RF信号的测量，通过在RF接收器线圈的环绕阵列中由每个线圈并联获得的测量的复合来执行信号定位。 通过使用随位置变化的一阶和二阶Z2球谐波的磁梯度场，产生与环绕的接收器线圈的空间变化互补的径向对称磁编码场。 由空间变化的线圈轮廓和梯度场组成的所得混合编码功能允许由旋转贡献的信号的明确定位。 使用这样的混合编码函数，其中梯度形状因此被适应于线圈轮廓的环绕阵列，在比仅采用具有环绕线圈阵列的一阶梯度场的常规采集可获得的时间更少的时间内获取图像。
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公开(公告)号：US20120286783A1
公开(公告)日：2012-11-15
申请号：US13518096
申请日：2010-12-22
IPC分类号： G01R33/48
CPC分类号： G01R33/5611 , G01R33/385
摘要： In a method of magnetic resonance imaging, a set of nonlinear, mutually orthogonal magnetic gradient encoding fields are sequentially and separately generated in an imaging region [100]. Using multiple receiver coils having nonuniform sensitivity profiles, echo data representing signal intensities in the imaging region is sequentially acquired as the magnetic gradient encoding fields are sequentially generated [102]. A reconstructed image of the imaging region is computed from the acquired echo data [104], and the reconstructed image is then be stored and/or displayed on a display monitor [106].
摘要翻译： 在磁共振成像的方法中，在成像区域[100]中依次分别生成一组非线性的相互正交的磁梯度编码场。 使用具有不均匀灵敏度分布的多个接收器线圈，随着顺序产生磁梯度编码场，依次获取表示成像区域中的信号强度的回波数据[102]。 从获取的回波数据[104]计算成像区域的重建图像，然后将重建的图像存储和/或显示在显示监视器[106]上。
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公开(公告)号：US09229081B2
公开(公告)日：2016-01-05
申请号：US13518096
申请日：2010-12-22
IPC分类号： G01V3/00 , G01R33/561 , G01R33/385
CPC分类号： G01R33/5611 , G01R33/385
摘要： In a method of magnetic resonance imaging, a set of nonlinear, mutually orthogonal magnetic gradient encoding fields are sequentially and separately generated in an imaging region [100]. Using multiple receiver coils having nonuniform sensitivity profiles, echo data representing signal intensities in the imaging region is sequentially acquired as the magnetic gradient encoding fields are sequentially generated [102]. A reconstructed image of the imaging region is computed from the acquired echo data [104], and the reconstructed image is then be stored and/or displayed on a display monitor [106].
摘要翻译： 在磁共振成像的方法中，在成像区域[100]中依次分别生成一组非线性的相互正交的磁梯度编码场。 使用具有不均匀灵敏度分布的多个接收器线圈，随着顺序产生磁梯度编码场，依次获取表示成像区域中的信号强度的回波数据[102]。 从获取的回波数据[104]计算成像区域的重建图像，然后将重建的图像存储和/或显示在显示监视器[106]上。
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公开(公告)号：US20110241675A1
公开(公告)日：2011-10-06
申请号：US12998877
申请日：2009-12-14
IPC分类号： G01R33/48
CPC分类号： G01R33/5611 , G01R33/3415 , G01R33/4824
摘要： In MRI by excitation of nuclear spins and measurement of RF signals induced by these spins in the presence of spatially-varying encoding magnetic fields, signal localization is performed through recombination of measurements obtained in parallel by each coil in an encircling array of RF receiver coils. Through the use of magnetic gradient fields that vary both as first-order and second-order Z2 spherical harmonics with position, radially-symmetric magnetic encoding fields are created that are complementary to the spatial variation of the encircling receiver coils. The resultant hybrid encoding functions comprised of spatially-varying coil profiles and gradient fields permits unambiguous localization of signal contributed by spins. Using hybrid encoding functions in which the gradient shapes are thusly tailored to the encircling array of coil profiles, images are acquired in less time than is achievable from a conventional acquisition employing only first-order gradient fields with an encircling coil array.
摘要翻译： 在存在空间变化的编码磁场的情况下通过激发核自旋的MRI和由这些自旋引起的RF信号的测量，通过在RF接收器线圈的环绕阵列中由每个线圈并联获得的测量的复合来执行信号定位。 通过使用随位置变化的一阶和二阶Z2球谐波的磁梯度场，产生与环绕的接收器线圈的空间变化互补的径向对称磁编码场。 由空间变化的线圈轮廓和梯度场组成的所得混合编码功能允许由旋转贡献的信号的明确定位。 使用这样的混合编码函数，其中梯度形状因此被适应于线圈轮廓的环绕阵列，在比仅采用具有环绕线圈阵列的一阶梯度场的常规采集可获得的时间更少的时间内获取图像。
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