公开(公告)号：US20130187650A1

公开(公告)日：2013-07-25

申请号：US13355937

申请日：2012-01-23

申请人： Josef Pfeuffer ,  Lawrence Wald

发明人： Josef Pfeuffer ,  Lawrence Wald

IPC分类号： G01R33/565 ,  G01R33/3415

CPC分类号： G01R33/243 ,  G01R33/4616 ,  G01R33/4835 ,  G01R33/5616 ,  G01R33/56563

摘要： In a method for calculating a B0 field map (a map of the basic magnetic field) in a magnetic resonance apparatus, a navigator pulse is emitted and navigator response resulting from the navigator pulse are detected in at least some channels of a multichannel RF coil array. Each channel of the multichannel RF coil array includes an RF coil and spatial information regarding the respective positions of the individual RF coils is made available to a processor, together with the multiple navigator signals. Using the spatial information obtained from the position of the RF coils that respectively detected the navigator response signals, a B0 field map is generated, without the need for spatial encoding the respective navigator response signals.

摘要翻译： 在用于计算磁共振装置中的B0场映射（基本磁场的映射）的方法中，发射导航脉冲，并且在多通道RF线圈阵列的至少一些通道中检测由导航脉冲导致的导航器响应 。 多通道RF线圈阵列的每个通道包括RF线圈，并且关于各个RF线圈的相应位置的空间信息与多个导航器信号一起可用于处理器。 使用从分别检测到导航器响应信号的RF线圈的位置获得的空间信息，生成B0场映射，而不需要对各个导航器响应信号进行空间编码。

公开(公告)号：US09041396B2

公开(公告)日：2015-05-26

申请号：US13355937

申请日：2012-01-23

申请人： Josef Pfeuffer ,  Lawrence Wald

发明人： Josef Pfeuffer ,  Lawrence Wald

IPC分类号： G01V3/00 ,  G01R33/24 ,  G01R33/46 ,  G01R33/565 ,  G01R33/483 ,  G01R33/561

CPC分类号： G01R33/243 ,  G01R33/4616 ,  G01R33/4835 ,  G01R33/5616 ,  G01R33/56563

摘要： In a method for calculating a B0 field map (a map of the basic magnetic field) in a magnetic resonance apparatus, a navigator pulse is emitted and navigator response resulting from the navigator pulse are detected in at least some channels of a multichannel RF coil array. Each channel of the multichannel RF coil array includes an RF coil and spatial information regarding the respective positions of the individual RF coils is made available to a processor, together with the multiple navigator signals. Using the spatial information obtained from the position of the RF coils that respectively detected the navigator response signals, a B0 field map is generated, without the need for spatial encoding the respective navigator response signals.

摘要翻译： 在用于计算磁共振装置中的B0场映射（基本磁场的映射）的方法中，发射导航脉冲，并且在多通道RF线圈阵列的至少一些通道中检测由导航脉冲导致的导航器响应 。 多通道RF线圈阵列的每个通道包括RF线圈，并且关于各个RF线圈的相应位置的空间信息与多个导航器信号一起可用于处理器。 使用从分别检测到导航器响应信号的RF线圈的位置获得的空间信息，生成B0场映射，而不需要对各个导航器响应信号进行空间编码。

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.

公开(公告)号：US20150323633A1

公开(公告)日：2015-11-12

申请号：US14707598

申请日：2015-05-08

申请人： Stephen Cauley ,  Berkin Bilgic ,  Kawin Setsompop ,  Lawrence Wald

发明人： Stephen Cauley ,  Berkin Bilgic ,  Kawin Setsompop ,  Lawrence Wald

IPC分类号： G01R33/561 ,  G01R33/567 ,  G01R33/385

CPC分类号： G01R33/5608 ,  G01R33/385 ,  G01R33/5611 ,  G01R33/5615 ,  G01R33/5673

摘要： Systems and methods for reconstructing images using a hierarchically semiseparable (“HSS”) solver to compactly represent the inverse encoding matrix used in the reconstruction are provided. The reconstruction method includes solving for the actual inverse of the encoding matrix using a direct (i.e., non-iterative) HSS solver. This approach is contrary to conventional reconstruction methods that repetitively evaluate forward models (e.g., compressed sensing or parallel imaging forward models).

摘要翻译： 提供了使用分层半分离（“HSS”）求解器重建图像的系统和方法，以紧凑地表示重构中使用的逆编码矩阵。 重建方法包括使用直接（即非迭代）HSS求解器求解编码矩阵的实际逆。 这种方法与重复地评估前向模型（例如，压缩感测或平行成像正向模型）的常规重建方法相反。

公开(公告)号：US20070282194A1

公开(公告)日：2007-12-06

申请号：US11839094

申请日：2007-08-15

申请人： Graham Wiggins ,  Lawrence Wald

发明人： Graham Wiggins ,  Lawrence Wald

IPC分类号： A61B5/05

CPC分类号： A61B5/055 ,  G01R33/288 ,  G01R33/34007 ,  G01R33/34084 ,  G01R33/3415 ,  G01R33/3607 ,  G01R33/365 ,  G01R33/5611 ,  G01R33/5659

摘要： A multi-element MRI head coil is formed in the shape of a helmet that fits over the head of a subject to be imaged. The coil elements are separately driven by rf transmit channels during an MR scan to shape the rf fields produced in the region of interest. The head coil can be used in the transmit only phase of the scan, or it can be used in both the transmit and receive phases.

摘要翻译： 多元素MRI头部线圈形成为头盔的形状，该头盔适合于要被成像的对象的头部。 在MR扫描期间，线圈元件由rf发射通道单独驱动，以形成在感兴趣区域中产生的射频场。 磁头线圈可用于扫描的发射阶段，也可用于发射和接收阶段。

公开(公告)号：US10126397B2

公开(公告)日：2018-11-13

申请号：US14707598

申请日：2015-05-08

申请人： Stephen Cauley ,  Berkin Bilgic ,  Kawin Setsompop ,  Lawrence Wald

发明人： Stephen Cauley ,  Berkin Bilgic ,  Kawin Setsompop ,  Lawrence Wald

IPC分类号： G01R33/56 ,  G01R33/561 ,  G01R33/385 ,  G01R33/567

摘要： Systems and methods for reconstructing images using a hierarchically semiseparable (“HSS”) solver to compactly represent the inverse encoding matrix used in the reconstruction are provided. The reconstruction method includes solving for the actual inverse of the encoding matrix using a direct (i.e., non-iterative) HSS solver. This approach is contrary to conventional reconstruction methods that repetitively evaluate forward models (e.g., compressed sensing or parallel imaging forward models).

公开(公告)号：US09594141B2

公开(公告)日：2017-03-14

申请号：US13633908

申请日：2012-10-03

申请人： Daniel Weller ,  Leo Grady ,  Lawrence Wald ,  Vivek K Goyal

发明人： Daniel Weller ,  Leo Grady ,  Lawrence Wald ,  Vivek K Goyal

IPC分类号： G01R33/341 ,  G01R33/58 ,  G01R33/561

CPC分类号： G01R33/5611

摘要： An MR imaging system uses multiple RF coils for acquiring corresponding multiple image data sets of a slice or volume of patient anatomy. An image data processor comprises at least one processing device conditioned for, deriving a first set of weights for weighted combination of k-space data of the multiple image data sets for generating a calibration data set comprising a subset of k-space data of composite image data representing the multiple image data sets. The image data processor uses the calibration data set in generating a first MR image data set, deriving the parameters of a probability distribution in response to the first set of weights and the first MR image data set and deriving a second set of weights and second MR image data set together using the probability distribution.

摘要翻译： MR成像系统使用多个RF线圈来获取患者解剖结构的切片或体积的相应的多个图像数据集。 图像数据处理器包括至少一个处理装置，该处理装置被调节为：为多个图像数据集的k空间数据的加权组合推导第一组加权，以产生包括合成图像的k空间数据子集的校准数据集 表示多个图像数据集的数据。 图像数据处理器使用校准数据集来生成第一MR图像数据集，响应于第一组权重和第一MR图像数据集导出概率分布的参数并导出第二组权重和第二MR 使用概率分布将图像数据集合在一起。

公开(公告)号：US20130207652A1

公开(公告)日：2013-08-15

申请号：US13633908

申请日：2012-10-03

申请人： Daniel Weller ,  Leo Grady ,  Lawrence Wald ,  Vivek K. Goyal

发明人： Daniel Weller ,  Leo Grady ,  Lawrence Wald ,  Vivek K. Goyal

IPC分类号： G01R33/341 ,  G01R33/58

CPC分类号： G01R33/5611

摘要： An MR imaging system uses multiple RF coils for acquiring corresponding multiple image data sets of a slice or volume of patient anatomy. An image data processor comprises at least one processing device conditioned for, deriving a first set of weights for weighted combination of k-space data of the multiple image data sets for generating a calibration data set comprising a subset of k-space data of composite image data representing the multiple image data sets. The image data processor uses the calibration data set in generating a first MR image data set, deriving the parameters of a probability distribution in response to the first set of weights and the first MR image data set and deriving a second set of weights and second MR image data set together using the probability distribution.

摘要翻译： MR成像系统使用多个RF线圈来获取患者解剖结构的切片或体积的相应的多个图像数据集。 图像数据处理器包括至少一个处理装置，该处理装置被调节为：为多个图像数据集的k空间数据的加权组合推导第一组加权，以产生包括合成图像的k空间数据子集的校准数据集 表示多个图像数据集的数据。 图像数据处理器使用校准数据集来生成第一MR图像数据集，响应于第一组权重和第一MR图像数据集导出概率分布的参数并导出第二组权重和第二MR 使用概率分布将图像数据集合在一起。

公开(公告)号：US20130015854A1

公开(公告)日：2013-01-17

申请号：US13181868

申请日：2011-07-13

申请人： Elfar Adalsteinsson ,  Hans-Peter Fautz ,  Kawin Setsompop ,  Lawrence Wald

发明人： Elfar Adalsteinsson ,  Hans-Peter Fautz ,  Kawin Setsompop ,  Lawrence Wald

IPC分类号： G01R33/44

CPC分类号： G01R33/56563 ,  G01R33/446 ,  G01R33/5607 ,  G01R33/5612 ,  G01R33/5614

摘要： In a magnetic resonance apparatus and operating method therefor, and in a processor that is programmed to design RF pulses for operating such a magnetic resonance apparatus, the RF pulses are designed to mitigate off-resonance effects caused by inhomogeneity of the basic (B0) magnetic field in the magnetic resonance apparatus. The RF pulses of a parallel transmit array are designed with different spatial phase distributions, that deviate from a constant phase from pulse-to-pulse, with the absolute value of the difference between respective spatial phase distributions of any two successively radiated RF pulses corresponding to the off-resonance that is caused by B0-inhomogeneity during the time between the radiation of the successive pulses. Additionally, or separately, currents supplied to the shim coils can be taken into account in the design of the RF pulses as an additional degree of freedom, with the shimming of the basic magnetic field produced by the shim currents deviating from shim currents designed to ideally produce a homogenous B0 field.

摘要翻译： 在一种磁共振装置及其操作方法中，并且在被编程为设计用于操作这种磁共振装置的RF脉冲的处理器中，RF脉冲被设计成减轻由基本（B0）磁性的不均匀性引起的非共振效应 磁场。 平行发射阵列的RF脉冲被设计为具有不同的空间相位分布，其偏离了脉冲到脉冲的恒定相位，对应于任何两个相继辐射的RF脉冲的相应空间相位分布之间的差的绝对值 在连续脉冲的辐射期间由B0不均匀性引起的非共振。 此外，或者单独地，作为附加自由度，在RF脉冲的设计中可以考虑提供给垫片线圈的电流，同时由偏置电流产生的基本磁场的匀场偏离设计成理想的电流 产生均匀的B0场。

公开(公告)号：US10197646B2

公开(公告)日：2019-02-05

申请号：US14705576

申请日：2015-05-06

申请人： Elfar Adalsteinsson ,  Luca Daniel ,  Bastien Guerin ,  Boris Keil ,  Zohaib Mahmood ,  Markus Vester ,  Lawrence Wald

发明人： Elfar Adalsteinsson ,  Luca Daniel ,  Bastien Guerin ,  Boris Keil ,  Zohaib Mahmood ,  Markus Vester ,  Lawrence Wald

IPC分类号： G01R33/36 ,  G01R33/34 ,  G01R33/385 ,  G01R33/561 ,  G01R33/3415

摘要： A magnetic resonance imaging (MRI) system includes a plurality of transmitters to generate a parallel transmission radio frequency (RF) pulse, an array of coils coupled to the plurality of transmitters to apply the parallel transmission RF pulse to a subject, and a decoupling system connected to the plurality of transmitters and the array of coils. The decoupling system includes a plurality of hybrid couplers, each hybrid coupler of the plurality of hybrid couplers being coupled to a respective pair of the plurality of transmitters and to a respective pair of the array of coils. The plurality of hybrid couplers are configured to diagonalize an impedance matrix of the plurality of coils.