公开(公告)号：US20110241679A1

公开(公告)日：2011-10-06

申请号：US13076763

申请日：2011-03-31

申请人： Thorsten Feiweier ,  Tony Hyun Kim ,  David Andrew Porter

发明人： Thorsten Feiweier ,  Tony Hyun Kim ,  David Andrew Porter

IPC分类号： G01R33/48

CPC分类号： G01R33/56341 ,  G01R33/4835 ,  G01R33/56518

摘要： In a method and apparatus to reduce distortions in diffusion imaging, at least one first measurement is implemented with a first diffusion weighting for a number of slices that are spatially separated from one another and at least one second measurement is implemented with a second diffusion weighting for the number of slices that are spatially separated from one another. A deskewing function is determined as are correction parameters to deskew diffusion-weighted magnetic resonance images on the basis of the measurements, so that image information and/or correction parameters of different slices are linked with one another. The diffusion-weighted magnetic resonance images are distortion-corrected on the basis of the deskewing function and the correction parameters.

摘要翻译： 在减少扩散成像中的失真的方法和装置中，通过第一扩散加权来实现至少一个第一测量，所述第一扩散加权用于彼此空间上分离的多个片段，并且至少一个第二测量用第二扩散加权来实现， 在空间上彼此分离的切片的数量。 基于测量，确定去偏移功能，作为对偏移扩散加权磁共振图像的校正参数，使得不同切片的图像信息和/或校正参数相互链接。 扩散加权磁共振图像基于去偏置函数和校正参数进行失真校正。

公开(公告)号：US20110187367A1

公开(公告)日：2011-08-04

申请号：US13020302

申请日：2011-02-03

申请人： Thorsten Feiweier ,  Stefan Huwer ,  Tony Hyun Kim ,  David Andrew Porter ,  Thorsten Speckner

发明人： Thorsten Feiweier ,  Stefan Huwer ,  Tony Hyun Kim ,  David Andrew Porter ,  Thorsten Speckner

IPC分类号： G01R33/44

CPC分类号： G01R33/44

摘要： In a method and magnetic resonance apparatus to reduce distortions in magnetic resonance diffusion imaging, a magnetic resonance data acquisition system is operated to acquire magnetic resonance data in a first measurement with a first diffusion weighting, and to acquire magnetic resonance data in a second measurement with a second, different diffusion weighting. A non-linear, system-specific distortion-correcting function is determined on the basis of system-specific information that is specific to said magnetic resonance data acquisition system. Correction parameters are calculated to correct distortions in subsequently-acquired diffusion-weighted magnetic resonance images, based on the data acquired in the first and second measurements with the system-specific distortion-correcting function applied thereto. The subsequently-acquired diffusion-weighted magnetic resonance images are corrected using the correction parameters to at least reduce distortions therein.

摘要翻译： 在减小磁共振扩散成像中的失真的方法和磁共振装置中，磁共振数据采集系统被操作以在具有第一扩散加权的第一测量中采集磁共振数据，并且在第二测量中采集磁共振数据， 第二个不同的扩散加权。 基于特定于所述磁共振数据采集系统的系统特定信息来确定非线性系统特定的失真校正功能。 基于在第一和第二测量中采集的数据与应用于其的系统特定的失真校正功能，计算校正参数以校正随后获取的扩散加权磁共振图像中的失真。 使用校正参数来校正后续获取的扩散加权磁共振图像，以至少减少其中的失真。

公开(公告)号：US08508226B2

公开(公告)日：2013-08-13

申请号：US13020302

申请日：2011-02-03

申请人： Thorsten Feiweier ,  Stefan Huwer ,  Tony Hyun Kim ,  David Andrew Porter ,  Thorsten Speckner

发明人： Thorsten Feiweier ,  Stefan Huwer ,  Tony Hyun Kim ,  David Andrew Porter ,  Thorsten Speckner

IPC分类号： G01V3/00

CPC分类号： G01R33/44

摘要： In a method and magnetic resonance apparatus to reduce distortions in magnetic resonance diffusion imaging, a magnetic resonance data acquisition system is operated to acquire magnetic resonance data in a first measurement with a first diffusion weighting, and to acquire magnetic resonance data in a second measurement with a second, different diffusion weighting. A non-linear, system-specific distortion-correcting function is determined on the basis of system-specific information that is specific to said magnetic resonance data acquisition system. Correction parameters are calculated to correct distortions in subsequently-acquired diffusion-weighted magnetic resonance images, based on the data acquired in the first and second measurements with the system-specific distortion-correcting function applied thereto. The subsequently-acquired diffusion-weighted magnetic resonance images are corrected using the correction parameters to at least reduce distortions therein.

摘要翻译： 在减小磁共振扩散成像中的失真的方法和磁共振装置中，磁共振数据采集系统被操作以在具有第一扩散加权的第一测量中采集磁共振数据，并且在第二测量中采集磁共振数据， 第二个不同的扩散加权。 基于特定于所述磁共振数据采集系统的系统特定信息来确定非线性系统特定的失真校正功能。 基于在第一和第二测量中采集的数据与应用于其的系统特定的失真校正功能，计算校正参数以校正随后获取的扩散加权磁共振图像中的失真。 使用校正参数来校正后续获取的扩散加权磁共振图像，以至少减少其中的失真。

公开(公告)号：US08487617B2

公开(公告)日：2013-07-16

申请号：US13076763

申请日：2011-03-31

申请人： Thorsten Feiweier ,  Tony Hyun Kim ,  David Andrew Porter

发明人： Thorsten Feiweier ,  Tony Hyun Kim ,  David Andrew Porter

IPC分类号： G01V3/00

CPC分类号： G01R33/56341 ,  G01R33/4835 ,  G01R33/56518

摘要： In a method and apparatus to reduce distortions in diffusion imaging, at least one first measurement is implemented with a first diffusion weighting for a number of slices that are spatially separated from one another and at least one second measurement is implemented with a second diffusion weighting for the number of slices that are spatially separated from one another. A deskewing function is determined as are correction parameters to deskew diffusion-weighted magnetic resonance images on the basis of the measurements, so that image information and/or correction parameters of different slices are linked with one another. The diffusion-weighted magnetic resonance images are distortion-corrected on the basis of the deskewing function and the correction parameters.

摘要翻译： 在减少扩散成像中的失真的方法和装置中，通过第一扩散加权来实现至少一个第一测量，所述第一扩散加权用于彼此空间上分离的多个片段，并且至少一个第二测量用第二扩散加权来实现， 在空间上彼此分离的切片的数量。 基于测量，确定去偏移功能，作为对偏移扩散加权磁共振图像的校正参数，使得不同切片的图像信息和/或校正参数相互链接。 扩散加权磁共振图像基于去偏置函数和校正参数进行失真校正。

公开(公告)号：US20130221965A1

公开(公告)日：2013-08-29

申请号：US13781199

申请日：2013-02-28

申请人： Jürgen Nistler ,  David Andrew Porter ,  Thorsten Speckner ,  Christian Wünsch

发明人： Jürgen Nistler ,  David Andrew Porter ,  Thorsten Speckner ,  Christian Wünsch

IPC分类号： G01R33/58

CPC分类号： G01R33/586 ,  G01R33/36 ,  G01R33/5659

摘要： A B1 magnetic field may be regulated during a magnetic resonance tomography (MRT) imaging sequence.

摘要翻译： 可以在磁共振断层摄影（MRT）成像序列期间调节B1磁场。

公开(公告)号：US20130033262A1

公开(公告)日：2013-02-07

申请号：US13554268

申请日：2012-07-20

申请人： David Andrew Porter

发明人： David Andrew Porter

IPC分类号： G01R33/44

CPC分类号： A61B5/4064 ,  A61B5/055 ,  G01R33/5602 ,  G01R33/5616 ,  G01R33/56341 ,  G01R33/5676

摘要： In a method described for generating magnetic resonance exposures in which diffusion-coded raw data are acquired with of a diffusion gradient measurement sequence having a number of partial diffusion gradient sequences, at least one diffusion coding gradient pulse is emitted in each partial data set, and raw data of a k-space region are acquired during a first echo after a defined first echo time the k-space regions in total covering a complete k-space. Raw data of an established navigator k-space region are acquired during a second echo after a second echo time the navigator k-space region being identical for different partial diffusion gradient sequences. Reference raw data are acquired by a reference measurement sequence with multiple partial reference sequences.

摘要翻译： 在用于产生磁共振曝光的方法中，其中利用具有多个部分扩散梯度序列的扩散梯度测量序列获取扩散编码的原始数据，在每个部分数据集中发射至少一个扩散编码梯度脉冲， 在定义的第一回波时间之后的第一回波期间，在总共覆盖整个k空间的k空间区域中获取k空间区域的原始数据。 导航器k空间区域对于不同的部分扩散梯度序列是相同的，在第二回波时间之后的第二回波期间获取已建立的导航器k空间区域的原始数据。 通过具有多个部分参考序列的参考测量序列来获取参考原始数据。

公开(公告)号：US09250307B2

公开(公告)日：2016-02-02

申请号：US13439050

申请日：2012-04-04

申请人： Stefan Huwer ,  David Andrew Porter

发明人： Stefan Huwer ,  David Andrew Porter

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01R33/563 ,  G01R33/565 ,  G06T5/50

CPC分类号： G01R33/56341 ,  G01R33/56509 ,  G01R33/56536 ,  G06T5/50 ,  G06T2207/10088 ,  G06T2207/30008 ,  G06T2207/30016

摘要： In a magnetic resonance (MR) method and system for the generation of diffusion information, diffusion-weighted MR images of an examination subject are generated, each image being generated using an individual diffusion gradient. The diffusion gradients, and therefore the MR images, are sorted such that, after the sorting, a predefined number of diffusion gradients respectively forms a group. Each diffusion gradient belongs to at least one of these groups, and the diffusion gradients of the respective same group are all as linearly independent of one another as possible. The MR images whose diffusion gradients form a group are assembled into an MR result image. Spatial transformations between the MR result images are determined, and the MR images are modified using these spatial transformations. The diffusion information is formed with the aid of the modified MR images.

摘要翻译： 在用于产生扩散信息的磁共振（MR）方法和系统中，生成检查对象的扩散加权MR图像，每个图像使用单独的扩散梯度来生成。 扩散梯度，因此MR图像被分类，使得在分选之后，预定数量的扩散梯度分别形成一组。 每个扩散梯度属于这些组中的至​​少一个，并且相应组的扩散梯度尽可能地彼此线性地相互独立。 其扩散梯度形成组的MR图像被组装成MR结果图像​​。 确定MR结果图像​​之间的空间变换，并使用这些空间变换修改MR图像。 扩散信息借助于改进的MR图像形成。

公开(公告)号：US08760163B2

公开(公告)日：2014-06-24

申请号：US13104194

申请日：2011-05-10

申请人： Robert Frost ,  Peter Jezzard ,  Karla Miller ,  David Andrew Porter

发明人： Robert Frost ,  Peter Jezzard ,  Karla Miller ,  David Andrew Porter

IPC分类号： G01V3/00

CPC分类号： G01R33/56341 ,  G01R33/56536 ,  G01R33/5676

摘要： In a magnetic resonance apparatus and operating method therefore, 3D navigator data are acquired and are used to correct spatially varying phase errors in contemporaneously acquired imaging data in each shot of a multi-shot data acquisition sequence. A mosaic sampling scheme is used to enter the diffusion-weighted magnetic resonance data and the navigator data into k-space respectively in blocks that each form a subset of the entirety of k-space. The navigator data in each shot are entered into a block that is located at the center of k-space, and, in each shot, the corresponding image data are entered into an offset block in k-space, that is offset in at least one spatial direction from the navigator data block. The offset is varied from shot-to-shot.

摘要翻译： 因此，在磁共振装置和操作方法中，获取3D导航仪数据，并用于校正多次拍摄数据采集序列的每次拍摄中同时获取的成像数据中的空间变化相位误差。 马赛克采样方案用于分别以每个形成整个k空间的子集的块将漫射加权磁共振数据和导航器数据输入k空间。 每个镜头中的导航器数据被输入到位于k空间中心的块中，并且在每个镜头中，相应的图像数据被输入到k空间中的偏移块中，其在至少一个 导航器数据块的空间方向。 偏移量从射击到射击不同。

公开(公告)号：US20120286777A1

公开(公告)日：2012-11-15

申请号：US13104194

申请日：2011-05-10

申请人： Robert Frost ,  Peter Jezzard ,  Karla Miller ,  David Andrew Porter

发明人： Robert Frost ,  Peter Jezzard ,  Karla Miller ,  David Andrew Porter

IPC分类号： G01R33/44

CPC分类号： G01R33/56341 ,  G01R33/56536 ,  G01R33/5676

摘要： In a magnetic resonance apparatus and operating method therefore, 3D navigator data are acquired and are used to correct spatially varying phase errors in contemporaneously acquired imaging data in each shot of a multi-shot data acquisition sequence. A mosaic sampling scheme is used to enter the diffusion-weighted magnetic resonance data and the navigator data into k-space respectively in blocks that each form a subset of the entirety of k-space. The navigator data in each shot are entered into a block that is located at the center of k-space, and, in each shot, the corresponding image data are entered into an offset block in k-space, that is offset in at least one spatial direction from the navigator data block. The offset is varied from shot-to-shot.

摘要翻译： 因此，在磁共振装置和操作方法中，获取3D导航仪数据，并用于校正多次拍摄数据采集序列的每次拍摄中同时获取的成像数据中的空间变化相位误差。 马赛克采样方案用于分别以每个形成整个k空间的子集的块将漫射加权磁共振数据和导航器数据输入k空间。 每个镜头中的导航器数据被输入到位于k空间中心的块中，并且在每个镜头中，相应的图像数据被输入到k空间中的偏移块中，其在至少一个 导航器数据块的空间方向。 偏移量从射击到射击不同。

公开(公告)号：US20120025825A1

公开(公告)日：2012-02-02

申请号：US13196135

申请日：2011-08-02

申请人： David Andrew Porter

发明人： David Andrew Porter

IPC分类号： G01R33/48 ,  G01R33/36

CPC分类号： G01R33/5617 ,  G01R33/4836 ,  G01R33/56341 ,  G01R33/565

摘要： In a method and magnetic resonance (MR) apparatus to acquire spin echo-based MR signals of an examination subject with a multi-spin echo sequence with multiple refocusing pulses after a single excitation pulse in an MR system that has a multichannel RF transmission and reception module: detect a spatial, two-dimensional phase distribution in the examination subject is detected by acquiring navigator signals, a phase and amplitude distribution for the individual transmission channels of the RF transmission and reception module is calculated to generate a magnetic field B1 for one of the RF refocusing pulses to generate the spin echo-based MR signal under consideration of the spatial phase distribution of the navigator signals, and this RF refocusing pulse is radiated via the multichannel RF transmission and reception module with the calculated phase and amplitude distributions of the individual transmission channels.

摘要翻译： 在具有多通道RF发射和接收的MR系统中的单个激励脉冲之后，利用具有多个重聚焦脉冲的多自旋回波序列获取检查对象的基于自旋回波的MR信号的方法和磁共振（MR）装置中 模块：通过获取导航信号检测检查对象中的空间二维相位分布，计算RF发送和接收模块的各个传输信道的相位和幅度分布，以产生一个磁场B1 RF再聚焦脉冲，以在考虑导航信号的空间相位分布的情况下产生基于自旋回波的MR信号，并且该RF重聚焦脉冲经由多通道RF发射和接收模块以所计算的个体的相位和幅度分布被辐射 传输通道。