公开(公告)号：US20130257426A1

公开(公告)日：2013-10-03

申请号：US13853865

申请日：2013-03-29

申请人： Thorsten Feiweier ,  Thorsten Speckner

发明人： Thorsten Feiweier ,  Thorsten Speckner

IPC分类号： G01R33/54

CPC分类号： G01R33/54 ,  G01R33/32 ,  G01R33/5612

摘要： A method for activating a magnetic resonance system having a transmit antenna arrangement is provided. The transmit antenna arrangement includes a plurality of independent high-frequency transmit channels with a respectively assigned transmit antenna. Each high-frequency transmit channel has a controllable oscillator. The individual high-frequency transmit channels are activated with independent transmit pulses, and a frequency of the controllable oscillators is controlled independently. At least two of the controllable oscillators therefore oscillate in different frequencies.

摘要翻译： 提供一种用于激活具有发射天线装置的磁共振系统的方法。 发射天线布置包括具有分配的发射天线的多个独立的高频发射信道。 每个高频发射信道具有可控振荡器。 单独的高频发射信道由独立的发射脉冲激活，可控振荡器的频率被独立地控制。 因此，至少两个可控振荡器以不同的频率振荡。

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：US08503752B2

公开(公告)日：2013-08-06

申请号：US12904312

申请日：2010-10-14

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G06K9/00

CPC分类号： G01R33/56341 ,  G01R33/5616 ,  G01R33/56518 ,  G01R33/56554

摘要： In a method and magnetic resonance apparatus for correction of image distortions that occur in acquisition of diffusion-weighted magnetic resonance images of an examination subject, a reference image is acquired without diffusion weighting, a first diffusion-weighted image is acquired for a diffusion direction, a second diffusion-weighted image is acquired for the same diffusion direction, with a different diffusion weighting or a different diffusion gradient polarity than the first diffusion-weighted image. The first diffusion-weighted image is deskewed with a first set of deskewing parameters, and the second diffusion-weighted image is deskewed with a second set of deskewing parameters. The deskewing parameters are correlated and determined by simultaneous minimization of differences between the deskewed first image and the reference image and differentiation between the deskewed second image and the reference image.

摘要翻译： 在用于校正在检测对象的扩散加权磁共振图像的获取中发生的图像失真的方法和磁共振装置中，获取参考图像而不进行扩散加权，获得扩散方向的第一扩散加权图像， 对于与第一扩散加权图像不同的扩散加权或不同的扩散梯度极性，对于相同的扩散方向获取第二扩散加权图像。 将第一扩散加权图像与第一组去偏移参数进行偏斜校正，并且将第二扩散加权图像与第二组去偏置参数进行偏斜校正。 通过同时最小化偏斜校正的第一图像和参考图像之间的差异以及偏斜校正的第二图像和参考图像之间的差异来相关并确定偏斜校正参数。

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：US20130057280A1

公开(公告)日：2013-03-07

申请号：US13602686

申请日：2012-09-04

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/54 ,  G01R33/32

CPC分类号： G01R33/4835 ,  G01R33/565

摘要： In a method for rephasing a first spin system in a first slice with a first coherence curve and a second spin system of a second slice with a second coherence curve, in the generation of MR images with slice multiplexing, a first RF pulse deflects the spin system of the first slice and a second RF pulse deflects the spin system of the second slice. The beginning of the second RF pulse is time-shifted with respect to the beginning of the first RF pulse by a time period that is shorter than the duration of the first RF pulse. A rephasing correction impresses a correction phase on at least one of the spin systems, and signals of the spin systems are respectively detected. The coherence curves are rephased so detection of the signals occurs simultaneously.

摘要翻译： 在用第一相干曲线重建第一切片中的第一旋转系统和具有第二相干曲线的第二切片的第二旋转系统的方法中，在利用切片复用产生MR图像时，第一RF脉冲偏转旋转 第一片的系统和第二RF脉冲偏转第二片的旋转系统。 第二RF脉冲的开始相对于第一RF脉冲的开始被时移到比第一RF脉冲的持续时间短的时间段。 重新定位校正对至少一个自旋系统施加了校正阶段，分别检测了自旋系统的信号。 相干曲线被重新定位，因此信号的检测同时发生。

公开(公告)号：US08283925B2

公开(公告)日：2012-10-09

申请号：US12650757

申请日：2009-12-31

申请人： Karin Auslender ,  Thorsten Feiweier ,  Stefan Huwer

发明人： Karin Auslender ,  Thorsten Feiweier ,  Stefan Huwer

IPC分类号： G01V3/00

CPC分类号： G01R33/56341 ,  A61B5/055 ,  A61B5/7207 ,  G01R33/56518

摘要： In a method and magnetic resonance (MR) system for correction of image distortions that occur in acquisitions of diffusion-weighted MR images of an examination subject a first adjustment measurement with a first diffusion weighting is implemented, a second adjustment measurement with a second diffusion weighting is implemented and correction parameters to de-skew diffusion-weighted MR images are automatically calculated in a computer on the basis of the two adjustment measurements. One of the two adjustment measurements is implemented with a predetermined diffusion weighting in three orthogonal diffusion directions, and correction parameters are determined for the three orthogonal diffusion directions.

摘要翻译： 在用于校正在检查对象的扩散加权MR图像的采集中发生的图像失真的方法和磁共振（MR）系统中，实现具有第一扩散加权的第一调整测量，具有第二扩散加权的第二调整测量 并且基于两个调整测量在计算机中自动计算用于去偏斜扩散加权的MR图像的校正参数。 两个调整测量中的一个在三个正交扩散方向上以预定的扩散加权来实现，并且为三个正交扩散方向确定校正参数。

公开(公告)号：US07960971B2

公开(公告)日：2011-06-14

申请号：US12358546

申请日：2009-01-23

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  G01R33/246 ,  G01R33/5612 ,  G01R33/5659 ,  G01R33/583

摘要： In a method for determination of flip angle distributions for various antenna transmission configurations in a magnetic resonance system, magnetic resonance measurements are implemented with the various transmission configurations, with the reception configuration being identical for all implemented magnetic resonance measurements, and all magnetic resonance measurements for the various transmission configurations are implemented with a specific pulse sequence. This pulse sequence is selected such that the total function that describes the dependency of the image signal at a specific location on the flip angle achieved at this location with the radiated radio-frequency field, as well as on further MR-relevant parameters, can be factored into a first sub-function that describes the dependency of the image signal on the achieved flip angle and a second sub-function (Tb) that describes the dependency of the image signal on the further MR-relevant parameters, and such that the functional dependency of the image signal on the achieved flip angle is known. The absolute flip angle distribution is measured for a reference transmission configuration, and the flip angle distributions of the other transmission configurations are then respectively determined on the basis of the absolute flip angle distribution of the reference transmission configuration and on the basis of the ratio of the spatially-dependent image signals of the magnetic resonance measurements of the respective transmission configuration to the corresponding spatially-dependent image signals of the magnetic resonance measurement of the reference transmission configuration.

摘要翻译： 在用于确定磁共振系统中的各种天线传输配置的翻转角分布的方法中，使用各种传输配置来实现磁共振测量，其中接收配置对于所有实现的磁共振测量是相同的，并且对于 以特定脉冲序列实现各种传输配置。 选择该脉冲序列，使得描述在具有辐射射频场的该位置处实现的翻转角上的特定位置处的图像信号的依赖性的总函数以及另外的MR相关参数可以是 考虑到描述图像信号对实现的翻转角的依赖性的第一子功能和描述图像信号对另外的MR相关参数的依赖性的第二子功能（Tb），并且使得功能 已知图像信号对实现的翻转角的依赖性。 对于参考传输配置来测量绝对翻转角分布，然后分别基于参考传输配置的绝对翻转角分布来确定其他传输配置的翻转角分布，并且基于 相应的传输配置的磁共振测量的空间相关图像信号与参考传输配置的磁共振测量的对应的空间相关图像信号。

公开(公告)号：US20110043204A1

公开(公告)日：2011-02-24

申请号：US12859461

申请日：2010-08-19

申请人： Wolfgang Bielmeier ,  Gerhard Brinker ,  Swen Campagna ,  Thorsten Feiweier ,  Bernd Kuehn ,  Mathias Nittka ,  Carsten Prinz ,  Thorsten Speckner

发明人： Wolfgang Bielmeier ,  Gerhard Brinker ,  Swen Campagna ,  Thorsten Feiweier ,  Bernd Kuehn ,  Mathias Nittka ,  Carsten Prinz ,  Thorsten Speckner

IPC分类号： G01R33/44

CPC分类号： G01R33/546 ,  G01R33/543

摘要： In a magnetic resonance system according to a measurement protocol defined in advance and comprising multiple acquisition parameters, wherein given a non-compliance with at least one limit value (which is automatically established before the beginning of a subject-specific measurement data acquisition)—in particular a SAR limit value and/or a magneto-stimulation limit value and/or a hardware limit value—by the measurement protocol, an adaptation of at least one acquisition parameter ensues using at least one (in particular user-defined) protocol-specific rule for compliance with the limit value, and the measurement data acquisition ensues automatically according to the adapted acquisition parameters.

摘要翻译： 在根据预先定义并包括多个采集参数的测量协议的磁共振系统中，其中给定不符合至少一个限制值（其在对象特异性测量数据获取开始之前自动建立） - 在 特别是SAR限制值和/或磁刺激极限值和/或硬件限制值 - 通过测量协议，使用至少一个（特别是用户定义的）协议特定的随机序列来调整至少一个采集参数 根据适应的采集参数自动进行测量数据采集。

公开(公告)号：US20100171498A1

公开(公告)日：2010-07-08

申请号：US12650757

申请日：2009-12-31

申请人： Karin Auslender ,  Thorsten Feiweier ,  Stefan Huwer

发明人： Karin Auslender ,  Thorsten Feiweier ,  Stefan Huwer

IPC分类号： G01R33/48 ,  G06K9/00

CPC分类号： G01R33/56341 ,  A61B5/055 ,  A61B5/7207 ,  G01R33/56518

摘要： In a method and magnetic resonance (MR) system for correction of image distortions that occur in acquisitions of diffusion-weighted MR images of an examination subject a first adjustment measurement with a first diffusion weighting is implemented, a second adjustment measurement with a second diffusion weighting is implemented and correction parameters to de-skew diffusion-weighted MR images are automatically calculated in a computer on the basis of the two adjustment measurements. One of the two adjustment measurements is implemented with a predetermined diffusion weighting in three orthogonal diffusion directions, and correction parameters are determined for the three orthogonal diffusion directions.

摘要翻译： 在用于校正在检查对象的扩散加权MR图像的采集中发生的图像失真的方法和磁共振（MR）系统中，实现具有第一扩散加权的第一调整测量，具有第二扩散加权的第二调整测量 并且基于两个调整测量在计算机中自动计算用于去偏斜扩散加权的MR图像的校正参数。 两个调整测量中的一个在三个正交扩散方向上以预定的扩散加权来实现，并且为三个正交扩散方向确定校正参数。

公开(公告)号：US07634303B2

公开(公告)日：2009-12-15

申请号：US11768531

申请日：2007-06-26

申请人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jürgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schön

发明人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jürgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schön

IPC分类号： A61B5/05 ,  G01V3/00 ,  B23P17/04

CPC分类号： G01R33/28 ,  G01R33/34 ,  G01R33/5659 ,  Y10T29/49

摘要： A dielectric element is formed of a dielectric material exhibiting a magnetic resonance relaxation time, with a relaxation agent incorporated in the dielectric material that reduces the relaxation time of the dielectric material. The dielectric element is adapted for placement on a subject while magnetic resonance data are acquired from the subject, and locally influences the B1 field distribution in the subject during the acquisition of magnetic resonance data.

摘要翻译： 电介质元件由表现出磁共振弛豫时间的电介质材料形成，并且电介质材料中包含减轻电介质材料弛豫时间的松弛剂。 介电元件适于放置在被摄体上，同时从受检者获取磁共振数据，并且在获取磁共振数据期间局部影响对象中的B1场分布。