公开(公告)号：US20050083054A1

公开(公告)日：2005-04-21

申请号：US10921583

申请日：2004-08-19

申请人： Thorsten Feiweier ,  Franz Hebrank

发明人： Thorsten Feiweier ,  Franz Hebrank

IPC分类号： G01R33/565 ,  G01V3/00 ,  G06K9/00

CPC分类号： G01R33/5659

摘要： In a method and magnetic resonance apparatus for compensation of contrast inhomogeneities in magnetic resonance images caused by spatial distributions of the radio frequency field associated with the radio frequency pulses that are emitted in order to acquire magnetic resonance (MR) data, multiple individual MR images of a particular region of a subject are recorded with different radio frequency pulse sequences leading to different flip angles. A common contrast-homogenized image for the affected region then is generated based on the different individual images, so that within the contrast-homogenized image, intensity variations due to a distribution of the flip angle are smaller than in the individual images, at least in some areas.

摘要翻译： 在一种方法和磁共振装置中，用于补偿与为了获得磁共振（MR）数据而发射的射频脉冲相关联的射频场的空间分布引起的磁共振图像中的对比度不均匀性， 用不同的射频脉冲序列记录被摄体的特定区域，导致不同的翻转角度。 然后基于不同的单独图像生成受影响区域的常见对比均匀化图像，使得在对比均匀化图像内，由于翻转角分布引起的强度变化小于各个图像中的强度变化，至少在 一些地区。

公开(公告)号：US09651644B2

公开(公告)日：2017-05-16

申请号：US13848965

申请日：2013-03-22

申请人： Thorsten Feiweier ,  Christof Krellmann ,  Bernd Kuehn ,  Dominik Paul ,  Josef Pfeuffer ,  Elisabeth Preusche ,  Katrin Wohlfarth

发明人： Thorsten Feiweier ,  Christof Krellmann ,  Bernd Kuehn ,  Dominik Paul ,  Josef Pfeuffer ,  Elisabeth Preusche ,  Katrin Wohlfarth

IPC分类号： G01V3/00 ,  G01R33/563 ,  G01R33/565 ,  G01R33/483

CPC分类号： G01R33/563 ,  G01R33/4833 ,  G01R33/4838 ,  G01R33/56527

摘要： In a method and a magnetic resonance (MR) system, a marked area is determined that demarcates a predetermined volume segment of the subject relative to the regions adjacent thereto. Nuclei in the predetermined volume segment are excited, or nuclei in a region adjacent thereto are saturated with an RF excitation pulse at the same time a magnetic field gradient is activated. The center frequency of a frequency range of the RF excitation pulse and the direction of the magnetic field gradient are adjusted dependent on resonant frequencies of substances present within the predetermined volume segment in order, starting from the predetermined volume segment to shift an actual excitation volume segment excited by the RF excitation pulse toward the marked area, or to shift a saturation volume saturated by the RF excitation pulse away from the marked area. MR data are then acquired from the predetermined volume segment.

公开(公告)号：US09651640B2

公开(公告)日：2017-05-16

申请号：US13602751

申请日：2012-09-04

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/565 ,  A61B5/055 ,  G01R33/483

CPC分类号： G01R33/4835 ,  A61B5/055 ,  G01R33/565 ,  G01R33/56545 ,  G01R33/56581

摘要： In a magnetic resonance (MR) method system for slice-selective detection and correction of incorrect magnetic resonance data, a first acquisition sequence is implemented to acquire MR data from a first slice of the examination subject that is associated with a chronologically first coherence curve of the magnetization; a second acquisition sequence is implemented to acquire MR data from a second slice of the examination subject that is associated with a chronologically second coherence curve of the magnetization. In slice multiplexing measurement sequences that are characterized by the simultaneous use of the transverse magnetization of the first and second slice within the first and second acquisition sequences slice-selective errors can be detected and corrections made.

公开(公告)号：US09599690B2

公开(公告)日：2017-03-21

申请号：US13602686

申请日：2012-09-04

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/565 ,  G01R33/483

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.

公开(公告)号：US09453896B2

公开(公告)日：2016-09-27

申请号：US13649326

申请日：2012-10-11

申请人： Thorsten Feiweier ,  Bernd Kuehn

发明人： Thorsten Feiweier ,  Bernd Kuehn

IPC分类号： G01R33/56 ,  G01R33/38 ,  G01R33/483

CPC分类号： G01R33/4838 ,  G01R33/5607

摘要： In a method and apparatus for magnetic resonance (MR) imaging, a magnetization of nuclear spins in a subject is prepared in multiple preparation modules of an acquisition sequence. MR signals are acquired with at least one imaging module of the sequence. Spoiler gradient fields are generated in the multiple preparation modules in order to affect a transverse magnetization of the spins. The spoiler gradient fields that are applied in at least two different preparation modules are spatially varied along different directions. Spoiler gradient moments of the spoiler gradient fields are selected so that, for at least one of three orthogonal spatial directions, a weighted sum of the spoiler gradient moments that are applied along this spatial direction satisfies a threshold condition.

摘要翻译： 在用于磁共振（MR）成像的方法和装置中，在采集序列的多个准备模块中制备受试者的核自旋的磁化。 使用该序列的至少一个成像模块来获取MR信号。 扰流器梯度场在多个准备模块中产生，以影响自旋的横向磁化。 应用于至少两个不同准备模块的扰流板梯度场在不同方向上空间变化。 选择扰流板梯度场的扰流器梯度矩，使得对于三个正交空间方向中的至少一个，沿着该空间方向施加的扰流器梯度力矩的加权和满足阈值条件。

公开(公告)号：US09417304B2

公开(公告)日：2016-08-16

申请号：US14043995

申请日：2013-10-02

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/563

CPC分类号： G01R33/54 ,  G01R33/56341

摘要： In the acquisition of MR data with diffusion information nuclear spins in a volume segment are excited with radiation of a diffusion coding module and a subsequent diffusion decoding module, and at least one RF pulse is radiated after the excitation, and the MR data are read out. At least one of a time period that defines a time interval between a point in time at which the spin echo condition is satisfied, and the echo time, a first time interval that defines a minimum time interval between the end of the diffusion coding module and the start of the diffusion decoding module, and a second time interval that defines a minimum time interval between the end of the excitation module, and the start of the diffusion coding module, and a third time interval that defines a minimum time interval between the end of the diffusion coding module and the start of the readout of the MR data, is set.

摘要翻译： 在利用扩散信息获取MR数据时，通过扩散编码模块和随后的扩散解码模块的辐射激发体积段中的核自旋，并且在激发之后辐射至少一个RF脉冲，并且读出MR数据 。 定义满足自旋回波条件的时间点与回波时间之间的时间间隔的时间段中的至少一个定义扩散编码模块的末端与最小时间间隔的第一时间间隔， 扩散解码模块的开始，以及定义激励模块的结束与扩散编码模块的开始之间的最小时间间隔的第二时间间隔，以及定义终端之间的最小时间间隔的第三时间间隔 的扩散编码模块和MR数据的读出的开始。

公开(公告)号：US20140278195A1

公开(公告)日：2014-09-18

申请号：US14208375

申请日：2014-03-13

申请人： Thorsten Feiweier ,  Alto Stemmer

发明人： Thorsten Feiweier ,  Alto Stemmer

IPC分类号： G01M99/00

CPC分类号： G01M99/008 ,  A61B6/586 ,  A61B8/54 ,  G01R33/543 ,  G01R33/561 ,  G06F19/00 ,  G06F19/321 ,  G16H40/63

摘要： In a method for operating a medical imaging system and a medical imaging system operating according to such a method, a measurement sequence is divided into a number of partial sequences, with each of the partial sequences resulting in a loading of at least one of these system components when the measurement sequence is executed. The partial sequences are evaluated, in terms of their number and duration, using a computerized model in order to determine whether a load limit for the at least one of the system components is exceeded. If so, the number or duration of the partial sequences is modified, and a check using the computer model is again implemented. A number or respective duration of the partial sequences that results in the load limit not being exceeded is then used as a final output in order to operate the medical imaging system.

摘要翻译： 在用于操作根据这种方法操作的医学成像系统和医学成像系统的方法中，测量序列被分成多个部分序列，每个部分序列导致这些系统中的至少一个的加载 执行测量序列时的组件。 使用计算机化模型来评估部分序列的数量和持续时间，以便确定是否超过了至少一个系统组件的负载限制。 如果是这样，则部分序列的数量或持续时间被修改，并且再次实现使用计算机模型的检查。 然后将导致不超过负载限制的部分序列的数量或相应持续时间用作最终输出，以便操作医学成像系统。

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：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。