公开(公告)号：US20130063144A1

公开(公告)日：2013-03-14

申请号：US13410551

申请日：2012-03-02

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/56

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

摘要： In a method and system for diffusion-weighted acquisition of MR signals with an image acquisition sequence that has multiple diffusion coding gradients and readout gradients to read out the MR signals, MR signal portions are generated with a desired signal coherence path and MR signal portions are generated with unwanted signal coherence paths, with predominantly the MR signal portions with the desired signal coherence path being acquired by the readout gradients by activating dephasing gradients that reduce the acquisition of MR signal portions with unwanted coherence paths. The dephasing gradients are determined under consideration of the diffusion gradients that are used and under consideration of the unwanted signal coherence paths, so that each has a dephasing gradient moment for each unwanted signal coherence path that is greater than a threshold.

摘要翻译： 在用具有多个扩散编码梯度和读出梯度读出MR信号的图像获取序列对MR信号进行扩散加权采集的方法和系统中，产生具有期望信号相干路径的MR信号部分，并且MR信号部分 由不想要的信号相干路径产生，主要是具有期望信号相干路径的MR信号部分由读出梯度通过激活减少具有不想要的相干路径的MR信号部分的采集的去相位梯度来获取。 在考虑使用和考虑不需要的信号相干路径的扩散梯度下确定去相位梯度，使得每个具有大于阈值的每个不需要的信号相干路径的去相位梯度矩。

公开(公告)号：US20130057281A1

公开(公告)日：2013-03-07

申请号：US13602751

申请日：2012-09-04

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/56 ,  G01R33/34

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.

摘要翻译： 在用于切片选择性检测和不正确磁共振数据的校正的磁共振（MR）方法系统中，实施第一获取序列以从与检查对象的第一切片相关联地获取MR数据，该MR数据与时间顺序的第一相干曲线 磁化强度; 实施第二采集序列以从与磁化的时间顺序的第二相干曲线相关联的检查对象的第二切片获取MR数据。 在片复用测量序列中，其特征在于同时使用第一和第二采样序列中的第一和第二片的横向磁化，可以检测并校正切片选择性误差。

公开(公告)号：US08274283B2

公开(公告)日：2012-09-25

申请号：US12430546

申请日：2009-04-27

申请人： Kecheng Liu ,  YongMing Dai ,  Tiejun Zhao ,  Thorsten Feiweier ,  Jing An

发明人： Kecheng Liu ,  YongMing Dai ,  Tiejun Zhao ,  Thorsten Feiweier ,  Jing An

IPC分类号： G01V3/00

CPC分类号： G01R33/56341

摘要： An apparatus and method for obtaining diffusion weighted magnetic resonance images (DW-MRI) is described. The properties of the diffusion tensor in tissue are measured by applying a diffusion weighting gradient oriented along a plurality of measurement axes. The value of the magnetic field is increased by using as many of the magnetic gradient coils as are effective in contributing the gradient field strength along the axis being. In regions where the magnetic field gradient is increased, the echo time (TE) may be decreased, increasing the signal-to-noise ratio of the measurements. Alternatively, the number of measurements than are averaged to achieve a particular image quality may be decreased, reducing the patient exposure time.

摘要翻译： 描述了用于获得扩散加权磁共振图像（DW-MRI）的装置和方法。 通过施加沿多个测量轴定向的扩散加权梯度来测量组织中的扩散张量的性质。 通过使用有效地贡献沿轴线的梯度场强度的磁化梯度线圈数来增加磁场的值。 在磁场梯度增加的区域中，可以减小回波时间（TE），增加测量的信噪比。 或者，可以减少平均以获得特定图像质量的测量次数，减少患者暴露时间。

公开(公告)号：US20120217966A1

公开(公告)日：2012-08-30

申请号：US13218435

申请日：2011-08-25

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/44

CPC分类号： G01R33/56518

摘要： A method for compensating for eddy current fields in magnetic resonance images acquired using a magnetic resonance apparatus is provided. A global component of the eddy current fields corresponding to a zeroth order and a first order is compensated globally using a change in control parameters of at least one device of the magnetic resonance apparatus that is suitable for compensating for the global components (e.g., a reference oscillator and/or a gradient coil). In order to correct local higher-order eddy current fields in a volume of interest characterized by a prominent point, the residual eddy current fields remaining following compensation of the global component are developed around the point. Correction values for the control parameters are determined from the zeroth- and/or first-order local components of the development and are taken into account in the control of the magnetic resonance apparatus for magnetic resonance image acquisition.

摘要翻译： 提供一种用于补偿使用磁共振装置获得的磁共振图像中的涡流场的方法。 使用适于补偿全局分量的磁共振装置的至少一个装置的控制参数的变化来全局地补偿对应于零级和第一级的涡流场的全局分量（例如，参考 振荡器和/或梯度线圈）。 为了校正以突出点为特征的感兴趣的体积中的局部高阶涡流场，围绕该点开发在补偿全局分量之后剩余的剩余涡流场。 用于控制参数的校正值由显影的第零和/或一阶局部分量确定，并且在用于磁共振图像采集的磁共振装置的控制中被考虑。

公开(公告)号：US08195417B2

公开(公告)日：2012-06-05

申请号：US12219610

申请日：2008-07-24

申请人： Thorsten Feiweier ,  Ralf Ladebeck ,  Diana Martin ,  Hartwig Newiger ,  Josef Pfeuffer ,  Michael Szimtenings ,  Harald Werthner

发明人： Thorsten Feiweier ,  Ralf Ladebeck ,  Diana Martin ,  Hartwig Newiger ,  Josef Pfeuffer ,  Michael Szimtenings ,  Harald Werthner

IPC分类号： G01R35/00

CPC分类号： A61B6/032 ,  A61B5/11 ,  A61B5/7285 ,  A61B6/037 ,  A61B6/5247 ,  A61B6/541 ,  A61B8/00 ,  A61B8/4416 ,  A61B90/36 ,  A61B2090/364 ,  G06F19/00

摘要： Disclosed is a method and apparatus for recording measured data from a patient by taking movements into account by use of a medical device designed both for recording motion-related measured data and for recording nuclear medicine measured data. The method may include recording nuclear medicine measured data by use of the medical device, simultaneously recording motion-related measured data by use of the medical device, determining at least one motion information item relating to at least one movement of the patient and/or at least one movement inside the body of the patient during the ongoing measured data recording by evaluating at least a portion of the previously recorded motion-related measured data, and carrying out motion correction for at least a portion of the nuclear medicine measured data by use of the computational device in parallel with recording the measured data.

摘要翻译： 公开了一种通过使用设计用于记录运动相关测量数据和记录核医学测量数据的医疗装置来考虑运动来记录来自患者的测量数据的方法和装置。 该方法可以包括通过使用医疗装置记录核医学测量数据，同时通过使用医疗装置记录与运动有关的测量数据，确定与患者的至少一个运动有关的至少一个运动信息项和/或在 通过评估先前记录的运动相关测量数据的至少一部分，以及通过使用以下方式对至少一部分核医学测量数据执行运动校正，在进行中的测量数据记录期间在患者体内进行至少一次运动 计算设备并行记录测量数据。

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：US20100277169A1

公开(公告)日：2010-11-04

申请号：US12773121

申请日：2010-05-04

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/44

CPC分类号： G01R33/56341 ,  A61B5/055 ,  A61B5/7207 ,  G01R33/4818 ,  G01R33/5616

摘要： In a method for diffusion-weighted acquisition of MR signals with an acquisition sequence that includes a diffusion module with multiple diffusion coding gradients and a readout module with readout gradients to acquire the MR signals, the acquisition sequence is configured to acquire MR signals that correspond to a predetermined signal coherence path. The method includes the acquisition of MR signals with the acquisition sequence, and the diffusion coding gradients are activated with predetermined gradient moments during the acquisition sequence. The gradient moments of the diffusion coding gradients are set such that MR signals that correspond to other coherence paths than the predetermined coherence path are reduced, wherein the adjustment of the gradient moments to achieve a predetermined reduction ensues on the basis of a threshold.

摘要翻译： 在用包括具有多个扩散编码梯度的扩散模块的采集序列和具有读出梯度的读出模块来获取MR信号的MR信号的扩散加权采集的方法中，获取序列被配置为获取对应于 预定的信号相干路径。 该方法包括利用获取序列获取MR信号，并且在采集序列期间以预定的梯度矩激活扩散编码梯度。 扩散扩散编码梯度的梯度矩被设定为使得与预定的相干路径相对应的其它相干路径的MR信号减小，其中基于阈值进行梯形矩的调整以实现预定的减小。

公开(公告)号：US20100176800A1

公开(公告)日：2010-07-15

申请号：US12684158

申请日：2010-01-08

申请人： Stephan Biber ,  Thorsten Feiweier ,  Wolfgang Renz

发明人： Stephan Biber ,  Thorsten Feiweier ,  Wolfgang Renz

IPC分类号： G01B7/14 ,  G01R33/44

CPC分类号： G01R33/3642 ,  G01R33/341

摘要： A simple position determination is enabled by a device and a method to determine the position of a local coil in a magnetic resonance apparatus, wherein at least one signal emitted by at least one transmission coil is received by the local coil and is evaluated with a position determination device in order to determine the position of the local coil.

摘要翻译： 一种简单的位置确定是通过一种装置和方法来实现的，该装置和方法用于确定磁共振装置中局部线圈的位置，其中由至少一个传输线圈发射的至少一个信号由局部线圈接收并且用位置 确定装置，以确定局部线圈的位置。

公开(公告)号：US07728588B2

公开(公告)日：2010-06-01

申请号：US11851462

申请日：2007-09-07

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01V3/00

CPC分类号： G01R33/561 ,  G01R33/4818 ,  G01R33/4824 ,  G01R33/56509

摘要： In a measurement sequence and apparatus for three-dimensional magnetic resonance imaging, in which an acquisition of measurement data ensues by scanning multiple lines in k-space; and the number of k-space lines is apportioned among a number of partial acquisitions so that scanning of associated k-space lines occurs in each partial acquisition, the k-space lines are associated with the partial acquisitions such that the association corresponds to the following association rule: (a) evaluation of each k-space line with a distance measure that characterizes the distance of the respective k-space line relative to the k-space center, (b) arrangement of the k-space lines to be scanned in an order dependent on the distance measure, (c) grouping of the k-space lines arranged in order into a number of groups with a number of successive k-space lines being combined into a group, and (d) association of the k-space lines with the partial acquisitions by, for each group, the k-space lines combined into this group are apportioned to different partial acquisitions.

摘要翻译： 在用于三维磁共振成像的测量序列和装置中，其中通过扫描k空间中的多条线来进行测量数据的采集; 并且在多次部分获取中分配k空间线的数量，使得在每个部分采集中发生相关联的k空间线的扫描，所述k空间线与部分采集相关联，使得该关联对应于以下 关联规则：（a）用表示各个k空间线相对于k空间中心的距离的距离度量来评估每个k空间线，（b）要扫描的k空间线的排列 依赖于距离测量的顺序，（c）按顺序排列的多个k个空间线组合成一组连续的k空间线组合成一组，以及（d）k- 对于每个组，对组合到该组的k空间线进行部分采集的空间线被分配给不同的部分采集。

公开(公告)号：US20090309596A1

公开(公告)日：2009-12-17

申请号：US12486087

申请日：2009-06-17

申请人： Thorsten Feiweier

发明人： Thorsten Feiweier

IPC分类号： G01R33/44

CPC分类号： G01R33/385 ,  G01R33/56518 ,  G01R33/56572 ,  G01R33/56581

摘要： A magnetic resonance system has a basic magnet system that generates a temporally static, spatially homogeneous basic magnetic field in an examination volume of the magnetic resonance system. At least one radio-frequency system is operated to excite nuclear spins in an examination subject in the examination volume to magnetic resonance, and to detect magnetic resonance signals from the examination subject. An overlay system generates overlay fields in the examination volume. The overlay system has at least one system of the first order and one system of the second order. The system of the first order generates fields that, to a first approximation, exhibit a spatial dependency of the first order. The system of the second order generates fields that, to a first approximation, exhibit a spatial dependency of the second order. A desired gradient and a correction volume are provided to a control device of the magnetic resonance system. The control device weights deviation of the amplitude of the complete field from the desired amplitude with a weighting function that is spatially dependent within the correction volume in order to check whether a minimum condition is satisfied. The control device operates the radio-frequency system with an operating frequency and controls the systems of the first and second order such that the deviation exhibits a spatial dependency of the second order and satisfies the minimum condition within the correction volume.

摘要翻译： 磁共振系统具有基本磁体系统，其在磁共振系统的检查体积中产生时间上均匀的空间均匀的基本磁场。 操作至少一个射频系统以将检查对象中的检查对象的核自旋激励到磁共振，并检测来自检查对象的磁共振信号。 覆盖系统在考试卷中生成覆盖字段。 覆盖系统具有至少一个第一阶系统和第二阶系统。 第一阶的系统产生对第一次近似显示第一阶的空间依赖性的场。 第二阶的系统产生对第一近似表现出二阶空间依赖性的场。 将期望的梯度和校正量提供给磁共振系统的控制装置。 控制装置利用空间上依赖于校正量的加权函数来校正完整场的振幅与期望幅度的偏差，以便检查是否满足最小条件。 控制装置以工作频率操作射频系统，并且控制第一和第二阶的系统，使得偏差表现出二阶空间依赖性，并满足校正量内的最小条件。