公开(公告)号：US20120074938A1

公开(公告)日：2012-03-29

申请号：US13245191

申请日：2011-09-26

申请人： David Grodzki ,  Bjoern Heismann

发明人： David Grodzki ,  Bjoern Heismann

IPC分类号： G01R33/48 ,  G01R33/34

CPC分类号： G01R33/4824 ,  A61B5/055

摘要： In a magnetic resonance system and method the imaging area is readout by: (a) switching at least two phase coding gradients in respective spatial directions, (b) at the full strength of the phase coding gradients, radiating a non-slice-selective RF excitation pulse, (c) after a time t1 after the last radiated excitation pulse, acquiring echo signals entered as raw data points along the radial k-space trajectory predetermined by the strength of the phase coding gradients, (d) repeating (a) through (c) with different phase coding gradients until k-space corresponding to the imaging area is read out in a first region along radial k-space trajectories, depending on the time t1, and (e) reading out a remainder of k-space that corresponds to the imaging area, that is not covered by the first region of k-space and includes the k-space center, in a different manner than by (a) through (d).

摘要翻译： 在磁共振系统和方法中，成像区域通过以下方式读出：（a）在各个空间方向上切换至少两个相位编码梯度，（b）在相位编码梯度的全强度下，辐射非切片选择性RF 励磁脉冲，（c）在最后辐射激励脉冲之后的时间t1之后，获取沿着相位编码梯度强度预定的径向k空间轨迹作为原始数据点输入的回波信号，（d）重复（a）到 （c）具有不同的相位编码梯度，直到根据时间t1在沿着径向k空间轨迹的第一区域中读出对应于成像区域的k空间，以及（e）读出剩余的k空间， 对应于与（a）至（d）不同的方式，不是由k空间的第一区域覆盖并且包括k空间中心的成像区域。

公开(公告)号：US09684048B2

公开(公告)日：2017-06-20

申请号：US14182512

申请日：2014-02-18

申请人： David Grodzki ,  Bjoern Heismann

发明人： David Grodzki ,  Bjoern Heismann

IPC分类号： G01R33/54 ,  G01R33/565

CPC分类号： G01R33/543 ,  G01R33/56509

摘要： In a method and a pulse sequence optimization device to determine a pulse sequence for a magnetic resonance system, a pulse sequence is selected for optimization that includes a number of radio-frequency pulses and a number of gradient pulses chronologically coordinated therewith. An automatic analysis of the pulse sequence takes place to identify fixed point/time periods in the pulse sequence that are to be left unmodified, and modifiable time intervals in the pulse sequence that may be optimized. An automatic optimization of gradient pulses in the modifiable time intervals takes place according to a predetermined optimization criterion, while keeping the length of modifiable time intervals constant.

公开(公告)号：US09320454B2

公开(公告)日：2016-04-26

申请号：US13630155

申请日：2012-09-28

申请人： David Grodzki ,  Bjoern Heismann ,  Sebastian Schmidt

发明人： David Grodzki ,  Bjoern Heismann ,  Sebastian Schmidt

IPC分类号： A61B5/06 ,  G01R33/28 ,  G01R33/48 ,  A61B19/00 ,  A61B5/055

CPC分类号： A61B5/062 ,  A61B5/055 ,  A61B34/20 ,  A61B2034/2065 ,  A61B2090/374 ,  G01R33/286 ,  G01R33/4816 ,  G01R33/4824

摘要： In a magnetic resonance (MR) method and system to generate a series of MR images to monitor the position of an interventional device located in an examination region, radial scanning of k-space is combined with other scans, in particular for the k-space center. The measurement time until the entirety of k-space corresponding to the imaging region is scanned is thereby markedly shortened in total. The short echo times that are possible with this reduce susceptibility artifacts in the reconstructed image data and enable a depiction of tissue or substances with very short T2 values, for example plastics. Due to the rapidly repeated excitation and acquisition of measurement data and the reconstruction of image data, it is possible to monitor a position of the intervention device in the examination region.

摘要翻译： 在用于产生一系列MR图像以监测位于检查区域中的介入装置的位置的磁共振（MR）方法和系统中，k空间的径向扫描与其他扫描结合，特别是与k空间 中央。 因此，扫描对应于成像区域的整个k空间的测量时间总共显着缩短。 可能的短回波时间可以减少重建图像数据中的敏感性伪影，并且能够描绘具有非常短T2值的组织或物质，例如塑料。 由于测量数据的快速反复激发和获取以及图像数据的重建，可以监视干预装置在检查区域中的位置。

公开(公告)号：US20140232397A1

公开(公告)日：2014-08-21

申请号：US14182538

申请日：2014-02-18

申请人： David Grodzki ,  Bjoern Heismann

发明人： David Grodzki ,  Bjoern Heismann

IPC分类号： G01R33/54

CPC分类号： G01R33/543 ,  G01R33/482 ,  G01R33/4824

摘要： In a method and a pulse sequence determination device to determine a pulse sequence for a magnetic resonance system, control protocol parameter values are initially acquired. A determination of k-space trajectory node points within k-space then takes place in a processor on the basis of the control protocol parameter values. The determination of the pulse sequence then takes place on the basis of the k-space trajectory node points. A method for operating a magnetic resonance system uses such a pulse sequence, and a magnetic resonance system embodies such a pulse sequence determination device.

摘要翻译： 在确定磁共振系统的脉冲序列的方法和脉冲序列确定装置中，最初获取控制协议参数值。 基于控制协议参数值，在处理器中发生k空间内的k空间轨迹节点的确定。 然后，基于k空间轨迹节点进行脉冲序列的确定。 用于操作磁共振系统的方法使用这样的脉冲序列，并且磁共振系统体现这样的脉冲序列确定装置。

公开(公告)号：US20130271139A1

公开(公告)日：2013-10-17

申请号：US13860609

申请日：2013-04-11

申请人： David Grodzki ,  Bjoern Heismann

发明人： David Grodzki ,  Bjoern Heismann

IPC分类号： G01R33/54

CPC分类号： G01R33/543 ,  G01R33/3854 ,  G01R33/482 ,  G01R33/4824

摘要： In a method to determine a control sequence for a magnetic resonance imaging system in order to acquire echo signal-based raw magnetic resonance data in k-space along one or more trajectories on the basis of the control sequence, the control sequence is optimized so that, to control a gradient magnetic field for at least a predetermined portion of the control sequence, a change of an attribute of the gradient magnetic field is limited. The limitation takes place so that a momentary amplitude change rate of the gradient magnetic field falls below a predetermined amplitude change rate limit value, and/or so that a momentary direction change rate of the gradient magnetic field falls below a predetermined direction change rate limit value, and/or so that a momentary gradient change rate of the gradient magnetic field that is based on a combination of the momentary amplitude change rate and the momentary direction change rate falls below a predetermined gradient change rate limit value.

摘要翻译： 在确定用于磁共振成像系统的控制序列的方法中，为了基于控制序列沿着一个或多个轨迹获取k空间中的基于回波信号的原始磁共振数据，优化控制序列，使得 为了控制至少控制序列的预定部分的梯度磁场，限制了梯度磁场的属性的变化。 发生限制，使得梯度磁场的瞬时振幅变化率下降到预定的振幅变化率极限值以下，和/或使得梯度磁场的瞬时方向变化率低于预定方向变化率极限值 和/或使得基于瞬时幅度变化率和瞬时方向变化率的组合的梯度磁场的瞬时梯度变化率下降到预定的梯度变化率极限值以下。

公开(公告)号：US20130076357A1

公开(公告)日：2013-03-28

申请号：US13630155

申请日：2012-09-28

申请人： David Grodzki ,  Bjoern Heismann ,  Sebastian Schmidt

发明人： David Grodzki ,  Bjoern Heismann ,  Sebastian Schmidt

IPC分类号： G01R33/44

CPC分类号： A61B5/062 ,  A61B5/055 ,  A61B34/20 ,  A61B2034/2065 ,  A61B2090/374 ,  G01R33/286 ,  G01R33/4816 ,  G01R33/4824

摘要： In a magnetic resonance (MR) method and system to generate a series of MR images to monitor the position of an interventional device located in an examination region, radial scanning of k-space is combined with other scans, in particular for the k-space center. The measurement time until the entirety of k-space corresponding to the imaging region is scanned is thereby markedly shortened in total. The short echo times that are possible with this reduce susceptibility artifacts in the reconstructed image data and enable a depiction of tissue or substances with very short T2 values, for example plastics. Due to the rapidly repeated excitation and acquisition of measurement data and the reconstruction of image data, it is possible to monitor a position of the intervention device in the examination region.

摘要翻译： 在用于产生一系列MR图像以监测位于检查区域中的介入装置的位置的磁共振（MR）方法和系统中，k空间的径向扫描与其他扫描结合，特别是与k空间 中央。 因此，扫描对应于成像区域的整个k空间的测量时间总共显着缩短。 可能的短回波时间可以减少重建图像数据中的敏感性伪影，并且能够描绘具有非常短的T2值的组织或物质，例如塑料。 由于测量数据的快速反复激发和获取以及图像数据的重建，可以监视干预装置在检查区域中的位置。

公开(公告)号：US10466325B2

公开(公告)日：2019-11-05

申请号：US15657343

申请日：2017-07-24

申请人： Andreas Greiser ,  David Grodzki ,  Daniel Nico Splitthoff

发明人： Andreas Greiser ,  David Grodzki ,  Daniel Nico Splitthoff

IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/30 ,  G01R33/385 ,  G01R33/28 ,  G01R33/36

摘要： The disclosure relates to a method for determining a sequence information element of a magnetic resonance sequence, a computer program product and an evaluation unit for performing such a method, and also a magnetic resonance device having such an evaluation unit. The method includes a determination of the sequence information element based on at least one pattern of the magnetic resonance sequence.

公开(公告)号：US10297023B2

公开(公告)日：2019-05-21

申请号：US15285626

申请日：2016-10-05

申请人： David Grodzki ,  Arne Hengerer ,  Michael Kaus ,  Elena Nioutsikou ,  Sebastian Schmidt

发明人： David Grodzki ,  Arne Hengerer ,  Michael Kaus ,  Elena Nioutsikou ,  Sebastian Schmidt

IPC分类号： G06K9/00 ,  G06T7/00 ,  G06T11/00

摘要： The embodiments relate to a reconstructing an image of an examination object, a medical imaging apparatus, and a computer program product where a first image data record is acquired with a first imaging modality and at least one further image data record of at least one further imaging modality is provided. At least one first image is reconstructed on the basis of the first image data record using the at least one further image data record.

公开(公告)号：US09696400B2

公开(公告)日：2017-07-04

申请号：US14057361

申请日：2013-10-18

申请人： David Grodzki ,  Mathias Nittka

发明人： David Grodzki ,  Mathias Nittka

IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/483 ,  G01R33/385 ,  G01R33/561

CPC分类号： G01R33/543 ,  G01R33/3854 ,  G01R33/4833 ,  G01R33/5617

摘要： A method and a pulse sequence optimization device to optimize a pulse sequence for a magnetic resonance system, wherein the pulse sequence includes at least one refocusing pulse, one slice selection gradient pulse, and one gradient spoiler pulse. The pulse duration of the refocusing pulse is shortened, and the pulse duration of the slice selection gradient pulse is adapted to the shortened pulse duration of the refocusing pulse. The amplitude of the slice selection gradient pulse is increased so that the same slice thickness is selected as before the shortening of the pulse duration of the refocusing pulse. The pulse shape of the gradient spoiler pulse is adapted without changing a total spoiler moment, and an optimally shortened pulse duration of the refocusing pulse is achieved when, with the adaptation of the pulse shape of the gradient spoiler pulse, the maximum amplitude of the gradient spoiler pulse equals the amplitude of the slice selection gradient pulse, and an edge steepness of the gradient spoiler pulse is minimized.

公开(公告)号：US09696399B2

公开(公告)日：2017-07-04

申请号：US14050580

申请日：2013-10-10

申请人： David Grodzki

发明人： David Grodzki

IPC分类号： G01V3/00 ,  G01R33/48 ,  G01R33/56 ,  A61B5/055

CPC分类号： G01R33/482 ,  A61B5/055 ,  G01R33/4816 ,  G01R33/5602

摘要： In a method and magnetic resonance apparatus for image acquisition using a magnetic resonance sequence in which k-space corresponding to the imaging area is scanned, a first region of k-space, which does not include the center of k-space, is scanned radially along a number of spokes emanating from the k-space center, and at least two phase coding gradients are completely ramped up before the excitation pulse. A second central region of k-space, which remains without the first region, is scanned in a Cartesian manner. For contrast increase a pre-pulse is provided before a predetermined number of individual measurements. The number of spokes is selected so a measurement point nearest to the k-space center is measured at a predetermined point in time after the pre-pulse, which is optimal for signal-to-noise ratio and/or contrast.