公开(公告)号：US06236205B1

公开(公告)日：2001-05-22

申请号：US09212624

申请日：1998-12-16

申请人： Kai-Michael Lüdeke ,  Volker Rasche

发明人： Kai-Michael Lüdeke ,  Volker Rasche

IPC分类号： G01V300

CPC分类号： G01R33/285 ,  A61B5/06

摘要： The invention relates to a magnetic resonance (MR) device which is provided with a medical instrument (10) which is to be introduced into an object (1) to be examined, and also with a coil system (11) which is arranged in or on the instrument (10) and includes at least one coil for receiving and/or transmitting an RF signal, to a medical instrument (10) of this kind and also to a method of determining the position of such a medical instrument (10) that can be introduced into an object (1) to be examined. According to the invention the coil system (11) in an MR device of this kind forms a resonant circuit (20) in conjunction with a capacitor (19) and a modulation unit (12) is provided in order to modulate an RF signal coupled into the coil system (11).

摘要翻译： 本发明涉及一种磁共振（MR）装置，该磁共振（MR）装置设置有待被引入待检查对象物（1）中的医疗器械（10），并且还包括线圈系统（11） 在仪器（10）上并且包括用于接收和/或发送RF信号的至少一个线圈到这种医疗器械（10），并且还包括确定这样的医疗器械（10）的位置的方法， 可以被引入待检查的对象（1）中。 根据本发明，这种类型的MR器件中的线圈系统（11）与电容器（19）结合形成谐振电路（20），并且提供调制单元（12），以便调制耦合到 线圈系统（11）。

公开(公告)号：US6151378A

公开(公告)日：2000-11-21

申请号：US274390

申请日：1999-03-23

申请人： Volker Rasche ,  Michael Grass ,  Henning Braunisch

发明人： Volker Rasche ,  Michael Grass ,  Henning Braunisch

IPC分类号： G06T1/00 ,  G06T11/00 ,  A61B6/03

CPC分类号： G06T11/006 ,  Y10S378/901

摘要： The invention relates to a method and a device for the processing of medical image data so as to determine output function data (S(k)), situated at grid points (8) of a selected grid, from input function data (I.sub.c (r)) situated at grid points (2, 7) of a Cartesian grid (1, 6). A method of this kind is used, for example in magnetic resonance tomography or computer tomography, so as to calculate arbitrary projections from given function data. The method of the invention includes the following steps: determination of modified input function data (I.sub.c '(r)) by division of the input function data (I.sub.c (r)) by the Fourier transform (c(r)) of a convolution kernel (C(k)), determination of the Fourier transform (S.sub.c '(k)) of the modified input function data (I.sub.c '(r)), and determination of the output function data (S(k)) by convolution of the Fourier transform (S.sub.c '(k)) of the modified input function data with the convolution kernel (C(k)), the convolution kernel (C(k)) being a weighting function for weighting the grid points (2, 7) of the Cartesian grid (1, 6) in conformity with their distance from grid points (8) of the selected grid. The method according to the invention offers essentially a substantial reduction of the calculation time required.

摘要翻译： 本发明涉及一种用于处理医学图像数据的方法和装置，以便根据输入函数数据（Ic（r（k））确定位于所选网格的网格点（8）处的输出函数数据 ））位于笛卡尔网格（1,6）的网格点（2,7）处。 使用这种方法，例如在磁共振断层摄影或计算机断层摄影中，以便从给定的功能数据计算任意的投影。 本发明的方法包括以下步骤：通过将输入函数数据（Ic（r））除以卷积核的傅立叶变换（c（r））来确定修改后的输入函数数据（Ic'（r）） （C（k）），修正输入函数数据（Ic'（r））的傅里叶变换（Sc'（k））的确定以及输出函数数据（S（k））的确定， 通过卷积核（C（k））的修正输入函数数据的傅立叶变换（Sc'（k）），卷积核（C（k））是用于对网格点（2,7）进行加权的加权函数 笛卡尔网格（1,6）与其与所选网格的网格点（8）的距离。 根据本发明的方法基本上提供了所需的计算时间的显着减少。

公开(公告)号：US5938599A

公开(公告)日：1999-08-17

申请号：US754360

申请日：1996-11-22

申请人： Volker Rasche ,  Peter Bornert ,  Kai-Michael Ludeke ,  Michael Kuhn

发明人： Volker Rasche ,  Peter Bornert ,  Kai-Michael Ludeke ,  Michael Kuhn

IPC分类号： A61B5/055 ,  G01R33/28 ,  G01R33/561 ,  G01V3/14

CPC分类号： G01R33/285 ,  G01V3/14 ,  G01R33/56308

摘要： The position of an object, for example a catheter, in a body to be examined is determined so as to enable monitoring of its movement through the body at the same time that information concerning the anatomy in the surroundings of the object is to be acquired. An as high as possible temporal and spatial resolution should be achieved for this purpose. To this end, the nuclear magnetization in the surrounding region of the object is determined by means of a micro-coil which is mounted on the inserted object, it being possible to determine the position of the object from the nuclear magnetization. Subsequently, an RF coil system is used to perform a line scan around this position in order to determine the nuclear magnetization in a line-shaped region.

摘要翻译： 确定物体（例如导管）在被检体内的位置，以便能够同时监视其在物体周围的解剖结构信息的同时通过身体的运动。 为此目的应该达到尽可能高的时间和空间分辨率。 为此，通过安装在插入对象上的微型线圈来确定物体的周围区域的核磁化，可以从核磁化确定物体的位置。 随后，RF线圈系统用于围绕该位置执行线扫描，以便确定线状区域中的核磁化。

公开(公告)号：US5933006A

公开(公告)日：1999-08-03

申请号：US966597

申请日：1997-11-10

申请人： Volker Rasche ,  Roland Proska

发明人： Volker Rasche ,  Roland Proska

IPC分类号： G01R33/54 ,  A61B5/055 ,  G01R33/561 ,  G01R33/567 ,  G01V3/00

CPC分类号： G01R33/56509 ,  G01R33/4824 ,  G01R33/56308

摘要： An MR method for the reduction of motion artefacts is applicable to procedures where a plurality of MR data sets concerning an object to be examined are acquired successively in time. Because the object to be examined is liable to move during the period of time required to acquire an MR data set for the reconstruction of a high-resolution MR image, the high-resolution MR image often contains disturbing motion artefacts. In order to avoid such motion artefacts in the high-resolution MR images, first a plurality of MR data sets are acquired for low-resolution MR images; this operation can be performed within a shorter measuring period. Image transformation parameters are determined from the comparison of the low-resolution images so as to be taken into account for the reconstruction of the high-resolution MR image from the MR data sets acquired.

摘要翻译： 用于减少运动伪影的MR方法适用于在时间上连续获取关于待检查对象的多个MR数据集的过程。 由于要获取用于重建高分辨率MR图像的MR数据组所需的时间段内被检查对象易于移动，所以高分辨率MR图像通常包含干扰运动伪像。 为了避免高分辨率MR图像中的这种运动伪像，首先为低分辨率MR图像获取多个MR数据集; 该操作可以在更短的测量周期内进行。 从低分辨率图像的比较中确定图像变换参数，以便从所获取的MR数据集重建高分辨率MR图像中考虑。

公开(公告)号：US5677627A

公开(公告)日：1997-10-14

申请号：US539136

申请日：1995-10-04

申请人： Volker Rasche

发明人： Volker Rasche

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/54 ,  G01R33/565

CPC分类号： G01R33/4835 ,  G01R33/56545

摘要： A magnetic resonance (MR) multislice method, in which in each cycle nuclear magnetization is successively excited in a respective group of measuring slices which are situated at a distance from one another and the MR signals generated under the influence of at least one gradient magnetic field are acquired, is such that the groups of measuring slices excited in different cycles exhibit a spatial offset relative to one another which is smaller than the distance between the measuring slices excited in a cycle and the gradient magnetic fields are varied from one cycle to another. The nuclear magnetization distribution in a reconstruction slice is reconstructed from the MR signals acquired in the various cycles and originating from measuring slices which neighbour one another in space and are situated to both sides of the reconstruction slice. In such a multislice method, reconstruction is improved in that the direction of the gradient of the gradient magnetic field active during the acquisition of the MR signal is varied from one cycle to another in such a manner that the directions occurring in all cycles together are distributed over an angular range of 360.degree., the directional differences being greater as the offset between the groups of measuring slices associated with the cycles is greater. Further the MR signals from measuring slices situated at a small distance from the reconstruction slice enter the reconstruction with a weighting factor which is higher than that of the MR signals from measuring slices situated at a greater distance from the reconstruction slice.

摘要翻译： 一种磁共振（MR）多层方法，其中在每个循环中，核磁化在彼此相距一定距离的相应组的测量片中连续激发，并且在至少一个梯度磁场的影响下产生的MR信号 使得在不同周期中激发的测量片组相对于彼此表现出小于在一个周期中激发的测量片之间的距离并且梯度磁场从一个周期变化到另一周期的空间偏移。 重构切片中的核磁化分布从在各种周期中获取的MR信号重建，并且源自在空间中彼此相邻且位于重建切片两侧的测量片。 在这种多层方法中，改进重建是因为在采集MR信号期间有效的梯度磁场的梯度的方向从一个周期变化到另一个周期，使得在所有周期中一起发生的方向一起分布 在360度的角度范围内，方向差异越大，因为与周期相关联的测量片段组之间的偏移量越大。 此外，来自位于与重建切片小距离的测量片的MR信号以比位于距离重建切片更远的距离的测量片的MR信号的加权因子进入重建。