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21. 发明授权

US5144239A Circularly polarizing RF antenna for an MRI apparatus 失效
标题翻译：用于MRI装置的圆形极化射频天线
公开(公告)号：US5144239A
公开(公告)日：1992-09-01
申请号：US565137
申请日：1990-08-10
申请人： Ralph Oppelt , Horst Siebold
发明人： Ralph Oppelt , Horst Siebold
IPC分类号： A61B5/055 , G01R33/34 , G01R33/341
CPC分类号： G01R33/3678 , G01R33/34076 , G01R33/34007
摘要： A circularly polarizing RF antenna suitable for use in a magnetiic resonance imaging tomography apparatus has four current loops, each formed by two U-shaped conductors with the ends of the lateral legs of the U-shaped conductors disposed opposite to each other in mirror-symmetric fashion, and the ends of the lateral legs being bridged by a resonant capacitor. The current loops are arranged on a carrier which forms a portion of a hollow cylinder, and which is divided in an axial direction between two of the current loops, so that at least one of the current loops is removable without electrical contacts. A divisible RF antenna is thus achieved into which a head or a knee joint can be easily introduced for imaging.
摘要翻译：适用于磁共振成像断层摄影装置的圆偏振RF天线具有四个电流回路，每个由两个U形导体形成，其U形导体的侧支腿的端部彼此相对设置成镜像对称时尚，并且侧腿的端部被谐振电容器桥接。电流回路布置在形成中空圆柱体的一部分并且在两个电流回路之间沿轴向方向分开的载体上，使得至少一个电流回路可移除而没有电接触。因此可以实现可分割的RF天线，其中可以容易地引入头部或膝关节以用于成像。

22. 发明授权

US5079503A Magnetic resonance imaging apparatus and method for operating same 失效
标题翻译：磁共振成像装置及其操作方法
公开(公告)号：US5079503A
公开(公告)日：1992-01-07
申请号：US498391
申请日：1990-03-26
申请人： Horst Siebold , Wolfgang Frie
发明人： Horst Siebold , Wolfgang Frie
IPC分类号： G01R33/385
CPC分类号： G01R33/3852
摘要： A magnetic resonance imaging apparatus generates tomograms according to the echo planar imaging method (EPI), with at least one of the gradient coils having a resonant circuit allocated thereto which is excited by an amplifier. A capacitor forms a series resonant circuit with the gradient coil, and a controlled gain amplifier which is operated as a current regulator, such as a switched current regulator, is connected to this series resonant circuit. The read-out gradient G.sub.x is switched on at a time t.sub.0, the gradient G.sub.x having a transient region .tau..sub.1 beginning at t.sub.0 and ending at a time t.sub.2. The gradient current I(t) is steady in this transient region .tau..sub.1, and the integral of the gradient current I(t) over t.sub.0 through t.sub.2 is zero.
摘要翻译：磁共振成像装置根据回波平面成像方法（EPI）生成断层图像，其中至少一个梯度线圈具有被放大器激励的谐振电路。电容器与梯度线圈形成串联谐振电路，并且作为电流调节器（例如开关电流调节器）操作的受控增益放大器连接到该串联谐振电路。读出梯度Gx在时间t0接通，梯度Gx具有从t0开始并在时间t2结束的瞬时区域τ1。该过渡区域T 1中的梯度电流I（t）是稳定的，t0到t2之间的梯度电流I（t）的积分为零。

23. 发明授权

US5012192A Gradient coil system for a nuclear resonance tomography apparatus 失效
标题翻译：用于核共振断层扫描仪的梯度线圈系统
公开(公告)号：US5012192A
公开(公告)日：1991-04-30
申请号：US442077
申请日：1989-11-28
申请人： Horst Siebold
发明人： Horst Siebold
IPC分类号： G01R33/20 , A61B5/055 , G01R33/385
CPC分类号： G01R33/385
摘要： A gradient coil system for a nuclear magnetic resonance tomography apparatus has main x and y coils, which are split arc saddle coils. The coil arcs are split so that their coupling increases with increasing distance from the plane of symmetry. The x and y main coils have respective x and y auxiliary coils allocated to them, which are also saddle coils and which have an aperture angle less than 90.degree., and which are arranged on the same cylindrical surface. The characteristics of the elementary saddle coils which define the gradient coil field are matched so that the noise terms of the series development of the gradient field are at least partially eliminated.
摘要翻译：用于核磁共振断层摄影装置的梯度线圈系统具有主x和y线圈，它们是分割的弧鞍线圈。线圈弧被分开，使得它们的耦合随着与对称平面的距离的增加而增加。 x和y主线圈具有分配给它们的各自的x和y辅助线圈，它们也是鞍形线圈，并且具有小于90°的孔径角，并且布置在同一圆柱形表面上。匹配定义梯度线圈场的基本鞍形线圈的特性，使得梯度场的串联发展的噪声项至少部分被消除。

24. 发明授权

US4876510A Apparatus for nuclear spin tomography having superconducting base field magnetic coils and a radiation shield 失效
标题翻译：具有超导基极磁场线圈和辐射屏蔽的核自旋断层摄影装置
公开(公告)号：US4876510A
公开(公告)日：1989-10-24
申请号：US193513
申请日：1988-05-12
申请人： Horst Siebold , Gunter Ries
发明人： Horst Siebold , Gunter Ries
IPC分类号： G01R33/20 , A61B5/055 , A61B10/00 , G01R33/38 , G01R33/3815 , G01R33/421 , H01F6/00 , H01F7/20
CPC分类号： G01R33/421 , G01R33/3815 , Y10S505/85
摘要： Magnet coil system for nuclear spin tomography has superconducting coils for generating a homogeneous magnetic base field and nonsuperconducting coils within an interior region defined by the base field coils for developing magnetic field gradients. At least one cooled radiation shield of electrically and thermally conductive material is arranged between the gradient coils and the superconducting base field coils. To prevent eddy currents started in the radiation shield from distorting the gradient fields, the radiation field contains superconducting material of a "second kind" that is a high temperature superconductor. The superconductor is in a nonsuperconducting state at the start of an excitation process for the base field coils and in a superconducting state during the undisturbed operation of the magnet coil system.
摘要翻译：用于核自旋断层扫描的磁体线圈系统具有用于在由用于显现磁场梯度的基极线圈限定的内部区域内产生均匀磁场的超导线圈和非超导线圈。导电和导热材料的至少一个冷却的辐射屏蔽被布置在梯度线圈和超导基极线圈之间。为了防止在辐射屏蔽层中开始的涡流扭曲梯度场，辐射场包含作为高温超导体的“第二种”的超导材料。超导体在基极励磁线圈的激励过程开始时处于非导通状态，并且在磁体线圈系统的未受干扰的操作期间处于超导状态。

25. 发明授权

US4758812A Frame structure for a magnet system for nuclear spin tomography 失效
标题翻译：用于核自旋断层扫描的磁体系统的框架结构
公开(公告)号：US4758812A
公开(公告)日：1988-07-19
申请号：US32763
申请日：1987-03-31
申请人： Helmut Forster , Horst Siebold
发明人： Helmut Forster , Horst Siebold
IPC分类号： G01R33/20 , A61B5/055 , A61B10/00 , G01R33/38 , G01R33/421 , H01F7/20 , H01F7/00
CPC分类号： G01R33/3802 , G01R33/381 , G01R33/421
摘要： A frame structure for supporting individual magnetic coils forming a magnet system used in nuclear spin tomography comprises several frame parts made from a ferromagnetic material to provide relatively simple magnetic shielding. The individual magnetic coils are concentrically aligned one behind the other along a common axis to form the magnet system. Several elongate beam, rod, or plate-shaped magnetic shielding elements extend parallel to the common axis and are evenly distributed in the circumferential direction around the magnet system thus forming a generally cylindrical surface. End-plate magnetic shielding parts having a central opening of predetermined radius are provided at the end faces of the cylindrical surface formed by the shielding elements to create a cage-like frame structure. Coil receiving elements can be used to rigidly connect the axis-parallel shielding elements with the individual magnetic coils.
摘要翻译：用于支撑形成用于核自旋断层摄影术的磁体系统的各个磁性线圈的框架结构包括由铁磁材料制成的几个框架部件，以提供相对简单的磁屏蔽。各个磁性线圈沿共同的轴线一个一个地彼此同心对准以形成磁体系统。几个细长的梁，杆或板状磁屏蔽元件平行于公共轴线延伸，并且围绕磁体系统在圆周方向上均匀分布，从而形成大致圆柱形的表面。在由屏蔽元件形成的圆筒形表面的端面处设置具有预定半径的中心开口的端板磁屏蔽部件，以形成笼状框架结构。线圈接收元件可用于将轴平行屏蔽元件与各个磁性线圈刚性连接。

26. 发明授权

US4593261A Device for cooling a magnet system 失效
标题翻译：用于冷却磁体系统的装置
公开(公告)号：US4593261A
公开(公告)日：1986-06-03
申请号：US696105
申请日：1985-01-29
申请人： Helmut Forster , Karl-Georg Heinzelmann , Horst Siebold , Jurgen Vetter
发明人： Helmut Forster , Karl-Georg Heinzelmann , Horst Siebold , Jurgen Vetter
IPC分类号： G01R33/20 , A61B5/055 , A61B10/00 , G01R33/3815 , H01F5/00 , H01F7/20 , H01F27/10
CPC分类号： H01F7/20 , H01F27/10
摘要： A device for cooling a magnet system, especially in an installation for nuclear spin tomography which magnet system comprises several annular magnet coil windings which are made of ribbons of normal conducting material and are connected at their end faces over a large area to cooling elements in a heat conducting manner, the cooling elements cooled by a cooling medium flowing in coolant lines under forced flow. To assure an effective and reliable cooling of the coil windings on each end face of a magnet coil winding, a predetermined number of identically designed cooling elements uniformly distributed in the circumferential direction is cemented on, each cooling element comprising at least a heat conduction plate of annular sector shape which is provided with a predetermined number of slots uniformly distributed in the circumferential direction and to which the coolant line is connected over several turns in a heat conducting manner.
摘要翻译：一种用于冷却磁体系统的装置，特别是在用于核自旋断层扫描的装置中，该磁体系统包括由正常导电材料的带制成的几个环形磁体线圈绕组，并且在其大面积上连接到冷却元件导热方式，冷却元件由在强制流动下在冷却剂管线中流动的冷却介质冷却。为了确保电磁线圈绕组的每个端面上的线圈绕组的有效和可靠的冷却，在圆周方向上均匀分布的预定数量的相同设计的冷却元件被胶合，每个冷却元件至少包括一个导热板环形扇形，其具有在圆周方向上均匀分布的预定数量的狭槽，并且冷却剂管线以热传导方式连接几匝。

27. 发明授权

US4520315A Nuclear spin tomography method 失效
标题翻译：核自旋断层扫描法
公开(公告)号：US4520315A
公开(公告)日：1985-05-28
申请号：US413962
申请日：1982-09-01
申请人： Wilfried Loeffler , Arnulf Oppelt , Horst Siebold
发明人： Wilfried Loeffler , Arnulf Oppelt , Horst Siebold
IPC分类号： G01R33/54 , G01R33/565 , G01R33/08
CPC分类号： G01R33/482 , G01R33/56563
摘要： A disclosed exemplary method provides complete mensuration of all two-dimensional Fourier components of a nuclear spin property and image reconstruction. In spite of unavoidable inhomogeneities of the DC magnetic field, an optimum sectional image is to be obtained. To this end, the exemplary method provides an optimally brief pulse train in that first, by means of a 90.degree.-Hf-pulse with a switched-on z-gradient a z=constant layer is excited, after termination of which an x-gradient and simultaneously a y-gradient are switched on. Following this is a 180.degree.-Hf-pulse which is followed by a z- and simultaneously a y-gradient, so that the difference between the y-gradient effect before the 180.degree.-Hf-pulse and thereafter can be varied. Then follows that particular x-gradient during which the nuclear spin echo is measured (whose symmetry center arises at a fixed time). For a N.times.N-image (N=number of the image points e.g. 128 in one line), measurements are taken for N such operating cycles with respectively varying differences of the y-gradient effects. The disclosed method is particularly capable of implementation in medical diagnostics (Zeugmatography).
摘要翻译：所公开的示例性方法提供核自旋性质和图像重建的所有二维傅立叶分量的完整测量。尽管DC磁场的不均匀性是不可避免的，但是要获得最佳的截面图像。为此，该示例性方法提供了最佳简短的脉冲序列，其中首先，通过90°-Hf脉冲与开启的z-梯度z i =恒定层被激发，其终止后，x梯度同时开启y梯度。之后是180°-H脉冲，随后是z-并且同时具有y梯度，使得在180°-H脉冲之间的y梯度效应之间的差可以改变。然后遵循特定的x梯度，在此期间测量核自旋回波（其对称中心在固定时间出现）。对于N×N图像（N =图像点的数量，例如一行中的128），对于N个这样的操作周期，分别改变y梯度效应的差异来进行测量。所公开的方法特别能够在医学诊断（Zeugmatography）中实现。

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