公开(公告)号：US5523689A

公开(公告)日：1996-06-04

申请号：US420213

申请日：1995-04-11

Applicant: Ralph Oppelt ,  Wilhelm Duerr

Inventor： Ralph Oppelt ,  Wilhelm Duerr

IPC: G01R33/20 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36 ,  G01R33/422 ,  H01Q1/36 ,  G01V3/00

CPC classification number: G01R33/34046 ,  G01R33/34007 ,  G01R33/422 ,  G01R33/56518

Abstract: A radio-frequency antenna for a magnetic resonance apparatus has an antenna conductor in the form of a ribbon conductor. The ribbon antenna conductor has interconnects arranged side-by-side. Neighboring interconnects are connected to one another via bridges that conduct radio-frequency currents.

Abstract translation: 用于磁共振装置的射频天线具有带状导体形式的天线导体。 带状天线导体具有并排布置的互连。 相邻的互连通过传导射频电流的桥连接。

公开(公告)号：US5128615A

公开(公告)日：1992-07-07

申请号：US623210

申请日：1990-12-06

Applicant: Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

Inventor： Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

IPC: G01R33/32 ,  A61B5/055 ,  G01R33/34 ,  G01R33/341

CPC classification number: G01R33/3678 ,  G01R33/34 ,  G01R33/341

Abstract: A resonator for use in a magnetic resonance imaging apparatus for transmitting and receiving high frequency signals is formed by a combination of two antenna sub-systems, which generate respective magnetic fields which are perpendicular to each other, with the currents in the sub-system being phase-shifted by 90.degree. relative to each other, and each sub-system includes a capacitance which defines the resonant frequency. Each of the sub-systems forms a current loop, the current loops containing a common current network and a common base plate, which serves as a return path for both current loops. The junctions of the current network are connected via the resonant capacitances to the base plate, which consists of electrically conductive material. A circularly polarizing resonator is achieved for the transversal, fundamental field of the imaging apparatus, with the resonator also being capable of use as a surface resonator if the spacing between the current network and the base plate is small.

Abstract translation: 用于发送和接收高频信号的磁共振成像装置的谐振器由两个天线子系统的组合形成，两个天线子系统产生彼此垂直的各个磁场，子系统中的电流为 相对于彼此相移90度，并且每个子系统包括限定谐振频率的电容。 每个子系统形成电流回路，电流回路包含公共的当前网络和公共基板，其作为两个电流回路的返回路径。 当前网络的接点通过谐振电容连接到由导电材料组成的基板。 对于成像装置的横向基本场，实现圆偏振谐振器，如果当前网络和基板之间的间隔小，则谐振器也能够用作表面谐振器。

公开(公告)号：US4920522A

公开(公告)日：1990-04-24

申请号：US41216

申请日：1987-04-22

Applicant: Wilhelm Duerr ,  Ralph Oppelt

Inventor： Wilhelm Duerr ,  Ralph Oppelt

IPC: A61B5/055 ,  A61B10/00 ,  G01R29/08 ,  G01R33/02 ,  G01R33/028 ,  G01R33/36 ,  G01R33/58 ,  G10K11/24 ,  G01V1/00

CPC classification number: G01R33/3621 ,  A61B5/055 ,  G01R29/0892 ,  G01R33/028 ,  G10K11/24 ,  G01R33/3692

Abstract: A method and apparatus for measuring electrical or magnetic fields, such as high-frequency alternating fields in a nuclear magnetic resonance tomography device, convert a test signal into a corresponding ultrasound signal, and transmit the ultrasound signal to a receiver, where the received signal is converted back into an electrical signal. The transmission path contains no metallic components and thus does not cause any disturbance in the field being measured.

Abstract translation: 用于测量诸如核磁共振断层摄影装置中的高频交变场的电场或磁场的方法和装置将测试信号转换为对应的超声信号，并将超声信号发送到接收机，其中接收的信号为 转换回电信号。 传输路径不含金属成分，因此不会在被测场中产生干扰。

公开(公告)号：US4725782A

公开(公告)日：1988-02-16

申请号：US36797

申请日：1987-04-10

Applicant: Ralph Oppelt ,  Wilhelm Duerr

Inventor： Ralph Oppelt ,  Wilhelm Duerr

IPC: A61B10/00 ,  A61B5/055 ,  G01R33/32 ,  G01R33/34 ,  G01R33/422 ,  G01R33/20

CPC classification number: G01R33/422

Abstract: An antenna structure for exciting a substantially homogeneous magnetic RF field and/or for receiving RF signals in a nuclear magnetic resonance tomography apparatus includes a hollow cylindrical conductor sheath which is substantially transmissive at low frequencies for gradient magnetic fields, a number of conductor units within the conductor sheath, each conductor unit including at least one conductor element, and RF reflector disposed at the end faces of the antenna structure and an external energy feed or reception device. In this antenna structure, the current drop which increasingly occurs toward the end faces of the antenna structure is largely compensatable by shaping the electrically conductive cross-section of the conductor units so as to decrease symmetrically from an axial center of the antenna structure moving toward the end faces of the structure. The conductor units thus have a largest cross-section at a center of the antenna structure, and a smallest cross-section at the end faces.

Abstract translation: 在核磁共振断层摄影装置中用于激发基本上均匀的磁RF场和/或用于接收RF信号的天线结构包括：中空圆柱形导体护套，其在低频下对于梯度磁场基本上是透射的，所述多个导体单元在 导体护套，每个导体单元包括至少一个导体元件，以及设置在天线结构的端面处的RF反射器和外部能量馈送或接收装置。 在该天线结构中，朝向天线结构的端面越来越多地发生的电流下降通过对导体单元的导电横截面进行成形以便从天线结构的轴向中心对称地向着 结构的端面。 因此，导体单元在天线结构的中心处具有最大的横截面，并且在端面处具有最小的横截面。

公开(公告)号：US5574372A

公开(公告)日：1996-11-12

申请号：US374028

申请日：1995-01-18

Applicant: Michael Moritz ,  Ralph Oppelt ,  Wilhelm Duerr

Inventor： Michael Moritz ,  Ralph Oppelt ,  Wilhelm Duerr

IPC: A61B5/055 ,  G01R33/422 ,  G01R33/28

CPC classification number: A61B5/055 ,  G01R33/422

Abstract: In a diagnostic magnetic resonance apparatus having an examination space, a radio-frequency antenna and a gradient coil system, the radio-frequency antenna is arranged closer to the examination space than is the gradient coil system. A radio-frequency shield arranged between the radio-frequency antenna and the gradient coil system, and has a first electrically conductive layer arrangement and a second electrically conductive layer arrangement arranged lying opposite the first arrangement, these being separated from one another by a dielectric. The layer arrangements have interconnects arranged side-by-side that are separated from one another by electrically insulating slots. The slots of the first layer arrangement are arranged offset relative to the slots in the second layer arrangement. Neighboring interconnects in at least one layer arrangement are connected to one another via bridges that conduct high-frequency currents, the bridges being arranged such that currents induced in the layer arrangement by the radio-frequency antenna can essentially flow only between the neighboring interconnects via the bridges.

Abstract translation: 在具有检查空间的诊断用磁共振装置，射频天线和梯度线圈系统中，与梯度线圈系统相比，射频天线配置得比检查空间更近。 布置在射频天线和梯度线圈系统之间的射频屏蔽，并且具有布置成与第一布置相对的第一导电层布置和第二导电层布置，它们通过电介质彼此分离。 层布置具有并排布置的互连，其通过电绝缘槽相互分离。 第一层布置的槽相对于第二层布置中的槽布置成偏置。 至少一层结构中的相邻互连通过传导高频电流的桥连接，桥被布置成使得由射频天线在层布置中感应的电流本质上只能在相邻互连之间经由 桥梁

公开(公告)号：US5153517A

公开(公告)日：1992-10-06

申请号：US626442

申请日：1990-12-12

Applicant: Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

Inventor： Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

IPC: A61B5/055 ,  G01R33/34 ,  G01R33/341

CPC classification number: G01R33/3678 ,  G01R33/341

Abstract: A surface resonator for use in a magnetic resonance imaging apparatus having a transversal fundamental magnetic field is composed of two sub-systems, each generating a magnetic field with the magnetic fields being perpendicular relative to each other. Each sub-system contains two current loops, both of which enclose the magnetic field allocated to them in the same plane. A circularly polarizing surface resonator is thus obtained for the transversal fundamental magnetic field.

Abstract translation: 用于具有横向基本磁场的磁共振成像装置的表面谐振器由两个子系统组成，每个子系统产生磁场，磁场相对于彼此垂直。 每个子系统包含两个电流回路，两个电流环都包含在同一平面上分配给它们的磁场。 因此获得了用于横向基本磁场的圆偏振面谐振器。

公开(公告)号：US4922204A

公开(公告)日：1990-05-01

申请号：US330110

申请日：1989-03-29

Applicant: Wilhelm Duerr ,  Ralph Oppelt

Inventor： Wilhelm Duerr ,  Ralph Oppelt

IPC: G01R33/32 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36

CPC classification number: G01R33/3685

Abstract: For operating the radio-frequency antenna of a nuclear magnetic resonance tomography apparatus, the antenna being connected to an asymmetrical line, a sheath wave trap is provided between the antenna and the line, with the inductor of the sheath wave trap being a toroid. A low-scatter sheath wave trap is obtained in this manner, particularly suitable for circularly polarized resonators. The trap suppresses difference currents caused by asymmetries, and thus simultaneously functions as a balanced-to-unbalanced transformer (balun).

Abstract translation: 为了操作核磁共振断层摄影装置的射频天线，天线与非对称线路连接，在天线和线路之间设置鞘波陷阱，鞘波陷阱的电感器为环形线圈。 以这种方式获得低散射鞘波陷阱，特别适用于圆偏振谐振器。 陷波器抑制由不对称引起的差异电流，从而同时用作平衡 - 不平衡变压器（balun）。

公开(公告)号：US4841249A

公开(公告)日：1989-06-20

申请号：US105003

申请日：1987-10-06

Applicant: Wilhelm Duerr ,  Hartwig Ingwersen ,  Norbert Krause ,  Ralph Oppelt

Inventor： Wilhelm Duerr ,  Hartwig Ingwersen ,  Norbert Krause ,  Ralph Oppelt

IPC: G01R33/32 ,  A61B5/055 ,  G01R33/341 ,  G01R33/343

CPC classification number: G01R33/341 ,  G01R33/343

Abstract: A surface resonator for use in nuclear magnetic resonance tomography is a single turn loop of ribbon-like electrical conductor having spaced ends facing each other which form a capacitor whose capacitance determines the resonant frequency. The loop of ribbon-like conductor is shaped to conform substantially to the generated surface of a truncated cone. The ends of the loop may be in the form of spaced plates for providing the necessary capacitance, or may be connected by one or more discrete component capacitors.

Abstract translation: 用于核磁共振断层摄影的表面谐振器是带状电导体的单回路，其具有彼此面对的间隔开的端部，其形成电容器，其确定谐振频率。 带状导体的环形被成形为基本上符合产生的截头圆锥形表面。 环的端部可以是间隔开的板的形式，用于提供必要的电容，或者可以由一个或多个分立元件电容器连接。

公开(公告)号：US5144241A

公开(公告)日：1992-09-01

申请号：US567739

申请日：1990-08-15

Applicant: Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

Inventor： Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

IPC: G01R33/32 ,  A61B5/055 ,  G01R33/34 ,  G01R33/343

CPC classification number: G01R33/343

Abstract: A circularly polarizing RF antenna suitable for use in an MRI apparatus for obtaining tomograms of an examination subject includes two antenna systems, each having a winding, having two lateral legs and a middle leg, and a return path which form a resonant circuit in combination with one or more resonant capacitors. The middle legs of the two antenna systems are disposed so that they cross one another. One or more decoupling capacitors are provided between the two antenna systems. A circularly polarizing antenna for a magnetic resonance imaging system is thus obtained having a magnetic field vector in the imaging region which rotates in planes parallel to the pole surfaces of a C-shaped magnet which generates the fundamental magnetic field in the magnetic resonance imaging apparatus.

Abstract translation: 适用于MRI装置中用于获取检查对象的断层图像的圆偏振RF天线包括两个天线系统，每个天线系统具有绕组，具有两个横向腿和中间支腿，以及一个形成谐振电路的返回路径，与 一个或多个谐振电容器。 两个天线系统的中间腿被布置成使得它们彼此交叉。 在两个天线系统之间提供一个或多个去耦电容器。 因此，获得了一种用于磁共振成像系统的圆极化天线，其在成像区域中具有磁场矢量，该磁场矢量在平行于在磁共振成像装置中产生基本磁场的C形磁体的极面平行的平面中旋转。

公开(公告)号：US09935350B2

公开(公告)日：2018-04-03

申请号：US14972304

申请日：2015-12-17

Applicant: Ralph Oppelt

Inventor： Ralph Oppelt

IPC: H01P5/02 ,  H01P1/22 ,  H01P5/12

CPC classification number: H01P1/225

Abstract: A device for damping a standing wave on a waveguide carrying a signal is provided. The device includes at least one pair of an impedance-up-transforming and an impedance-down-transforming Boucherot bridge is connected into the waveguide. The two Boucherot bridges bring about locally increased impedances and inductance values, with the result that a significantly improved standing wave suppression or damping is obtained. The down-transforming Boucherot bridge is connected directly behind the up-transforming bridge, with the result that down-transformation to the original impedance of the waveguide again can be carried out and a signal reflection can thus be avoided.