公开(公告)号：US08055196B2

公开(公告)日：2011-11-08

申请号：US12465147

申请日：2009-05-13

申请人： Stephan Biber ,  Jan Bollenbeck ,  Ralph Oppelt ,  Markus Vester

发明人： Stephan Biber ,  Jan Bollenbeck ,  Ralph Oppelt ,  Markus Vester

IPC分类号： H04B7/00

CPC分类号： G01R33/3664 ,  G01R33/3415 ,  G01R33/3607 ,  G01R33/3621 ,  G01R33/3635

摘要： An arrangement for transmitting magnetic resonance signals, with a transmission link that connects a local coil with a receiver, has a first channel of the local coil with a first single antenna to acquire a first magnetic resonance signal, as well as a first mixer connected with the first single antenna. The first mixer forms an intermediate-frequency first signal from the supplied first magnetic resonance signal. A second channel of the local coil has a second single antenna to acquire a second magnetic resonance signal, as well as a second mixer connected with the second single antenna. The second mixer forms an intermediate-frequency second signal from the supplied second magnetic resonance signal. The local coil has a device for signal combination that, by frequency multiplexing, that combines the intermediate-frequency first signal of the first channel and the intermediate-frequency second signal of the second channel so that it arrives at the receiver via the transmission path. The receiver has an A/D converter at which one of the transmitted intermediate-frequency signals of an associated channel arrives in order to be sampled with a sampling frequency for digitization. For frequency conversion, a first local oscillator frequency is connected at the first mixer and a second local oscillator frequency is connected at the second mixer. the first and second local oscillator frequencies are selected such that intermediate-frequencies formed by the frequency conversion are mirror-symmetrical relative to the sampling frequency of the A/D converter.

摘要翻译： 用于传输磁共振信号的装置，具有将本地线圈与接收器连接的传输链路，具有本地线圈的第一通道和第一单个天线以获取第一磁共振信号，以及与第 第一单天线。 第一混频器从所提供的第一磁共振信号形成中频第一信号。 本地线圈的第二通道具有用于获取第二磁共振信号的第二单个天线，以及与第二单个天线连接的第二混频器。 第二混频器从所提供的第二磁共振信号形成中频第二信号。 本地线圈具有用于信号组合的装置，通过频率复用，组合第一通道的中频第一信号和第二通道的中频第二信号，使得其经由传输路径到达接收器。 接收机具有A / D转换器，在该A / D转换器中，相关信道的所发送的中频信号中的一个到达，以便以用于数字化的采样频率进行采样。 对于频率转换，在第一混频器处连接第一本地振荡器频率，在第二混频器处连接第二本地振荡器频率。 选择第一和第二本地振荡器频率，使得由频率变换形成的中频相对于A / D转换器的采样频率是镜像对称的。

公开(公告)号：US07890070B2

公开(公告)日：2011-02-15

申请号：US11937552

申请日：2007-11-09

申请人： Jan Bollenbeck ,  Ralph Oppelt

发明人： Jan Bollenbeck ,  Ralph Oppelt

IPC分类号： H04B1/18 ,  H04B7/00

CPC分类号： H03J3/185 ,  H03H11/1291

摘要： A filter circuit arrangement for filtering of a radio-frequency signal has a first tunable filter and a phase regulation loop in order to hold the first tunable filter to a transmission phase constant relative to the frequency of the radio-frequency signal. The filter circuit arrangement has a second tunable filter arranged parallel to the first tunable filter in the phase regulation loop. The first tunable filter and the second tunable filter exhibit different attenuation characteristics and are fashioned and connected within the phase regulation loop so that: a capture range of the filter circuit arrangement, in which a tuning of the phase regulation loop to a radio-frequency signal to be filtered is possible is dominated by the attenuation characteristic of the second tunable filter, and so that the transmission behavior of the filter circuit arrangement in operation is dominated by the attenuation characteristic of the first tunable filter, given a tuned phase regulation loop. A circuit arrangement for generation of a local oscillator signal has an oscillation generator and a filter circuit arrangement as described above arranged downstream of the oscillation generator.

摘要翻译： 用于对射频信号进行滤波的滤波器电路装置具有第一可调滤波器和相位调节环路，以便将第一可调滤波器保持在相对于射频信号的频率的传输相位恒定。 滤波器电路装置具有在相位调节环路中平行于第一可调谐滤波器布置的第二可调谐滤波器。 第一可调谐滤波器和第二可调谐滤波器具有不同的衰减特性，并且在相位调节环路内形成和连接，使得：滤波器电路装置的捕获范围，其中相调节环路调谐到射频信号 要被滤波的是可能的，由第二可调谐滤波器的衰减特性所支配，并且使得在给定调谐相位调节环路的情况下，在操作中的滤波器电路装置的传输行为由第一可调谐滤波器的衰减特性支配。 用于产生本地振荡器信号的电路装置具有布置在振荡发生器下游的振荡发生器和如上所述的滤波器电路装置。

公开(公告)号：US07761060B2

公开(公告)日：2010-07-20

申请号：US11250824

申请日：2005-10-14

申请人： Ralph Oppelt

发明人： Ralph Oppelt

IPC分类号： H04B1/00 ,  H04B7/00

CPC分类号： H04B1/66 ,  G01R33/3621 ,  G01R33/3692

摘要： In a method and apparatus for transmission of signals, an input signal is supplied to at least one dynamic compressor and the dynamics of the signal is compressed by the dynamic compressor with a degree of compression. The compressed signal is subsequently adapted, in particular limited, in terms of its frequency bandwidth dependent on the degree of compression, such as directly dependent on the degree of compression or dependent on a reference value directly associated with the degree of compression, such as the input level of the signal before the dynamic compressor.

摘要翻译： 在用于传输信号的方法和装置中，输入信号被提供给至少一个动态压缩器，并且动态压缩器以一定程度的压缩将信号的动力学压缩。 压缩信号随后适应，特别是根据其频率带宽取决于压缩程度，例如直接取决于压缩程度或依赖于与压缩程度直接相关的参考值，例如 动态压缩机前的信号输入电平。

公开(公告)号：US20080136473A1

公开(公告)日：2008-06-12

申请号：US11937552

申请日：2007-11-09

申请人： Jan Bollenbeck ,  Ralph Oppelt

发明人： Jan Bollenbeck ,  Ralph Oppelt

IPC分类号： H03L7/081 ,  H03K5/00 ,  H03L7/08 ,  H03L7/06

CPC分类号： H03J3/185 ,  H03H11/1291

摘要： A filter circuit arrangement for filtering of a radio-frequency signal has a first tunable filter and a phase regulation loop in order to hold the first tunable filter to a transmission phase constant relative to the frequency of the radio-frequency signal. The filter circuit arrangement has a second tunable filter arranged parallel to the first tunable filter in the phase regulation loop. The first tunable filter and the second tunable filter exhibit different attenuation characteristics and are fashioned and connected within the phase regulation loop so that: a capture range of the filter circuit arrangement, in which a tuning of the phase regulation loop to a radio-frequency signal to be filtered is possible is dominated by the attenuation characteristic of the second tunable filter, and so that the transmission behavior of the filter circuit arrangement in operation is dominated by the attenuation characteristic of the first tunable filter, given a tuned phase regulation loop. A circuit arrangement for generation of a local oscillator signal has an oscillation generator and a filter circuit arrangement as described above arranged downstream of the oscillation generator.

摘要翻译： 用于对射频信号进行滤波的滤波器电路装置具有第一可调滤波器和相位调节环路，以便将第一可调滤波器保持在相对于射频信号的频率的传输相位恒定。 滤波器电路装置具有在相位调节环路中平行于第一可调谐滤波器布置的第二可调谐滤波器。 第一可调谐滤波器和第二可调谐滤波器具有不同的衰减特性，并且在相位调节环路内形成和连接，使得：滤波器电路装置的捕获范围，其中相调节环路调谐到射频信号 要被滤波的是可能的，由第二可调谐滤波器的衰减特性所支配，并且使得在给定调谐相位调节环路的情况下，在操作中的滤波器电路装置的传输行为由第一可调滤波器的衰减特性支配。 用于产生本地振荡器信号的电路装置具有布置在振荡发生器下游的振荡发生器和如上所述的滤波器电路装置。

公开(公告)号：US20060100860A1

公开(公告)日：2006-05-11

申请号：US11250824

申请日：2005-10-14

申请人： Ralph Oppelt

发明人： Ralph Oppelt

IPC分类号： G10L19/00

CPC分类号： H04B1/66 ,  G01R33/3621 ,  G01R33/3692

摘要： In a method and apparatus for transmission of signals, an input signal is supplied to at least one dynamic compressor and the dynamics of the signal is compressed by the dynamic compressor with a degree of compression. The compressed signal is subsequently adapted, in particular limited, in terms of its frequency bandwidth dependent on the degree of compression, such as directly dependent on the degree of compression or dependent on a reference value directly associated with the degree of compression, such as the input level of the signal before the dynamic compressor.

摘要翻译： 在用于传输信号的方法和装置中，输入信号被提供给至少一个动态压缩器，并且动态压缩器以一定程度的压缩将信号的动力学压缩。 压缩信号随后适应，特别是根据其频率带宽取决于压缩程度，例如直接取决于压缩程度或依赖于与压缩程度直接相关的参考值，例如 动态压缩机前的信号输入电平。

公开(公告)号：US06580317B1

公开(公告)日：2003-06-17

申请号：US09672630

申请日：2000-09-28

申请人： Ralph Oppelt

发明人： Ralph Oppelt

IPC分类号： H03F136

CPC分类号： H03F3/45475 ,  H03F1/26 ,  H03F1/34 ,  H03F1/56 ,  H03F2200/372

摘要： An amplifier includes a first broadband amplifier element (20) having a first and a second input (21 and 22, respectively) and also a first output (23). The first output (23) is fed back via a first and a second negative feedback path (30 and 40, respectively) to the first and second input (21 and 22, respectively). The first negative feedback path (30) includes a controlled current source (31), which brings about a reduction in the noise contribution of the second negative feedback path (40) and also a real finite input impedance.

摘要翻译： 放大器包括具有第一和第二输入（分别为21和22）以及第一输出（23）的第一宽带放大器元件（20）。 第一输出（23）经由第一和第二负反馈路径（分别为30和40）反馈到第一和第二输入端（21和22）。 第一负反馈路径（30）包括受控电流源（31），其导致第二负反馈路径（40）的噪声贡献的降低以及实际有限输入阻抗。

公开(公告)号：US06269052B1

公开(公告)日：2001-07-31

申请号：US09375069

申请日：1999-08-16

申请人： Ralph Oppelt

发明人： Ralph Oppelt

IPC分类号： H04B140

CPC分类号： G01S7/52017 ,  G01N29/11 ,  G01N29/34 ,  G01N29/36 ,  G01N2291/0231 ,  G01N2291/044 ,  H04R3/02 ,  Y10S367/903

摘要： The circuit and the method serve to transmit a transmission signal to a transducer and to receive a reception signal from the transducer. The transmitter and the receiver are each alternatively coupled to the transducer and decoupled from one another. The coupling and decoupling is thereby achieved by a total of three nonlinear two-terminal networks (Z1, Z2, Z3). The transmitter is connected to the transducer via a bipolar voltage limiter and the receiver is connected to the transducer via a bipolar current limiter.

摘要翻译： 电路和方法用于将传输信号传送到换能器并从换能器接收接收信号。 发射器和接收器各自可选地耦合到换能器并且彼此分离。 因此，通过总共三个非线性两端网络（Z1，Z2，Z3）实现耦合和去耦。 变送器通过双极性限压器连接到换能器，接收器通过双极限流器连接到换能器。

公开(公告)号：US5724312A

公开(公告)日：1998-03-03

申请号：US632815

申请日：1996-04-17

申请人： Ralph Oppelt

发明人： Ralph Oppelt

IPC分类号： B06B1/02 ,  H03G1/00 ,  H03G3/00 ,  G01S7/526

CPC分类号： B06B1/0207 ,  H03G1/0064 ,  H03G3/00

摘要： An ultrasound transducer head that contains at least one transducer element, which receives ultrasound signals and converts them into electrical receive signals, and an amplifier device, which electrically amplifies the receive signals of the transducer element. The amplifier device contains at least one capacitive component, preferably a controllable capacitive diode. The gain of the amplifier device can be varied as a function of the capacitance of the capacitive component. A virtually loss-free gain is obtained over a large dynamic response range.

摘要翻译： 一种超声波换能器头，其包含至少一个接收超声信号并将其转换成电接收信号的换能器元件，以及电放大换能器元件的接收信号的放大器装置。 放大器装置包含至少一个电容部件，优选地是可控制的电容二极管。 放大器装置的增益可以作为电容部件的电容的函数而变化。 在大的动态响应范围内可以获得几乎无损的增益。

公开(公告)号：US5574372A

公开(公告)日：1996-11-12

申请号：US374028

申请日：1995-01-18

申请人： Michael Moritz ,  Ralph Oppelt ,  Wilhelm Duerr

发明人： Michael Moritz ,  Ralph Oppelt ,  Wilhelm Duerr

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

CPC分类号： A61B5/055 ,  G01R33/422

摘要： 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.

摘要翻译： 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：US5200701A

公开(公告)日：1993-04-06

申请号：US761650

申请日：1991-09-18

申请人： Horst Siebold ,  Ralph Oppelt ,  Guenter Ries

发明人： Horst Siebold ,  Ralph Oppelt ,  Guenter Ries

IPC分类号： G01R33/385

CPC分类号： G01R33/385

摘要： A magnetic resonance imaging apparatus for producing tomograms has a C-magnet with substantially planar pole faces for generating a magnetic field in the direction of the z-axis of a Cartesian coordinate system, for examining a human body having a body axis extending in the direction x-axis, the region to be examined being disposed between the pole pieces, gradient coils substantially parallel to the pole pieces, and a regulator for controlling the gradient currents of the gradient coils using the magnetic flux associated with each gradient coil as the measure value effecting such control. The gradient currents are adjusted dependent on disturbances in the magnetic flux which are caused by eddy currents and saturation effects in the ferromagnetic material in the proximity of the pole faces. Such a regulator can also be used in combination with gradient coils for generating a gradient in the z-direction for compensating for transient inhomogeneities in the main magnetic field.

摘要翻译： 用于产生断层图像的磁共振成像装置具有C形磁体，其具有基本上平面的极面，用于在笛卡尔坐标系的z轴方向上产生磁场，用于检查具有沿着方向延伸的主体轴的人体 x轴，待检查的区域设置在极靴之间，基本上平行于极靴的梯度线圈和用于使用与每个梯度线圈相关联的磁通量作为测量值来控制梯度线圈的梯度电流的调节器 实现这种控制。 梯度电流根据在磁极附近的铁磁材料中的涡流和饱和效应引起的磁通量的扰动来调节。 这种调节器也可以与梯度线圈组合使用，用于在z方向上产生梯度以补偿主磁场中的瞬态不均匀性。