公开(公告)号：US5200703A

公开(公告)日：1993-04-06

申请号：US764349

申请日：1991-09-23

申请人： Walter Popp ,  Karl-Ulrich Erlenkamp ,  Peter Feld ,  Norbert Rietsch ,  Markus Vester

发明人： Walter Popp ,  Karl-Ulrich Erlenkamp ,  Peter Feld ,  Norbert Rietsch ,  Markus Vester

IPC分类号： A61B5/055 ,  G01R33/38 ,  G01R33/381 ,  G01R33/385 ,  G01R33/422 ,  H03H7/01 ,  H04B15/02

CPC分类号： H03H7/1758 ,  G01R33/385 ,  G01R33/422 ,  H03H7/0115 ,  H03H7/1733 ,  H03H7/1766 ,  H03H7/1775 ,  H04B15/02 ,  H03H2001/0085

摘要： An anti-interference filter for radio-shielding a feeder to a gradient coil in a nuclear magnetic resonance imaging apparatus is constructed as a band elimination (band rejection) filter for the operating frequency of the nuclear magnetic resonance imaging apparatus. The anti-interference filter can be in the form of a directionally symmetrical quadrupole having two input terminals and two output terminals. A first input terminal and a first output terminal are introducible into the feeder to the gradient coil, and a second input terminal and a second output terminal are connected to a conductor at reference potential. A number of blocking circuits are arranged in series between the first input terminal and the first output terminal. A number acceptor circuits are arranged between the input terminals, between the junctions of the blocking circuits and the reference potential conductor, and between the output terminals. The number of acceptor circuits is one more than the number of blocking circuits.

摘要翻译： 用于对核磁共振成像设备中的梯形线圈进给器进行放射线屏蔽的抗干扰滤波器被构造为用于核磁共振成像设备的工作频率的带除（带阻）滤波器。 抗干扰滤波器可以是具有两个输入端和两个输出端的定向对称四极的形式。 第一输入端子和第一输出端子被引入到馈电器中到梯形线圈，并且第二输入端子和第二输出端子连接到参考电位的导体。 多个阻塞电路串联布置在第一输入端和第一输出端之间。 在输入端子之间，阻塞电路的接点和参考电位导体之间以及输出端子之间布置有数个受电子电路。 受体电路的数量比阻塞电路的数量多一个。

公开(公告)号：US5208537A

公开(公告)日：1993-05-04

申请号：US788593

申请日：1991-11-06

申请人： Norbert Rietsch ,  Markus Vester ,  Horst Kroeckel

发明人： Norbert Rietsch ,  Markus Vester ,  Horst Kroeckel

IPC分类号： H01P5/08 ,  A61B5/055 ,  G01R33/36 ,  H03H7/40

CPC分类号： G01R33/3628

摘要： In a method for matching a transmission/reception antenna in a nuclear magnetic resonance imaging apparatus to the impedance of a high-frequency system which feeds the antenna, a directional coupler is used for acquiring respective signals corresponding to a forward voltage wave supplied to the antenna, and the associated return voltage wave. The amplitudes of the forward and return waves are calculated in a controller for all matching conditions of a transformation network, the transformation network being interconnected between the high frequency system and the antenna. When a tomogram is to be produced, the transformation network is set so that the antenna is matched as best as is possible to the high-frequency system. The same method can be used for matching an antenna which is only used for reception when producing tomograms.

摘要翻译： 在将核磁共振成像装置中的发送接收天线与馈送天线的高频系统的阻抗进行匹配的方法中，使用定向耦合器来取得与提供给天线的正向电压波对应的各信号 ，以及相关的返回电压波。 转换网络的所有匹配条件的控制器计算正向和返回波的幅度，变换网络在高频系统和天线之间互连。 当要产生断层图像时，转换网络被设置为使得天线能够尽可能地匹配到高频系统。 可以使用相同的方法来匹配仅在生成断层图像时用于接收的天线。

公开(公告)号：US07808243B2

公开(公告)日：2010-10-05

申请号：US12281494

申请日：2007-01-22

申请人： Peter Feld ,  Georg Rauh ,  Wilfried Schnell ,  Markus Vester

发明人： Peter Feld ,  Georg Rauh ,  Wilfried Schnell ,  Markus Vester

IPC分类号： G01V3/00

CPC分类号： H01P1/383

摘要： A circulator has a ferrite, and the circulator is arranged in the vicinity of a device that produces a static magnetic field in the environment surrounding the device, this static magnetic field giving the circulator a non-reciprocal behavior, with respect to circulation of energy among the gates of the circulator, as a result of interaction of the ferrite with the static magnetic field. A magnetic resonance apparatus embodies such a circulator, and the basic field magnet of this magnetic resonance apparatus generates the static magnetic field.

摘要翻译： 循环器具有铁氧体，并且循环器布置在围绕设备的环境中产生静态磁场的装置附近，该静磁场相对于循环器中的能量循环而产生不可逆的行为 由于铁氧体与静磁场的相互作用，循环器的栅极。 磁共振装置体现这种环行器，并且该磁共振装置的基本场磁体产生静磁场。

公开(公告)号：US6160453A

公开(公告)日：2000-12-12

申请号：US220111

申请日：1998-12-23

申请人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

发明人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

IPC分类号： H03F3/26 ,  H03F3/04

CPC分类号： H03F3/265

摘要： A high-frequency power amplifier has a high-frequency input, a high-frequency output and at least one power transistor connected therebetween. The power transistor has a first electrode serving as a control input, a cooling terminal connected to a second electrode and a third electrode. The third electrode is connected to a high-frequency reference potential conductor and the high-frequency reference potential conductor is connected in terms of high-frequency to the second electrode. An input signal applied to the high-frequency input is coupled out as an output signal at the high-frequency output.

摘要翻译： 高频功率放大器具有连接在其间的高频输入，高频输出和至少一个功率晶体管。 功率晶体管具有用作控制输入的第一电极，连接到第二电极和第三电极的冷却端子。 第三电极连接到高频参考电位导体，高频参考电位导体以高频率连接到第二电极。 施加到高频输入的输入信号作为高频输出端的输出信号被耦合出来。

公开(公告)号：US06281755B1

公开(公告)日：2001-08-28

申请号：US09221049

申请日：1998-12-28

申请人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

发明人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

IPC分类号： H03F3191

CPC分类号： H03F1/565 ,  H03F3/191 ,  H03F2200/111

摘要： A high-frequency power amplifier for feeding an antenna of a nuclear magnetic resonance tomography apparatus has at least one amplifier stage that can emit a maximum output power within a first frequency band. Circuitry for frequency-dependently altering the maximum output power is connected to the amplifier stage, whereby the maximum output power within a second frequency band, that is higher than the first frequency band is higher than within the first frequency band.

摘要翻译： 用于馈送核磁共振断层摄影装置的天线的高频功率放大器具有至少一个可在第一频带内发射最大输出功率的放大器级。 用于频率依赖性地改变最大输出功率的电路连接到放大器级，由此在比第一频带高的第二频带内的最大输出功率高于第一频带内的最大输出功率。

公开(公告)号：US06195031B1

公开(公告)日：2001-02-27

申请号：US09221048

申请日：1998-12-28

申请人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

发明人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

IPC分类号： H03M136

CPC分类号： H03M1/188

摘要： An analog-to-digital converter circuit for digitalizing a high-frequency signal with large dynamics has a first analog-to-digital converter and a second analog-to-digital converter connected in parallel, a level converter connected to one of the two analog-to-digital converters, a level recognition element for determining a level range in which the high-frequency signal lies and for generating a control signal dependent on the level range, and a correction memory that is connected to the level recognition element, the correction memory having address inputs connected to outputs of the analog-to-digital converters. The control signal is used as a selection criterion which identifies which analog-to-digital converter address data are taken from for producing a digital output signal, the digital output signal being linearized according to a characteristic of the selected analog-to-digital converter in order to correct for distortion arising in the selected converter. The overall analog-to-digital converter circuit thus has an overall linear characteristic, even as the input signal varies between low and high amplitudes.

摘要翻译： 用于以大动态数字化高频信号的模数转换器电路具有并联连接的第一模数转换器和第二模数转换器，电平转换器连接到两个模拟 数字转换器，用于确定高频信号所在的电平范围并用于产生取决于电平范围的控制信号的电平识别元件，以及连接到电平识别元件的校正存储器，校正 具有连接到模数转换器的输出的地址输入的存储器。 该控制信号用作选择标准，其标识从哪个模拟 - 数字转换器地址数据获取用于产生数字输出信号，数字输出信号根据所选择的模数转换器的特性被线性化 以纠正所选转换器中出现的失真。 因此，总体模数转换器电路具有总体线性特性，即使输入信号在低和高幅度之间变化。

公开(公告)号：US20090051363A1

公开(公告)日：2009-02-26

申请号：US12281494

申请日：2007-01-22

申请人： Peter Feld ,  Georg Rauh ,  Wilfried Schnell ,  Markus Vester

发明人： Peter Feld ,  Georg Rauh ,  Wilfried Schnell ,  Markus Vester

IPC分类号： G01V3/12 ,  H01P1/38

CPC分类号： H01P1/383

摘要： A circulator has a ferrite, and the circulator is arranged in the vicinity of a device that produces a static magnetic field in the environment surrounding the device, this static magnetic field giving the circulator a non-reciprocal behavior, with respect to circulation of energy among the gates of the circulator, as a result of interaction of the ferrite with the static magnetic field. A magnetic resonance apparatus embodies such a circulator, and the basic field magnet of this magnetic resonance apparatus generates the static magnetic field.

摘要翻译： 循环器具有铁氧体，并且循环器布置在围绕设备的环境中产生静态磁场的装置附近，该静磁场相对于循环器中的能量循环而产生不可逆的行为 由于铁氧体与静磁场的相互作用，循环器的栅极。 磁共振装置体现这种环行器，并且该磁共振装置的基本场磁体产生静磁场。

公开(公告)号：US06297637B1

公开(公告)日：2001-10-02

申请号：US09221810

申请日：1998-12-29

申请人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

发明人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

IPC分类号： G01V300

CPC分类号： G01R33/3621

摘要： A high-frequency receiver with an analog input part has at least one analog mixer stage, this mixer stage being operable with an injection frequency, and a following digitalization stage. The digitalization stage includes an analog-to-digital converter for digitalizing a signal emitted by the analog input part with a sampling rate prescribed by a sampling frequency. A signal generator for generating the injection frequency or the sampling frequency is connected to the mixer stage and to the analog-to-digital converter, this signal generator generating the injection frequency or the sampling frequency only as a whole number multiple of a basic frequency.

摘要翻译： 具有模拟输入部分的高频接收器具有至少一个模拟混频器级，该混频器级可以以注入频率和随后的数字化级工作。 数字化级包括用于以由采样频率规定的采样率数字化由模拟输入部分发射的信号的模拟 - 数字转换器。 用于产生喷射频率或采样频率的信号发生器连接到混频器级和模拟 - 数字转换器，该信号发生器仅产生基本频率的整数倍的注入频率或采样频率。

公开(公告)号：US06285305B1

公开(公告)日：2001-09-04

申请号：US09538358

申请日：2000-03-29

申请人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

发明人： Peter Feld ,  Horst Kroeckel ,  Markus Vester

IPC分类号： H03M162

CPC分类号： H03M1/188

摘要： An analog-to-digital converter circuit has pre-sample and hold circuit for acquiring and temporarily storing a supplied analog input signal, and for outputting the temporarily stored input signal, at least two signal paths, which are arranged downstream relative to the pre-sample and hold circuit and which are switched in parallel with one another, the temporarily stored input signal sample from the pre-sample and hold circuit being subjected to respective fixed amplifications, which are different from one another, in said signal paths and a selection circuit arranged downstream relative to the signal paths for through-connecting only one of the signal paths, dependent on the respective signal levels, to an analog-to-digital converter that is arranged downstream relative to the selection circuit.

摘要翻译： 模拟 - 数字转换器电路具有用于获取和临时存储所提供的模拟输入信号的预采样和保持电路，并且用于输出临时存储的输入信号至少两个信号路径， 采样和保持电路并且彼此并联切换，来自预采样和保持电路的临时存储的输入信号采样在所述信号路径中经受彼此不同的相应的固定放大和选择电路 布置在相对于信号路径的下游，用于仅将信号路径中的一个根据相应的信号电平连接到相对于选择电路布置在下游的模拟 - 数字转换器。

公开(公告)号：US10393845B2

公开(公告)日：2019-08-27

申请号：US15368607

申请日：2016-12-03

申请人： Steffen Schröter ,  Jan Bollenbeck ,  Matthias Fenchel ,  Peter Speier ,  Markus Vester

发明人： Steffen Schröter ,  Jan Bollenbeck ,  Matthias Fenchel ,  Peter Speier ,  Markus Vester

IPC分类号： G01R33/36 ,  G01R33/565

摘要： A transmitter for pilot tone navigation in a magnetic resonance tomography system includes a power supply and an antenna. The transmitter is configured to transmit a pilot tone signal via the antenna. The transmitter also includes a decoupling element in order to protect a transmitter output from signals that the antenna receives with excitation pulses of the magnetic resonance tomography system during a magnetic resonance tomography. In a method, movement-dependent changes to the pilot tone signal of the transmitter are identified by a controller of the magnetic resonance tomography system.