公开(公告)号：US06822445B2

公开(公告)日：2004-11-23

申请号：US10256034

申请日：2002-09-26

申请人： Markus Vester

发明人： Markus Vester

IPC分类号： G01V300

CPC分类号： G01R33/3621 ,  G01R33/3692

摘要： A magnetic resonance signal is compressed, so that high signal values are over-proportionally reduced, and is then supplied to an analog-to-digital converter wherein it is digitized. After transmission to reception device, the magnetic resonance signal is expanded, so that high signal values are over-proportionally amplified.

摘要翻译： 磁共振信号被压缩，使得高信号值被过比例地减小，然后被提供给其数字化的模数转换器。 在发送到接收装置之后，磁共振信号被扩展，使得高信号值被过度放大。

公开(公告)号：US06791322B2

公开(公告)日：2004-09-14

申请号：US10262328

申请日：2002-10-01

申请人： Markus Vester

发明人： Markus Vester

IPC分类号： G01V300

CPC分类号： H04B5/02 ,  G01R33/3692 ,  H04B7/0802

摘要： In a reception coil, a carrier signal is frequency-modulated around a carrier frequency with a modulation signal corresponding to an analog magnetic resonance signal. The frequency-modulated carrier signal is wirelessly transmitted from the reception coil to a reception circuit that is spatially separated from the reception coil. The frequency-modulated carrier signal is demodulated in the reception circuit in order to reacquire the modulation signal.

摘要翻译： 在接收线圈中，通过对应于模拟磁共振信号的调制信号，以载波频率对载波信号进行频率调制。 频率调制载波信号从接收线圈无线发送到与接收线圈在空间上分离的接收电路。 调频载波信号在接收电路中进行解调，以重新获取调制信号。

公开(公告)号：US06590395B2

公开(公告)日：2003-07-08

申请号：US10180416

申请日：2002-06-26

申请人： Arne Reykowski ,  Markus Vester

发明人： Arne Reykowski ,  Markus Vester

IPC分类号： G01V300

CPC分类号： G01R33/341 ,  Y10S439/95

摘要： A connector device for a sensor or actuator is composed of two terminal elements releasably connected to one another. A first of these terminal elements including a first electrical conductor that is connected to the sensor or actuator and a second of these terminal elements including a second electrical conductor that is connectible to an evaluation unit. The two electrical conductors are fashioned as coil systems in the terminal elements that enable signal transmission by inductive coupling given a connection of the two terminal elements. Each of the coil systems is formed of at least two series-connected coils that have oppositely directed windings and that are dimensioned such that the sum of voltages induced in the coils by a uniform electromagnetic field yields zero for each of the coil systems. The present connector device can be advantageously utilized for the connection of surface coils to the system of a magnetic resonance system and enables a complete hermetic sealing of the surface coils.

摘要翻译： 用于传感器或致动器的连接器装置由可释放地彼此连接的两个端子元件组成。 这些端子元件中的第一个包括连接到传感器或致动器的第一电导体，以及包括可连接到评估单元的第二电导体的这些端子元件中的第二个。 两个电导体被形成为端子元件中的线圈系统，通过给定两个端子元件的连接使得能够通过感应耦合进行信号传输。 每个线圈系统由至少两个串联连接的线圈形成，该线圈具有相对定向的绕组，其尺寸使得通过均匀电磁场在线圈中感应的电压之和为每个线圈系统产生零。 本连接器装置可以有利地用于将表面线圈连接到磁共振系统的系统，并且能够实现表面线圈的完全密封。

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：US10663543B2

公开(公告)日：2020-05-26

申请号：US15951156

申请日：2018-04-11

申请人： Stephan Biber ,  Jan Bollenbeck ,  Sven Heggen ,  Martin Nisznansky ,  Markus Vester

发明人： Stephan Biber ,  Jan Bollenbeck ,  Sven Heggen ,  Martin Nisznansky ,  Markus Vester

IPC分类号： G01V3/00 ,  G01R33/36 ,  G01R33/3415

摘要： A device for recovering a temporal reference in a free-running magnetic resonance tomography (MRT) receive chain includes a time reference encoder and a time reference decoder. The time reference encoder is configured to generate a modulation signal as a function of a reference clock, where the modulation signal is configured for a correlation with a temporal resolution less than a maximum predetermined phase deviation and a maximum that may clearly be identified. The time reference decoder is configured to receive, via the first signal input, a receive signal as a function of the modulation signal, perform a correlation with a reference signal, and generate a signal as a function of a temporal reference of the modulation signal in the receive signal in relation to the reference signal.

公开(公告)号：US10295624B2

公开(公告)日：2019-05-21

申请号：US13918461

申请日：2013-06-14

申请人： Elfar Adalsteinsson ,  Luca Daniel ,  Bastien Guerin ,  Zohaib Mahmood ,  Markus Vester ,  Lawrence Wald

发明人： Elfar Adalsteinsson ,  Luca Daniel ,  Bastien Guerin ,  Zohaib Mahmood ,  Markus Vester ,  Lawrence Wald

IPC分类号： G01V3/00 ,  G01R33/36 ,  G01R33/561

摘要： A method of determining a decoupling matrix of a decoupling system for an array of coils of a parallel transmission magnetic resonance imaging (MRI) system includes obtaining impedance matrix data for the array of coils without the decoupling system, determining, based on the impedance matrix data for the array of coils, an objective function representative of deviation from a decoupled operating condition for the array of coils in which the array of coils are decoupled via the decoupling system, and defining, with a processor, a decoupling matrix representative of a set of impedances of the decoupling system with an iterative procedure that optimizes elements of the decoupling matrix to minimize the objective function and reach the decoupled operating condition.

公开(公告)号：US09983280B2

公开(公告)日：2018-05-29

申请号：US14249926

申请日：2014-04-10

申请人： Jia Heng Tan ,  Tong Tong ,  Markus Vester ,  JianMin Wang

发明人： Jia Heng Tan ,  Tong Tong ,  Markus Vester ,  JianMin Wang

IPC分类号： G01R33/36 ,  G01R33/34 ,  G01R33/341

CPC分类号： G01R33/3657 ,  G01R33/341

摘要： A local coil for an MRI system includes a signal antenna to receive a magnetic resonance signal and a tuning/detuning circuit to subject the signal antenna part to switch control according to a control signal. The tuning/detuning circuit is connected to the signal antenna part. The tuning/detuning circuit includes a control signal interface, a resonant circuit and an AC/DC conversion circuit. The control signal interface receives the control signal. The resonant circuit includes a diode. The AC/DC conversion circuit converts an alternating current generated by an electromagnetic wave to a direct current. The AC/DC conversion circuit is connected in series with the diode. A small detuning control current may be used, and detuning control circuitry may be reduced.

公开(公告)号：US09817089B2

公开(公告)日：2017-11-14

申请号：US13722606

申请日：2012-12-20

申请人： Stephan Biber ,  Jan Bollenbeck ,  Ralph Oppelt ,  Georg Rauh ,  Wilfried Schnell ,  Markus Vester

发明人： Stephan Biber ,  Jan Bollenbeck ,  Ralph Oppelt ,  Georg Rauh ,  Wilfried Schnell ,  Markus Vester

IPC分类号： G01R33/30 ,  G01R33/3415 ,  G01R33/36 ,  G01R33/563

CPC分类号： G01R33/30 ,  G01R33/3415 ,  G01R33/3664 ,  G01R33/56383

摘要： A selection unit for a magnetic resonance imaging system may be provided. The selection unit electrically connects a first number of electrical terminals to a second number of communication entities. The selection unit is arranged in and/or on a mobile object-support element for moving an examination object which is to be depicted by the magnetic resonance imaging system into a recording position.

公开(公告)号：US09810752B2

公开(公告)日：2017-11-07

申请号：US14483795

申请日：2014-09-11

申请人： Stephan Biber ,  Jan Bollenbeck ,  Markus Vester ,  JianMin Wang

发明人： Stephan Biber ,  Jan Bollenbeck ,  Markus Vester ,  JianMin Wang

IPC分类号： G01R33/341 ,  G01R33/54 ,  G01R33/36 ,  G01R33/385 ,  G01R33/3415

CPC分类号： G01R33/341 ,  G01R33/3415 ,  G01R33/3621 ,  G01R33/3664 ,  G01R33/3852 ,  G01R33/54

摘要： A method and an apparatus for a magnetic resonance imaging system are provided. A type of further processing of signals transmitted by a local coil to a magnetic resonance imaging (MRI) system is determined in dependence on information received in or from the local coil about a local-coil type of the local coil.