公开(公告)号：US10663543B2

公开(公告)日：2020-05-26

申请号：US15951156

申请日：2018-04-11

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

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

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

Abstract: 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

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

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

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

Abstract: 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

Applicant: Jia Heng Tan ,  Tong Tong ,  Markus Vester ,  JianMin Wang

Inventor： Jia Heng Tan ,  Tong Tong ,  Markus Vester ,  JianMin Wang

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

CPC classification number: G01R33/3657 ,  G01R33/341

Abstract: 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

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

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

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

CPC classification number: G01R33/30 ,  G01R33/3415 ,  G01R33/3664 ,  G01R33/56383

Abstract: 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

Applicant: Stephan Biber ,  Jan Bollenbeck ,  Markus Vester ,  JianMin Wang

Inventor： Stephan Biber ,  Jan Bollenbeck ,  Markus Vester ,  JianMin Wang

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

CPC classification number: G01R33/341 ,  G01R33/3415 ,  G01R33/3621 ,  G01R33/3664 ,  G01R33/3852 ,  G01R33/54

Abstract: 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.

公开(公告)号：US20170160367A1

公开(公告)日：2017-06-08

申请号：US15368607

申请日：2016-12-03

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

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

IPC: G01R33/565 ,  G01R33/36

CPC classification number: G01R33/56509 ,  G01R33/3607 ,  G01R33/3614 ,  G01R33/3657 ,  G01R33/3692

Abstract: 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.

公开(公告)号：US20170074953A1

公开(公告)日：2017-03-16

申请号：US15266042

申请日：2016-09-15

Applicant: Nikolaus Demharter ,  Markus Vester ,  Volker Weißenberger

Inventor： Nikolaus Demharter ,  Markus Vester ,  Volker Weißenberger

IPC: G01R33/341 ,  G01R31/06

CPC classification number: G01R33/341 ,  G01R31/06 ,  G01R33/288 ,  G01R33/34046 ,  G01R33/34076 ,  G01R33/36 ,  G01R33/3692

Abstract: A local transmit coil for a magnetic resonance tomograph is provided. The local transmit coil includes a signal transmission device for signal transmission to the magnetic resonance tomograph, and a transmission antenna for generating a magnetic excitation field. The local transmit coil further includes an evaluation device for monitoring a function of the local transmit coil. The evaluation device is configured to transmit a status signal relating to the local transmit coil via the signal transmission device.

Abstract translation: 提供了一种用于磁共振断层扫描仪的局部发射线圈。 局部发射线圈包括用于信号传输到磁共振断层摄影机的信号传输装置和用于产生磁激励场的发射天线。 本地发送线圈还包括用于监视本地发送线圈的功能的评估装置。 评估装置经由信号传输装置发送与本地发送线圈相关的状态信号。

公开(公告)号：US09488706B2

公开(公告)日：2016-11-08

申请号：US13440552

申请日：2012-04-05

Applicant: Markus Vester

Inventor： Markus Vester

IPC: H03F3/24 ,  G01R33/36

CPC classification number: G01R33/3607 ,  G01R33/3614 ,  H03F3/24 ,  H03F2200/324 ,  H03F2200/351

Abstract: A transmitting device for driving a high-frequency antenna of a magnetic-resonance device using a target signal capable of being amplitude-modulated is provided. A number N of similarly embodied amplifier modules, where N is at least two, a signal-conditioning device, and a combining device for combining output signals of the amplifier modules into the target signal are provided. The signal-conditioning device generates N drive signals having a predetermined pulse frequency that consist of pulses having a length dependent on a desired target amplitude and having a phase corresponding to the desired target phase and a frequency corresponding to the desired target frequency. The pulses of the individual drive signals are mutually offset in time by, in each case, 1/N of a pulse period corresponding to the pulse frequency. Each drive signal is fed to an amplifier module.

Abstract translation: 提供一种使用能够进行幅度调制的目标信号来驱动磁共振装置的高频天线的发送装置。 提供了N个类似实施例的放大器模块，其中N是至少两个，信号调节装置和用于将放大器模块的输出信号组合成目标信号的组合装置。 信号调节装置产生具有预定脉冲频率的N个驱动信号，该脉冲频率由具有取决于期望目标幅度的长度的脉冲组成，并且具有对应于期望目标相位的相位和对应于期望目标频率的频率。 各个驱动信号的脉冲在时间上相互偏移，在每种情况下，与脉冲频率相对应的脉冲周期的1 / N。 每个驱动信号被馈送到放大器模块。

公开(公告)号：US20160320465A1

公开(公告)日：2016-11-03

申请号：US15131201

申请日：2016-04-18

Applicant: Klaus Huber ,  Robert Rehner ,  Markus Vester

Inventor： Klaus Huber ,  Robert Rehner ,  Markus Vester

IPC: G01R33/36

CPC classification number: G01R33/3657 ,  G01R33/341

Abstract: An arrangement for detuning a receive antenna, a detunable magnetic resonance coil, and a magnetic resonance device having a detunable magnetic resonance coil are provided. The arrangement includes a receive antenna having at least one first capacitance, wherein radiofrequency signals from a magnetic resonance examination may be received by way of the receive antenna. The arrangement furthermore includes a switchable detuning circuit containing the first capacitance switched to form an oscillating circuit and a first inductance, and a switching device having a first and a second connection point to deliver a voltage between the first and a second connection point, and one or more transistors. The switching device switches the oscillating circuit to a high impedance level with aid of the one or more transistors on delivery of a positive voltage to the first connection point, preventing a radiofrequency signal from being received by way of the receive antenna.

Abstract translation: 提供了一种用于使接收天线失谐的装置，不可恢复的磁共振线圈和具有不可恢复的磁共振线圈的磁共振装置。 该装置包括具有至少一个第一电容的接收天线，其中可以通过接收天线接收来自磁共振检查的射频信号。 该装置还包括可切换的失谐电路，其包含切换以形成振荡电路的第一电容和第一电感，以及具有第一和第二连接点以在第一和第二连接点之间传递电压的开关装置，以及一个 或更多的晶体管。 开关装置在将正电压传送到第一连接点的同时，通过一个或多个晶体管的帮助将振荡电路切换到高阻抗水平，防止射频信号通过接收天线被接收。

公开(公告)号：US20150362578A1

公开(公告)日：2015-12-17

申请号：US14738884

申请日：2015-06-13

Applicant: Stephan Biber ,  Daniel Niederlöhner ,  Andreas Schmidt ,  Markus Vester

Inventor： Stephan Biber ,  Daniel Niederlöhner ,  Andreas Schmidt ,  Markus Vester

IPC: G01R33/565 ,  G01R33/3875 ,  G01R33/48

CPC classification number: G01R33/3875 ,  G01R33/243 ,  G01R33/4828 ,  G01R33/56536

Abstract: In order to enable efficient calculation of shim settings for a magnetic resonance imaging system, a method for magnetic resonance imaging of an object under investigation using a magnetic resonance device is provided. The method includes acquiring first magnetic resonance image data of the object under investigation using the magnetic resonance device. The method also includes segmenting the first magnetic resonance image data into at least two material classes, calculating a B0 map based on the segmented first magnetic resonance image data and based on susceptibility values of the at least two material classes, and calculating shim settings based on the calculated B0 map. The method also includes acquiring second magnetic resonance image data of the object under investigation using the magnetic resonance device. The acquisition of the second magnetic resonance image data is undertaken using the calculated shim settings.

Abstract translation: 为了能够有效地计算磁共振成像系统的垫片设置，提供了一种使用磁共振装置对被研究对象进行磁共振成像的方法。 该方法包括使用磁共振装置获取被研究对象的第一磁共振图像数据。 该方法还包括将第一磁共振图像数据分成至少两种材料类别，基于分割的第一磁共振图像数据计算B0图，并且基于至少两种材料类别的磁化率值，以及基于 计算出B0图。 该方法还包括使用磁共振装置获取被研究对象的第二磁共振图像数据。 使用计算的垫片设置进行第二磁共振图像数据的采集。