公开(公告)号：US09488706B2

公开(公告)日：2016-11-08

申请号：US13440552

申请日：2012-04-05

申请人： Markus Vester

发明人： Markus Vester

IPC分类号： H03F3/24 ,  G01R33/36

CPC分类号： G01R33/3607 ,  G01R33/3614 ,  H03F3/24 ,  H03F2200/324 ,  H03F2200/351

摘要： 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.

摘要翻译： 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

申请人： Klaus Huber ,  Robert Rehner ,  Markus Vester

发明人： Klaus Huber ,  Robert Rehner ,  Markus Vester

IPC分类号： G01R33/36

CPC分类号： G01R33/3657 ,  G01R33/341

摘要： 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.

摘要翻译： 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

申请人： Stephan Biber ,  Daniel Niederlöhner ,  Andreas Schmidt ,  Markus Vester

发明人： Stephan Biber ,  Daniel Niederlöhner ,  Andreas Schmidt ,  Markus Vester

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

CPC分类号： G01R33/3875 ,  G01R33/243 ,  G01R33/4828 ,  G01R33/56536

摘要： 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.

摘要翻译： 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。

公开(公告)号：US09134390B2

公开(公告)日：2015-09-15

申请号：US13436576

申请日：2012-03-30

申请人： Daniel Evers ,  Klaus Huber ,  Florian Poprawa ,  Christina Schindler ,  Markus Vester ,  Jörg Zapf

发明人： Daniel Evers ,  Klaus Huber ,  Florian Poprawa ,  Christina Schindler ,  Markus Vester ,  Jörg Zapf

IPC分类号： G01V3/00 ,  G01R33/422 ,  G01R33/3415 ,  G01R33/36

CPC分类号： G01R33/422 ,  G01R33/3415 ,  G01R33/3621 ,  G01R33/3692

摘要： The present embodiments relate to a magnetic resonance local coil with a receive antenna for receiving magnetic resonance signals. The magnetic resonance local coil also includes a transmission unit for transmitting magnetic resonance signal data generated on the basis of the magnetic resonance signals via a data transmit antenna of the magnetic resonance local coil to a signal data receiving unit of a magnetic resonance tomography systems. The transmission unit is provided, at least in sections, with screening with a first metal coating and a first dielectric coating.

摘要翻译： 本实施例涉及具有用于接收磁共振信号的接收天线的磁共振局部线圈。 磁共振局部线圈还包括传输单元，用于将通过磁共振局部线圈的数据发射天线的磁共振信号产生的磁共振信号数据发送到磁共振断层摄影系统的信号数据接收单元。 传动单元至少在分段上设置有第一金属涂层和第一介电涂层的筛选。

公开(公告)号：US08994374B2

公开(公告)日：2015-03-31

申请号：US13432437

申请日：2012-03-28

申请人： Andre Albsmeier ,  Jan Bollenbeck ,  Klaus Pistor ,  Florian Poprawa ,  Stefan Schwarzer ,  Markus Vester ,  Thomas Wuchenauer

发明人： Andre Albsmeier ,  Jan Bollenbeck ,  Klaus Pistor ,  Florian Poprawa ,  Stefan Schwarzer ,  Markus Vester ,  Thomas Wuchenauer

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

CPC分类号： G01R33/3692 ,  G01R33/3415 ,  G01R33/3621

摘要： A local coil system for a magnetic resonance system has a local coil for detecting MR response signals and a transmitter for wirelessly transmitting signals to the magnetic resonance system. At least one pseudo random device is operable to change signals in a pseudo random fashion in order to avoid interferences in the imaging.

摘要翻译： 用于磁共振系统的局部线圈系统具有用于检测MR响应信号的本地线圈和用于将信号无线传输到磁共振系统的发射器。 至少一个伪随机设备可操作以伪随机方式改变信号，以避免成像中的干扰。

公开(公告)号：US20150028870A1

公开(公告)日：2015-01-29

申请号：US14349419

申请日：2012-09-12

申请人： Chih-Chung Chen ,  Klaus Huber ,  Johannes Reinschke ,  Claus Seisenberger ,  Markus Vester ,  Christian Wünsch

发明人： Chih-Chung Chen ,  Klaus Huber ,  Johannes Reinschke ,  Claus Seisenberger ,  Markus Vester ,  Christian Wünsch

IPC分类号： G01R33/54 ,  A61B5/055 ,  A61B5/00 ,  G01R33/36

CPC分类号： G01R33/543 ,  A61B5/055 ,  A61B5/7225 ,  A61B5/7271 ,  G01R33/3614 ,  G01R33/365

摘要： A two-channel magnetic resonance tomography system is provided with a regulation circuit for an amplification system in order to be able to take into account different load situations of the MRI system in a flexible and efficient manner. It is thus possible to improve the MRI measurements greatly if the MRI system is set to the respective load situation beforehand by an idle state measurement. The adaptation may optionally also be carried out during the MRI measurement. Therefore, a multiplicity of completely different load situations may be taken into account in an optimized manner by the regulation circuit.

摘要翻译： 双通道磁共振断层摄影系统具有用于放大系统的调节电路，以便能够以灵活和有效的方式考虑到MRI系统的不同负载情况。 如果通过空闲状态测量将MRI系统预先设定为相应的负载状态，则可以大大改善MRI测量。 也可以在MRI测量期间进行适应。 因此，可以通过调节电路以优化的方式考虑多种完全不同的负载情况。

公开(公告)号：US20140292337A1

公开(公告)日：2014-10-02

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： G01R33/36

CPC分类号： G01R33/365 ,  G01R33/5612

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.

摘要翻译： 确定并行传输磁共振成像（MRI）系统的线圈阵列的去耦系统的去耦矩阵的方法包括：获得用于没有去耦系统的线圈阵列的阻抗矩阵数据，基于阻抗矩阵数据 对于线圈阵列，表示偏离线圈阵列的去耦工作条件的目标函数，其中线圈阵列经由去耦系统去耦，并且用处理器定义代表一组线圈的去耦矩阵 解耦系统的阻抗具有优化去耦矩阵的元素以最小化目标函数并达到解耦操作条件的迭代过程。

公开(公告)号：US08766632B2

公开(公告)日：2014-07-01

申请号：US13240026

申请日：2011-09-22

申请人： Stephan Biber ,  Jürgen Nistler ,  Markus Vester

发明人： Stephan Biber ,  Jürgen Nistler ,  Markus Vester

IPC分类号： G01V3/00

CPC分类号： G01R33/422 ,  G01R33/34007 ,  G01R33/3415 ,  G01R33/3642

摘要： A magnetic resonance device with a measurement chamber, an antenna arrangement that has a plurality of antenna elements arranged at least in certain areas around the measurement chamber, a gradient coil system arranged outside the antenna arrangement as seen from the measurement chamber, and a high-frequency shield system arranged between the antenna arrangement and the gradient coil system are provided. The high-frequency shield system has a reflector array with a plurality of passive reflector resonance circuits, each of which is configured such that resonance frequencies of the plurality of passive reflector resonance circuits lie below an operating magnetic resonance frequency of the magnetic resonance device and that the plurality of passive reflector resonance circuits has an inductive overall impedance.

摘要翻译： 一种具有测量室的磁共振装置，至少在测量室周围的某些区域中布置有多个天线元件的天线装置，从测量室观察时布置在天线装置外部的梯度线圈系统， 设置在天线装置和梯度线圈系统之间的频率屏蔽系统。 高频屏蔽系统具有多个无源反射器谐振电路的反射器阵列，每个被动反射器谐振电路被配置为使得多个无源反射器谐振电路的谐振频率低于磁共振装置的工作磁共振频率，并且 多个无源反射器谐振电路具有感应整体阻抗。

公开(公告)号：US20140117990A1

公开(公告)日：2014-05-01

申请号：US14062329

申请日：2013-10-24

申请人： Yan Li Chen ,  Yu Tang ,  Markus Vester ,  Jian Min Wang ,  Zhibin Li

发明人： Yan Li Chen ,  Yu Tang ,  Markus Vester ,  Jian Min Wang ,  Zhibin Li

IPC分类号： G01R33/34

CPC分类号： G01R33/34076 ,  G01R33/288

摘要： A body coil includes a first end ring and a second end ring provided at two ends thereof. The first end ring and the second end ring are connected to each other with a plurality of legs. The first end ring or the second end ring has a structure with the current flow width in a direction parallel to the axis thereof being greater than that in a direction perpendicular to the axis thereof. Since the effective action width of the current is increased in the axial direction and the centralized flow of the current in the end ring is reduced, the local specific absorption rate of radio frequency induced by the magnetic field is therefore reduced.

摘要翻译： 身体线圈包括设置在其两端的第一端环和第二端环。 第一端环和第二端环以多个腿相互连接。 第一端环或第二端环具有在与其轴线平行的方向上的电流流动宽度大于垂直于其轴线的方向上的电流流动宽度的结构。 由于电流的有效作用宽度在轴向上增加，并且端环中的电流的集中流动减小，因此减小了由磁场引起的射频的局部比吸收率。

公开(公告)号：US20140062480A1

公开(公告)日：2014-03-06

申请号：US14018139

申请日：2013-09-04

申请人： Jan Bollenbeck ,  Ralph Oppelt ,  Markus Vester

发明人： Jan Bollenbeck ,  Ralph Oppelt ,  Markus Vester

IPC分类号： G01R33/54

CPC分类号： G01R33/54 ,  G01R33/3415 ,  G01R33/3621 ,  G01R33/3692

摘要： An arrangement for the transmission of magnetic resonance signals that are received with the aid of local coils is provided. The magnetic resonance signal is fed to an analog/digital converter and digitized by the analog/digital converter. The magnetic resonance signal is compressed in amplitude before being fed to the analog/digital converter, is low-pass filtered or band-pass filtered, and is expanded after digitization by the analog/digital converter. A clock rate that is higher by a factor 2n than a sampling rate n of the analog/digital converter (ADC) is used for the digital expander. A digital equalizing filter for compensating for a filter transmission function in a transition range may also be used.

摘要翻译： 提供了借助于本地线圈接收的用于传输磁共振信号的装置。 磁共振信号被馈送到模拟/数字转换器并由模拟/数字转换器数字化。 在馈送到模拟/数字转换器之前，磁共振信号以幅度被压缩，被低通滤波或带通滤波，并且在通过模拟/数字转换器数字化之后被扩展。 数字扩展器使用比模拟/数字转换器（ADC）的采样率n高2n倍的时钟速率。 也可以使用用于补偿过渡范围内的过滤器传递功能的数字均衡滤波器。