公开(公告)号：US20080211501A1

公开(公告)日：2008-09-04

申请号：US11912683

申请日：2006-04-21

申请人： Ingmar Graesslin ,  Peter Vernickel ,  Joachim Schmidt ,  Christian Findeklee

发明人： Ingmar Graesslin ,  Peter Vernickel ,  Joachim Schmidt ,  Christian Findeklee

IPC分类号： G01R33/3415 ,  G01R33/48

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/3415 ,  G01R33/58 ,  G01R33/583

摘要： Methods and circuit arrangements for operating multi-channel transmit/receive antenna devices or arrangements especially for use in magnetic resonance imaging (MRI) systems are disclosed, by which a fully independent control of complete multi-channel RF transmit and receive chains can be conducted in a flexible way and new options like RF shimming, transmit sensitivity encoding (TransmitSENSE), RF encoding, determination of S- or Z-matrix prior to spin echo measurements, calibration, SAR (specific absorption rate) reduction etc. can be utilized or improved.

摘要翻译： 公开了用于操作多通道发射/接收天线装置或特别用于磁共振成像（MRI）系统的装置的方法和电路装置，通过该装置可完全独立地控制完整的多通道RF发射和接收链， 可以利用或改进灵活的方式和新的选项，如RF匀场，发射灵敏度编码（TransmitSENSE），RF编码，自旋回波测量之前的S或Z矩阵的确定，校准，SAR（比吸收率）降低等） 。

公开(公告)号：US07701213B2

公开(公告)日：2010-04-20

申请号：US11912683

申请日：2006-04-21

申请人： Ingmar Graesslin ,  Peter Vernickel ,  Joachim Schmidt ,  Christian Findeklee

发明人： Ingmar Graesslin ,  Peter Vernickel ,  Joachim Schmidt ,  Christian Findeklee

IPC分类号： G01V3/00

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/3415 ,  G01R33/58 ,  G01R33/583

摘要： A method and circuit arrangement for operating multi-channel transmit/receive antenna devices or arrangements is used in magnetic resonance imaging (MRI) systems. Full independent control of complete multi-channel RF transmit and receive chains can be conducted in a flexible way and new options like RF shimming, transmit sensitivity encoding (TransmitSENSE), RF encoding, determination of S- or Z-matrix prior to spin echo measurements, calibration, SAR (specific absorption rate) reduction etc. can be utilized or improved.

摘要翻译： 在磁共振成像（MRI）系统中使用用于操作多通道发射/接收天线装置或装置的方法和电路装置。 完整的独立控制完整的多通道射频发射和接收链可以以灵活的方式进行，如RF匀场，发射灵敏度编码（TransmitSENSE），RF编码，自旋回波测量之前的S-或Z-矩阵的确定等新选项 ，可以利用或改善校准，SAR（比吸收率）降低等。

公开(公告)号：US09733324B2

公开(公告)日：2017-08-15

申请号：US14130379

申请日：2012-06-21

申请人： Christian Findeklee ,  Peter Vernickel

发明人： Christian Findeklee ,  Peter Vernickel

IPC分类号： G01R33/36 ,  G01R33/3415 ,  G01R33/565

CPC分类号： G01R33/3628 ,  G01R33/3415 ,  G01R33/3635 ,  G01R33/365 ,  G01R33/5659

摘要： The Magnetic Resonance Imaging (MRI) system includes a radio-frequency transmitter with multiple transmit channels. The MRI system includes an impedance matching network (320, 1402, 1502, 1602) for matching the radio-frequency transmitter to a remotely adjustable radio-frequency antenna (310, 1504, 1602) with multiple antenna elements (312, 314, 316, 318, 1404). The MRI system includes a processor (336) for controlling the MRI system. The execution of the instructions by the processor causes it to: measure (100, 200) a set of radio-frequency properties (352) of the radio-frequency antenna, calculate (102, 202) a matching network command (354) using the set of radio-frequency properties and a radio frequency model (366), and adjust (104, 204) the impedance matching network by sending the matching network command to the impedance matching network, thereby enabling automatic remote impedance matching.

公开(公告)号：US20120139541A1

公开(公告)日：2012-06-07

申请号：US12933894

申请日：2009-03-25

申请人： Steffen Weiss ,  Ulrich Katscher ,  Peter Vernickel ,  Tobias Ratko Voigt ,  Christian Findeklee

发明人： Steffen Weiss ,  Ulrich Katscher ,  Peter Vernickel ,  Tobias Ratko Voigt ,  Christian Findeklee

IPC分类号： G01R33/44

CPC分类号： G01R33/583 ,  A61B5/055 ,  G01R33/288

摘要： A magnetic resonance imaging apparatus produces calculations of local specific energy absorption rates (SAR) by calculating an electrical permittivity map of a subject. The electric permittivity is calculated by measuring the components of the B1 field induced by a radio frequency (RF) coil (16). The Hx and Hy components of the B1 field can be directly measured. The Hz component is measured by encoding it into the phase of the resonance signals. Alternately, Hz can be calculated by solving Gauss's law for magnetism. Hz can also be estimated by finding the z component of the electric field. In the specific case of a birdcage RF coil, Hz can be estimated by using a model of the RF coil and a subject, a model of the RF coil alone, or setting Hz to a constant.

摘要翻译： 磁共振成像装置通过计算受试者的电容率图来产生局部比能吸收率（SAR）的计算。 通过测量由射频（RF）线圈（16）感应的B1场的分量来计算电容率。 可以直接测量B1场的Hx和Hy分量。 通过对谐振信号的相位进行编码来测量Hz分量。 或者，可以通过求解磁性的高斯定律来计算Hz。 Hz也可以通过找到电场的z分量来估计。 在鸟笼RF线圈的具体情况下，可以通过使用RF线圈和对象的模型，单独的RF线圈的模型或将Hz设置为常数来估计Hz。

公开(公告)号：US20140139218A1

公开(公告)日：2014-05-22

申请号：US14130379

申请日：2012-06-21

申请人： Christian Findeklee ,  Peter Vernickel

发明人： Christian Findeklee ,  Peter Vernickel

IPC分类号： G01R33/36

CPC分类号： G01R33/3628 ,  G01R33/3415 ,  G01R33/3635 ,  G01R33/365 ,  G01R33/5659

摘要： The Magnetic Resonance Imaging (MRI) system includes a radio-frequency transmitter with multiple transmit channels. The MRI system includes an impedance matching network (320, 1402, 1502, 1602) for matching the radio-frequency transmitter to a remotely adjustable radio-frequency antenna (310, 1504, 1602) with multiple antenna elements (312, 314, 316, 318, 1404). The MRI system includes a processor (336) for controlling the MRI system. The execution of the instructions by the processor causes it to: measure (100, 200) a set of radio-frequency properties (352) of the radio-frequency antenna, calculate (102, 202) a matching network command (354) using the set of radio-frequency properties and a radio frequency model (366), and adjust (104, 204) the impedance matching network by sending the matching network command to the impedance matching network, thereby enabling automatic remote impedance matching.

摘要翻译： 磁共振成像（MRI）系统包括具有多个发射通道的射频发射机。 MRI系统包括用于将射频发射机与具有多个天线元件（312,314,316和1602）的远程可调射频天线（310,1504,1602）匹配的阻抗匹配网络（320,1402,1502,1602） 318，1404）。 MRI系统包括用于控制MRI系统的处理器（336）。 由处理器执行指令使其：测量（100,200）一组射频天线的射频特性（352），使用该方法计算（102,202）匹配的网络命令（354） 射频特性组和射频模型（366），并通过将匹配网络命令发送到阻抗匹配网络来调整（104,204）阻抗匹配网络，从而实现自动远程阻抗匹配。

公开(公告)号：US07701211B2

公开(公告)日：2010-04-20

申请号：US11721544

申请日：2005-12-19

申请人： Ulrich Katscher ,  Christian Findeklee ,  Peter Vernickel ,  Christoph Leussler

发明人： Ulrich Katscher ,  Christian Findeklee ,  Peter Vernickel ,  Christoph Leussler

IPC分类号： G01V3/00

CPC分类号： G01R33/3607 ,  G01R33/5611

摘要： The present invention relates to a magnetic resonance imaging system (1) comprising a plurality of RF coils (4) forming a multi-coil array and furthermore to a magnetic resonance imaging method for such a system. In order to provide an MR imaging system and method in which a desired excitation pattern is achieved in a simple way, it is suggested to utilize an analytical procedure how to combine the single coil elements to obtain the most homogeneous B1 excitation possible with a given coil array. In other words, the homogeneity of the B1 field is improved in a very simple way. The sensitivity of each RF coil (4) of the coil array is scaled or weighted by a complex factor, i.e. phase and amplitude of each coil drive signal is adjusted accordingly. These complex factors are determined analytically utilizing the sensitivities S(8) of the coil elements (4) and the desired excitation pattern P (IO, 11). The invention allows an optimized control of the field distribution (RF shimming) for arbitrary RF coil arrays. With the invention a fast and easy independent phase and amplitude control of the coil elements (4) is provided for reducing body-induced RF non-uniformities, which appear in high field MR systems.

摘要翻译： 本发明涉及包括形成多线圈阵列的多个RF线圈（4）以及此类系统的磁共振成像方法的磁共振成像系统（1）。 为了提供以简单的方式实现期望的激励模式的MR成像系统和方法，建议使用分析程序如何组合单个线圈元件以获得可用于给定线圈的最均匀的B1激励 数组。 换句话说，B1场的均匀性以非常简单的方式得到改善。 线圈阵列的每个RF线圈（4）的灵敏度被复合因子缩放或加权，即相应地调整每个线圈驱动信号的相位和幅度。 利用线圈元件（4）的灵敏度S（8）和期望的激励模式P（IO，11）来分析地确定这些复杂因素。 本发明允许对任意RF线圈阵列的场分布（RF匀场）的优化控制。 利用本发明，提供线圈元件（4）的快速且容易的独立相位和幅度控制，用于减少出现在高场MR系统中的体引起的RF不均匀性。

公开(公告)号：US20090251144A1

公开(公告)日：2009-10-08

申请号：US11721544

申请日：2005-12-19

申请人： Ulrich Katscher ,  Christian Findeklee ,  Peter Vernickel ,  Christoph Leussler

发明人： Ulrich Katscher ,  Christian Findeklee ,  Peter Vernickel ,  Christoph Leussler

IPC分类号： G01R33/20 ,  G01R33/48

CPC分类号： G01R33/3607 ,  G01R33/5611

摘要： The present invention relates to a magnetic resonance imaging system (1) comprising a plurality of RF coils (4) forming a multi-coil array and furthermore to a magnetic resonance imaging method for such a system. In order to provide an MR imaging system and method in which a desired excitation pattern is achieved in a simple way, it is suggested to utilize an analytical procedure how to combine the single coil elements to obtain the most homogeneous B1 excitation possible with a given coil array. In other words, the homogeneity of the B1 field is improved in a very simple way. The sensitivity of each RF coil (4) of the coil array is scaled or weighted by a complex factor, i.e. phase and amplitude of each coil drive signal is adjusted accordingly. These complex factors are determined analytically utilizing the sensitivities S(8) of the coil elements (4) and the desired excitation pattern P (IO, 11). The invention allows an optimized control of the field distribution (RF shimming) for arbitrary RF coil arrays. With the invention a fast and easy independent phase and amplitude control of the coil elements (4) is provided for reducing body-induced RF non-uniformities, which appear in high field MR systems.

摘要翻译： 本发明涉及包括形成多线圈阵列的多个RF线圈（4）以及此类系统的磁共振成像方法的磁共振成像系统（1）。 为了提供以简单的方式实现期望的激励模式的MR成像系统和方法，建议使用分析程序如何组合单个线圈元件以获得可用于给定线圈的最均匀的B1激励 数组。 换句话说，B1场的均匀性以非常简单的方式得到改善。 线圈阵列的每个RF线圈（4）的灵敏度被复合因子缩放或加权，即相应地调整每个线圈驱动信号的相位和幅度。 利用线圈元件（4）的灵敏度S（8）和期望的激励模式P（IO，11）来分析地确定这些复杂因素。 本发明允许对任意RF线圈阵列的场分布（RF匀场）的优化控制。 利用本发明，提供线圈元件（4）的快速且容易的独立相位和幅度控制，用于减少出现在高场MR系统中的体引起的RF不均匀性。

公开(公告)号：US20120019250A1

公开(公告)日：2012-01-26

申请号：US13258612

申请日：2010-03-26

申请人： Christian Findeklee

发明人： Christian Findeklee

IPC分类号： G01R33/36 ,  H01Q1/50 ,  G01R33/34

CPC分类号： G01R33/3415 ,  G01R33/3628 ,  G01R33/3642

摘要： The invention relates to a system comprising an array of two or more receiving antennas (11, 12, 13) for receiving RF signals, each receiving antenna being connected, via a matching network (19, 20, 21), to a low-noise amplifier (22, 23, 24) presenting an input impedance to the matching network (19, 20, 21), each chain consisting of a receiving antenna (11, 12, 13), a matching network (19, 20, 21) and a low-noise amplifier (22, 23, 24) constituting a part of a receiving channel of the system, the matching networks (19, 20, 21) transforming optimum impedances of the low-noise amplifiers (22, 23, 24), the optimum impedances providing optimum noise performance of the low-noise amplifiers (22, 23, 24), wherein each receiving channel comprises at least one switchable impedance (28, 29, 30) at the input of each low-noise amplifier (22, 23, 24) for switching the input impedance as presented to each matching network (19, 20, 21) to a value being the complex conjugate of the optimum impedance of the respective low-noise amplifier (22, 23, 24). The system is arranged to perform an optimization procedure comprising the following steps: a) switching the input impedance presented to the matching network (19, 20, 21) in each receiving channel to the complex conjugate of the optimum impedance of the respective low-noise amplifier (22, 23, 24); b) receiving RF signals via the receiving antennas (11, 12, 13); c) forming a weighted sum of the signal power of the received RF signals; d) modifying the matching networks (19, 20, 21) of all receiving channels so as to find an optimum matching condition by maximizing the weighted power sum; c) switching the input impedance in each receiving channel back to a value for regular operation of the system.

摘要翻译： 本发明涉及一种系统，其包括用于接收RF信号的两个或更多个接收天线（11,12,13）的阵列，每个接收天线经由匹配网络（19,20,21）被连接到低噪声 放大器（22,23,24）向匹配网络（19,20,21）呈现输入阻抗，每条链由接收天线（11,12,13），匹配网络（19,20,21）和 构成系统的接收信道的一部分的低噪声放大器（22,23,24），匹配网络（19,20,21）对低噪声放大器（22,23,24）的最佳阻抗进行变换， 所述最佳阻抗提供所述低噪声放大器（22,23,24）的最佳噪声性能，其中每个接收通道包括在每个低噪声放大器（22,23,24）的输入处的至少一个可切换阻抗（28,29,30） 23,24），用于将呈现的输入阻抗切换到每个匹配网络（19,20,21），其值为最佳阻抗o的复共轭 f各个低噪声放大器（22,23,24）。 该系统被布置为执行优化过程，该过程包括以下步骤：a）将呈现给每个接收信道中的匹配网络（19,20,21）的输入阻抗切换到相应低噪声的最佳阻抗的复共轭 放大器（22,23,24）; b）经由所述接收天线（11,12,13）接收RF信号; c）形成所接收的RF信号的信号功率的加权和; d）修改所有接收信道的匹配网络（19,20,21），以便通过最大化加权功率和来找到最佳匹配条件; c）将每个接收通道中的输入阻抗切换回系统的常规操作的值。

公开(公告)号：US07973531B2

公开(公告)日：2011-07-05

申请号：US12302354

申请日：2007-05-29

申请人： Christian Findeklee ,  Daniel Wirtz

发明人： Christian Findeklee ,  Daniel Wirtz

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34007 ,  G01R33/345 ,  G01R33/3453 ,  G01R33/3635 ,  G01R33/3657

摘要： For detuning of radio-frequency coils (in magnetic resonance imaging and spectroscopy, for example), a conducting element (102) of a transmission cable is configured to form a primary resonant circuit tunable to at least one first resonance frequency. A second conducting element (104) of the transmission cable is configured to form a switching circuit that is electrically insulated from and reactively coupled via inductive coupling and/or capacitive coupling to the primary resonant circuit, and is adapted to tune the primary resonant circuit to at least one second resonance frequency, thereby detuning the primary resonant circuit.

摘要翻译： 对于射频线圈的失谐（例如在磁共振成像和光谱学中），传输电缆的导电元件（102）被配置为形成可调谐至少一个第一共振频率的主谐振电路。 传输电缆的第二导电元件（104）被配置为形成开关电路，该开关电路通过电感耦合和/或电容耦合与主谐振电路电绝缘并且通过其反应耦合，并且适于将主谐振电路调谐到 至少一个第二谐振频率，从而使主谐振电路失谐。

公开(公告)号：US07602187B2

公开(公告)日：2009-10-13

申请号：US11570893

申请日：2005-06-07

申请人： Kai-Michael Luedeke ,  Christian Findeklee ,  Peter H. Notten ,  Marinus J. A. M. van Helvoort ,  Hans H. Tuithof

发明人： Kai-Michael Luedeke ,  Christian Findeklee ,  Peter H. Notten ,  Marinus J. A. M. van Helvoort ,  Hans H. Tuithof

IPC分类号： G01V3/00

CPC分类号： H01M10/46 ,  G01R33/34 ,  G01R33/34007 ,  G01R33/34076 ,  G01R33/341 ,  G01R33/3415 ,  G01R33/422 ,  H01M2/1094 ,  H01M8/00 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/0565 ,  H01M10/345 ,  H01M10/425 ,  H01M10/482 ,  H01Q7/00

摘要： A radio frequency receive coil for receiving a magnetic resonance signal includes a radio frequency antenna. The radio frequency antenna includes one or more electrical conductors (72, 74, 76, 78, 172, 173, 176, 180, 252, 254), at least one of which is a substantially hollow conductor (72, 78, 172, 252, 254). At least one electrical component (100, 110, 110′, 110″, 140, 160, 200) is mounted to be shielded from interfering with the MR signal by disposing it inside the substantially hollow conductor. The at least one electrical component can be, for example, a battery (100, 160, 200), a storage capacitor (140), or coil electronics (110, 110′,110″).

摘要翻译： 用于接收磁共振信号的射频接收线圈包括射频天线。 射频天线包括一个或多个电导体（72,74,76,78,172,173,176,180,252,254），其中至少一个是基本中空的导体（72,78,172,252 ，254）。 安装至少一个电气部件（100,110,110'，110“，140,160,200）以通过将其布置在基本中空的导体内而被屏蔽以防止MR信号的干扰。 至少一个电气部件可以是例如电池（100,160,200），存储电容器（140）或线圈电子器件（110,110'，110“）。