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11. 发明授权

US09638777B2 Electric properties tomography imaging method and system 有权
公开(公告)号：US09638777B2
公开(公告)日：2017-05-02
申请号：US13522367
申请日：2011-01-13
申请人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
发明人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
IPC分类号： G01R33/54 , G01R33/341 , G01R33/48 , A61B5/053 , A61B5/055 , G01R33/24 , G01R33/44
CPC分类号： G01R33/48 , A61B5/0536 , A61B5/055 , G01R33/246 , G01R33/443
摘要： A magnetic resonance method of electric properties tomography imaging of an object includes applying an excitation RF field to the object via a coil at a first spatial coil position (402), acquiring resulting magnetic resonance signals via a receiving channel from the object, determining from the acquired magnetic resonance signals a first phase distribution and a first amplitude of a given magnetic field component of the excitation RF field of the coil at the first coil position (402), repeating these steps with a coil at a second different spatial coil position (404), to obtain a second phase distribution, determining a phase difference between the first and second phase distribution, determining a first and a second complex permittivity of the object, the first complex permittivity comprising the first amplitude of the given magnetic field component and the second complex permittivity comprising the second amplitude of the given magnetic field component and the phase difference, equating the first complex permittivity and the second complex permittivity for receiving a final equation and determining from the final equation a phase of the given magnetic field component for the first coil position (402).

12. 发明申请

US20130063147A1 DECOUPLING OF MULTIPLE CHANNELS OF AN MRI RF COIL ARRAY 有权
标题翻译： MRI射频线阵列的多通道解码
公开(公告)号：US20130063147A1
公开(公告)日：2013-03-14
申请号：US13697797
申请日：2011-04-26
申请人： Christian Findeklee
发明人： Christian Findeklee
IPC分类号： G01R33/341 , G01R33/54
CPC分类号： G01R33/3642 , G01R33/3415 , G01R33/365
摘要： A radio-frequency coil assembly (18), for use in a magnetic resonance imaging system (10), includes a plurality of coil elements (18n). The coil elements (18n) are connected to a decoupling network (40) which includes a plurality of decoupling elements (40n,x) connected (via transmission lines) to pairs of coil elements (18n, 18x) at corresponding ports (64n,64x) from which the coil can be fed. The decoupling elements (40n,x) compensate for mutual coupling between pairs of corresponding coil elements. An inductive coupling loop (51n), with a constant or adjustable mutual inductance, inductively couples the associated coil element (18n) to the corresponding decoupling network port (64n). Transmission lines (52n) electrically connect each inductive coupling loop (51n) to the decoupling network (40) at the corresponding port (64x). Each transmission line (52n) has an electrical length of kλ/2 where k=0,1,2,3 . . . and λ is a wavelength of the excited and/or received resonance signals inside the transmission line.
摘要翻译：一种用于磁共振成像系统（10）的射频线圈组件（18）包括多个线圈元件（18n）。线圈元件（18n）连接到去耦网络（40），该去耦网络包括多个去耦元件（40n，x），它们通过传输线连接到相应端口（64n，64x）上的线圈元件对（18n，18x）），可以从该线圈喂入线圈。去耦元件（40n，x）补偿相应线圈元件对之间的相互耦合。具有恒定或可调互感的电感耦合回路（51n）将相关线圈元件（18n）感应耦合到相应的去耦网络端口（64n）。传输线路（52n）在相应端口（64x）处将每个电感耦合回路（51n）电连接到去耦网络（40）。每个传输线（52n）具有kλ/ 2的电长度，其中k = 0,1,2,3。。。 λ是传输线内的激励和/或接收的谐振信号的波长。

13. 发明授权

US07701211B2 Magnetic resonance imaging system and method 有权
标题翻译：磁共振成像系统及方法
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。

14. 发明申请

US20090251144A1 MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD 有权
标题翻译：磁共振成像系统及方法
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。

15. 发明申请

US20080272786A1 Integrated Power Supply for Surface Coils 失效
标题翻译：表面线圈集成电源
公开(公告)号：US20080272786A1
公开(公告)日：2008-11-06
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“）。

16. 发明授权

US09733324B2 Magnetic resonance imaging system with a multi-channel impedance matching network 有权
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.

17. 发明申请

US20140055136A1 MULTICHANNEL RF VOLUME RESONATOR FOR MRI 有权
标题翻译：用于MRI的多通道RF体积共振器
公开(公告)号：US20140055136A1
公开(公告)日：2014-02-27
申请号：US14112152
申请日：2012-04-13
申请人： Christoph Leussler , Christian Findeklee , Wilhelmus Reinerius Maria Mens
发明人： Christoph Leussler , Christian Findeklee , Wilhelmus Reinerius Maria Mens
IPC分类号： G01R33/34
CPC分类号： G01R33/34092 , G01R33/3415 , G01R33/3664 , G01R33/5612
摘要： Abstract: An RF volume resonator system is disclosed comprising a multi-port RF volume resonator (40, 50; 60), like e.g. a TEM volume coil or TEM resonator, or a birdcage coil, all of those especially in the form of a local coil like a head coil, or a whole body coil, and a plurality of transmit and/or receive channels (T/RCh1, . . . T/RCh8) for operating the multi-port RF volume resonator for transmitting RF excitation signals and/or for receiving MR relaxation signals into/from an examination object or a part thereof. By the individual selection of each port (P1, . . . P8) and the appropriate amplitude and/or frequency and/or phase and/or pulse shapes of the RF transmit signals according to the physical properties of an examination object, a resonant RF mode within the examination object with an improved homogeneity can be excited by the RF resonator.
摘要翻译：摘要：公开了一种RF体积谐振器系统，其包括多端口RF体积谐振器（40,50,60） TEM体积线圈或TEM谐振器或鸟笼线圈，所有这些特别是诸如头部线圈的局部线圈或全体线圈以及多个发射和/或接收通道（T / RCh1， ... T / RCh8），用于操作用于发送RF激励信号的多端口RF体积谐振器和/或用于从检查对象或其部分接收MR松弛信号。通过根据检查对象的物理特性单独选择每个端口（P1，...，P8）和适当的幅度和/或频率和/或RF发射信号的相位和/或脉冲形状，共振RF 可以通过RF谐振器激发具有改进的均匀性的检查对象内的模式。

18. 发明申请

US20120139541A1 DETERMINATION OF LOCAL SAR IN VIVO AND ELECTRICAL CONDUCTIVITY MAPPING 审中-公开
标题翻译：局部SAR在血液和电导率测绘中的测定
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。

19. 发明申请

US20110148418A1 RF Power Splitter for Magnetic Resonance System 有权
标题翻译：射频功率分配器用于磁共振系统
公开(公告)号：US20110148418A1
公开(公告)日：2011-06-23
申请号：US13059238
申请日：2009-08-13
申请人： Christian Findeklee
发明人： Christian Findeklee
IPC分类号： G01R33/44 , H01P5/12 , H03H7/38
CPC分类号： H01P5/12
摘要： A radio frequency transmission system for a magnetic resonance system includes a radio frequency power amplifier (40) generating an input radio frequency signal that excites magnetic resonance in target nuclei and is designed for feeding an impedance Zo, a multi-channel radio frequency coil (18) having N radio frequency channels where N>1, and a power splitter (44) including (i) a parallel radio frequency connection point (50) at which the N channels of the radio frequency coil are connected in parallel to define an output impedance at the parallel radio frequency connection point, and (ii) an impedance matching circuit (54) connecting the radio frequency power amplifier with the radio frequency connection point and configured to provide impedance matching between the radio frequency power amplifier and the output impedance at the connection point.
摘要翻译：用于磁共振系统的射频传输系统包括射频功率放大器（40），其产生激励目标核中的磁共振的输入射频信号，并被设计用于馈送阻抗Zo，多通道射频线圈（18 ）具有N个无线电频道，其中N> 1，以及功率分配器（44），包括（i）并联射频连接点（50），所述射频线圈的N个通道并联连接以限定输出阻抗在并联射频连接点处，以及（ii）阻抗匹配电路（54），其连接射频功率放大器与射频连接点，并配置成提供射频功率放大器与连接处的输出阻抗之间的阻抗匹配点。

20. 发明申请

US20080211501A1 Method and Curcuit Arrangement For Operating Multi-Channel Transmit/Receive Antenna Devices 有权
标题翻译：用于操作多通道发射/接收天线设备的方法和电路布置
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）。

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