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    ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM
    1.
    发明申请
    ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM 有权
    电性质地图成像方法与系统

    公开(公告)号：US20120306493A1

    公开(公告)日：2012-12-06

    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

    CPC分类号： G01R33/48 ,  A61B5/0536 ,  A61B5/055 ,  G01R33/246 ,  G01R33/443

    摘要： The invention relates to a magnetic resonance method of electric properties tomography imaging of an object, the method comprising: 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).

    摘要翻译： 本发明涉及一种物体的电性能断层摄影成像的磁共振方法，该方法包括：经由第一空间线圈位置（402）的线圈将激发RF场施加到物体，经由接收器获得产生的磁共振信号 从所述对象中确定所述线圈在所述第一线圈位置（402）处的所述磁共振信号的第一相位分布和所述线圈的激励RF场的给定磁场分量的第一幅度，并将线圈重复这些步骤 第二不同的空间线圈位置（404），以获得第二相位分布，确定所述第一和第二相位分布之间的相位差，确定所述对象的第一和第二复介电常数，所述第一复介电常数包括所述第一和第二相位分布的第一幅度 给定的磁场分量和包括给定磁场的第二振幅的第二复数介电常数 分量和相位差，将第一复数介电常数和第二复数介电常数相等以接收最终方程，并从最终方程确定用于第一线圈位置（402）的给定磁场分量的相位。

    MR imaging using multi-channel RF excitation
    3.
    发明授权
    MR imaging using multi-channel RF excitation 有权
    MR成像采用多通道RF激发

    公开(公告)号：US08938281B2

    公开(公告)日：2015-01-20

    申请号：US13496085

    申请日：2010-09-27

    申请人： Miha Fuderer ,  Thomas Hendrik Rozijn ,  Ulrich Katscher ,  Kay Nehrke ,  Paul Royston Harvey

    发明人： Miha Fuderer ,  Thomas Hendrik Rozijn ,  Ulrich Katscher ,  Kay Nehrke ,  Paul Royston Harvey

    IPC分类号： A61B5/05 ,  G01R33/561 ,  G01R33/565

    CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/5659

    摘要： The invention relates to a magnetic resonance imaging apparatus including an array of two or more RF antennas for transmitting RF pulses to and receiving MR signals from a subject positioned in an examination volume, and where the RF antennas have spatial transmit and receive sensitivity profiles. The apparatus is configured to control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna. The apparatus is also configured to determine the phases and amplitudes from the spatial transmit sensitivity profiles of the RF antennas, and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas and from the spatial receive sensitivity profiles of the RF antennas. Further, the apparatus is configured to determine the spatial transmit sensitivity profiles of the RF antennas from the spatial receive sensitivity profiles of the RF antennas, or vice versa.

    摘要翻译： 本发明涉及一种磁共振成像设备，包括两个或更多个RF天线的阵列，用于将RF脉冲发送到定位在检查体积中的被摄体并接收MR信号，并且其中RF天线具有空间发射和接收灵敏度分布。 该装置被配置为控制每个单独RF天线的RF馈送的时间连续性，相位和幅度。 该装置还被配置为根据RF天线的空间发射灵敏度分布来确定相位和振幅，并且从经由各个RF天线接收的接收的MR信号和从RF天线的空间接收灵敏度分布的组合重建MR图像 射频天线。 此外，该装置被配置为根据RF天线的空间接收灵敏度分布来确定RF天线的空间发射灵敏度分布，反之亦然。

    DETERMINATION OF LOCAL SAR IN VIVO AND ELECTRICAL CONDUCTIVITY MAPPING
    4.
    发明申请
    DETERMINATION OF LOCAL SAR IN VIVO AND ELECTRICAL CONDUCTIVITY MAPPING 审中-公开
    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。

    MR IMAGING USING MULTI-CHANNEL RF EXCITATION
    5.
    发明申请
    MR IMAGING USING MULTI-CHANNEL RF EXCITATION 有权
    使用多通道射频激励成像

    公开(公告)号：US20120179023A1

    公开(公告)日：2012-07-12

    申请号：US13496085

    申请日：2010-09-27

    申请人： Miha Fuderer ,  Thomas Hendrik Rozijn ,  Ulrich Katscher ,  Kay Nehrke ,  Paul Royston Harvey

    发明人： Miha Fuderer ,  Thomas Hendrik Rozijn ,  Ulrich Katscher ,  Kay Nehrke ,  Paul Royston Harvey

    IPC分类号： A61B5/055

    CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/5659

    摘要： The invention relates to a magnetic resonance imaging apparatus comprising an array of two or more RF antennas (9) for transmitting RF pulses to and receiving MR signals from a body (7) of a patient positioned in an examination volume (2), the RF antennas (9) having spatial transmit and receive sensitivity profiles. The apparatus is arranged to: control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna (9), the phases and amplitudes being determined from the spatial transmit sensitivity profiles of the RF antennas (9), and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas (9) and from the spatial receive sensitivity profiles of the RF antennas (9). The invention proposes that the apparatus is further arranged to: determine the spatial transmit sensitivity profiles of the RF antennas (9) from the spatial receive sensitivity profiles of the RF antennas (9), or determine the spatial receive sensitivity profiles of the RF antennas (9) from the spatial transmit sensitivity profiles of the RF antennas (9).

    摘要翻译： 本发明涉及一种磁共振成像设备，其包括用于向位于检查体积（2）中的患者的身体（7）发送RF脉冲并从其接收MR信号的两个或更多个RF天线（9）的阵列，RF 天线（9）具有空间发射和接收灵敏度分布。 该装置被设置为：控制每个单独RF天线（9）的RF馈送的时间连续性，相位和幅度，根据RF天线（9）的空间发射灵敏度分布确定相位和幅度， 并且从经由各个RF天线（9）接收的接收的MR信号和RF天线（9）的空间接收灵敏度分布的组合重建MR图像。 本发明提出，该装置还被布置为：根据RF天线（9）的空间接收灵敏度分布来确定RF天线（9）的空间发射灵敏度分布，或者确定RF天线的空间接收灵敏度分布（ 9）从RF天线（9）的空间发射灵敏度分布图。

    REDUCING THE RADIO-FREQUENCY TRANSMIT FIELD IN A PREDETERMINED VOLUME DURING MAGNETIC RESONANCE IMAGING
    6.
    发明申请
    REDUCING THE RADIO-FREQUENCY TRANSMIT FIELD IN A PREDETERMINED VOLUME DURING MAGNETIC RESONANCE IMAGING 有权
    在磁共振成像期间减少预测体积中的无线电频率发射

    公开(公告)号：US20140210472A1

    公开(公告)日：2014-07-31

    申请号：US14238999

    申请日：2012-08-15

    申请人： Hanno Heyke Homann ,  Ingmar Graesslin ,  Ulrich Katscher ,  Tobias Ratko Voigt ,  Olaf Helmut Dössel ,  Sebastian Alfred Seitz

    发明人： Hanno Heyke Homann ,  Ingmar Graesslin ,  Ulrich Katscher ,  Tobias Ratko Voigt ,  Olaf Helmut Dössel ,  Sebastian Alfred Seitz

    IPC分类号： G01R33/36

    CPC分类号： G01R33/36 ,  G01R33/285 ,  G01R33/288 ,  G01R33/5612

    摘要： Embodiments of the invention relate to a magnetic resonance imaging system (300) for acquiring magnetic resonance data (358) from a subject (318) that may comprise an electrically conductive object (e.g. an implant or a medical device). The magnetic resonance imaging system comprises a radio-frequency transmitter (314) for generating a radio-frequency transmit field for acquiring the magnetic resonance data using a radio-frequency antenna (310). The radio-frequency transmitter has multiple transmit channels. The radio-frequency antenna comprises multiple antenna elements (312) each adapted to connect to an antenna element. According to an embodiment of the invention, the amplitude and phase values of the RF transmit field of each of the transmit channels are selected such that the magnetic field generated by the RF antenna is minimized at the location of the electrically conductive object, thereby reducing RF heating of the object.

    摘要翻译： 本发明的实施例涉及一种用于从可能包括导电物体（例如植入物或医疗装置）的被摄体（318）获取磁共振数据（358）的磁共振成像系统（300）。 磁共振成像系统包括用于使用射频天线（310）产生用于获取磁共振数据的射频发射场的射频发射机（314）。 射频发射机具有多个发射信道。 射频天线包括各自适于连接到天线元件的多个天线元件（312）。 根据本发明的实施例，选择每个发射信道的RF发射场的幅度和相位值，使得由RF天线产生的磁场在导电物体的位置处最小化，从而减少RF 加热物体。

    METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE
    7.
    发明申请
    METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE 有权
    计算核磁共振中局部特定能量吸收率（SAR）的方法

    公开(公告)号：US20120262174A1

    公开(公告)日：2012-10-18

    申请号：US13514611

    申请日：2010-12-28

    申请人： Tobias Ratko Voigt ,  Ulrich Katscher ,  Hanno Heyke Homann

    发明人： Tobias Ratko Voigt ,  Ulrich Katscher ,  Hanno Heyke Homann

    IPC分类号： G01R33/483 ,  G01R33/34

    CPC分类号： G01R33/288 ,  G01R33/246 ,  G01R33/443 ,  G01R33/543 ,  G01R33/546 ,  G01R33/5608

    摘要： A method for calculating a local specific energy absorption rate (SAR) on basis of an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan. The magnetic field mapping method based on a magnetic resonance scan can be a Bi mapping method. The invention also relates to a magnetic resonance system by means of which SAR calculation can be done in a relatively short period of time. The invention also relates to a computer program comprising instructions for calculating a local specific energy absorption rate (SAR) according to the above mentioned method. The SAR calculation used in the above mentioned method, system and program is done in the relatively short period of time and as such is practicable in a clinical setting.

    摘要翻译： 一种用于根据电参数和物体的分段几何形状的质量密度和射频（RF）天线的磁场矢量分布来计算局部比能吸收率（SAR）的方法。 电参数和质量密度的值是预定值，而通过基于磁共振（MR）扫描的磁场映射方法来估计磁场矢量分布。 基于磁共振扫描的磁场映射方法可以是Bi映射方法。 本发明还涉及一种磁共振系统，通过该系统可以在相对较短的时间内进行SAR计算。 本发明还涉及一种包括根据上述方法计算局部比能吸收率（SAR）的指令的计算机程序。 上述方法，系统和程序中使用的SAR计算在相对较短的时间内完成，因此在临床环境中可行。

    FLIP ANGLE IMAGING WITH IMPROVED B1 MAPPING FOR MULTI-RF TRANSMIT SYSTEMS
    9.
    发明申请
    FLIP ANGLE IMAGING WITH IMPROVED B1 MAPPING FOR MULTI-RF TRANSMIT SYSTEMS 有权
    具有改进的用于多射频发射系统的B1映射的翻转角成像

    公开(公告)号：US20110026799A1

    公开(公告)日：2011-02-03

    申请号：US12933897

    申请日：2009-03-26

    申请人： Kay Nehrke ,  Peter Boernert ,  Tobias Ratko Voigt ,  Ulrich Katscher

    发明人： Kay Nehrke ,  Peter Boernert ,  Tobias Ratko Voigt ,  Ulrich Katscher

    IPC分类号： G06K9/00

    CPC分类号： G01R33/586 ,  G01R33/246 ,  G01R33/3415 ,  G01R33/5612 ,  G01R33/56518 ,  G01R33/5659

    摘要： A magnetic resonance method includes performing a plurality of magnetic resonance excitation operations each using a different sub-set of a set of radio frequency transmit coils (30), each sub-set including more than one radio frequency transmit coil, acquiring magnetic resonance data responsive to each said magnetic resonance excitation operation, and computing a B1 or flip angle map for each radio frequency transmit coil of the set of radio frequency transmit coils based on the acquired magnetic resonance data. A magnetic resonance method includes performing an actual flip angle mapping (AFI) sequence using a radio frequency transmit coil (32) with a ratio TR1:TR2 of the TR times of the AFI sequence selected to be rational, acquiring magnetic resonance data responsive to said AFI sequence, and computing a B1 or flip angle map for the radio frequency transmit coil based on the acquired magnetic resonance data.

    摘要翻译： 磁共振方法包括使用一组射频发射线圈（30）的不同子集执行多个磁共振激励操作，每个子集包括多于一个射频发射线圈，响应于磁共振数据 到每个所述磁共振激励操作，以及基于所获取的磁共振数据计算所述射频发射线圈组中的每个射频发射线圈的B1或翻角图。 磁共振方法包括使用射频发射线圈（32）执行实际的翻转角映射（AFI）序列，其中AFI序列的TR次的比值TR1：TR2被选择为合理，获取响应于所述的 AFI序列，并且基于获取的磁共振数据计算用于射频发射线圈的B1或翻转角图。