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    • 1. 发明申请
    • ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM
    • 电性质地图成像方法与系统
    • US20120306493A1
    • 2012-12-06
    • US13522367
    • 2011-01-13
    • Tobias Ratko VoigtUlrich KatscherThomas Hendrik RozijnPaul Royston HarveyHanno HomannChristian FindekleeEberhard Sebastian Hansis
    • Tobias Ratko VoigtUlrich KatscherThomas Hendrik RozijnPaul Royston HarveyHanno HomannChristian FindekleeEberhard Sebastian Hansis
    • G01R33/54G01R33/341
    • G01R33/48A61B5/0536A61B5/055G01R33/246G01R33/443
    • 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).
    • 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。
    • 3. 发明授权
    • MR imaging using multi-channel RF excitation
    • MR成像采用多通道RF激发
    • US08938281B2
    • 2015-01-20
    • US13496085
    • 2010-09-27
    • Miha FudererThomas Hendrik RozijnUlrich KatscherKay NehrkePaul Royston Harvey
    • Miha FudererThomas Hendrik RozijnUlrich KatscherKay NehrkePaul Royston Harvey
    • A61B5/05G01R33/561G01R33/565
    • G01R33/5612G01R33/246G01R33/5659
    • 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.
    • 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。
    • 4. 发明申请
    • MR IMAGING USING MULTI-CHANNEL RF EXCITATION
    • 使用多通道射频激励成像
    • US20120179023A1
    • 2012-07-12
    • US13496085
    • 2010-09-27
    • Miha FudererThomas Hendrik RozijnUlrich KatscherKay NehrkePaul Royston Harvey
    • Miha FudererThomas Hendrik RozijnUlrich KatscherKay NehrkePaul Royston Harvey
    • A61B5/055
    • G01R33/5612G01R33/246G01R33/5659
    • 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).
    • 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。
    • 7. 发明申请
    • METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE
    • 计算核磁共振中局部特定能量吸收率(SAR)的方法
    • US20120262174A1
    • 2012-10-18
    • US13514611
    • 2010-12-28
    • Tobias Ratko VoigtUlrich KatscherHanno Heyke Homann
    • Tobias Ratko VoigtUlrich KatscherHanno Heyke Homann
    • G01R33/483G01R33/34
    • G01R33/288G01R33/246G01R33/443G01R33/543G01R33/546G01R33/5608
    • 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.
    • 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。
    • 9. 发明申请
    • FLIP ANGLE IMAGING WITH IMPROVED B1 MAPPING FOR MULTI-RF TRANSMIT SYSTEMS
    • 具有改进的用于多射频发射系统的B1映射的翻转角成像
    • US20110026799A1
    • 2011-02-03
    • US12933897
    • 2009-03-26
    • Kay NehrkePeter BoernertTobias Ratko VoigtUlrich Katscher
    • Kay NehrkePeter BoernertTobias Ratko VoigtUlrich Katscher
    • G06K9/00
    • G01R33/586G01R33/246G01R33/3415G01R33/5612G01R33/56518G01R33/5659
    • 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.
    • 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。