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    METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE
    1.
    发明公开
    METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE 有权
    法的局部能量比吸收率（SAR）的核磁计算的

    公开(公告)号：EP2519830A1

    公开(公告)日：2012-11-07

    申请号：EP10816380.9

    申请日：2010-12-28

    申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

    发明人： VOIGT, Tobias, Ratko ,  KATSCHER, Ulrich ,  HOMANN, Hanno, Heyke

    IPC分类号： G01R33/28 ,  G01R33/56 ,  G01R33/58

    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 B 1 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.

    ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM
    2.
    发明公开
    ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM 有权
    VERFAHREN UND系统ZUR BILDGEBUNG ELEKTRISCHER EIGENSCHAFTEN

    公开(公告)号：EP2526437A1

    公开(公告)日：2012-11-28

    申请号：EP11704668.0

    申请日：2011-01-13

    申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

    发明人： VOIGT, Tobias, Ratko ,  KATSCHER, Ulrich ,  ROZIJN, Thomas, Hendrik ,  HARVEY, Paul, Royston ,  HOMANN, Hanno, Heyke ,  FINDEKLEE, Christian ,  HANSIS, Eberhard, Sebastian

    IPC分类号： G01R33/48 ,  G01R33/14 ,  A61B5/055

    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).

    摘要翻译： 物体的电特性层析成像的磁共振方法包括通过第一空间线圈位置（402）处的线圈将激励RF场施加到对象，经由接收通道从对象获取所得到的磁共振信号，从 获取磁共振信号在第一线圈位置（402）处线圈的激励RF场的给定磁场分量的第一相位分布和第一幅度，在第二不同空间线圈位置（404）处用线圈重复这些步骤 ），以获得第二相位分布，确定第一和第二相位分布之间的相位差，确定对象的第一和第二复数介电常数，包括给定磁场分量的第一幅度和第二复数介电常数的第一复数介电常数 包括给定磁场分量的第二幅度和相位差等于的复介电常数 测量第一复介电常数和第二复介电常数以接收最终方程，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。