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    MR imaging using multi-channel RF excitation
    1.
    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。

    MR IMAGING USING MULTI-CHANNEL RF EXCITATION
    2.
    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。

    ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM
    3.
    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。

    Regularized variable density SENSE
    6.
    发明授权
    Regularized variable density SENSE 失效
    正则变量密度SENSE

    公开(公告)号：US07403005B2

    公开(公告)日：2008-07-22

    申请号：US10597060

    申请日：2005-01-05

    申请人： Ulrich Katscher ,  Johan Van Den Brink ,  Miha Fuderer

    发明人： Ulrich Katscher ,  Johan Van Den Brink ,  Miha Fuderer

    IPC分类号： G01V3/00

    CPC分类号： G01R33/4824 ,  G01R33/5608 ,  G01R33/5611

    摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.

    摘要翻译： 磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。 每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。 展开处理器（66）展开折叠的图像。 正规化图像正规化展开。

    Regularized variable density sense
    7.
    发明申请
    Regularized variable density sense 失效
    正则变量密度感

    公开(公告)号：US20070182412A1

    公开(公告)日：2007-08-09

    申请号：US10597060

    申请日：2005-01-05

    申请人： Ulrich Katscher ,  Johan Van Den Brink ,  Miha Fuderer

    发明人： Ulrich Katscher ,  Johan Van Den Brink ,  Miha Fuderer

    IPC分类号： G01V3/00

    CPC分类号： G01R33/4824 ,  G01R33/5608 ,  G01R33/5611

    摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.

    摘要翻译： 磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。 每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。 展开处理器（66）展开折叠的图像。 正规化图像正规化展开。

    REAL-TIME LOCAL AND GLOBAL SAR ESTIMATION FOR PATIENT SAFETY AND IMPROVED SCANNING PERFORMANCE
    8.
    发明申请
    REAL-TIME LOCAL AND GLOBAL SAR ESTIMATION FOR PATIENT SAFETY AND IMPROVED SCANNING PERFORMANCE 有权
    实时安全性和改进扫描性能的实时局部和全球SAR估计

    公开(公告)号：US20110043205A1

    公开(公告)日：2011-02-24

    申请号：US12936540

    申请日：2009-04-13

    申请人： Ingmar Graesslin ,  Sven Biederer ,  Ulrich Katscher ,  Ferdinand Schweser ,  Peter Boernert ,  Paul Royston Harvey ,  Wilhelmus Reinerius Maria Mens

    发明人： Ingmar Graesslin ,  Sven Biederer ,  Ulrich Katscher ,  Ferdinand Schweser ,  Peter Boernert ,  Paul Royston Harvey ,  Wilhelmus Reinerius Maria Mens

    IPC分类号： G01R33/44

    CPC分类号： G01R33/583 ,  G01R33/288 ,  G01R33/5612 ,  G01R33/5659

    摘要： In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor (36) calculates the local and global SAR or even a spatial SAR map. The efficient implementation by using pre-averaged data (based on E-fields) makes a fast and accurate SAR estimation possible. By incorporating additional information as e.g. patient position the SAR calculation accuracy can be increased as well as by using more patient specific precalculated information (e.g. based on different bio meshes), the so called Q-matrices. Optionally, a sequence controller (24) creates a global SAR optimal RF pulse. After the optimal RF pulse is applied, the SAR and its spatial distribution are determined. SAR hotspots are also determined. Q-matrices within an appropriate radius around the hotspots are averaged and added to a global Q-matrix in a weighted fashion. After the global Q-matrix is updated, a new optimal RF pulse is created. One or more of the steps can be repeated to converge the SAR to a minimum.

    摘要翻译： 在能够在高场MR扫描中增加RF占空比的方法和装置中，比能量吸收率（SAR）计算处理器（36）计算局部和全局SAR或甚至空间SAR图。 通过使用预平均数据（基于电场）的有效实现使得可以进行快速和准确的SAR估计。 通过结合附加信息，例如。 患者位置可以增加SAR计算精度，以及通过使用更多的患者特定的预先计算的信息（例如，基于不同的生物网格），即所谓的Q矩阵。 可选地，序列控制器（24）创建全局SAR最优RF脉冲。 在施加最佳RF脉冲之后，确定SAR及其空间分布。 SAR热点也是决定的。 在热点周围的适当半径内的Q矩阵被平均，并以加权的方式加到全局Q矩阵上。 在更新全局Q矩阵之后，创建一个新的最优RF脉冲。 可以重复一个或多个步骤以将SAR收敛到最小。

    FLIP ANGLE IMAGING WITH IMPROVED B1 MAPPING FOR MULTI-RF TRANSMIT SYSTEMS
    10.
    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。