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    Electrical conductor arrangement
    5.
    发明授权
    Electrical conductor arrangement 有权
    电导体布置

    公开(公告)号：US06492817B2

    公开(公告)日：2002-12-10

    申请号：US09861759

    申请日：2001-05-21

    Applicant: Matthias Gebhardt ,  Ralph Oppelt ,  Markus Vester

    Inventor： Matthias Gebhardt ,  Ralph Oppelt ,  Markus Vester

    IPC: G01V300

    CPC classification number: G01R33/28

    Abstract: An electrical conductor arrangement has conductor meshes that are arranged in areas with limiting lines defined by a network structure, and into which control devices are connected for the control of currents within the conductor arrangement.

    Abstract translation: 电导体布置具有布置在由网络结构限定的限制线的区域中的导体网格，并且其中连接有控制装置以控制导体布置内的电流。

    SAR calculation for multichannel MR transmission systems
    6.
    发明授权
    SAR calculation for multichannel MR transmission systems 有权
    多通道MR传输系统的SAR计算

    公开(公告)号：US08547097B2

    公开(公告)日：2013-10-01

    申请号：US12823177

    申请日：2010-06-25

    Applicant: Matthias Gebhardt ,  Markus Vester

    Inventor： Matthias Gebhardt ,  Markus Vester

    IPC: G01V3/00 ,  G01R33/48

    CPC classification number: G01R33/288 ,  G01R33/3415 ,  G01R33/5612

    Abstract: In a device and a method to determine SAR for a magnetic resonance tomography transmission system with multiple antenna elements, a single-column cross-correlation matrix of an antenna element matrix of antenna element values of multiple antenna elements of the magnetic resonance tomography transmission system is determined for each of multiple points in time or time periods. These single-column cross-correlation matrices are added into a sum cross-correlation matrix over a summation time period and the sum cross-correlation matrix is multiplied with a hotspot sensitivity matrix. The hotspot sensitivity matrix represents the sensitivities in at least one direction at a number of hotspot points in a subject located in the magnetic resonance tomography transmission system. The product of the sum cross-correlation matrix and the hotspot sensitivity matrix is multiplied with a value representing the dielectricity at least one hotspot point in order to determine a respective SAR value for hotspot points. If at least one SAR value exceeds a predetermined upper limit, the voltage applied to at least one antenna element or the current flowing in at least one antenna element is reduced or deactivated.

    Abstract translation: 在用于确定具有多个天线元件的磁共振断层摄影传输系统的SAR的装置和方法中，磁共振断层摄影传输系统的多个天线元件的天线元素值的天线元素矩阵的单列互相关矩阵是 确定在时间或时间段的多个点的每个。 这些单列互相关矩阵通过求和时间周期加到和互相关矩阵中，并且和互相关矩阵乘以热点灵敏度矩阵。 热点灵敏度矩阵表示在位于磁共振断层摄影传输系统中的被摄体的多个热点处的至少一个方向上的灵敏度。 将和互相关矩阵和热点灵敏度矩阵的乘积乘以表示至少一个热点的电介质的值，以便确定热点的相应SAR值。 如果至少一个SAR值超过预定的上限，则施加到至少一个天线元件的电压或者在至少一个天线元件中流动的电流被减少或去激活。

    SAR CALCULATION FOR MULTICHANNEL MR TRANSMISSION SYSTEMS
    7.
    发明申请
    SAR CALCULATION FOR MULTICHANNEL MR TRANSMISSION SYSTEMS 有权
    多通道MR传输系统的SAR计算

    公开(公告)号：US20100327868A1

    公开(公告)日：2010-12-30

    申请号：US12823177

    申请日：2010-06-25

    Applicant: Matthias Gebhardt ,  Markus Vester

    Inventor： Matthias Gebhardt ,  Markus Vester

    IPC: G01R33/44

    CPC classification number: G01R33/288 ,  G01R33/3415 ,  G01R33/5612

    Abstract: In a device and a method to determine SAR for a magnetic resonance tomography transmission system with multiple antenna elements, a single-column cross-correlation matrix of an antenna element matrix of antenna element values of multiple antenna elements of the magnetic resonance tomography transmission system is determined for each of multiple points in time or time periods. These single-column cross-correlation matrices are added into a sum cross-correlation matrix over a summation time period and the sum cross-correlation matrix is multiplied with a hotspot sensitivity matrix. The hotspot sensitivity matrix represents the sensitivities in at least one direction at a number of hotspot points in a subject located in the magnetic resonance tomography transmission system. The product of the sum cross-correlation matrix and the hotspot sensitivity matrix is multiplied with a value representing the dielectricity at least one hotspot point in order to determine a respective SAR value for hotspot points. If at least one SAR value exceeds a predetermined upper limit, the voltage applied to at least one antenna element or the current flowing in at least one antenna element is reduced or deactivated.

    Abstract translation: 在用于确定具有多个天线元件的磁共振断层摄影传输系统的SAR的装置和方法中，磁共振断层摄影传输系统的多个天线元件的天线元素值的天线元素矩阵的单列互相关矩阵是 确定在时间或时间段的多个点的每个。 这些单列互相关矩阵通过求和时间周期加到和互相关矩阵中，并且和互相关矩阵乘以热点灵敏度矩阵。 热点灵敏度矩阵表示在位于磁共振断层摄影传输系统中的被摄体的多个热点处的至少一个方向上的灵敏度。 将和互相关矩阵和热点灵敏度矩阵的乘积乘以表示至少一个热点的电介质的值，以便确定热点的相应SAR值。 如果至少一个SAR值超过预定的上限，则施加到至少一个天线元件的电压或者在至少一个天线元件中流动的电流被减小或去激活。

    Method and device for selecting body model positions for SAR monitoring of a magnetic resonance transmit array
    8.
    发明授权
    Method and device for selecting body model positions for SAR monitoring of a magnetic resonance transmit array 有权
    用于选择磁共振发射阵列的SAR监测的身体模型位置的方法和装置

    公开(公告)号：US08461838B2

    公开(公告)日：2013-06-11

    申请号：US12793866

    申请日：2010-06-04

    Applicant: Gerhard Brinker ,  Dirk Diehl ,  Matthias Gebhardt ,  Juergen Nistler ,  Volker Schnetter

    Inventor： Gerhard Brinker ,  Dirk Diehl ,  Matthias Gebhardt ,  Juergen Nistler ,  Volker Schnetter

    IPC: G01V3/00

    CPC classification number: G01R33/288 ,  G01R33/5612

    Abstract: In a method and a device for specific absorption rate monitoring in a magnetic resonance system wherein multiple transmit coils are independently charged with respective currents, a primary model point voxel and at least one auxiliary model point voxel are automatically selected from among multiple voxels that model a modeled examination subject. The primary model point voxel is that voxel in which an absolute maximum of a total field variable occurs that is produced by the respective electrical fields emitted by the transmit coils. The at least one auxiliary model point voxel is that voxel in which a relative maximum of the variable occurs. The primary model point voxel and the at least one auxiliary model point voxel are stored, and specific absorption rate monitoring of an actual examination subject in the magnetic resonance system is implemented during the acquisition of magnetic resonance data in respective voxels of the actual examination subject corresponding to the stored primary model point voxel and the stored at least one auxiliary model point voxel.

    Abstract translation: 在磁共振系统中用于特定吸收率监测的方法和装置中，其中多个发射线圈被各自的电流独立地充电，主要模型点体素和至少一个辅助模型点体素从模型化的多个体素中自动选择 建模考试科目。 主要模型点体素是其中发生由发射线圈发射的各个电场产生的总场变量的绝对最大值的体素。 至少一个辅助模型点体素是其中发生变量的相对最大值的体素。 存储主要模型点体素和至少一个辅助模型点体素，并且在实际检查对象的相应体素获取磁共振数据期间实现磁共振系统中实际检查对象的特定吸收率监测 到存储的主模型点体素和存储的至少一个辅助模型点体素。

    Local SAR Constrained Parallel Transmission RF Pulse in Magnetic Resonance Imaging
    9.
    发明申请
    Local SAR Constrained Parallel Transmission RF Pulse in Magnetic Resonance Imaging 审中-公开
    局部SAR约束并行传输RF脉冲在磁共振成像

    公开(公告)号：US20130063143A1

    公开(公告)日：2013-03-14

    申请号：US13601385

    申请日：2012-08-31

    Applicant: Elfar Adalsteinsson ,  Matthias Gebhardt ,  Joonsung Lee ,  Lawrence L. Wald

    Inventor： Elfar Adalsteinsson ,  Matthias Gebhardt ,  Joonsung Lee ,  Lawrence L. Wald

    IPC: G01R33/48 ,  G06F17/10

    CPC classification number: G01R33/5612 ,  G01R33/288

    Abstract: A method of designing a parallel transmission radio frequency (RF) pulse for a magnetic resonance imaging (MRI) system includes compressing a model for a subject to be scanned by the MRI system into a plurality of virtual observation points within the model based on comparisons of peak sensitivity to local specific absorption rate (SAR), and defining the parallel transmission RF pulse that minimizes a weighted average of local SAR values with an iterative procedure that optimizes a set of weighting factors for the plurality of virtual observation points to maximize the minimized weighted average.

    Abstract translation: 设计用于磁共振成像（MRI）系统的并行传输射频（RF）脉冲的方法包括将由MRI系统扫描的对象的模型压缩到模型内的多个虚拟观察点中，基于 对局部特异吸收率（SAR）的峰值灵敏度，以及定义使局部SAR值的加权平均值最小化的并行传输RF脉冲，其中迭代过程优化多个虚拟观测点的一组加权因子，以使最小化加权 平均。

    MAGNETIC RESONANCE SYSTEM HAVING VARIABLE FREQUENCY TRANSMIT PULSES
    10.
    发明申请
    MAGNETIC RESONANCE SYSTEM HAVING VARIABLE FREQUENCY TRANSMIT PULSES 有权
    具有可变频率发射脉冲的磁共振系统

    公开(公告)号：US20130038329A1

    公开(公告)日：2013-02-14

    申请号：US13569034

    申请日：2012-08-07

    Applicant: Matthias Gebhardt ,  Josef Pfeuffer ,  Thorsten Speckner

    Inventor： Matthias Gebhardt ,  Josef Pfeuffer ,  Thorsten Speckner

    IPC: G01R33/32

    CPC classification number: G01R33/3607

    Abstract: A controller of a magnetic resonance system outputs a low frequency base signal to a conversion device. While outputting the base signal to the conversion device, the controller outputs an oscillator control signal to an oscillator. The oscillator outputs a frequency signal corresponding to the oscillator control signal to the conversion device. The conversion device converts the frequency signal into a high frequency transmit pulse with the aid of the base signal and outputs the transmit pulse to a magnetic resonance transmit antenna. The magnetic resonance transmit antenna applies a high frequency field corresponding to a transmit pulse to an examination volume of the magnetic resonance system. The controller varies the oscillator control signal output to the oscillator while outputting the base signal to the modulator. The transmit pulse) has a larger bandwidth than the base signal.

    Abstract translation: 磁共振系统的控制器向转换装置输出低频基准信号。 在将基本信号输出到转换装置的同时，控制器向振荡器输出振荡器控制信号。 振荡器将与振荡器控制信号对应的频率信号输出到转换装置。 转换装置借助于基本信号将频率信号转换成高频发射脉冲，并将发射脉冲输出到磁共振发射天线。 磁共振发射天线将对应于发射脉冲的高频场施加到磁共振系统的检查体积。 控制器将输出到振荡器的振荡器控制信号改变，同时将基本信号输出到调制器。 发送脉冲）具有比基本信号更大的带宽。

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