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    Decoupling of Parallel Transmission Arrays in Magnetic Resonance Imaging
    4.
    发明申请
    Decoupling of Parallel Transmission Arrays in Magnetic Resonance Imaging 审中-公开
    并联传输阵列在磁共振成像中的去耦

    公开(公告)号：US20140292337A1

    公开(公告)日：2014-10-02

    申请号：US13918461

    申请日：2013-06-14

    申请人： Elfar Adalsteinsson ,  Luca Daniel ,  Bastien Guerin ,  Zohaib Mahmood ,  Markus Vester ,  Lawrence Wald

    发明人： Elfar Adalsteinsson ,  Luca Daniel ,  Bastien Guerin ,  Zohaib Mahmood ,  Markus Vester ,  Lawrence Wald

    IPC分类号： G01R33/36

    CPC分类号： G01R33/365 ,  G01R33/5612

    摘要： A method of determining a decoupling matrix of a decoupling system for an array of coils of a parallel transmission magnetic resonance imaging (MRI) system includes obtaining impedance matrix data for the array of coils without the decoupling system, determining, based on the impedance matrix data for the array of coils, an objective function representative of deviation from a decoupled operating condition for the array of coils in which the array of coils are decoupled via the decoupling system, and defining, with a processor, a decoupling matrix representative of a set of impedances of the decoupling system with an iterative procedure that optimizes elements of the decoupling matrix to minimize the objective function and reach the decoupled operating condition.

    摘要翻译： 确定并行传输磁共振成像（MRI）系统的线圈阵列的去耦系统的去耦矩阵的方法包括：获得用于没有去耦系统的线圈阵列的阻抗矩阵数据，基于阻抗矩阵数据 对于线圈阵列，表示偏离线圈阵列的去耦工作条件的目标函数，其中线圈阵列经由去耦系统去耦，并且用处理器定义代表一组线圈的去耦矩阵 解耦系统的阻抗具有优化去耦矩阵的元素以最小化目标函数并达到解耦操作条件的迭代过程。

    Local SAR reduction in multi-slice pTx via SAR-hopping between excitations
    5.
    发明授权
    Local SAR reduction in multi-slice pTx via SAR-hopping between excitations 有权
    通过激发之间的SAR跳跃，多层pTx中的局部SAR减少

    公开(公告)号：US09417298B2

    公开(公告)日：2016-08-16

    申请号：US13827700

    申请日：2013-03-14

    申请人： Bastien Guerin ,  Lawrence L. Wald ,  Elfar Adalsteinsson

    发明人： Bastien Guerin ,  Lawrence L. Wald ,  Elfar Adalsteinsson

    IPC分类号： G01R33/28 ,  G01R33/561 ,  G01R33/483

    CPC分类号： G01R33/288 ,  G01R33/4835 ,  G01R33/5612

    摘要： Described here are a system and method for designing radio frequency (“RF”) pulses for parallel transmission (“pTx”) applications, and particularly pTx applications in multislice magnetic resonance imaging (“MRI”). The concept of “SAR hopping” is implemented by framing the concept between slice-selective excitations as a constrained optimization problem that attempts designing multiple pulses simultaneously subject to an overall local SAR constraint. This results in the set of RF waveforms that yield the best excitation profiles for all pulses while ensuring that the local SAR of the average of all pulses is below the regulatory limit imposed by the FDA. Pulses are designed simultaneously while constraining local SAR, global SAR, and peak power, and average power explicitly.

    摘要翻译： 这里描述了用于并行传输（“pTx”）应用的射频（“RF”）脉冲的设计，特别是在多层磁共振成像（“MRI”）中的pTx应用的系统和方法。 “跳频跳频”的概念是通过将切片选择性激励之间的概念构成一个受约束的优化问题来实现的，这个约束优化问题在总体局域SAR约束下同时尝试同时设计多个脉冲。 这产生了一组RF波形，其产生所有脉冲的最佳激励曲线，同时确保所有脉冲的平均值的局部SAR低于FDA规定的限制。 同时设计脉冲，明确地限制局部SAR，全局SAR和峰值功率，平均功率。

    Local SAR Reduction In Multi-Slice pTx via SAR-Hopping Between Excitations
    6.
    发明申请
    Local SAR Reduction In Multi-Slice pTx via SAR-Hopping Between Excitations 有权
    通过激发之间的SAR跳跃，多片pTx中的局部SAR减少

    公开(公告)号：US20130300414A1

    公开(公告)日：2013-11-14

    申请号：US13827700

    申请日：2013-03-14

    申请人： Bastien Guerin ,  Lawrence L. Wald ,  Elfar Adalsteinsson

    发明人： Bastien Guerin ,  Lawrence L. Wald ,  Elfar Adalsteinsson

    IPC分类号： G01R33/28

    CPC分类号： G01R33/288 ,  G01R33/4835 ,  G01R33/5612

    摘要： Described here are a system and method for designing radio frequency (“RF”) pulses for parallel transmission (“pTx”) applications, and particularly pTx applications in multislice magnetic resonance imaging (“MRI”). The concept of “SAR hopping” is implemented by framing the concept between slice-selective excitations as a constrained optimization problem that attempts designing multiple pulses simultaneously subject to an overall local SAR constraint. This results in the set of RF waveforms that yield the best excitation profiles for all pulses while ensuring that the local SAR of the average of all pulses is below the regulatory limit imposed by the FDA. Pulses are designed simultaneously while constraining local SAR, global SAR, and peak power, and average power explicitly.

    摘要翻译： 这里描述了用于并行传输（“pTx”）应用的射频（“RF”）脉冲的设计，特别是在多层磁共振成像（“MRI”）中的pTx应用的系统和方法。 “跳频跳频”的概念是通过将切片选择性激励之间的概念构成一个受约束的优化问题来实现的，这个约束优化问题在总体局域SAR约束下同时尝试同时设计多个脉冲。 这产生了一组RF波形，其产生所有脉冲的最佳激励曲线，同时确保所有脉冲的平均值的局部SAR低于FDA规定的限制。 同时设计脉冲，明确地限制局部SAR，全局SAR和峰值功率，平均功率。

    System and Method For Hyperthermia Treatment Using Radiofrequency Phased Arrays
    7.
    发明申请
    System and Method For Hyperthermia Treatment Using Radiofrequency Phased Arrays 审中-公开
    使用射频相位阵列进行热疗治疗的系统和方法

    公开(公告)号：US20150273230A1

    公开(公告)日：2015-10-01

    申请号：US14668393

    申请日：2015-03-25

    申请人： Bastien Guerin ,  Lawrence L. Wald ,  Bruce Rosen

    发明人： Bastien Guerin ,  Lawrence L. Wald ,  Bruce Rosen

    IPC分类号： A61N1/40 ,  G06F17/16 ,  G06F17/50 ,  G01R33/36 ,  A61B19/00

    CPC分类号： A61N1/403 ,  G01R33/48 ,  G01R33/5612

    摘要： Systems and methods for designing parallel transmission radiofrequency (RF) pulses for use in a RF treatment. The methods include selecting a target region in a subject, and providing a plurality of specific absorption rate (SAR) matrices for estimation of SAR at locations within the subject. The methods also include determining a first set of SAR matrices for locations in the target region using the provided SAR matrices, and determining a second set of SAR matrices for locations not in the target region using the provided SAR matrices. The methods further include designing a plurality of RF pulses for achieving a target power deposition in the target region by using the first set of SAR matrices and the second set of SAR matrices in an optimization that determines a set of RF waveforms that produce a target average local SAR using the first set of SAR matrices while minimizing a local SAR and a global SAR using the second set of SAR matrices.

    摘要翻译： 设计用于RF处理的并行传输射频（RF）脉冲的系统和方法。 所述方法包括选择受试者中的目标区域，以及提供多个特定吸收率（SAR）矩阵，用于在受试者内的位置估计SAR。 所述方法还包括使用所提供的SAR矩阵来确定目标区域中的位置的第一组SAR矩阵，以及使用所提供的SAR矩阵来确定不在目标区域中的位置的第二组SAR矩阵。 所述方法还包括设计多个RF脉冲，以通过使用第一组SAR矩阵和在确定产生目标平均值的一组RF波形的优化中的第二组SAR矩阵来实现目标区域中的目标功率沉积 使用第一组SAR矩阵，同时使用第二组SAR矩阵最小化局部SAR和全局SAR。

    System and method for hyperthermia treatment using radiofrequency phased arrays
    8.
    发明授权
    System and method for hyperthermia treatment using radiofrequency phased arrays 有权

    公开(公告)号：US10661091B2

    公开(公告)日：2020-05-26

    申请号：US14668393

    申请日：2015-03-25

    申请人： Bastien Guerin ,  Lawrence L. Wald ,  Bruce Rosen

    发明人： Bastien Guerin ,  Lawrence L. Wald ,  Bruce Rosen

    IPC分类号： A61N1/40 ,  G01R33/48 ,  A61B34/10 ,  G01R33/561

    摘要： Systems and methods for designing parallel transmission radiofrequency (RF) pulses for use in a RF treatment. The methods include selecting a target region in a subject, and providing a plurality of specific absorption rate (SAR) matrices for estimation of SAR at locations within the subject. The methods also include determining a first set of SAR matrices for locations in the target region using the provided SAR matrices, and determining a second set of SAR matrices for locations not in the target region using the provided SAR matrices. The methods further include designing a plurality of RF pulses for achieving a target power deposition in the target region by using the first set of SAR matrices and the second set of SAR matrices in an optimization that determines a set of RF waveforms that produce a target average local SAR using the first set of SAR matrices while minimizing a local SAR and a global SAR using the second set of SAR matrices.