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1. 发明授权

US08154289B2 Method for joint sparsity-enforced k-space trajectory and radiofrequency pulse design 有权
标题翻译：联合稀疏强制k空间轨迹和射频脉冲设计方法
公开(公告)号：US08154289B2
公开(公告)日：2012-04-10
申请号：US12422512
申请日：2009-04-13
申请人： Adam C. Zelinski , Lawrence Wald , Elfar Adalsteinsson , Vivek K Goyal
发明人： Adam C. Zelinski , Lawrence Wald , Elfar Adalsteinsson , Vivek K Goyal
IPC分类号： G01V3/00
CPC分类号： G01R33/561 , G01R33/4824 , G01R33/4836 , G01R33/5611 , G01R33/5612
摘要： A system and method is provided for simultaneously designing a radiofrequency (“RF”) pulse waveform and a magnetic field gradient waveform in a magnetic resonance imaging (“MRI”) system. The method includes determining a desired pattern of RF excitation and determining, from the desired pattern of RF excitation, a plurality of k-space locations indicative of the magnetic field gradient waveform and a plurality of complex weighting factors indicative of RF energy deposited at each k-space location. The method also includes calculating, from the determined k-space locations, the magnetic field gradient waveform and calculating, from the complex weighting factors, the RF pulse waveform that will produce the desired pattern of RF excitation when produced with the calculated magnetic field gradient.
摘要翻译：提供了一种在磁共振成像（“MRI”）系统中同时设计射频（“RF”）脉冲波形和磁场梯度波形的系统和方法。该方法包括确定期望的RF激励模式，并根据所需的RF激励模式确定表示磁场梯度波形的多个k空间位置以及指示在每个k处沉积RF能量的多个复加权系数 - 空间位置。该方法还包括从确定的k空间位置计算磁场梯度波形，并从复数加权因子计算当用所计算的磁场梯度产生时将产生期望的RF激励模式的RF脉冲波形。

2. 发明申请

US20090256570A1 Method For Joint Sparsity-Enforced K-Space Trajectory and Radiofrequency Pulse Design 有权
标题翻译：联合稀疏强制K空间轨迹和射频脉冲设计方法
公开(公告)号：US20090256570A1
公开(公告)日：2009-10-15
申请号：US12422512
申请日：2009-04-13
申请人： Adam C. Zelinski , Lawrence Wald , Elfar Adalsteinsson , Vivek K. Goyal
发明人： Adam C. Zelinski , Lawrence Wald , Elfar Adalsteinsson , Vivek K. Goyal
IPC分类号： G01R33/32
CPC分类号： G01R33/561 , G01R33/4824 , G01R33/4836 , G01R33/5611 , G01R33/5612
摘要： A system and method is provided for simultaneously designing a radiofrequency (“RF”) pulse waveform and a magnetic field gradient waveform in a magnetic resonance imaging (“MRI”) system. The method includes determining a desired pattern of RF excitation and determining, from the desired pattern of RF excitation, a plurality of k-space locations indicative of the magnetic field gradient waveform and a plurality of complex weighting factors indicative of RF energy deposited at each k-space location. The method also includes calculating, from the determined k-space locations, the magnetic field gradient waveform and calculating, from the complex weighting factors, the RF pulse waveform that will produce the desired pattern of RF excitation when produced with the calculated magnetic field gradient.
摘要翻译：提供了一种在磁共振成像（“MRI”）系统中同时设计射频（“RF”）脉冲波形和磁场梯度波形的系统和方法。该方法包括确定期望的RF激励模式，并根据所需的RF激励模式确定表示磁场梯度波形的多个k空间位置以及指示在每个k处沉积RF能量的多个复加权系数 - 空间位置。该方法还包括从确定的k空间位置计算磁场梯度波形，并从复数加权因子计算当用所计算的磁场梯度产生时将产生期望的RF激励模式的RF脉冲波形。

3. 发明申请

US20100052679A1 Coil Array Mode Compression For Parallel Transmission Magnetic Resonance Imaging 有权
标题翻译：线圈阵列模式压缩用于并行传输磁共振成像
公开(公告)号：US20100052679A1
公开(公告)日：2010-03-04
申请号：US12550074
申请日：2009-08-28
申请人： Adam C. Zelinski , Lawrence L. Wald , Elfar Adalsteinsson , Vivek K. Goyal , Vijay Alagappan
发明人： Adam C. Zelinski , Lawrence L. Wald , Elfar Adalsteinsson , Vivek K. Goyal , Vijay Alagappan
IPC分类号： G01R33/48
CPC分类号： G01R33/5611 , G01R33/3664 , G01R33/4833 , G01R33/4836 , G01R33/5612
摘要： A method for target-dependent, sparsity-enforced selection for choosing a substantially optimal connection of radiofrequency (“RF”) transmitters to the elements of the RF coil array is provided. In particular, a method is provided that selects the linear combinations of the “N” spatial mode profiles of a transmission RF coil array, such that the k-space trajectory and pulse duration acceleration capabilities of the array are advantageously utilized. A sparsity-enforcement method that determines a subset of the available spatial modes for a parallel transmission RF coil array is employed to this end. In this manner, the utilization of the encoding power of a highly-parallel N-mode coil array in a system with only “P” available excitation channels is enabled.
摘要翻译：提供了用于选择用于选择射频（RF））发射机到RF线圈阵列的元件的基本上最佳连接的目标依赖，稀疏执行选择的方法。具体地，提供了一种选择发射RF线圈阵列的“N”个空间模式分布的线性组合的方法，使得有利地利用阵列的k空间轨迹和脉冲持续时间加速能力。为此，采用了稀疏执行方法来确定并行传输RF线圈阵列的可用空间模式的子集。以这种方式，能够在仅具有“P”可用激励信道的系统中利用高并行N模式线圈阵列的编码功率。

4. 发明申请

US20100134105A1 Method For Reducing Maximum Local Specific Absorption Rate In Magnetic Resonance Imaging 有权
标题翻译：降低磁共振成像最大局部比吸收率的方法
公开(公告)号：US20100134105A1
公开(公告)日：2010-06-03
申请号：US12580076
申请日：2009-10-15
申请人： Adam C. Zelinski , Kawin Setsompop , Elfar Adalsteinsson , Vivek Goyal
发明人： Adam C. Zelinski , Kawin Setsompop , Elfar Adalsteinsson , Vivek Goyal
IPC分类号： G01R33/48
CPC分类号： G01R33/583 , G01R33/288 , G01R33/5612
摘要： A method for reducing maximum local specific absorption rate (“SAR”) in a magnetic resonance imaging (“MRI”) system is disclosed. More specifically, a plurality of candidate radio frequency (“RF”) pulses are designed and the manner in which they are applied to a subject is determined such that the maximum local SAR is substantially reduced relative to applying the candidate RF pulse that produces the lowest maximum local SAR alone. Put another way, this “time-multiplexing” of a set of RF pulses that each produce approximately the same excitation pattern yields a lower maximum local SAR than does transmitting the individual RF pulse having the lowest local SAR over many repetition times (“TRs”). A convex optimization method is utilized to determine the manner in which the RF pulses are multiplexed in time such that a substantially lower maximum local SAR is achieved.
摘要翻译：公开了一种在磁共振成像（“MRI”）系统中降低最大局部比吸收率（“SAR”）的方法。更具体地，设计多个候选射频（“RF”）脉冲，并且确定它们被施加到被摄体的方式，使得最大局部SAR相对于施加产生最低的候选射频脉冲而显着减小最大的地方特区。换句话说，每个产生大致相同的激励模式的一组RF脉冲的这种“时间复用”产生比在许多重复时间（“TR”）发送具有最低局部SAR的单个RF脉冲的最小局部SAR更低的最小局部SAR，）。使用凸优化方法来确定RF脉冲在时间上多路复用的方式，使得实现基本上较低的最大局部SAR。

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