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    • 6. 发明申请
    • METHOD AND APPARATUS FOR ADAPTIVE CHANNEL REDUCTION FOR PARALLEL IMAGING
    • 用于平行成像的自适应信道减少的方法和装置
    • WO2006122013A3
    • 2006-12-28
    • PCT/US2006017698
    • 2006-05-08
    • INVIVO CORPAKAO JAMES HDUENSING G RANDYFENG HUANG
    • AKAO JAMES HDUENSING G RANDYFENG HUANG
    • G01R33/561
    • G01R33/5611
    • The subject invention pertains to method and apparatus for parallel imaging. The subject method can be utilized with imaging systems utilizing parallel imaging techniques. In a specific embodiment, the subject invention can be used in magnetic resonance imaging (MRI). A specific embodiment of the subject invention can reduce parallel reconstruction CPU and system resources usage by reducing the number of channels employed in the parallel reconstruction from the M channel signals to a lower number of channel signals. In a specific embodiment, sensitivity map information can be used in the selection of the M channel signals to be used, and how the selected channel signals are to be combined, to create the output channel signals. In an embodiment, for a given set of radio-frequency (RF) elements, an optimal choice of reconstructed channel modes can be made using prior view information and/or sensitivity data for the given slice. The subject invention can utilize parallel imaging speed up in multiple directions.
    • 本发明涉及用于平行成像的方法和装置。 主题方法可以与利用平行成像技术的成像系统一起使用。 在一个具体的实施方案中,本发明可以用于磁共振成像(MRI)。 本发明的具体实施例可以通过将并行重建中采用的信道数量从M个信道信号减少到较少数量的信道信号来减少并行重构CPU和系统资源的使用。 在具体实施例中,灵敏度图信息可用于选择要使用的M声道信号以及如何组合所选择的声道信号以创建输出声道信号。 在一个实施例中,对于给定的一组射频(RF)元件,可以使用针对给定切片的先前视图信息和/或灵敏度数据来进行重构信道模式的最优选择。 本发明可以利用多个方向上的并行成像加速。
    • 7. 发明申请
    • TECHNIQUE FOR PARALLEL MRI IMAGING (K-T GRAPPA)
    • 平行MRI成像技术(K-T GRAPPA)
    • WO2006029240A3
    • 2007-11-22
    • PCT/US2005031934
    • 2005-09-06
    • INVIVO CORPHUANG FENG
    • HUANG FENG
    • G01R33/561
    • G01R33/5611G01R33/56308
    • The subject invention relates to a method for reconstructing a dynamic image series. Embodiments of the subject invention can be considered and/or referred to as a parallel imaging-prior-information imaging (parallel-prior) hybrid method. A specific embodiment can be referred to as k-t GRAPPA. The subject method can involve linear interpolation of data in k-t space. Linear interpolation of missing data in k-t space can exploit the correlation of the acquired data in both k-space and time. Several extra auto-calibration signal (ACS) lines can be acquired in each k-space scan and the correlation of the acquired data can be calculated based on the extra ACS lines. In an embodiment, ACS lines can be calculated based on other acquired data, such that values in an ACS line can be partially acquired and the unacquired values can be calculated and filled in based on the acquired values. In a preferred embodiment, no extra training data is used and no sensitivity map is used. In an embodiment, the extra ACS lines can be directly applied in the k-space to improve the image quality. Because the correlations exploited via the subject method are local and intrinsic, the subject method does not require that the sensitivity maps have no change during the acquisition. Advantageously, the subject method can be utilized when sensitivity maps change, preferably slowly, during the acquisition of the data.
    • 本发明涉及一种重建动态图像序列的方法。 可以将本发明的实施例视为和/或被称为并行成像先验信息成像(并行成像)并行成像(并行成像)。 具体实施方式可以称为k-t GRAPPA。 主题方法可以涉及k-t空间中数据的线性插值。 k-t空间中缺失数据的线性插值可以利用k-空间和时间两者之间获取的数据的相关性。 在每个k空间扫描中可以获取几个额外的自动校准信号(ACS)线,并且可以基于额外的ACS线来计算所获取的数据的相关性。 在一个实施例中,可以基于其他获取的数据来计算ACS线路,使得可以部分地获取ACS线路中的值,并且可以基于获取的值来计算和填充未认证的值。 在优选实施例中,不使用额外的训练数据,并且不使用灵敏度图。 在一个实施例中,额外的ACS线可以直接应用于k空间以提高图像质量。 因为通过主题方法利用的相关性是局部和内在的,所以本方法不要求在获取期间灵敏度图没有变化。 有利地,当灵敏度图在数据获取期间更好地缓慢地改变时,可以利用本方法。
    • 8. 发明申请
    • HIGH FIELD HEAD COIL FOR DUAL-MODE OPERATION IN MAGNETIC RESONANCE IMAGING
    • 用于磁共振成像中双模操作的高场线圈
    • WO2006076739A2
    • 2006-07-20
    • PCT/US2006002101
    • 2006-01-17
    • INVIVO CORPSAYLOR CHARLES ALI YU
    • SAYLOR CHARLES ALI YU
    • G01R33/3415G01R33/34
    • G01R33/3415G01R33/34046G01R33/3642G01R33/365
    • Embodiments of the subject invention can utilize a single coil structure for dual-mode operation. In a specific embodiment, a single coil structure can be used as a volume coil in the transmitting phase and as a phase array in the receiving phase. In an embodiment, a transmit coil array in accordance with the subject invention can be utilized for one or more of the following: 1) parallel RF excitation on an MRI scanner equipped with a multiple-channel transmitter; 2) serial RF excitation with the use of a switch system with a single channel transmitter; and 3) generation of a homogeneous B1 field for regular MRI with the use of a power splitter on a standard scanner. In a specific embodiment, the use of a concentric double loop coil with different tunings of inner and outer loops can be implemented. In an embodiment, the coil elements can be decoupled using the CRC mode of a concentric double loop coil. In an embodiment, a surface coil transmit array can provide better compatibility with a receive array. In a specific embodiment, an over-coupled technique can be used to improve the phase control of the transmitting pulse.
    • 本发明的实施例可以利用单线圈结构进行双模操作。 在具体实施例中,单个线圈结构可以用作发射相位中的体积线圈,并且在接收阶段中用作相位阵列。 在一个实施例中,根据本发明的发射线圈阵列可用于以下一个或多个:1)配备有多通道发射器的MRI扫描器上的并行RF激励; 2)使用具有单通道发射器的开关系统进行串行RF激励; 和3)在标准扫描仪上使用功率分配器产生用于常规MRI的均匀B1场。 在具体实施例中,可以实现具有内圈和外圈的不同调谐的同心双环线圈的使用。 在一个实施例中,线圈元件可以使用同心双环线圈的CRC模式去耦合。 在一个实施例中,表面线圈发射阵列可以提供与接收阵列更好的兼容性。 在具体实施例中,可以使用过耦合技术来改善发射脉冲的相位控制。