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公开(公告)号：US08339138B2
公开(公告)日：2012-12-25
申请号：US12580240
申请日：2009-10-15
IPC分类号： G01V3/00
CPC分类号： G01R33/385 , G01R33/288 , G01R33/4835
摘要： A composite gradient system is described, including a body gradient system and an insert gradient system, in which the body gradient system and the insert gradient system can be driven independently and simultaneously. The composite gradient system can provide an operator with the flexibility of imaging a subject using the body gradient system alone, the insert gradient system alone, or both gradient systems simultaneously, and therefore enjoy the advantages of each gradient system. In some embodiments, the body gradient system and the insert gradient system may be driven concurrently during an imaging sequence to produce composite magnetic field gradients having high amplitude and/or fast slew rate, resulting in high image resolution and/or fast image acquisition. In some embodiments, a subject may be imaged using the body gradient system alone while leaving the insert gradient system in place.
摘要翻译： 描述了复合梯度系统，包括身体梯度系统和插入梯度系统，其中身体梯度系统和插入梯度系统可以独立且同时地被驱动。 复合梯度系统可以为操作者提供使用单独的身体梯度系统，单独的插入梯度系统或两个梯度系统同时成像对象的灵活性，并因此享受每个梯度系统的优点。 在一些实施例中，身体梯度系统和插入梯度系统可以在成像序列期间同时被驱动以产生具有高振幅和/或快速转换速率的复合磁场梯度，导致高图像分辨率和/或快速图像采集。 在一些实施例中，可以使用身体梯度系统单独成像对象，同时使插入梯度系统保持在适当位置。
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2.发明授权公开(公告)号：US07884604B2
公开(公告)日：2011-02-08
申请号：US12414632
申请日：2009-03-30
CPC分类号： G01R33/5611
摘要： Methods and systems in a parallel magnetic resonance imaging (MRI) system utilize sensitivity-encoded MRI data acquired from multiple receiver coils together with spatially dependent receiver coil sensitivities to generate MRI images. The acquired MRI data forms a reduced MRI data set that is undersampled in at least a phase-encoding direction in a frequency domain. The acquired MRI data and auto-calibration signal data are used to determine reconstruction coefficients for each receiver coil using a weighted or a robust least squares method. The reconstruction coefficients vary spatially with respect to at least the spatial coordinate that is orthogonal to the undersampled, phase-encoding direction(s) (e.g., a frequency encoding direction). Values for unacquired MRI data are determined by linearly combining the reconstruction coefficients with the acquired MRI data within neighborhoods in the frequency domain that depend on imaging geometry, coil sensitivity characteristics, and the undersampling factor of the acquired MRI data. An MRI image is determined from the reconstructed unacquired data and the acquired MRI data.
摘要翻译： 并行磁共振成像（MRI）系统中的方法和系统利用从多个接收器线圈获取的灵敏度编码的MRI数据以及空间相关的接收器线圈灵敏度来产生MRI图像。 获取的MRI数据形成在频域中的至少相位编码方向上欠采样的减小的MRI数据集。 所获取的MRI数据和自动校准信号数据用于使用加权或鲁棒最小二乘法来确定每个接收器线圈的重建系数。 至少相对于欠采样的相位编码方向（例如，频率编码方向）正交的空间坐标，重建系数在空间上变化。 通过线性组合重构系数与取决于所获取的MRI数据的成像几何，线圈灵敏度特性和欠采样因子的频域中的邻域内的获取的MRI数据来确定未查询的MRI数据的值。 根据重建的无序数据和获取的MRI数据确定MRI图像。
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公开(公告)号：US20100102815A1
公开(公告)日：2010-04-29
申请号：US12580240
申请日：2009-10-15
IPC分类号： G01R33/48
CPC分类号： G01R33/385 , G01R33/288 , G01R33/4835
摘要： A composite gradient system is described, including a body gradient system and an insert gradient system, in which the body gradient system and the insert gradient system can be driven independently and simultaneously. The composite gradient system can provide an operator with the flexibility of imaging a subject using the body gradient system alone, the insert gradient system alone, or both gradient systems simultaneously, and therefore enjoy the advantages of each gradient system. In some embodiments, the body gradient system and the insert gradient system may be driven concurrently during an imaging sequence to produce composite magnetic field gradients having high amplitude and/or fast slew rate, resulting in high image resolution and/or fast image acquisition. In some embodiments, a subject may be imaged using the body gradient system alone while leaving the insert gradient system in place.
摘要翻译： 描述了复合梯度系统，包括身体梯度系统和插入梯度系统，其中身体梯度系统和插入梯度系统可以独立且同时地驱动。 复合梯度系统可以为操作者提供使用单独的身体梯度系统，单独的插入梯度系统或两个梯度系统同时成像对象的灵活性，并因此享受每个梯度系统的优点。 在一些实施例中，身体梯度系统和插入梯度系统可以在成像序列期间同时被驱动以产生具有高振幅和/或快速转换速率的复合磁场梯度，导致高图像分辨率和/或快速图像采集。 在一些实施例中，可以使用身体梯度系统单独成像对象，同时使插入梯度系统保持在适当位置。
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4.发明授权Systems and methods for image reconstruction of sensitivity encoded MRI data 有权用于图像重建的灵敏度编码MRI数据的系统和方法公开(公告)号：US07511495B2
公开(公告)日：2009-03-31
申请号：US11412073
申请日：2006-04-25
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： Methods and systems in a parallel magnetic resonance imaging (MRI) system utilize sensitivity-encoded MRI data acquired from multiple receiver coils together with spatially dependent receiver coil sensitivities to generate MRI images. The acquired MRI data forms a reduced MRI data set that is undersampled in at least a phase-encoding direction in a frequency domain. The acquired MRI data and auto-calibration signal data are used to determine reconstruction coefficients for each receiver coil using a weighted or a robust least squares method. The reconstruction coefficients vary spatially with respect to at least the spatial coordinate that is orthogonal to the undersampled, phase-encoding direction(s) (e.g., a frequency encoding direction). Values for unacquired MRI data are determined by linearly combining the reconstruction coefficients with the acquired MRI data within neighborhoods in the frequency domain that depend on imaging geometry, coil sensitivity characteristics, and the undersampling factor of the acquired MRI data. An MRI image is determined from the reconstructed unacquired data and the acquired MRI data.
摘要翻译： 并行磁共振成像（MRI）系统中的方法和系统利用从多个接收器线圈获取的灵敏度编码的MRI数据以及空间相关的接收器线圈灵敏度来产生MRI图像。 获取的MRI数据形成在频域中的至少相位编码方向上欠采样的减小的MRI数据集。 所获取的MRI数据和自动校准信号数据用于使用加权或鲁棒最小二乘法来确定每个接收器线圈的重建系数。 至少相对于欠采样的相位编码方向（例如，频率编码方向）正交的空间坐标，重建系数在空间上变化。 通过线性组合重构系数与取决于所获取的MRI数据的成像几何，线圈灵敏度特性和欠采样因子的频域中的邻域内的获取的MRI数据来确定未查询的MRI数据的值。 根据重建的无序数据和获取的MRI数据确定MRI图像。
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公开(公告)号：US08155389B2
公开(公告)日：2012-04-10
申请号：US12190287
申请日：2008-08-12
IPC分类号： G06K9/00
CPC分类号： G01R33/56509 , G01R33/561 , G01R33/5611 , G06T5/003 , G06T5/10 , G06T5/50 , G06T7/20 , G06T2207/10088 , G06T2207/20056 , G06T2207/20201 , G06T2207/30004
摘要： A method, a system, and a computer-readable medium are provided which perform motion correction of image data. A first set of data and a second set of data of k-space data of an object to be imaged are received. The first set of data and the second set of data include a plurality of phase encoded lines that encompass the object to be imaged. The first set of data correlates with the second set of data. A cross-correlation is calculated by multiplying the first set of data and the second set of data in k-space. A value of the motion of the object to be imaged that occurred between acquisition of the first set of data and acquisition of the second set of data is calculated using the cross-correlation. The second set of data is corrected using the calculated value to remove the motion. The correction process is repeated until the k-space data is completely processed.
摘要翻译： 提供了执行图像数据的运动校正的方法，系统和计算机可读介质。 接收要成像的对象的k空间数据的第一组数据和第二组数据。 第一组数据和第二组数据包括包含待成像对象的多个相位编码线。 第一组数据与第二组数据相关。 通过将第一组数据和第二组数据乘以k空间来计算互相关。 使用互相关来计算在获取第一组数据和获取第二组数据之间发生的待成像对象的运动的值。 第二组数据使用计算值进行修正以消除运动。 重复校正处理直到k空间数据被完全处理。
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6.发明申请SYSTEMS AND METHODS FOR IMAGE RECONSTRUCTION OF SENSITIVITY ENCODED MRI DATA 有权用于图像重建的灵敏度编码的MRI数据的系统和方法公开(公告)号：US20110084693A1
公开(公告)日：2011-04-14
申请号：US12972192
申请日：2010-12-17
IPC分类号： G01R33/44
CPC分类号： G01R33/5611
摘要： Methods and systems in a parallel magnetic resonance imaging (MRI) system utilize sensitivity-encoded MRI data acquired from multiple receiver coils together with spatially dependent receiver coil sensitivities to generate MRI images. The acquired MRI data forms a reduced MRI data set that is undersampled in at least a phase-encoding direction in a frequency domain. The acquired MRI data and auto-calibration signal data are used to determine reconstruction coefficients for each receiver coil using a weighted or a robust least squares method. The reconstruction coefficients vary spatially with respect to at least the spatial coordinate that is orthogonal to the undersampled, phase-encoding direction(s) (e.g., a frequency encoding direction). Values for unacquired MRI data are determined by linearly combining the reconstruction coefficients with the acquired MRI data within neighborhoods in the frequency domain that depend on imaging geometry, coil sensitivity characteristics, and the undersampling factor of the acquired MRI data. An MRI image is determined from the reconstructed unacquired data and the acquired MRI data.
摘要翻译： 并行磁共振成像（MRI）系统中的方法和系统利用从多个接收器线圈获取的灵敏度编码的MRI数据以及空间相关的接收器线圈灵敏度来产生MRI图像。 获取的MRI数据形成在频域中的至少相位编码方向上欠采样的减小的MRI数据集。 所获取的MRI数据和自动校准信号数据用于使用加权或鲁棒最小二乘法来确定每个接收器线圈的重建系数。 至少相对于欠采样的相位编码方向（例如，频率编码方向）正交的空间坐标，重建系数在空间上变化。 通过线性组合重构系数与取决于所获取的MRI数据的成像几何，线圈灵敏度特性和欠采样因子的频域中的邻域内的获取的MRI数据来确定未查询的MRI数据的值。 根据重建的无序数据和获取的MRI数据确定MRI图像。
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公开(公告)号：US08427156B2
公开(公告)日：2013-04-23
申请号：US12972192
申请日：2010-12-17
CPC分类号： G01R33/5611
摘要： Methods and systems in a parallel magnetic resonance imaging (MRI) system utilize sensitivity-encoded MRI data acquired from multiple receiver coils together with spatially dependent receiver coil sensitivities to generate MRI images. The acquired MRI data forms a reduced MRI data set that is undersampled in at least a phase-encoding direction in a frequency domain. The acquired MRI data and auto-calibration signal data are used to determine reconstruction coefficients for each receiver coil using a weighted or a robust least squares method. The reconstruction coefficients vary spatially with respect to at least the spatial coordinate that is orthogonal to the undersampled, phase-encoding direction(s) (e.g., a frequency encoding direction). Values for unacquired MRI data are determined by linearly combining the reconstruction coefficients with the acquired MRI data within neighborhoods in the frequency domain that depend on imaging geometry, coil sensitivity characteristics, and the undersampling factor of the acquired MRI data. An MRI image is determined from the reconstructed unacquired data and the acquired MRI data.
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8.发明申请公开(公告)号：US20090224759A1
公开(公告)日：2009-09-10
申请号：US12414632
申请日：2009-03-30
IPC分类号： G01R33/20
CPC分类号： G01R33/5611
摘要： Methods and systems in a parallel magnetic resonance imaging (MRI) system utilize sensitivity-encoded MRI data acquired from multiple receiver coils together with spatially dependent receiver coil sensitivities to generate MRI images. The acquired MRI data forms a reduced MRI data set that is undersampled in at least a phase-encoding direction in a frequency domain. The acquired MRI data and auto-calibration signal data are used to determine reconstruction coefficients for each receiver coil using a weighted or a robust least squares method. The reconstruction coefficients vary spatially with respect to at least the spatial coordinate that is orthogonal to the undersampled, phase-encoding direction(s) (e.g., a frequency encoding direction). Values for unacquired MRI data are determined by linearly combining the reconstruction coefficients with the acquired MRI data within neighborhoods in the frequency domain that depend on imaging geometry, coil sensitivity characteristics, and the undersampling factor of the acquired MRI data. An MRI image is determined from the reconstructed unacquired data and the acquired MRI data.
摘要翻译： 并行磁共振成像（MRI）系统中的方法和系统利用从多个接收器线圈获取的灵敏度编码的MRI数据以及空间相关的接收器线圈灵敏度来产生MRI图像。 获取的MRI数据形成在频域中的至少相位编码方向上欠采样的减小的MRI数据集。 所获取的MRI数据和自动校准信号数据用于使用加权或鲁棒最小二乘法来确定每个接收器线圈的重建系数。 至少相对于欠采样的相位编码方向（例如，频率编码方向）正交的空间坐标，重建系数在空间上变化。 通过线性组合重构系数与取决于所获取的MRI数据的成像几何，线圈灵敏度特性和欠采样因子的频域中的邻域内的获取的MRI数据来确定未查询的MRI数据的值。 根据重建的无序数据和获取的MRI数据确定MRI图像。
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公开(公告)号：US20090087057A1
公开(公告)日：2009-04-02
申请号：US12190287
申请日：2008-08-12
IPC分类号： G06K9/03
CPC分类号： G01R33/56509 , G01R33/561 , G01R33/5611 , G06T5/003 , G06T5/10 , G06T5/50 , G06T7/20 , G06T2207/10088 , G06T2207/20056 , G06T2207/20201 , G06T2207/30004
摘要： A method, a system, and a computer-readable medium are provided which perform motion correction of image data. A first set of data and a second set of data of k-space data of an object to be imaged are received. The first set of data and the second set of data include a plurality of phase encoded lines that encompass the object to be imaged. The first set of data correlates with the second set of data. A cross-correlation is calculated by multiplying the first set of data and the second set of data in k-space. A value of the motion of the object to be imaged that occurred between acquisition of the first set of data and acquisition of the second set of data is calculated using the cross-correlation. The second set of data is corrected using the calculated value to remove the motion. The correction process is repeated until the k-space data is completely processed.
摘要翻译： 提供了执行图像数据的运动校正的方法，系统和计算机可读介质。 接收要成像的对象的k空间数据的第一组数据和第二组数据。 第一组数据和第二组数据包括包含待成像对象的多个相位编码线。 第一组数据与第二组数据相关。 通过将第一组数据和第二组数据乘以k空间来计算互相关。 使用互相关来计算在获取第一组数据和获取第二组数据之间发生的待成像对象的运动的值。 第二组数据使用计算值进行修正以消除运动。 重复校正处理直到k空间数据被完全处理。
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