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公开(公告)号：US07295008B2
公开(公告)日：2007-11-13
申请号：US11540164
申请日：2006-09-29
IPC分类号： G01V3/00
CPC分类号： G01R33/565 , G01R33/3415 , G01R33/5659
摘要： In the operation of a magnetic resonance system, an RF excitation coil emits an excitation pulse such that nuclei in an examination subject are excited to emit of magnetic resonance signals. A number of local coils acquire the magnetic resonance signals emitted from the examination subject, with the magnetic resonance signals acquired by the local coils being coded in frequency space. An evaluation device accepts the magnetic resonance signals acquired by the local coils or accepts intermediate signals derived therefrom via one transmission channel per signal, and corrects the accepted signals using correction signals. The evaluation device uses the corrected signals reconstructing an image of the examination subject. The evaluation device determines the correction signals for all signals to be corrected using the same reference signal.
摘要翻译： 在磁共振系统的操作中，RF激励线圈发射激励脉冲，使得激励检查对象中的核发出磁共振信号。 多个本地线圈获取从检查对象发射的磁共振信号，由本地线圈获取的磁共振信号在频率空间中编码。 评估装置接受本地线圈获取的磁共振信号，或者通过每个信号经由一个传输信道接收从其导出的中间信号，并使用校正信号来校正接受的信号。 评估装置使用重建检查对象的图像的校正信号。 评估装置使用相同的参考信号确定要校正的所有信号的校正信号。
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2.发明申请Method for MRT imaging on the basis of conventional PPA reconstruction methods 有权基于常规PPA重建方法的MRT成像方法公开(公告)号：US20060284812A1
公开(公告)日：2006-12-21
申请号：US11409373
申请日：2006-04-21
IPC分类号： G09G3/36
CPC分类号： G01R33/5611
摘要： In a method and apparatus for generating a magnetic resonance image of a contiguous region of a human body on the basis of partial parallel acquisition (PPA) by excitation of nuclear spins and measurement of radio-frequency signals indicating the excited spins, the spin excitation is implemented in steps with measurement of an RF response signal simultaneously in each of a number of N component coils. a number of response signals thus are acquired that, for each component coil, form an incomplete data set (40) of acquired RF signals. Additional acquired calibration data points exist for each incomplete data set. The N incomplete data sets are acquired to a subset of M reduced, incomplete data sets on the basis of an N×M reduction matrix, so that M reduced, incomplete data sets are obtained, M complete data sets are formed on the basis of an N×M reconstruction matrix with the non-measured lines of the M reduced, incomplete data sets being reconstructed from all N incomplete data sets. A spatial transformation of the completed reduced data sets is then implemented in order to form a complete image data set from each completed, reduced data set.
摘要翻译： 在通过激励核自旋的部分并行采集（PPA）和表示激发的自旋的射频信号的测量来产生人体的连续区域的磁共振图像的方法和装置中，自旋激发是 在多个N个分量线圈的每一个中同时测量RF响应信号的步骤实现。 因此，对于每个分量线圈，获得多个响应信号，形成所获取的RF信号的不完整数据集（40）。 对于每个不完整的数据集，存在额外的获取的校准数据点。 N个不完整的数据集基于N×M个缩减矩阵被获取到M个不完整的数据集的子集，从而获得M个减少的不完整的数据集，M个完整数据集是基于N×M重建形成的 矩阵，其中M个未测量的线减少，不完整的数据集从所有N个不完整的数据集重建。 然后实现完成的缩减数据集的空间变换，以便从每个完成的简化数据集合形成完整的图像数据集。
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3.发明授权Method for MRT imaging on the basis of conventional PPA reconstruction methods 有权基于常规PPA重建方法的MRT成像方法公开(公告)号：US07495437B2
公开(公告)日：2009-02-24
申请号：US11409373
申请日：2006-04-21
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： In a method and apparatus for generating a magnetic resonance image of a contiguous region of a human body on the basis of partial parallel acquisition (PPA) by excitation of nuclear spins and measurement of radio-frequency signals indicating the excited spins, the spin excitation is implemented in steps with measurement of an RF response signal simultaneously in each of a number of N component coils. A number of response signals thus are acquired that, for each component coil, form an incomplete data set (40) of acquired RF signals. Additional acquired calibration data points exist for each incomplete data set. The N incomplete data sets are acquired to a subset of M reduced, incomplete data sets on the basis of an N×M reduction matrix, so that M reduced, incomplete data sets are obtained, M complete data sets are formed on the basis of an N×M reconstruction matrix with the non-measured lines of the M reduced, incomplete data sets being reconstructed from all N incomplete data sets. A spatial transformation of the completed reduced data sets is then implemented in order to form a complete image data set from each completed, reduced data set.
摘要翻译： 在通过激励核自旋的部分并行采集（PPA）和表示激发的自旋的射频信号的测量来产生人体的连续区域的磁共振图像的方法和装置中，自旋激发是 在多个N个分量线圈的每一个中同时测量RF响应信号的步骤实现。 因此，获得多个响应信号，对于每个分量线圈，形成所获取的RF信号的不完整数据集（40）。 对于每个不完整的数据集，存在额外的获取的校准数据点。 N个不完整的数据集基于N×M个缩减矩阵被获取到M个不完整的数据集的子集，从而获得M个减少的不完整的数据集，M个完整数据集是基于N×M重建形成的 矩阵，其中M个未测量的线减少，不完整的数据集从所有N个不完整的数据集重建。 然后实现完成的缩减数据集的空间变换，以便从每个完成的简化数据集合形成完整的图像数据集。
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公开(公告)号：US20070085536A1
公开(公告)日：2007-04-19
申请号：US11540164
申请日：2006-09-29
IPC分类号： G01V3/00
CPC分类号： G01R33/565 , G01R33/3415 , G01R33/5659
摘要： In the operation of a magnetic resonance system, an RF excitation coil emits an excitation pulse such that nuclei in an examination subject are excited to emit of magnetic resonance signals. A number of local coils acquire the magnetic resonance signals emitted from the examination subject, with the magnetic resonance signals acquired by the local coils being coded in frequency space. An evaluation device accepts the magnetic resonance signals acquired by the local coils or accepts intermediate signals derived therefrom via one transmission channel per signal, and corrects the accepted signals using correction signals. The evaluation device uses the corrected signals reconstructing an image of the examination subject. The evaluation device determines the correction signals for all signals to be corrected using the same reference signal.
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5.发明授权Magnetic resonance method and device to automatically differentiate water-dominated and fat-dominated tissue with only one spin echo acquired for each pixel 有权磁共振方法和装置自动区分以水为主和脂肪为主的组织，每个像素仅获得一个自旋回波公开(公告)号：US08362769B2
公开(公告)日：2013-01-29
申请号：US12564272
申请日：2009-09-22
IPC分类号： G01V3/00
CPC分类号： G01R33/4828 , G01R33/481
摘要： In a magnetic resonance method and system to automatically differentiate whether a pixel of an MR image acquired with magnetic resonance system originated from fat-dominated tissue or water-dominated tissue, only one spin echo-based magnetic resonance signal per pixel is acquired at a point in time at which the phase of a magnetic resonance signal of aqueous tissue has a phase opposite to the phase of a magnetic resonance signal of fat tissue. The phase angle of the pixel is then calculated, a base phase at the pixel depending on the magnetic resonance system is determined, and a corrected phase angle of the pixel is determined from the phase angle and the base phase. Whether the pixel originated from fat-dominated tissue or water-dominated tissue is then determined using the corrected phase angle of the pixel.
摘要翻译： 在磁共振方法和系统中，用于自动区分由磁共振系统获取的MR图像的像素是源自脂肪占主导的组织还是以水为主的组织，仅在每个像素点处仅获得一个基于自旋回波的磁共振信号 水分组织的磁共振信号的相位与脂肪组织的磁共振信号的相位相反的时间。 然后计算像素的相位角，确定取决于磁共振系统的像素处的基极相位，并且从相位角和基极相位确定像素的校正相位角。 然后使用像素的校正相位角来确定来自以脂肪为主的组织或以水为主的组织的像素。
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公开(公告)号：US20120119737A1
公开(公告)日：2012-05-17
申请号：US12947295
申请日：2010-11-16
申请人： Vladimir Jellus
发明人： Vladimir Jellus
IPC分类号： G01R33/48
CPC分类号： G01R33/56 , G01R33/3415 , G01R33/561 , G01R33/5659
摘要： In a method and magnetic resonance system to determine a magnetic resonance (MR) image of an examination subject, wherein multiple coil-specific MR data sets that are acquired by multiple coils are used for the MR image. Each pixel of the MR image is determined from at least two coil-specific MR data sets of different coils (6-10), and each pixel has a pixel magnitude and a pixel phase. Multiple coil-specific base phases are determined that are respectively associated with one of the multiple coils. For each pixel multiple coil-specific pixel, magnitudes and multiple pixel phases are determined. A coil-specific pixel magnitude and a coil-specific pixel phase are respectively determined from a coil-specific MR data set of one of the multiple coils (7-10). The coil-specific pixel phases with the corresponding, coil-specific base phase, and the multiple coil-specific pixel magnitudes and the multiple coil-specific pixel phases are combined into the pixel magnitude and the pixel phase of the pixel.
摘要翻译： 在用于确定检查对象的磁共振（MR）图像的方法和磁共振系统中，其中由多个线圈获取的多个线圈特定MR数据集用于MR图像。 MR图像的每个像素由不同线圈（6-10）的至少两个线圈专用MR数据集确定，并且每个像素具有像素幅度和像素相位。 确定分别与多个线圈之一相关联的多个线圈特定基相。 对于每个像素，多个线圈特定像素，确定幅度和多个像素相位。 线圈特定像素幅度和线圈特定像素相位分别由多个线圈（7-10）之一的线圈专用MR数据组确定。 具有对应的线圈特定基极相位的线圈特定像素相位和多个线圈特定像素幅度以及多个线圈特定像素相位被合并到像素的像素大小和像素相位中。
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7.发明申请Method for determining an attenuation map for use in positron emission tomography and for the use of homogeneity information relating to the magnetic resonance magnetic field 有权用于确定正电子发射断层扫描中使用的衰减图的方法和使用与磁共振磁场相关的均匀性信息的方法公开(公告)号：US20100052674A1
公开(公告)日：2010-03-04
申请号：US12461902
申请日：2009-08-27
IPC分类号： G01R33/48
CPC分类号： G01R33/56563 , A61B6/037 , A61B6/5247 , G01R33/481 , G01R33/4828 , G01R33/543
摘要： A method is disclosed for determining an attenuation map for use in positron emission tomography and for the use of homogeneity information relating to the magnetic resonance magnetic field, in particular for the purpose of determining shim settings, within the scope of a single magnetic resonance image recording. In at least one embodiment of the method, a first and a second image data record are firstly recorded with a three-dimensional gradient echo sequence during a first and a second echo time, respectively, with the phase difference between the water and the fat signal amounting to zero during the first echo time and amounting to 180 degrees during the second echo time. The attenuation map is determined from fat/water ratios obtained from the image data records by way of a Dixon technology, in particular a 2-point Dixon technology. In at least one embodiment, all voxels with a signal intensity below a first threshold value are excluded at least for the second image data record by using a mask and only the non excluded voxels of the first and second image data record are taken into consideration in order to determine the homogeneity information from the phase differences of adjacent voxels.
摘要翻译： 公开了一种用于确定在正电子发射断层摄影中使用的衰减图和使用与磁共振磁场有关的均匀性信息的方法，特别是用于在单个磁共振图像记录的范围内确定垫片设置的目的 。 在该方法的至少一个实施例中，第一和第二图像数据记录首先在第一和第二回波时间期间被记录有三维梯度回波序列，水和脂肪信号之间的相位差 在第一回波时间期间为零，并且在第二回波时间期间达到180度。 通过Dixon技术，特别是2点Dixon技术，从图像数据记录获得的脂肪/水比确定衰减图。 在至少一个实施例中，至少对于第二图像数据记录通过使用掩码来排除具有低于第一阈值的信号强度的所有体素，并且仅考虑第一和第二图像数据记录的未排除的体素 从相邻体素的相位差来确定均匀性信息。
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8.发明授权Method for determining an attenuation map for use with positron emission tomography and magnetic resonance magnetic field homogeneity from a single three dimensional gradient echo sequence 有权用于从单个三维梯度回波序列确定用于正电子发射断层扫描和磁共振磁场均匀性的衰减图的方法公开(公告)号：US08547094B2
公开(公告)日：2013-10-01
申请号：US12461902
申请日：2009-08-27
IPC分类号： G01R33/48
CPC分类号： G01R33/56563 , A61B6/037 , A61B6/5247 , G01R33/481 , G01R33/4828 , G01R33/543
摘要： A method is disclosed for determining an attenuation map for use in positron emission tomography and for the use of homogeneity information relating to the magnetic resonance magnetic field, in particular for the purpose of determining shim settings, within the scope of a single magnetic resonance image recording. In at least one embodiment of the method, a first and a second image data record are firstly recorded with a three-dimensional gradient echo sequence during a first and a second echo time, respectively, with the phase difference between the water and the fat signal amounting to zero during the first echo time and amounting to 180 degrees during the second echo time. The attenuation map is determined from fat/water ratios obtained from the image data records by way of a Dixon technology, in particular a 2-point Dixon technology. In at least one embodiment, all voxels with a signal intensity below a first threshold value are excluded at least for the second image data record by using a mask and only the non excluded voxels of the first and second image data record are taken into consideration in order to determine the homogeneity information from the phase differences of adjacent voxels.
摘要翻译： 公开了一种用于确定在正电子发射断层摄影中使用的衰减图和使用与磁共振磁场相关的均匀性信息的方法，特别是用于在单个磁共振图像记录的范围内确定垫片设置的目的 。 在该方法的至少一个实施例中，第一和第二图像数据记录首先在第一和第二回波时间期间被记录有三维梯度回波序列，水和脂肪信号之间的相位差 在第一回波时间期间为零，并且在第二回波时间期间达到180度。 通过Dixon技术，特别是2点Dixon技术，从图像数据记录获得的脂肪/水比确定衰减图。 在至少一个实施例中，至少对于第二图像数据记录通过使用掩码来排除具有低于第一阈值的信号强度的所有体素，并且仅考虑第一和第二图像数据记录的未排除的体素 从相邻体素的相位差来确定均匀性信息。
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公开(公告)号：US20100201364A1
公开(公告)日：2010-08-12
申请号：US12763480
申请日：2010-04-20
申请人： Vladimir Jellus
发明人： Vladimir Jellus
IPC分类号： G01R33/48
CPC分类号： G01R33/565 , G01R33/4828 , G01R33/56563 , G01R33/5659
摘要： A method corrects for a phase error in an MR image, in which MR signals of an examination subject are acquired, complex images of the examination subject are generated, phase differences of the phase values for various image points of the complex images are established with an averaged phase value of image points from a first surrounding region of a respective image point, and a phase correction is executed dependent on how well the phase differences correspond to a predetermined phase value, where the order of the image points in which the phase correction is implemented is dependent on how well the phase values in the image points correspond to the predetermined phase value.
摘要翻译： 一种校正MR图像中的相位误差的方法，其中检测对象的MR信号被获取，生成检查对象的复杂图像，复合图像的各个图像点的相位值的相位差用 来自相应图像点的第一周围区域的图像点的平均相位值，并且相位校正根据相位差对应于预定相位值的程度而执行，其中相位校正为 实现取决于图像点中的相位值对应于预定相位值的程度。
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10.发明授权Method for correcting inhomogeneities in an image, and an imaging apparatus therefor 有权用于校正图像中的不均匀性的方法及其成像装置公开(公告)号：US07672498B2
公开(公告)日：2010-03-02
申请号：US11311364
申请日：2005-12-20
申请人： Vladimir Jellus
发明人： Vladimir Jellus
CPC分类号： G01R33/565 , G01R33/5608 , G01R33/5659
摘要： A method is for correcting inhomogeneities in an image that is recorded from an examination object. The method includes recording an image to be corrected, calculating a correction image from the image to be corrected and correcting the recorded image with the aid of the correction image in order to produce a normalized image by multiplying the correction image by the image to be corrected. When calculating the correction images, the pixels in the vicinity of the imaged examination object are identified with the aid of a signal intensity that is lower than a limiting value. Further, these pixels are allocated signal intensities that in each case are a function of the signal intensity of the pixels in the respective neighborhood.
摘要翻译： 一种用于校正从检查对象记录的图像中的不均匀性的方法。 该方法包括记录要校正的图像，从待校正的图像计算校正图像，借助于校正图像校正记录图像，以便通过将校正图像乘以待校正图像来产生归一化图像 。 当计算校正图像时，借助于低于限制值的信号强度来识别被成像的检查对象附近的像素。 此外，这些像素被分配信号强度，其在每种情况下都是相应邻域中的像素的信号强度的函数。
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