公开(公告)号：US20070013374A1

公开(公告)日：2007-01-18

申请号：US11408552

申请日：2006-04-21

申请人： Mark Griswold ,  Stephan Kannengiesser

发明人： Mark Griswold ,  Stephan Kannengiesser

IPC分类号： G01V3/00 ,  A61B5/05

CPC分类号： G01R33/5611 ,  G01R33/5612 ,  G01R33/583

摘要： In a method for determining transmission coil-specific RF excitation pulses for component coils of a transmission coil array for accelerated, PPA-based volume-selective magnetic resonance excitation of a tissue region of a patient, and a magnetic resonance tomography apparatus operating according to the method, a first series of volume-selective RF excitation pulses along a first transmission trajectory in transmission κ-space is successively individually radiated by the component coils of the transmission coil array and the resulting magnetic resonance signals are received, and a second series of volume-selected RF excitation pulses along a further reduced transmission trajectory in transmission κ-space is simultaneously radiated by all component coils of the transmission coil array and the resulting magnetic resonance signals are received, and a complete transmission trajectory in transmission K-space is then determined from which combination coefficients are calculated, and the coil specific RF excitation pulses are then calculated from the combination coefficients in order to produce a desired excitation profile.

摘要翻译： 在用于确定用于加速的基于PPA的体积选择性磁共振激励患者的组织区域的传输线圈阵列的分量线圈的传输线圈特定RF激励脉冲的方法中，以及根据该方法操作的磁共振断层摄影装置 方法中，沿传输线圈阵列中的第一传输轨迹的第一系列体积选择性RF激励脉冲被传输线圈阵列的分量线圈连续单独辐射，并且接收所得到的磁共振信号，并且接收第二系列体积 通过传输线圈阵列的所有分量线圈同时辐射沿着传输卡巴空间中进一步减小的传输轨迹的选择的RF激励脉冲，并且接收所得到的磁共振信号，然后确定传输K空间中的完整传输轨迹 从中计算组合系数， 然后从组合系数计算线圈特定的RF激励脉冲，以便产生期望的激励分布。

公开(公告)号：US07558614B2

公开(公告)日：2009-07-07

申请号：US11408552

申请日：2006-04-21

申请人： Mark Griswold ,  Stephan Kannengiesser

发明人： Mark Griswold ,  Stephan Kannengiesser

IPC分类号： A61B5/05 ,  G01V3/00

CPC分类号： G01R33/5611 ,  G01R33/5612 ,  G01R33/583

摘要： In a method for determining transmission coil-specific RF excitation pulses for component coils of a transmission coil array for accelerated, PPA-based volume-selective magnetic resonance excitation of a tissue region of a patient, and a magnetic resonance tomography apparatus operating according to the method, a first series of volume-selective RF excitation pulses along a first transmission trajectory in transmission κ-space is successively individually radiated by the component coils of the transmission coil array and the resulting magnetic resonance signals are received, and a second series of volume-selected RF excitation pulses along a further reduced transmission trajectory in transmission κ-space is simultaneously radiated by all component coils of the transmission coil array and the resulting magnetic resonance signals are received, and a complete transmission trajectory in transmission κ-space is then determined from which combination coefficients are calculated, and the coil specific RF excitation pulses are then calculated from the combination coefficients in order to produce a desired excitation profile.

摘要翻译： 在用于确定用于加速的基于PPA的体积选择性磁共振激励患者的组织区域的传输线圈阵列的分量线圈的传输线圈特定RF激励脉冲的方法中，以及根据该方法操作的磁共振断层摄影装置 方法中，沿传输线圈阵列中的第一传输轨迹的第一系列体积选择性RF激励脉冲被传输线圈阵列的分量线圈连续单独辐射，并且接收所得到的磁共振信号，并且接收第二系列体积 通过传输线圈阵列的所有分量线圈同时辐射沿着传输卡巴空间中进一步减小的传输轨迹的选择的RF激励脉冲，并且接收所得到的磁共振信号，然后确定传输卡巴空间中的完整传输轨迹 从中计算组合系数， 然后从组合系数计算线圈特定的RF激励脉冲，以便产生期望的激励曲线。

公开(公告)号：US07495437B2

公开(公告)日：2009-02-24

申请号：US11409373

申请日：2006-04-21

申请人： Mark Griswold ,  Vladimir Jellus ,  Stephan Kannengiesser

发明人： Mark Griswold ,  Vladimir Jellus ,  Stephan Kannengiesser

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。

公开(公告)号：US20060284812A1

公开(公告)日：2006-12-21

申请号：US11409373

申请日：2006-04-21

申请人： Mark Griswold ,  Vladimir Jellus ,  Stephan Kannengiesser

发明人： Mark Griswold ,  Vladimir Jellus ,  Stephan Kannengiesser

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。

公开(公告)号：US09194925B2

公开(公告)日：2015-11-24

申请号：US14054903

申请日：2013-10-16

申请人： Xiaodong Zhong ,  Marcel Dominik Nickel ,  Stephan Kannengiesser

发明人： Xiaodong Zhong ,  Marcel Dominik Nickel ,  Stephan Kannengiesser

IPC分类号： G01R33/50 ,  G01R33/48

CPC分类号： G01R33/4828 ,  G01R33/50

摘要： A computer-implemented method for quantifying fat and iron in anatomical tissue includes acquiring a plurality of multi-echo signal datasets representative of the anatomical tissue using a magnetic resonance (MR) pulse sequence. A plurality of multi-echo signal datasets are selected from the plurality of multi-echo signal datasets and used to determine a first water magnitude value and a first fat magnitude value. In response to determining that the multi-echo signal datasets include at least three multi-echo datasets, a first stage analysis is performed. This first stage analysis comprises selecting a first effective transverse relaxation rate value. Next, first algorithm inputs comprising the first water magnitude value, the first fat magnitude value, and the first effective transverse relation rate value are created. Then, a non-linear fitting algorithm is performed based on the first algorithm inputs to calculate a second water magnitude value, a second fat magnitude value, and a second effective transverse relaxation rate value. A first proton density fat fraction value is then determined based on the second water magnitude value and the second fat magnitude value.

摘要翻译： 用于在解剖组织中量化脂肪和铁的计算机实现的方法包括使用磁共振（MR）脉冲序列获取代表解剖组织的多个多回波信号数据集。 从多个多回波信号数据集中选择多个多回波信号数据集，并用于确定第一水量值和第一脂肪量值。 响应于确定多回波信号数据集包括至少三个多回波数据集，执行第一阶段分析。 该第一阶段分析包括选择第一有效横向松弛率值。 接下来，创建包括第一水量值，第一脂肪量值和第一有效横向关系速率值的第一算法输入。 然后，基于第一算法输入来执行非线性拟合算法，以计算第二水量值，第二脂肪量值和第二有效横向松弛率值。 然后基于第二水量值和第二脂肪量值来确定第一质子密度脂肪分数值。

公开(公告)号：US20140161336A1

公开(公告)日：2014-06-12

申请号：US14088386

申请日：2013-11-23

申请人： Stephan Biber ,  Stephan Kannengiesser

发明人： Stephan Biber ,  Stephan Kannengiesser

IPC分类号： G06T11/00 ,  G06T7/00

CPC分类号： G01R33/5608 ,  G01R33/3415 ,  G01R33/5611

摘要： An apparatus and a method for generating an image from N reception signal data sets of signals received by a plurality of coils of a magnetic resonance tomography appliance from a region of a body to be examined using an image processing computer are provided. The apparatus includes a degree-of-compression determining device. A ratio N/M of the number N of N reception signal data sets generated from the signals received by the plurality of coils to a smaller number M of mode data sets is defined taking account of a plurality of parameters. The plurality of parameters at least also represent system resources of the image processing computer. Using a compression computer, the N reception signal data sets are compressed into M mode data sets. After this, the M mode data sets are used by the image processing computer for generating the image of the region of the body.

摘要翻译： 提供了一种用于从使用图像处理计算机的被检体的区域从磁共振断层摄影装置的多个线圈接收的N个接收信号数据组生成图像的装置和方法。 该装置包括压缩度确定装置。 通过考虑多个参数来定义从多个线圈接收到的信号产生的N个接收信号数据集合的数目N的比N / M到模式数据集的较小数量M. 多个参数至少也表示图像处理计算机的系统资源。 使用压缩计算机，N个接收信号数据集被压缩成M个模式数据集。 之后，M模式数据集由图像处理计算机用于生成身体区域的图像。

公开(公告)号：US08598873B2

公开(公告)日：2013-12-03

申请号：US12700191

申请日：2010-02-04

申请人： Stephan Kannengiesser ,  Peter Schmitt ,  Michael Zenge

发明人： Stephan Kannengiesser ,  Peter Schmitt ,  Michael Zenge

IPC分类号： A61B5/055 ,  G01R33/563 ,  G01R33/561

CPC分类号： G01R33/56375 ,  A61B5/0555 ,  G01R33/5619 ,  G01R33/56308 ,  G01R33/56383

摘要： In a method and apparatus for time-resolved acquisition of magnetic resonance (MR) data, an examination subject is continuously moved through the examination region of an MR scanner, and MR signals are acquired. Prior to the acquisition of MR signals, a phase coding that corresponds to a position for data entry in k-space is carried out. An interruption of the movement of the subject takes place at a predetermined table position, and the acquisition of MR signals is continued over the course of a predetermined time period, while the subject is at rest in the predetermined position. At least while the subject is at rest, the phase coding causes acquisition of a predetermined number of MR signals for filling a first region of k-space to alternate with MR data and a predetermined number of MR signals for filling a second region of k-space.

摘要翻译： 在用于时间分辨获取磁共振（MR）数据的方法和装置中，检查对象连续移动通过MR扫描器的检查区域，并且获取MR信号。 在获取MR信号之前，执行对应于k空间中的数据输入位置的相位编码。 被检体的动作的中断发生在规定的工作台位置，并且在预定时间段内持续进行MR信号的采集，同时被检体在预定位置处于静止状态。 至少在被摄体处于静止状态时，相位编码使得获得预定数量的MR信号用于填充k空间的第一区域以与MR数据交替并且预定数量的MR信号用于填充k-空间的第二区域， 空间。

公开(公告)号：US08362771B2

公开(公告)日：2013-01-29

申请号：US12687958

申请日：2010-01-15

申请人： Melanie Dornhaus ,  Stephan Kannengiesser

发明人： Melanie Dornhaus ,  Stephan Kannengiesser

IPC分类号： G01V3/00

CPC分类号： G01R33/3875 ,  G01R33/243 ,  G01R33/4835 ,  G01R33/5617 ,  G01R33/56375 ,  G01R33/56383

摘要： A fast, efficient, qualitatively high-grade shim is enabled in a magnetic resonance apparatus having a displaceable patient bed and an examination region of the patient that is to be examined is larger than an imaging region of the magnetic resonance apparatus. Field inhomogeneities are measured while the examination region is moved through the imaging region by a continuous displacement of the patient bed with the patient positioned thereon. Information representing field inhomogeneities is acquired at multiple positions of the patient bed from respective magnetic resonance signals received at these positions, by excitation of multiple respective slices before the readout of the echo of the first of these slices, with one echo train composed of multiple echoes being generated per excitation signal. Shim parameters of the magnetic resonance apparatus are adjusted dependent on the measured information.

摘要翻译： 在具有可位移的患者床的磁共振装置中能够实现快速，高效，定性高档的垫片，并且待检查的患者的检查区域大于磁共振装置的成像区域。 当检测区域通过患者定位在其上的患者床的连续移位而移动通过成像区域时，测量场不均匀性。 通过在读出这些切片中的第一个的回波之前激励多个相应的切片，在由多个回波组成的一个回波串的情况下，通过在多个相应切片的激发，从患者床的多个位置获取表示场不均匀性的信息， 每个激励信号产生。 根据测量信息调整磁共振设备的Shim参数。

公开(公告)号：US20050251023A1

公开(公告)日：2005-11-10

申请号：US11119478

申请日：2005-04-29

申请人： Stephan Kannengiesser ,  Thomas Mertelmeier ,  Arnulf Oppelt

发明人： Stephan Kannengiesser ,  Thomas Mertelmeier ,  Arnulf Oppelt

IPC分类号： A61B6/00 ,  G01N23/00 ,  G01R33/561 ,  G21K1/12

CPC分类号： G01R33/5611

摘要： In a method and for MR apparatus PPA imaging with radial data acquisition in magnetic resonance tomography, k-space is under-scanned by acquiring a number of projections φ with a coil array of M component coils, a shift operator C(±nΔk) is determined for a projection φi on the basis of measured magnetizations along a projection φi±α0 that encompasses with φi an angle α0, with n=1, 2, . . . , M−1, the shift operator C(±nΔk) is applied to individual points of projection φi in order to obtain calculated projection points, the determination and the application of the shift operator C(±nΔk) are repeated for all projections φ, and an image is reconstructed in the spatial domain on the basis of the projections, which have been completed purely computationally.

摘要翻译： 在磁共振断层成像中利用径向数据采集的方法和MR装置PPA成像中，通过用M个分量线圈的线圈阵列获取多个投影phi，使k空间被扫描，移位算子C（±nDeltak）为 基于沿着具有角度α0，其中n = 1,2，...包围的投影phi±α0的测量磁化来确定投影phii。 。 。 ，M-1，将移位算子C（±nDeltak）应用于投影phii的各个点，以获得计算的投影点，对于所有投影phi重复移位算子C（±nDeltak）的确定和应用， 并且基于已经完全在计算上完成的投影，在空间域中重建图像。

公开(公告)号：US09297873B2

公开(公告)日：2016-03-29

申请号：US13627042

申请日：2012-09-26

申请人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

发明人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

IPC分类号： G01R33/561

CPC分类号： G01R33/5611

摘要： In a method to select an undersampling scheme of k-space and an associated set of reconstruction kernels to acquire reduced magnetic resonance (MR) data sets with multiple coils, a calibration data set is acquired for each of the respective coils, a noise covariance is determined from autocorrelations and correlations of the noise of the various coils. At least one set of reconstruction kernels is calculated for each of the multiple undersampling schemes from the calibration data sets of the various coils. For each set of reconstruction kernels, a characteristic value is calculated from the noise covariance and the respective reconstruction kernels of the coils, with the characteristic value being proportional to a spatial mean value of a signal noise of an MR image. A selected undersampling scheme and a selected set of reconstruction kernels are selected based on the calculated characteristic values.

摘要翻译： 在选择k空间的欠采样方案和相关联的一组重建内核以获取具有多个线圈的减小的磁共振（MR）数据集的方法中，针对各个线圈获取校准数据集，噪声协方差为 根据各种线圈的噪声的自相关性和相关性确定。 根据各种线圈的校准数据集，对于多个欠采样方案中的每一个计算至少一组重构内核。 对于每组重建内核，根据噪声协方差和线圈的相应重建内核计算特征值，其特征值与MR图像的信号噪声的空间平均值成比例。 基于所计算的特征值来选择所选的欠采样方案和所选择的重构内核集合。