公开(公告)号：US20060058628A1

公开(公告)日：2006-03-16

申请号：US10536284

申请日：2003-11-20

申请人： Miha Fuderer

发明人： Miha Fuderer

IPC分类号： A61B5/05

CPC分类号： G01R33/5611

摘要： A novel magnetic resonance imaging method is presented for forming an image of an object from a plurality of signals acquired by an array of receiver antennae, whereas prior to imaging a sensitivity map of each of the receiver antennae is provided, at least two adjacent antennae record signals originating from the same imaging position and the image intensity is calculated from the signals measured by different antennae, wherein the number of phase encoding steps is reduced with respect to the full set thereof. Further the homogeneity of the main magnetic field is defined in a first region of full homogeneity, a second region of moderate homogeneity and a third region of full inhomogeneity, the sensitivity data of the array of receiver antennae is measured by a coarse calibration scan, whereas the full measured sensitivity data is used in the first region, for each point in the second region an estimate of the coil sensitivities is derived by a weighted addition of the measured sensitivities in the neighborhood of that point, and in the third region the sensitivity data is set zero.

摘要翻译： 提出了一种新颖的磁共振成像方法，用于从由接收器天线阵列获取的多个信号中形成物体的图像，而在成像之前，提供每个接收器天线的灵敏度图，至少两个相邻的天线记录 根据由不同天线测量的信号计算源自相同成像位置的信号和图像强度，其中相对于其全部集合减少相位编码步骤的数量。 此外，主磁场的均匀性在完全均匀的第一区域，中等均匀性的第二区域和完全不均匀的第三区域中定义，接收器天线阵列的灵敏度数据通过粗略的校准扫描来测量，而 在第一区域中使用完全测量的灵敏度数据，对于第二区域中的每个点，通过在该点附近加权测量的灵敏度来推导线圈灵敏度的估计，并且在第三区域中灵敏度数据 设置为零。

公开(公告)号：US09390521B2

公开(公告)日：2016-07-12

申请号：US13996031

申请日：2011-12-19

申请人： Wei Lin ,  Feng Huang ,  Miha Fuderer

发明人： Wei Lin ,  Feng Huang ,  Miha Fuderer

IPC分类号： G06K9/00 ,  G06T11/00 ,  G01R33/561 ,  G01R33/48

CPC分类号： G06T11/005 ,  G01R33/4824 ,  G01R33/5611

摘要： An imaging method comprises acquiring an undersampled magnetic resonance partially parallel imaging (MR-PPI) dataset using a plurality of radio frequency receive coils and reconstructing the undersampled MR-PPI dataset to generate a reconstructed magnetic resonance (MR) image. The reconstructing includes: (i) using a generalized auto-calibrating partially parallel acquisition (GRAPPA) operator or direct convolution to fill in at least some missing data of the undersampled MR-PPI dataset so as to generate an enhanced dataset; and (ii) using an algorithm other than a GRAPPA operator and other than direct convolution to reconstruct the enhanced dataset or to reconstruct the undersampled MR-PPI dataset using the enhanced dataset as an initialization dataset for an iterative reconstruction algorithm. In some embodiments the MR-PPI dataset is a non-Cartesian dataset and a GRAPPA operator for wider radial bands (GROWL) is used in the operation (i).

摘要翻译： 一种成像方法包括使用多个射频接收线圈获取欠采样的磁共振部分并行成像（MR-PPI）数据集，并重建欠采样MR-PPI数据集以产生重建磁共振（MR）图像。 重构包括：（i）使用广义自动校准部分并行获取（GRAPPA）算子或直接卷积来填补欠采样的MR-PPI数据集的至少一些丢失数据，以生成增强数据集; 和（ii）使用除了GRAPPA算子之外的算法，而不是使用直接卷积来重建增强数据集，或者使用增强型数据集作为迭代重建算法的初始化数据集来重建欠采样的MR-PPI数据集。 在一些实施例中，MR-PPI数据集是非笛卡尔数据集，并且在操作（i）中使用用于较宽辐射带的GRAPPA算子（GROWL）。

公开(公告)号：US08938281B2

公开(公告)日：2015-01-20

申请号：US13496085

申请日：2010-09-27

申请人： Miha Fuderer ,  Thomas Hendrik Rozijn ,  Ulrich Katscher ,  Kay Nehrke ,  Paul Royston Harvey

发明人： Miha Fuderer ,  Thomas Hendrik Rozijn ,  Ulrich Katscher ,  Kay Nehrke ,  Paul Royston Harvey

IPC分类号： A61B5/05 ,  G01R33/561 ,  G01R33/565

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/5659

摘要： The invention relates to a magnetic resonance imaging apparatus including an array of two or more RF antennas for transmitting RF pulses to and receiving MR signals from a subject positioned in an examination volume, and where the RF antennas have spatial transmit and receive sensitivity profiles. The apparatus is configured to control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna. The apparatus is also configured to determine the phases and amplitudes from the spatial transmit sensitivity profiles of the RF antennas, and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas and from the spatial receive sensitivity profiles of the RF antennas. Further, the apparatus is configured to determine the spatial transmit sensitivity profiles of the RF antennas from the spatial receive sensitivity profiles of the RF antennas, or vice versa.

摘要翻译： 本发明涉及一种磁共振成像设备，包括两个或更多个RF天线的阵列，用于将RF脉冲发送到定位在检查体积中的被摄体并接收MR信号，并且其中RF天线具有空间发射和接收灵敏度分布。 该装置被配置为控制每个单独RF天线的RF馈送的时间连续性，相位和幅度。 该装置还被配置为根据RF天线的空间发射灵敏度分布来确定相位和振幅，并且从经由各个RF天线接收的接收的MR信号和从RF天线的空间接收灵敏度分布的组合重建MR图像 射频天线。 此外，该装置被配置为根据RF天线的空间接收灵敏度分布来确定RF天线的空间发射灵敏度分布，反之亦然。

公开(公告)号：US20120289814A1

公开(公告)日：2012-11-15

申请号：US13513918

申请日：2010-12-20

申请人： Miha Fuderer

发明人： Miha Fuderer

IPC分类号： A61B5/055

CPC分类号： G01R33/56358

摘要： A magnetic resonance elastography method includes application of mechanical oscillations with an oscillation period (T) to an object to be examined to generate mechanical waves in the object. A motion sensitive magnetic resonance acquisition sequence with repetition time TR issued to acquire magnetic resonance signals from the object. This acquisition sequence including application of one or more phase encoding steps within an individual repetition time. The repetition time times the number of phase encodings within one repetition time is not equal to an integer multiple of the oscillation period. Thus a magnetic resonance image of the wave pattern is reconstructed from the magnetic resonance signals assembled in a sample space spanned by the phase of the mechanical oscillation and the phase encoding.

摘要翻译： 磁共振弹性成像方法包括将振荡周期（T）施加到被检查物体上以在物体中产生机械波的机械振荡。 发出具有重复时间TR的运动敏感磁共振采集序列，以从物体采集磁共振信号。 该采集序列包括在单独的重复时间内应用一个或多个相位编码步骤。 重复时间乘以一个重复时间内的相位编码数不等于振荡周期的整数倍。 因此，从组装在由机械振荡和相位编码的相位所跨越的采样空间中的磁共振信号来重建波形图案的磁共振图像。

公开(公告)号：US07769425B2

公开(公告)日：2010-08-03

申请号：US11575527

申请日：2005-09-13

申请人： Paul Royston Harvey ,  Willem Marten Prins ,  Zhiyong Zhai ,  Miha Fuderer ,  Gerrit Hendrik Van Yperen

发明人： Paul Royston Harvey ,  Willem Marten Prins ,  Zhiyong Zhai ,  Miha Fuderer ,  Gerrit Hendrik Van Yperen

IPC分类号： A61B5/05

CPC分类号： G01R33/543 ,  G01R33/34046 ,  G01R33/5612 ,  G01R33/5659

摘要： A device performs MR imaging of a body (7) placed in a stationary and substantially homogeneous main magnetic field, with an RF transmit antenna (6) for radiating RF pulses towards the body (7), which RF transmit antenna (6) has different resonance modes. In order to improve image uniformity in high field MR imaging, the device (1) is arranged to determine the size and/or the aspect ratio of the body (7), and to acquire an MR image of the body (7) by an imaging sequence including RF pulses. The phases and amplitudes of the different resonance modes of the RF transmit antenna (6) excited during irradiation of the RF pulses are controlled on the basis of the size and/or aspect ratio of the body (7).

摘要翻译： 设备对放置在固定且基本均匀的主磁场中的主体（7）进行MR成像，其中RF射频天线（6）用于向身体（7）辐射RF脉冲，该RF发射天线（6）具有不同的 谐振模式。 为了提高高场MR成像中的图像均匀性，设备（1）被布置成确定身体（7）的尺寸和/或纵横比，并且通过一个 成像序列包括RF脉冲。 基于身体（7）的尺寸和/或纵横比来控制RF辐射照射期间激发的RF发射天线（6）的不同谐振模式的相位和振幅。

公开(公告)号：US20070276222A1

公开(公告)日：2007-11-29

申请号：US10599144

申请日：2005-03-21

申请人： Miha Fuderer ,  Franciscus Petrus Adrianus Donders

发明人： Miha Fuderer ,  Franciscus Petrus Adrianus Donders

IPC分类号： A61B5/055

CPC分类号： G01R33/34076 ,  G01R33/246

摘要： The invention relates to a system for magnetic resonance imaging (MRI). Such systems face an additional contribution to the inhomogeneity of the radio frequency (RF) field when high magnetic fields are applied. The invention tries to improve the homogeneity of the RF field for high field strengths, particularly for field strengths at or above 3 tesla. To improve the homogeneity an electrically conducting material (4) is positioned within the cavity (2) of the system. The material has a conductivity and a thickness which ensure that the total radial conductance in an xy-plane perpendicular to the symmetry axis of the cavity becomes isotropic.

摘要翻译： 本发明涉及一种用于磁共振成像（MRI）的系统。 当施加高磁场时，这样的系统对射频（RF）场的不均匀性有额外的贡献。 本发明试图提高高场强的RF场的均匀性，特别是对于3特斯拉以上的场强。 为了提高均匀性，导电材料（4）位于系统的空腔（2）内。 该材料具有导电性和厚度，其确保垂直于腔的对称轴的xy平面中的总径向电导变为各向同性。

公开(公告)号：US20050020897A1

公开(公告)日：2005-01-27

申请号：US10494927

申请日：2002-10-24

申请人： Miha Fuderer

发明人： Miha Fuderer

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/561 ,  G01R33/565 ,  A61B5/05

CPC分类号： G01R33/561 ,  G01R33/4824 ,  G01R33/5611 ,  G01R33/56545 ,  Y10T436/24

摘要： A novel magnetic resonance imaging method is described, wherein the object to be imaged is segmented into a region of slow variation and into a region of fast variation which defines a restrictive dynamic FOV. The object in the overall FOV is sampled in k-space with a reduction factor. The k-space sampling positions in the region of fast variation are transformed by Fourier Transformation to the spatial domain and are transformed additionally to the temporal-frequency domain. Further the positions in the temporal-frequency domain derived from the sub-sampled positions in k-space are unfolded on the basis of the spatial coil sensitivity profiles of the set of receiving coils, whereas the parts of the temporal-frequency domain related to the region of slow variation are set to zero, and the resulting data in the temporal-frequency domain is Fourier transformed to the temporal domain.

摘要翻译： 描述了一种新颖的磁共振成像方法，其中要成像的对象被分割成慢变化的区域并且被分割成限定动态FOV的快速变化区域。 整个FOV中的对象在k空间中以缩小因子进行采样。 通过傅里叶变换将快速变化区域中的k空间采样位置变换为空间域，并将其再次变换为时间 - 频域。 此外，基于k个空间中的子采样位置导出的时间 - 频域中的位置基于该组接收线圈的空间线圈灵敏度分布展开，而与时间 - 频域相关的部分与 缓慢变化的区域被设置为零，并且时间 - 频率域中的结果数据被傅里叶变换到时域。

公开(公告)号：US06745064B2

公开(公告)日：2004-06-01

申请号：US09940042

申请日：2001-08-27

申请人： Miha Fuderer ,  Paul Royston Harvey

发明人： Miha Fuderer ,  Paul Royston Harvey

IPC分类号： A61B5055

CPC分类号： G01R33/5611 ,  G01R33/4835

摘要： A magnetic resonance method is described for fast dynamic imaging from a plurality of signals acquired by an array of multiple sensors. The k-space will be segmented into regions of different acquisition. In the region of a first acquisition type a first partial image will be reconstructed by data of normal magnetic resonance imaging with a full set of phase encoding steps or by data of fast dynamic imaging with a number of phase encoding steps being with a low reduction factor with respect to the fall set thereof and in the region of a second acquisition type a second partial image will be reconstructed by data of fast dynamic imaging with a full reduction factor. Thereafter the first and the second partial images will be formed to the full image of the scanned object.

摘要翻译： 描述了由多个传感器阵列获取的多个信号的快速动态成像的磁共振方法。 k空间将被分割成不同采集区域。 在第一采集类型的区域中，通过具有全套相位编码步骤的正常磁共振成像的数据或通过具有低缩减因子的多个相位编码步骤的快速动态成像数据来重构第一部分图像 相对于其下降组合，并且在第二获取类型的区域中，将通过具有完全缩小因子的快速动态成像的数据来重建第二部分图像。 此后，第一和第二部分图像将被形成为扫描对象的完整图像。

公开(公告)号：US06518760B2

公开(公告)日：2003-02-11

申请号：US09918160

申请日：2001-07-30

申请人： Miha Fuderer ,  Johan Samuel Van Den Brink ,  Michel Paul Jurriaan Jurrissen ,  Arianne Margarethe Corinne Van Muiswinkel ,  Ulrich Katscher

发明人： Miha Fuderer ,  Johan Samuel Van Den Brink ,  Michel Paul Jurriaan Jurrissen ,  Arianne Margarethe Corinne Van Muiswinkel ,  Ulrich Katscher

IPC分类号： G01V300

CPC分类号： G01R33/5611 ,  G01R33/4835

摘要： A magnetic resonance imaging method employs sub-sampled signal acquisition from a number of receiver coils such as surface coils. A full field-of-view magnetic resonance image is reconstructed on the basis of the sensitivity profiles of the receiver coils, for example on the basis of the SENSE technique. The reconstruction is carried out mathematically as an optimization, for example, requiring a minimum noise level in the magnetic resonance image. According to the invention, a priori information is also involved in the reconstruction and the a priori information is taken into account especially as a constraint in optimization.

摘要翻译： 磁共振成像方法采用来自多个接收线圈（例如表面线圈）的子采样信号采集。 基于接收器线圈的灵敏度分布，例如基于SENSE技术，重建完整的视场磁共振图像。 重建在数学上进行为优化，例如要求磁共振图像中的最小噪声电平。 根据本发明，先验信息也涉及重建，并且先验信息被特别地考虑在优化中作为约束。

公开(公告)号：US5587656A

公开(公告)日：1996-12-24

申请号：US419491

申请日：1995-04-10

申请人： Teunis R. Van Heels-Bergen ,  Miha Fuderer

发明人： Teunis R. Van Heels-Bergen ,  Miha Fuderer

IPC分类号： G01R33/32 ,  A61B5/055 ,  G01N24/08 ,  G01R33/341 ,  G01R33/3415 ,  G01R33/56 ,  G06T5/00 ,  G01V3/00

CPC分类号： G01R33/3415

摘要： A method of determining a magnetic resonance (MR) distribution in a part of a body uses an arrangement of multiple surface coils. According to the method, component distributions are determined using separate ones of the surface coils and the component distributions are combined to form the MR distribution. This is done by first combining the component distributions to form a distribution I.sub.hom which is optimized with respect to homogeneity and a distribution I.sub.snr which is optimized with respect to signal-to-noise ratio (SNR). Then the distributions I.sub.hom and I.sub.snr are combined to form the MR distribution, preferably by determining a smoothed ratio of the distributions I.sub.hom and I.sub.snr and using that ratio to correct I.sub.snr for homogeneity. Also an apparatus to perform the method is disclosed.

摘要翻译： 确定身体的一部分中的磁共振（MR）分布的方法使用多个表面线圈的布置。 根据该方法，使用单独的表面线圈确定组件分布，并且组合分布被组合以形成MR分布。 这通过首先组合分量分布来形成相对于均匀性优化的分布Ihom和相对于信噪比（SNR）被优化的分布Isnr来完成。 然后将分布Ihom和Isnr组合以形成MR分布，优选地通过确定分布Ihom和Isnr的平滑比率并且使用该比率来校正Isnr以获得均匀性。 还公开了一种执行该方法的装置。