公开(公告)号：US20080238423A1

公开(公告)日：2008-10-02

申请号：US12056607

申请日：2008-03-27

申请人： Guo Bin Li ,  Yiu-Cho Chung ,  Qiang Zhang ,  Xiao Dong Zhou

发明人： Guo Bin Li ,  Yiu-Cho Chung ,  Qiang Zhang ,  Xiao Dong Zhou

IPC分类号： G01R33/483 ,  G01K13/00

CPC分类号： G01R33/4804 ,  G01K7/38 ,  G01K2213/00 ,  G01R33/4814

摘要： In a method and apparatus for accelerating MR temperature imaging used in MR-monitored high intensity focused ultrasound (HIFU) therapy, temperature changes are determined at the focus of the ultrasound during MR temperature imaging; determining the ideal acceleration rate needed for data sampling according to the temperature changes at said focus is determined, the variable-density (VD) data sampling in k-space is adjusted according to the determined ideal acceleration rate, and the data obtained from sampling are reconstructed to form an image. The capability of accelerating MR temperature imaging with both good temporal resolution and good spatial resolution is improved by determining the acceleration rate according to temperature changes at the ultrasound focus and by adjusting the VD data sampling of k-space and thereby the benefits of good flexibility, feasibility and stability are achieved.

摘要翻译： 在用于MR监测的高强度聚焦超声（HIFU）治疗中用于加速MR温度成像的方法和装置中，在MR温度成像期间在超声的焦点处确定温度变化; 确定根据所述焦点处的温度变化进行数据采样所需的理想加速度，根据确定的理想加速度调整k空间中的可变密度（VD）数据采样，并且从采样得到的数据为 重建形成图像。 通过根据超声聚焦温度变化确定加速度，并通过调整k-空间的VD数据采样，从而提高良好的灵活性的好处，提高了具有良好的时间分辨率和良好的空间分辨率的MR温度成像加速能力， 实现可行性和稳定性。

公开(公告)号：US07521930B2

公开(公告)日：2009-04-21

申请号：US12056607

申请日：2008-03-27

申请人： Guo Bin Li ,  Yiu-Cho Chung ,  Qiang Zhang ,  Xiao Dong Zhou

发明人： Guo Bin Li ,  Yiu-Cho Chung ,  Qiang Zhang ,  Xiao Dong Zhou

IPC分类号： G01V3/00

CPC分类号： G01R33/4804 ,  G01K7/38 ,  G01K2213/00 ,  G01R33/4814

摘要： In a method and apparatus for accelerating MR temperature imaging used in MR-monitored high intensity focused ultrasound (HIFU) therapy, temperature changes are determined at the focus of the ultrasound during MR temperature imaging; determining the ideal acceleration rate needed for data sampling according to the temperature changes at said focus is determined, the variable-density (VD) data sampling in k-space is adjusted according to the determined ideal acceleration rate, and the data obtained from sampling are reconstructed to form an image. The capability of accelerating MR temperature imaging with both good temporal resolution and good spatial resolution is improved by determining the acceleration rate according to temperature changes at the ultrasound focus and by adjusting the VD data sampling of k-space and thereby the benefits of good flexibility, feasibility and stability are achieved.

摘要翻译： 在用于MR监测的高强度聚焦超声（HIFU）治疗中用于加速MR温度成像的方法和装置中，在MR温度成像期间在超声的焦点处确定温度变化; 确定根据所述焦点处的温度变化进行数据采样所需的理想加速度，根据确定的理想加速度调整k空间中的可变密度（VD）数据采样，并且从采样得到的数据为 重建形成图像。 通过根据超声聚焦温度变化确定加速度，并通过调整k-空间的VD数据采样，从而提高良好的灵活性的好处，提高了具有良好的时间分辨率和良好的空间分辨率的MR温度成像加速能力， 实现可行性和稳定性。

公开(公告)号：US07868615B2

公开(公告)日：2011-01-11

申请号：US12344958

申请日：2008-12-29

申请人： Guo Bin Li ,  Wei Jun Zhang

发明人： Guo Bin Li ,  Wei Jun Zhang

IPC分类号： G01V3/00

CPC分类号： G01R33/56509

摘要： In a method and device for suppressing residual motion artifacts, k-space is divided into a snapshot segment, an alternate sampling segment and a high frequency segment in a phase encoding direction; then phase encoding lines are respectively sampled within each of the segments; and a magnetic resonance image is reconstructed according to the phase encoding lines within k-space.

摘要翻译： 在用于抑制残余运动伪影的方法和装置中，在相位编码方向上将k空间划分为快照段，替代采样段和高频段; 然后在每个段内分别采样相位编码线; 并且根据k空间内的相位编码线重构磁共振图像。

公开(公告)号：US20130099785A1

公开(公告)日：2013-04-25

申请号：US13660133

申请日：2012-10-25

申请人： Guo Bin Li ,  Dominik Paul

发明人： Guo Bin Li ,  Dominik Paul

IPC分类号： G01R33/54 ,  G01R33/34

CPC分类号： G01R33/4833 ,  G01R33/5617 ,  G01R33/56509

摘要： Acquisition of magnetic resonance (MR) data in a predetermined three-dimensional volume segment of an examination subject with an MR apparatus proceeds by the volume segment being excited with an RF excitation pulse, and repeated, temporally sequential implementation of the following in order to respectively read out an echo train: Switch a refocusing pulse. Switch a first phase coding gradient in a first direction and a second phase coding gradient in a second direction. Switch an additional magnetic field gradient for spatial coding in a third direction which is perpendicular to the first direction and the second direction, wherein the MR data of a k-space line are read out while the additional magnetic field gradient is switched. Every k-space line corresponds to a line of k-space that corresponds to the volume segment. At least one k-space line is read out repeatedly in a middle segment of k-space.

摘要翻译： 利用MR装置在检查对象的预定三维体积段中获取磁共振（MR）数据，由RF激励脉冲进行激励，并且分别重复，时间顺序地执行以下操作： 读出回波列：切换重聚焦脉冲。 在第一方向和第二方向上切换第二相位编码梯度的第一相位编码梯度。 在垂直于第一方向和第二方向的第三方向上切换用于空间编码的附加磁场梯度，其中在切换附加磁场梯度时读出k空间线的MR数据。 每个k空间线对应于对应于音量段的k空间线。 在k空间的中间段中重复读出至少一个k空间线。

公开(公告)号：US20110043203A1

公开(公告)日：2011-02-24

申请号：US12842121

申请日：2010-07-23

申请人： Cai Xia Fu ,  Guo Bin Li

发明人： Cai Xia Fu ,  Guo Bin Li

IPC分类号： G01R33/44

CPC分类号： G01R33/485 ,  G01R33/56518

摘要： In a method and device for side-band suppression, a positive eddy current correction factor and negative eddy current correction factor are determined and scanning N/2 times by a positive gradient takes place, and the positive gradient scanning signal is collected during each scan. Scanning N/2 times by a negative gradient also takes place, and the negative gradient scanning signal is collected during each scan. N is an even number. An eddy current correction of the N/2 positive gradient scanning signals collected according to the positive eddy current correction factor is performed as an eddy current correction of the N/2 negative gradient scanning signals collected according to the negative eddy current correction factor. The side-band suppressed spectrum signal according to the N/2 positive gradient scanning signals that have undergone the eddy current correction is calculated, as is the N/2 negative gradient scanning signals that have undergone the eddy current correction. The method and device according to the present invention can effectively suppress the side band.

摘要翻译： 在用于边带抑制的方法和装置中，确定正涡流校正因子和负涡流校正因子，并且通过正梯度扫描N / 2次，并且在每次扫描期间收集正梯度扫描信号。 通过负梯度扫描N / 2次，并且在每次扫描期间收集负梯度扫描信号。 N是偶数。 根据正涡流校正因子收集的N / 2正梯度扫描信号的涡流校正被执行为根据负涡流校正因子收集的N / 2负梯度扫描信号的涡流校正。 根据已进行涡流校正的N / 2正梯度扫描信号计算侧带抑制频谱信号，以及已进行涡流校正的N / 2个负梯度扫描信号。 根据本发明的方法和装置可以有效地抑制边带。

公开(公告)号：US20090169083A1

公开(公告)日：2009-07-02

申请号：US12344900

申请日：2008-12-29

申请人： Guo Bin Li

发明人： Guo Bin Li

IPC分类号： G06K9/00

CPC分类号： G01R33/56509 ,  G01R33/4824 ,  G01R33/5617 ,  G01R33/56563

摘要： In a method and device for correcting distortion in MRI, k-space data are acquired in a number of data readout directions, the data are converted into a number of images, and a corresponding pixel shift map is generated for each image. The geometric distortion in the corresponding image is corrected according to the pixel shift map, and then all geometric distortion-corrected images are combined. Since movement distortion normally exists in the data readout direction, collecting the k-space data from a number of data readout directions can effectively correct movement distortion. Moreover, correcting the geometric distortion for the images converted from data acquired in a number of data readout directions according to the pixel shift map can reduce the geometric distortion of the final image generated from combination of images. The method and device correct not only movement distortion of MRI images, but also geometric distortion of MRI images.

摘要翻译： 在用于校正MRI中的失真的方法和装置中，在多个数据读出方向上获取k空间数据，将数据转换为多个图像，并且为每个图像生成相应的像素移位图。 根据像素移位图校正相应图像中的几何失真，然后组合所有几何失真校正图像。 由于在数据读出方向上通常存在运动失真，因此从多个数据读出方向收集k空间数据可以有效地校正运动失真。 此外，根据像素移位图，对从数据读出方向获取的数据转换的图像的几何失真进行校正可以减少由图像组合产生的最终图像的几何失真。 该方法和装置不仅校正MRI图像的运动失真，而且校正MRI图像的几何失真。

公开(公告)号：US08625871B2

公开(公告)日：2014-01-07

申请号：US13422034

申请日：2012-03-16

申请人： Robert Grimm ,  Guo Bin Li ,  Dominik Paul

发明人： Robert Grimm ,  Guo Bin Li ,  Dominik Paul

IPC分类号： G06K9/00

CPC分类号： G01R33/565 ,  G01R33/5608

摘要： In an embodiment, a method is disclosed which includes: carrying out interpolation by using a slice away from a slab boundary, and substituting a slice having slab boundary artifacts existing in the slab boundary, to obtain an interpolated image; carrying out Fourier transform on the interpolated image to generate first K-space data; carrying out Fourier transform on the original image to generate second K-space data; merging the first K-space data with the second K-space data, wherein the weight of the first K-space data is greater than that of the second K-space data in the middle of the K-space, and the weight of the second K-space data is greater than that of the first K-space data at the edge of the K-space; and carrying out inverse Fourier transform on the merged K-space data.

摘要翻译： 在一个实施例中，公开了一种方法，其包括：通过使用离开平板边界的切片进行插值，并且替换存在于平板边界中的具有平板边界伪影的切片以获得内插图像; 对内插图像进行傅里叶变换，生成第一K空间数据; 对原始图像进行傅里叶变换，生成第二K空间数据; 将第一K空间数据与第二K空间数据合并，其中第一K空间数据的权重大于K空间中间的第二K空间数据的权重，并且 第二K空间数据大于K空间边缘的第一K空间数据的数据; 对合并后的K空间数据进行傅里叶逆变换。

公开(公告)号：US08604788B2

公开(公告)日：2013-12-10

申请号：US13097289

申请日：2011-04-29

申请人： Guo Bin Li ,  Dominik Paul

发明人： Guo Bin Li ,  Dominik Paul

IPC分类号： G01V3/00

CPC分类号： G01R33/5617 ,  G01R33/4822 ,  G01R33/4833

摘要： A three-dimensional turbo spin echo imaging method of applying, within a repetition time TR, N groups of pulses to respectively scan N slabs in succession, with each group including one excitation pulse and more than one refocusing pulse, wherein N is a positive integer greater than 1, is improved by applying a first slice selection gradient at the same time as applying each said excitation pulse, and applying a second slice selection gradient at the same time as applying each said refocusing pulse, and applying a phase encoding gradient after having applied each refocusing pulse, then applying a frequency encoding gradient and acquiring scan signals during the duration of the frequency encoding gradient. An image according to the scan signals is reconstructed.

摘要翻译： 一种三维涡旋自旋回波成像方法，在重复时间TR内施加N组脉冲以分别扫描N个平板，每组包括一个激励脉冲和多于一个重聚焦脉冲，其中N是正整数 大于1，通过在应用每个所述激励脉冲的同时施加第一切片选择梯度并在施加每个所述重聚焦脉冲的同时施加第二切片选择梯度并在具有第一切片选择梯度之后施加相位编码梯度 应用每个重聚焦脉冲，然后施加频率编码梯度并在频率编码梯度的持续时间期间获取扫描信号。 重建根据扫描信号的图像。

公开(公告)号：US08390285B2

公开(公告)日：2013-03-05

申请号：US12842121

申请日：2010-07-23

申请人： Cai Xia Fu ,  Guo Bin Li

发明人： Cai Xia Fu ,  Guo Bin Li

IPC分类号： G01V3/00

CPC分类号： G01R33/485 ,  G01R33/56518

摘要： In a method and device for side-band suppression, a positive eddy current correction factor and negative eddy current correction factor are determined and scanning N/2 times by a positive gradient takes place, and the positive gradient scanning signal is collected during each scan. Scanning N/2 times by a negative gradient also takes place, and the negative gradient scanning signal is collected during each scan. N is an even number. An eddy current correction of the N/2 positive gradient scanning signals collected according to the positive eddy current correction factor is performed as an eddy current correction of the N/2 negative gradient scanning signals collected according to the negative eddy current correction factor. The side-band suppressed spectrum signal according to the N/2 positive gradient scanning signals that have undergone the eddy current correction is calculated, as is the N/2 negative gradient scanning signals that have undergone the eddy current correction. The method and device according to the present invention can effectively suppress the side band.

摘要翻译： 在用于边带抑制的方法和装置中，确定正涡流校正因子和负涡流校正因子，并且通过正梯度扫描N / 2次，并且在每次扫描期间收集正梯度扫描信号。 通过负梯度扫描N / 2次，并且在每次扫描期间收集负梯度扫描信号。 N是偶数。 根据正涡流校正因子收集的N / 2正梯度扫描信号的涡流校正被执行为根据负涡流校正因子收集的N / 2负梯度扫描信号的涡流校正。 根据已进行涡流校正的N / 2正梯度扫描信号计算侧带抑制频谱信号，以及已进行涡流校正的N / 2个负梯度扫描信号。 根据本发明的方法和装置可以有效地抑制边带。

公开(公告)号：US08131048B2

公开(公告)日：2012-03-06

申请号：US12344922

申请日：2008-12-29

申请人： Guo Bin Li ,  Bi Da Zhang

发明人： Guo Bin Li ,  Bi Da Zhang

IPC分类号： G06K9/00

CPC分类号： G01R33/561 ,  G01R33/4824 ,  G01R33/56509 ,  G01R33/56527 ,  G01R33/56536 ,  G01R33/56563

摘要： In a method and apparatus for correcting distortion during magnetic resonance imaging k space data in a number of readout encoding directions, sampling points on the phase encoding lines are primarily in low frequency regions of k space and the number of such sampling points is less than that of all sampling points. A view angle tilting compensation gradient is superimposed on the axis of a layer selection gradient. The k space data acquired from the number of directions are then combined.

摘要翻译： 在用于校正多个读出编码方向的磁共振成像k空间数据中的失真的方法和装置中，相位编码线上的采样点主要在k空间的低频区域中，并且这样的采样点的数量小于 的所有采样点。 视角倾斜补偿梯度叠加在层选择梯度的轴上。 然后组合从多个方向获得的k个空间数据。