公开(公告)号：US20140021951A1

公开(公告)日：2014-01-23

申请号：US13870063

申请日：2013-04-25

申请人： Kecheng Liu ,  Tiejun Zhao

发明人： Kecheng Liu ,  Tiejun Zhao

IPC分类号： G01R33/561

CPC分类号： G01R33/561 ,  G01R33/5602 ,  G01R33/56563 ,  G01R33/5659

摘要： A system acquires MR image data of a portion of patient anatomy associated with spin lattice relaxation time in a rotating frame using an RF (Radio Frequency) signal generator and a magnetic field gradient generator. The RF (Radio Frequency) signal generator generates RF excitation pulses in anatomy and enables subsequent acquisition of associated RF echo data. The magnetic field gradient generator generates anatomical volume select magnetic field gradients for phase encoding and readout RF data acquisition in a three dimensional (3D) anatomical volume. The RF signal generator and the gradient generator use in order, a saturation pulse, a T1 spin lattice relaxation rotating frame preparation pulse sequence and a spoiler gradient, in acquiring image data of the 3D volume showing luminance contrast associated with T1 spin lattice relaxation in a rotating frame.

摘要翻译： 系统使用RF（射频）信号发生器和磁场梯度发生器，在旋转帧中获取与自旋晶格弛豫时间相关联的患者解剖结构的一部分的MR图像数据。 RF（射频）信号发生器在解剖学中产生RF激励脉冲，并且能够随后获取相关的RF回波数据。 磁场梯度发生器产生用于三维（3D）解剖体积中的相位编码和读出RF数据采集的解剖体积选择磁场梯度。 RF信号发生器和梯度发生器以饱和脉冲，T1自旋晶格弛豫旋转帧准备脉冲序列和扰流器梯度顺序使用，以获得显示与T1自旋晶格弛豫相关联的亮度对比度的3D体积的图像数据 旋转框架

公开(公告)号：US20100271021A1

公开(公告)日：2010-10-28

申请号：US12430546

申请日：2009-04-27

申请人： Kecheng Liu ,  YongMing Dai ,  Tiejun Zhao ,  Thorsten Feiweier ,  Jing An

发明人： Kecheng Liu ,  YongMing Dai ,  Tiejun Zhao ,  Thorsten Feiweier ,  Jing An

IPC分类号： G01R33/48 ,  G01R33/44

CPC分类号： G01R33/56341

摘要： An apparatus and method for obtaining diffusion weighted magnetic resonance images (DW-MRI) is described. The properties of the diffusion tensor in tissue are measured by applying a diffusion weighting gradient oriented along a plurality of measurement axes. The value of the magnetic field is increased by using as many of the magnetic gradient coils as are effective in contributing the gradient field strength along the axis being. In regions where the magnetic field gradient is increased, the echo time (TE) may be decreased, increasing the signal-to-noise ratio of the measurements. Alternatively, the number of measurements than are averaged to achieve a particular image quality may be decreased, reducing the patient exposure time.

摘要翻译： 描述了用于获得扩散加权磁共振图像（DW-MRI）的装置和方法。 通过施加沿多个测量轴定向的扩散加权梯度来测量组织中的扩散张量的性质。 通过使用有效地贡献沿轴线的梯度场强度的磁化梯度线圈数来增加磁场的值。 在磁场梯度增加的区域中，可以减小回波时间（TE），增加测量的信噪比。 或者，可以减少平均以获得特定图像质量的测量次数，减少患者暴露时间。

公开(公告)号：US09759795B2

公开(公告)日：2017-09-12

申请号：US13870063

申请日：2013-04-25

申请人： Kecheng Liu ,  Tiejun Zhao

发明人： Kecheng Liu ,  Tiejun Zhao

IPC分类号： G01V3/00 ,  G01R33/561 ,  G01R33/56 ,  G01R33/565

CPC分类号： G01R33/561 ,  G01R33/5602 ,  G01R33/56563 ,  G01R33/5659

摘要： A system acquires MR image data of a portion of patient anatomy associated with spin lattice relaxation time in a rotating frame using an RF (Radio Frequency) signal generator and a magnetic field gradient generator. The RF (Radio Frequency) signal generator generates RF excitation pulses in anatomy and enables subsequent acquisition of associated RF echo data. The magnetic field gradient generator generates anatomical volume select magnetic field gradients for phase encoding and readout RF data acquisition in a three dimensional (3D) anatomical volume. The RF signal generator and the gradient generator use in order, a saturation pulse, a T1 spin lattice relaxation rotating frame preparation pulse sequence and a spoiler gradient, in acquiring image data of the 3D volume showing luminance contrast associated with T1 spin lattice relaxation in a rotating frame.

公开(公告)号：US08768034B2

公开(公告)日：2014-07-01

申请号：US13603679

申请日：2012-09-05

申请人： Kecheng Liu ,  Tiejun Zhao

发明人： Kecheng Liu ,  Tiejun Zhao

IPC分类号： G06K9/00

CPC分类号： G01R33/5673

摘要： A method provides motion corrected MR image data in an MR imaging system. The method employs an imaging method for acquiring k-space data of a k-space data array during an imaging scan and the k-space data represents image data of a patient anatomical region. The method acquires k-space data associated with a central region of the k-space data array and subsequently acquires k-space data external to the central region of the k-space data array. The method acquires a motion signal indicating respiratory motion at least during the acquisition of the k-space data external to the central region and compares the motion signal with a predetermined threshold. The method identifies acquired k-space data corresponding to acquisition periods when the motion signal exceeds the threshold and excludes use of the identified acquired k-space data in image reconstruction using the remaining acquired k-space data.

摘要翻译： 一种方法在MR成像系统中提供运动校正的MR图像数据。 该方法采用成像方法，用于在成像扫描期间获取k空间数据阵列的k空间数据，并且k空间数据表示患者解剖区域的图像数据。 该方法获取与k空间数据阵列的中心区域相关联的k空间数据，随后获取k空间数据阵列的中心区域外部的k空间数据。 该方法至少在获取中心区域外部的k空间数据期间获取指示呼吸运动的运动信号，并将运动信号与预定阈值进行比较。 该方法识别当运动信号超过阈值时与采集周期相对应的获取的k空间数据，并且使用剩余的所获取的k空间数据来排除在图像重建中使用所识别的所获取的k空间数据。

公开(公告)号：US08456163B2

公开(公告)日：2013-06-04

申请号：US12727275

申请日：2010-03-19

申请人： Tiejun Zhao

发明人： Tiejun Zhao

IPC分类号： G01R33/44 ,  G01R33/48

CPC分类号： G01R33/4826 ,  G01R33/4816

摘要： A system acquires frequency domain components representing MR image data. An RF coil emits RF pulses for use in acquiring multiple individual frequency components corresponding to individual data elements in a 3D storage array in which the individual frequency components are successively acquired along radii from a designated center representing an origin to a boundary of the storage array. Angles of successive radii with respect to the origin are successively changed to substantially fill the storage array volume during acquisition of an MR dataset representing an MR image. A computation processor determines the angles of successive radii with respect to the origin, in response to data representing a reduction in at least one dimension of the 3D imaging volume represented by the storage array. A storage processor stores individual frequency components, acquired using the emitted RF pulses, in corresponding individual data elements in the array.

摘要翻译： 系统获取表示MR图像数据的频域分量。 RF线圈发射RF脉冲，用于获取对应于3D存储阵列中的各个数据元素的多个单独频率分量，其中，从表示原点的指定中心到存储阵列的边界的半径，连续获取各个频率分量。 相对于原点的连续半径的角度在采集表示MR图像的MR数据集期间被依次改变为基本上填充存储阵列体积。 响应于表示由存储阵列表示的3D成像体积的至少一个维度的减小的数据，计算处理器确定相对于原点的连续半径的角度。 存储处理器将使用发射的RF脉冲获取的各个频率分量存储在阵列中的对应的单独数据元素中。

公开(公告)号：US20110006765A1

公开(公告)日：2011-01-13

申请号：US12727275

申请日：2010-03-19

申请人： Tiejun Zhao

发明人： Tiejun Zhao

IPC分类号： G01R33/44

CPC分类号： G01R33/4826 ,  G01R33/4816

摘要： A system acquires frequency domain components representing MR image data. An RF coil emits RF pulses for use in acquiring multiple individual frequency components corresponding to individual data elements in a 3D storage array in which the individual frequency components are successively acquired along radii from a designated center representing an origin to a boundary of the storage array. Angles of successive radii with respect to the origin are successively changed to substantially fill the storage array volume during acquisition of an MR dataset representing an MR image. A computation processor determines the angles of successive radii with respect to the origin, in response to data representing a reduction in at least one dimension of the 3D imaging volume represented by the storage array. A storage processor stores individual frequency components, acquired using the emitted RF pulses, in corresponding individual data elements in the array.

摘要翻译： 系统获取表示MR图像数据的频域分量。 RF线圈发射RF脉冲，用于获取对应于3D存储阵列中的各个数据元素的多个单独频率分量，其中，从表示原点的指定中心到存储阵列的边界的半径，连续获取各个频率分量。 相对于原点的连续半径的角度在采集表示MR图像的MR数据集期间被依次改变为基本上填充存储阵列体积。 响应于表示由存储阵列表示的3D成像体积的至少一个维度的减小的数据，计算处理器确定相对于原点的连续半径的角度。 存储处理器将使用发射的RF脉冲获取的各个频率分量存储在阵列中的对应的单独数据元素中。

公开(公告)号：US20130251225A1

公开(公告)日：2013-09-26

申请号：US13603679

申请日：2012-09-05

申请人： Kecheng Liu ,  Tiejun Zhao

发明人： Kecheng Liu ,  Tiejun Zhao

IPC分类号： G06K9/36

CPC分类号： G01R33/5673

摘要： A method provides motion corrected MR image data in an MR imaging system. The method employs an imaging method for acquiring k-space data of a k-space data array during an imaging scan and the k-space data represents image data of a patient anatomical region. The method acquires k-space data associated with a central region of the k-space data array and subsequently acquires k-space data external to the central region of the k-space data array. The method acquires a motion signal indicating respiratory motion at least during the acquisition of the k-space data external to the central region and compares the motion signal with a predetermined threshold. The method identifies acquired k-space data corresponding to acquisition periods when the motion signal exceeds the threshold and excludes use of the identified acquired k-space data in image reconstruction using the remaining acquired k-space data.

摘要翻译： 一种方法在MR成像系统中提供运动校正的MR图像数据。 该方法采用成像方法，用于在成像扫描期间获取k空间数据阵列的k空间数据，并且k空间数据表示患者解剖区域的图像数据。 该方法获取与k空间数据阵列的中心区域相关联的k空间数据，随后获取k空间数据阵列的中心区域外部的k空间数据。 该方法至少在获取中心区域外部的k空间数据期间获取指示呼吸运动的运动信号，并将运动信号与预定阈值进行比较。 该方法识别当运动信号超过阈值时对应于获取周期的获取的k空间数据，并且使用剩余的获取的k空间数据来排除在图像重建中使用所识别的所获取的k空间数据。

公开(公告)号：US08274283B2

公开(公告)日：2012-09-25

申请号：US12430546

申请日：2009-04-27

申请人： Kecheng Liu ,  YongMing Dai ,  Tiejun Zhao ,  Thorsten Feiweier ,  Jing An

发明人： Kecheng Liu ,  YongMing Dai ,  Tiejun Zhao ,  Thorsten Feiweier ,  Jing An

IPC分类号： G01V3/00

CPC分类号： G01R33/56341

摘要： An apparatus and method for obtaining diffusion weighted magnetic resonance images (DW-MRI) is described. The properties of the diffusion tensor in tissue are measured by applying a diffusion weighting gradient oriented along a plurality of measurement axes. The value of the magnetic field is increased by using as many of the magnetic gradient coils as are effective in contributing the gradient field strength along the axis being. In regions where the magnetic field gradient is increased, the echo time (TE) may be decreased, increasing the signal-to-noise ratio of the measurements. Alternatively, the number of measurements than are averaged to achieve a particular image quality may be decreased, reducing the patient exposure time.

摘要翻译： 描述了用于获得扩散加权磁共振图像（DW-MRI）的装置和方法。 通过施加沿多个测量轴定向的扩散加权梯度来测量组织中的扩散张量的性质。 通过使用有效地贡献沿轴线的梯度场强度的磁化梯度线圈数来增加磁场的值。 在磁场梯度增加的区域中，可以减小回波时间（TE），增加测量的信噪比。 或者，可以减少平均以获得特定图像质量的测量次数，减少患者暴露时间。