公开(公告)号：US5604435A

公开(公告)日：1997-02-18

申请号：US581284

申请日：1995-12-29

申请人： Thomas K. Foo ,  Kevin F. King

发明人： Thomas K. Foo ,  Kevin F. King

IPC分类号： G01R33/48 ,  G01R33/50 ,  G01V3/00

CPC分类号： G01R33/50 ,  G01R33/446

摘要： A method is provided for rapidly measuring change in T.sub.2 * in a region of an MR imaging subject, the method employing a double gradient echo sequence with spiral readout. In this technique, two gradient echoes are acquired after a single RF excitation. A first readout trajectory spirals out from the center of k-space, i.e., k.sub.r =0, to some maximum radius, and then a second readout trajectory spirals back towards the center of k-space. A gradient echo is formed each time a k-space trajectory passes through the center of k-space. The signal intensity of the two echoes allows the calculation of the T.sub.2 * values on a pixel by pixel basis. The ability to measure changes in T.sub.2 * allows measurement of change in perfusion to be quantified.

摘要翻译： 提供了一种用于快速测量MR成像对象区域中T2 *的变化的方法，该方法采用具有螺旋读出的双梯度回波序列。 在这种技术中，在单个RF激发之后获得两个梯度回波。 第一个读出轨迹从k空间的中心，即kr = 0，螺旋向某一最大半径，然后第二个读出轨迹向k空间的中心旋转。 每当k空间轨迹穿过k空间的中心时形成梯度回波。 两个回波的信号强度允许逐个像素地计算T2 *值。 测量T2 *变化的能力允许测量灌注变化量化。

公开(公告)号：US20100308827A1

公开(公告)日：2010-12-09

申请号：US12860272

申请日：2010-08-20

申请人： Kevin M. Koch ,  Kevin F. King ,  Graeme C. McKinnon ,  Brian Hargreaves

发明人： Kevin M. Koch ,  Kevin F. King ,  Graeme C. McKinnon ,  Brian Hargreaves

IPC分类号： G01R33/48

CPC分类号： G01R33/56563 ,  G01R33/243 ,  G01R33/4822 ,  G01R33/5608

摘要： A system and method for multi-spectral MR imaging near metal include a computer programmed to calculate an MR pulse sequence comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients and determine a plurality of distinct offset frequency values. For each respective determined offset frequency value, the computer is programmed to execute the MR pulse sequence having a central transmit frequency and a central receive frequency of the MR pulse sequence set to the respective determined offset frequency value. The computer is also programmed to acquire a three-dimensional (3D) MR data set for each MR pulse sequence execution and generate a composite image based on data from each of the acquired 3D MR data sets.

摘要翻译： 用于金属附近的多光谱MR成像的系统和方法包括被编程为计算MR脉冲序列的计算机，该计算机包括被配置为激励成像对象中的自旋的多个RF脉冲，并且包括多个体积选择梯度并且确定多个不同的 偏移频率值。 对于每个相应确定的偏移频率值，计算机被编程为执行MR脉冲序列，该MR脉冲序列具有被设置为相应确定的偏移频率值的MR脉冲序列的中心发射频率和中心接收频率。 计算机还被编程为获取每个MR脉冲序列执行的三维（3D）MR数据集，并且基于来自每个获取的3D MR数据集的数据生成合成图像。

公开(公告)号：US07592809B1

公开(公告)日：2009-09-22

申请号：US11287184

申请日：2005-11-23

申请人： Kevin F. King ,  Dan Xu ,  Zhi-Pei Liang

发明人： Kevin F. King ,  Dan Xu ,  Zhi-Pei Liang

IPC分类号： G01V3/00

CPC分类号： G01R33/5611 ,  G01R33/56308

摘要： Variable-density (VD), sequentially-interleaved sampling of k-space coupled with the acquisition of reference frames of data is carried out to improve spatiotemporal resolution, image quality, and signal-to-noise ratio (SNR) of dynamic images. In one example, ktSENSE is implemented with a non-static regularization image, such as that provided by RIGR or similar technique, to acquire and reconstruct dynamic images. The integration of ktSENSE and RIGR, for example, provides dynamic images with higher spatiotemporal resolution and lower image artifacts compared to dynamic images acquired and reconstructed using ktSENSE alone.

摘要翻译： 执行可变密度（VD），与数据参考帧的采集相结合的k空间的顺序交错采样，以改善动态图像的时空分辨率，图像质量和信噪比（SNR）。 在一个示例中，ktSENSE通过诸如由RIGR或类似技术提供的非静态正则化图像来实现以获取和重建动态图像。 例如，与使用ktSENSE单独获取和重建的动态图像相比，ktSENSE和RIGR的集成提供了具有更高时空分辨率和较低图像伪影的动态图像。

公开(公告)号：US06983181B2

公开(公告)日：2006-01-03

申请号：US10063507

申请日：2002-05-01

申请人： Richard Scott Hinks ,  Kevin F. King ,  Jason A. Polzin

发明人： Richard Scott Hinks ,  Kevin F. King ,  Jason A. Polzin

IPC分类号： A61B5/55

CPC分类号： G01R33/56375 ,  G01R33/385

摘要： The present invention includes a technique for use with magnetic resonance imaging that includes the application of a non-linear, higher-order gradient field in the presence of a moving object to be scanned. MR data is acquired as the object moves through the non-linear gradient field. Resulting images are contiguous and do not require the patching together of data in either k-space or image space and result in an image with expanded FOV in a longitudinal direction of the moving object.

公开(公告)号：US06242916B1

公开(公告)日：2001-06-05

申请号：US09441799

申请日：1999-11-17

申请人： Kevin F. King

发明人： Kevin F. King

IPC分类号： G01V300

CPC分类号： G01R33/5611 ,  G01R33/3415 ,  G01R33/56

摘要： Two incomplete k-space data sets are acquired with an MRI system using two surface coils. The data from the two surface coils is combined in a Sense process to reduce aliasing artifacts in the reconstructed image. The incomplete k-space data is filled out using a modified Homodyne reconstruction method which preserves phase information for the Sense process.

摘要翻译： 使用两个表面线圈的MRI系统获取两个不完整的k空间数据集。 来自两个表面线圈的数据在Sense过程中组合以减少重建图像中的混叠伪像。 使用修改的零差重建方法填充了不完整的k空间数据，该方法保留了Sense过程的相位信息。

公开(公告)号：US5170346A

公开(公告)日：1992-12-08

申请号：US440531

申请日：1989-11-22

申请人： Carl R. Crawford ,  Kevin F. King

发明人： Carl R. Crawford ,  Kevin F. King

IPC分类号： A61B6/03 ,  G06T1/00 ,  G06T11/00

CPC分类号： A61B6/032 ,  A61B6/027 ,  G06T11/005

摘要： A method of reducing artifacts in images acquired with fan beam, helical scanning, tomographic imaging systems, applies a weighting function to the tomographic projection set. The weighting function reduces the contribution to the final image of projection data with large helical offset. Other redundant data within the projection set is increased in weight by the weighting function to prevent image artifacts from the weighting. In one embodiment, the projection set is centered on the slice plane to avoid discontinuities in the projection data caused by the weighting functions.

公开(公告)号：US07821264B2

公开(公告)日：2010-10-26

申请号：US12016331

申请日：2008-01-18

申请人： Kevin M. Koch ,  Kevin F. King ,  Reed F. Busse

发明人： Kevin M. Koch ,  Kevin F. King ,  Reed F. Busse

IPC分类号： G01V3/00

CPC分类号： G01R33/243 ,  G01R33/4822 ,  G01R33/5608 ,  G01R33/56563

摘要： An apparatus and method for MR imaging in inhomogeneous magnetic fields includes acquisition of a plurality of three-dimensional (3D) MR data sets, each data set having a central transmit frequency and a central receive frequency set to a frequency offset that is distinct for each 3D MR data set. A composite image is generated based on the plurality of 3D MR data sets.

摘要翻译： 用于不均匀磁场中的MR成像的装置和方法包括获取多个三维（MR）MR数据集，每个数据集具有中心发射频率和中心接收频率，该频率偏移设定为每个 3D MR数据集。 基于多个3D MR数据集生成合成图像。

公开(公告)号：US20090039882A1

公开(公告)日：2009-02-12

申请号：US11781025

申请日：2007-07-20

申请人： Kevin F. King ,  Richard S. Hinks

发明人： Kevin F. King ,  Richard S. Hinks

IPC分类号： G01R33/565

CPC分类号： G01R33/56518 ,  G01R33/5611 ,  G01R33/5615 ,  G01R33/5617

摘要： Coil sensitivity of a receive coil to a gradient null location is measured and, from the measurements, a coil calibration value is determined and used to modify the MR data acquired with that receive coil to reduce the adverse effects of gradient nulling on MR images. Coil sensitivity values are determined for each coil of a coil array and the data for each coil is respectively weighted. An image that is substantially free of gradient null artifacts or ghosting is then reconstructed from the weighted data.

摘要翻译： 测量接收线圈到梯度零点位置的线圈灵敏度，并且从测量中确定线圈校准值并用于修改用该接收线圈获取的MR数据，以减少梯度零点对MR图像的不利影响。 对于线圈阵列的每个线圈确定线圈灵敏度值，并且分别对每个线圈的数据进行加权。 然后从加权数据重建基本上不含梯度零伪影或重影的图像。

公开(公告)号：US07064547B1

公开(公告)日：2006-06-20

申请号：US10710133

申请日：2004-06-21

申请人： Kevin F. King ,  Elisabeth Angelos ,  Jason A. Polzin

发明人： Kevin F. King ,  Elisabeth Angelos ,  Jason A. Polzin

IPC分类号： G01V3/00

CPC分类号： G01R33/5611

摘要： A system and method for MR imaging with coil sensitivity or calibration data acquisition for reducing wrapping or aliasing artifacts is disclosed. Low resolution MR data representative of coil sensitivity of a coil arrangement within an FOV is acquired prior to application of an imaging data acquisition scan and is used to reduce wrapping or aliasing artifacts in a reconstructed image.

摘要翻译： 公开了一种用于减少包装或混叠伪像的线圈灵敏度或校准数据采集的MR成像系统和方法。 在施加成像数据采集扫描之前获取表示FOV内的线圈装置的线圈灵敏度的低分辨率MR数据，并用于减少重建图像中的包裹或混叠伪影。

公开(公告)号：US06291997B1

公开(公告)日：2001-09-18

申请号：US09452440

申请日：1999-12-02

申请人： Kevin F. King ,  Alexander Ganin ,  Neville D. Gai

发明人： Kevin F. King ,  Alexander Ganin ,  Neville D. Gai

IPC分类号： G01V300

CPC分类号： G01R33/56518 ,  G01R33/3852

摘要： Image artifacts produced by residual magnetization in elements of the gradient field amplifier system are reduced by driving the residual magnetization to a preselected value at the end of each imaging pulse sequence. Reset gradient pulses are produced by the gradient field amplifier system after each signal is acquired to drive the residual magnetization to a selected value. A number of different reset gradient waveforms may be used, and they may be produced in a number of different ways.

摘要翻译： 通过在每个成像脉冲序列结束时将残余磁化驱动到预选值，减少梯度场放大器系统的元件中由残余磁化产生的图像伪影。 在获取每个信号之后，由梯度场放大器系统产生复位梯度脉冲以将剩余磁化驱动到所选择的值。 可以使用多个不同的复位梯度波形，并且它们可以以多种不同的方式产生。