公开(公告)号：US20070238974A1

公开(公告)日：2007-10-11

申请号：US11697380

申请日：2007-04-06

申请人： Chen Lin ,  Matthew A. Bernstein

发明人： Chen Lin ,  Matthew A. Bernstein

IPC分类号： G01V3/00 ,  A61B5/05

CPC分类号： G01R33/4818 ,  G01R33/4822 ,  G01R33/5602 ,  G01R33/5608

摘要： A magnetization preparation pulse is followed by acquiring a segment of k-space data during an acquisition window in which a desired tissue contrast is achieved. Views sampling the center of k-space are acquired at peak contrast and peripheral k-space is sampled before and after this optimal contrast time.

摘要翻译： 磁化准备脉冲之后是在获得期望的组织对比度的采集窗口期间获取一个k空间数据段。 在峰值对比度下采集k空间中心的视图采样，并且在该最佳对比度时间之前和之后对外围k空间进行采样。

公开(公告)号：US06288544B1

公开(公告)日：2001-09-11

申请号：US09552177

申请日：2000-04-18

申请人： Matthew A. Bernstein ,  Tsur Bernstein

发明人： Matthew A. Bernstein ,  Tsur Bernstein

IPC分类号： G01V300

CPC分类号： G01R33/56308 ,  G01R33/4835 ,  G01R33/56509

摘要： An MRI system acquires MRA data from two overlapping thin slabs using a 3DTOF pulse sequence. Motion artifacts are reduced by using a reverse centric phase encode order during the first thin slab acquisition and a centric phase encode order during the second thin slab acquisition. Patient movement is reduced by producing a uniform sound with gradient pulse sequences during the interval between thin slab acquisitions and during a preparation period prior to the first thin slab acquisition.

摘要翻译： MRI系统使用3DTOF脉冲序列从两个重叠的薄板获取MRA数据。 在第一薄板采集期间使用反向中心相位编码顺序并在第二薄板采集期间以中心相位编码顺序减少运动伪影。 通过在薄板获得之间的间隔期间和在第一薄板获取之前的准备阶段期间产生具有梯度脉冲序列的均匀声音来减少患者运动。

公开(公告)号：US6166545A

公开(公告)日：2000-12-26

申请号：US219129

申请日：1998-12-22

申请人： Jason A. Polzin ,  Matthew A. Bernstein ,  Thomas K. F. Foo

发明人： Jason A. Polzin ,  Matthew A. Bernstein ,  Thomas K. F. Foo

IPC分类号： G01R33/561 ,  G01V3/00

CPC分类号： G01R33/561

摘要： A system and method is disclosed to combine both a fractional echo (k.sub.x) and a fractional NEX (k.sub.y) to reduce acquisition times and echo times in MR imaging. The method uses both zero-filling and homodyne reconstruction to construct concurrent fractional NEX and fractional echo data in a single image while minimizing any blurring effects. The system includes acquiring partial MRI data in the k.sub.x direction and acquiring partial MRI data in the k.sub.y direction. Once a partial echo and a partial NEX are acquired, the missing data is first zero-filled in the k.sub.x direction and Fourier transformed to acquire a full x direction data set. Next, the data is synthesized in the k.sub.y direction using a homodyne reconstruction technique to acquire a full data set in the k.sub.y direction. The full x,y data set can then be used to reconstruct an MR image with reduced acquisition and echo times. In order to minimize the effects of blurring in the resulting MR image, it is preferable to acquire at least an 80% fractional echo and a 60% fractional NEX. The system can be extended to any number of desirable dimensions.

摘要翻译： 公开了将分数回波（kx）和分数NEX（ky）组合以减少MR成像中的采集时间和回波时间的系统和方法。 该方法使用零填充和零差重建来构建单个图像中的并发分数NEX和分数回波数据，同时最小化任何模糊效果。 该系统包括以kx方向获取部分MRI数据并且获取ky方向上的部分MRI数据。 一旦获得了部分回波和部分NEX，则丢失的数据首先在kx方向上零填充，并进行傅里叶变换以获取全x方向数据集。 接下来，使用零差重建技术以ky方向合成数据，以获取ky方向上的完整数据集。 然后可以使用完整的x，y数据集来重建具有减少的采集和回波时间的MR图像。 为了最小化所得MR图像中模糊的影响，优选获得至少80％的分数回波和60％的分数NEX。 该系统可以扩展到任何数量的所需尺寸。

公开(公告)号：US5877629A

公开(公告)日：1999-03-02

申请号：US831546

申请日：1997-04-08

申请人： Kevin F. King ,  Alexander Ganin ,  Xiaohang Zhou ,  Matthew A. Bernstein

发明人： Kevin F. King ,  Alexander Ganin ,  Xiaohang Zhou ,  Matthew A. Bernstein

IPC分类号： G01R33/561 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/56554 ,  G01R33/4824 ,  G01R33/56581

摘要： Artifacts in NMR images produced by Maxwell terms during non-rectilinear scans, such as spiral scans, are reduced or eliminated. Phase corrections for in-plane and through-plane blurring are used to offset Maxwell terms errors.

摘要翻译： 减少或消除在非直线扫描（如螺旋扫描）期间由麦克斯韦尔术语产生的NMR图像中的伪像。 用于平面和平面模糊的相位校正用于抵消麦克斯韦尔术语误差。

公开(公告)号：US5642047A

公开(公告)日：1997-06-24

申请号：US569617

申请日：1995-12-08

申请人： Matthew A. Bernstein

发明人： Matthew A. Bernstein

IPC分类号： G01R33/565 ,  G01R33/20

CPC分类号： G01R33/56518

摘要： A method for correcting MR data elements acquired in the presence of an imperfectly linear gradient field, each element comprising nominal first and second quadrature components. The quadrature components are multiplied by an artifact correction factor to provide respective first and second quantities. A Gradwarp geometric correction operation is applied to respective quantities to provide a corrected first and second quadrature component, corresponding to each data element. For a given data element, the arctangent function is applied to the result obtained by dividing the first corrected component by the second corrected component to provide a corrected phase component for use in forming an image.

摘要翻译： 一种用于校正在存在不完全线性梯度场获得的MR数据元素的方法，每个元素包括标称的第一和第二正交分量。 正交分量乘以伪像校正因子以提供相应的第一和第二量。 将Gradwarp几何校正操作应用于各个量以提供对应于每个数据元素的校正的第一和第二正交分量。 对于给定的数据元素，反正切函数被应用于通过将第一校正分量除以第二校正分量而获得的结果，以提供用于形成图像的校正相位分量。

公开(公告)号：US07245124B2

公开(公告)日：2007-07-17

申请号：US11341242

申请日：2006-01-27

申请人： Yunhong Shu ,  Matthew A. Bernstein

发明人： Yunhong Shu ,  Matthew A. Bernstein

IPC分类号： G01V3/00

CPC分类号： G01R33/54 ,  G01R33/56509

摘要： A 3D MRI image is acquired as a series of spherical shells of increasing radius. Each shell is sampled by one or more interleaved spiral sampling trajectories and to shorten the scan time one or more spiral sampling trajectories are skipped in the larger shells that sample the periphery of k-space. Motion correction of the acquired k-space data is accomplished by reconstructing tracking images from each of the shells and locating markers therein which indicate object movement from a reference position. The k-space data is corrected using this movement information.

摘要翻译： 获取3D MRI图像作为一系列增加半径的球形壳体。 每个壳体被一个或多个交错螺旋采样轨迹采样，并缩短扫描时间，在较大的壳中跳过一个或多个螺旋取样轨迹，该较大的壳体对k空间的外围进行采样。 所获取的k空间数据的运动校正通过从每个壳体和其中定位标记重建跟踪图像来实现，其中指示物体从参考位置移动。 使用该移动信息来校正k空间数据。

公开(公告)号：US6163152A

公开(公告)日：2000-12-19

申请号：US97525

申请日：1998-06-15

申请人： Matthew A. Bernstein ,  Jason A. Polzin

发明人： Matthew A. Bernstein ,  Jason A. Polzin

IPC分类号： A61B5/055 ,  G01R33/54 ,  G01R33/565 ,  G01V3/00

CPC分类号： G01R33/56518

摘要： A system and method for correcting systematic errors that occur in MR images due to magnetic gradient non-uniformity is disclosed for use with parametric analysis. A GradWarp geometric correction operation is applied in reconstructing quantitative parametric analysis images in regions of gradient non-uniformity. The method includes generating an error map of magnetic gradient strength as a function of distance for an MR image scan and acquiring MR data that contain such systematic errors. The method next includes either calculating a measured diffusion image, a phase difference image, or similar image, based on the acquired MR data, and then calculating a corrected parametric image using the error map and the measured diffusion image, the phase difference image, or other similar parametric image. The method is incorporated into a system having a computer programmed to perform the aforementioned steps and functions.

摘要翻译： 公开了一种用于校正由于磁梯度不均匀性而在MR图像中发生的系统误差的系统和方法，用于参数分析。 应用GradWarp几何校正操作重建梯度不均匀区域的定量参数分析图像。 该方法包括产生磁梯度强度的误差图，作为MR图像扫描的距离的函数，并获取包含这种系统误差的MR数据。 该方法接下来包括基于获取的MR数据计算测量的漫射图像，相位差图像或类似图像，然后使用误差图和测量的漫射图像，相位差图像或 其他类似的参数图像。 该方法被并入具有被编程为执行上述步骤和功能的计算机的系统中。

公开(公告)号：US5399969A

公开(公告)日：1995-03-21

申请号：US102661

申请日：1993-08-05

申请人： Matthew A. Bernstein

发明人： Matthew A. Bernstein

IPC分类号： G01R33/32 ,  A61B5/055 ,  G01R33/385 ,  G01R33/54 ,  G01V3/00

CPC分类号： G01R33/4833 ,  G01R33/385

摘要： A method for providing an indication of the limits of available functional gradient power when MRI equipment is used to obtain oblique MRI images calculates a "maximum absolute row sum" of a rotational matrix defining the degree obliquity of the image. This maximum absolute row sum provides one or more target functional gradient values based on the limitations of the physical gradients of the system.

摘要翻译： 当MRI设备用于获得倾斜MRI图像时，用于提供可用功能梯度功率限制的指示的方法计算定义图像的度倾斜度的旋转矩阵的“最大绝对行和”。 该最大绝对行总和基于系统的物理梯度的限制提供一个或多个目标函数梯度值。

公开(公告)号：US5170122A

公开(公告)日：1992-12-08

申请号：US735419

申请日：1991-07-25

申请人： Matthew A. Bernstein

发明人： Matthew A. Bernstein

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

CPC分类号： G01R33/5613 ,  G01R33/561

摘要： A steady-state free procession fast NMR pulse sequence includes a readout gradient waveform which refocuses the transverse magnetization to produce an S- NMR signal during the subsequent pulse sequence. A partial echo signal acquisition is acquired which enables the pulse sequence to be shortened and enables the S+ NMR signal to be displaced from the data acquisition window without disturbing the flow compensation. View reordering is used in combination with phase cycling to suppress the S+ NMR signal.

公开(公告)号：US20080183067A1

公开(公告)日：2008-07-31

申请号：US12018899

申请日：2008-01-24

申请人： Yunhong Shu ,  Matthew A. Bernstein

发明人： Yunhong Shu ,  Matthew A. Bernstein

IPC分类号： A61B5/055

CPC分类号： G01R33/561 ,  G01R33/4824 ,  G01R33/5635

摘要： A method for prescribing a scan on an MRI system includes selecting a general pulse sequence to be used during a time-resolved imaging process of a subject using an MRI system. The method also includes setting a first set of scan parameters to more specifically prescribe the general pulse sequence and setting a second set of scan parameters using a formula that relates time resolution and spatial resolution resulting from the first set of scan parameters. The method then includes performing the time-resolved imaging process using the general pulse sequence, the first set of scan parameters, and the second set of scan parameters.

摘要翻译： 用于在MRI系统上规定扫描的方法包括选择将在使用MRI系统的对象的时间分辨成像处理期间使用的一般脉冲序列。 该方法还包括设置第一组扫描参数以更具体地规定通用脉冲序列，并使用涉及由第一组扫描参数产生的时间分辨率和空间分辨率的公式来设置第二组扫描参数。 该方法然后包括使用通用脉冲序列，第一组扫描参数和第二组扫描参数执行时间分辨成像处理。