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    MRI reconstruction using partial echo and partial NEX data acquisitions
    1.
    发明授权
    MRI reconstruction using partial echo and partial NEX data acquisitions 失效
    使用部分回波和部分NEX数据采集进行MRI重建

    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。

    Method and system for correcting errors in MR images due to regions of gradient non-uniformity for parametric imaging such as quantitative flow analysis
    3.
    发明授权
    Method and system for correcting errors in MR images due to regions of gradient non-uniformity for parametric imaging such as quantitative flow analysis 失效
    用于校正由于参数成像的梯度不均匀性区域（如定量流量分析）导致的MR图像误差的方法和系统

    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。

    Correction of artifacts caused by maxwell terms in slice offset echo planar imaging
    5.
    发明授权
    Correction of artifacts caused by maxwell terms in slice offset echo planar imaging 有权
    校正由切片偏移回波平面成像中的maxwell项引起的假象

    公开(公告)号：US06064205A

    公开(公告)日：2000-05-16

    申请号：US265259

    申请日：1999-03-09

    申请人： Xiaohong Zhou ,  Yiping Du ,  Matthew A. Bernstein ,  Hammond G. Reynolds ,  Joseph K. Maier ,  Jason A. Polzin

    发明人： Xiaohong Zhou ,  Yiping Du ,  Matthew A. Bernstein ,  Hammond G. Reynolds ,  Joseph K. Maier ,  Jason A. Polzin

    IPC分类号： G01R33/32 ,  A61B5/055 ,  G01R33/54 ,  G01R33/561 ,  G01R33/565 ,  G01V3/00

    CPC分类号： G01R33/56581 ,  G01R33/56554

    摘要： Two methods are disclosed to remove the image artifacts produced by Maxwell terms arising from the imaging gradients in an echo planar imaging pulse sequence. In the first method, the frequency and phase errors caused by the Maxwell terms are calculated on an individual slice basis and subsequently compensated during data acquisition by dynamically adjusting the receiver frequency and phase. In the second method, two linear phase errors, one in the readout direction and the other in the phase-encoding direction, both of which arise from the Maxwell terms, are calculated on an individual-slice basis. These errors are compensated for in the k-space data after data acquisition.

    摘要翻译： 公开了两种方法来去除由回波平面成像脉冲序列中的成像梯度引起的由麦克斯韦尔产生的图像伪影。 在第一种方法中，由麦克斯韦尔项引起的频率和相位误差在单独的切片基础上计算，并随后通过动态调整接收机频率和相位在数据采集期间进行补偿。 在第二种方法中，以单个切片为基础计算两个线性相位误差，一个在读出方向上，另一个在相位编码方向上，两个来自麦克斯韦术语。 这些误差在数据采集后的k空间数据中得到补偿。

    Method and system for estimating three-dimensional respiratory motion
    7.
    发明授权
    Method and system for estimating three-dimensional respiratory motion 有权
    估计三维呼吸运动的方法和系统

    公开(公告)号：US07844317B2

    公开(公告)日：2010-11-30

    申请号：US10723728

    申请日：2003-11-26

    申请人： Prathyusha K. Salla ,  Gopal B. Avinash ,  Jason A. Polzin

    发明人： Prathyusha K. Salla ,  Gopal B. Avinash ,  Jason A. Polzin

    IPC分类号： A61B5/05

    CPC分类号： A61B6/5217 ,  A61B5/0037 ,  A61B5/055 ,  A61B5/113 ,  A61B5/721 ,  A61B5/7289 ,  A61B5/7292 ,  A61B6/503 ,  A61B6/527 ,  A61B6/541 ,  G01R33/28 ,  G01R33/563

    摘要： One or more techniques are provided for measuring the motion of an organ in three dimensions. As provided by the technique, the motion of the organ along each dimension may be determined by a suitable methodology. Where sensor-based motion measurements are suitable, one or more sensors may be placed on a patient to measure internal motion of the organ of interest along one or more perpendicular axes. Where image-based techniques are suitable, the motion of the internal organ along a perpendicular axis may determined using pre-acquisition image data or acquisition image data when suitable. Concurrent motion vectors for all three dimensions may be obtained from the motion data acquired for the perpendicular axes by the disparate methodologies. The concurrent motion vectors may be combined to describe the three-dimensional motion of the organ over time. Validation of the motion data may be performed for each of the one-dimensional motion data sets using motion data acquired by image-based methods, or other image-based methods, for a respective axis.

    摘要翻译： 提供了一种或多种用于测量器官在三维中的运动的技术。 如该技术所提供的，器官沿着每个维度的运动可以通过合适的方法来确定。 在基于传感器的运动测量是合适的情况下，可以将一个或多个传感器放置在患者身上以测量沿着一个或多个垂直轴的感兴趣器官的内部运动。 在基于图像的技术是合适的情况下，内部器官沿着垂直轴的运动可以在适当时使用预采集图像数据或采集图像数据来确定。 可以通过不同的方法从垂直轴获取的运动数据中获得所有三维的并行运动矢量。 可以组合并行运动矢量以描述器官随时间的三维运动。 运动数据的验证可使用针对相应轴的基于图像的方法或其他基于图像的方法获取的运动数据来针对每个一维运动数据集执行。