Autocorrection of MR images acquired using phased-array coils
    2.
    发明授权
    Autocorrection of MR images acquired using phased-array coils 有权
    使用相控阵线圈获得的MR图像的自动校正

    公开(公告)号:US06469506B1

    公开(公告)日:2002-10-22

    申请号:US09595272

    申请日:2000-06-15

    IPC分类号: G01V300

    CPC分类号: G01R33/3415

    摘要: An MRI image acquired with a phase-array coil is corrected for motion artifacts using an iterative, autocorrection process in which corrections are tried and the quality of the resulting reconstructed image is measured. In one embodiment autocorrections are calculated for the data acquired with one coil element and the same corrections are made to data acquired with the other coil elements. In another embodiment autocorrections are calculated separately for the data acquired with each coil element. In either embodiment, the separate corrected images are combined to form the output image.

    摘要翻译: 用相位阵列线圈获取的MRI图像使用迭代自动校正过程来校正运动伪像,其中尝试校正并测量所得到的重建图像的质量。 在一个实施例中,对于用一个线圈元件获取的数据计算自动校正,并且对与其它线圈元件获取的数据进行相同的校正。 在另一个实施例中,为每个线圈元件采集的数据分别计算自动校正。 在任一实施例中,组合分离的校正图像以形成输出图像。

    Autocorrection of 3D MR images for motion artifacts
    3.
    发明授权
    Autocorrection of 3D MR images for motion artifacts 有权
    自动校正运动伪像的三维MR图像

    公开(公告)号:US06307369B1

    公开(公告)日:2001-10-23

    申请号:US09614893

    申请日:2000-07-12

    IPC分类号: G01V300

    摘要: A three-dimensional image data set is acquired with an MRI system and autocorrected to reduce artifacts caused by subject motion during image acquisition. Correction for motion along one or two axes is performed by selecting a 2D slice of data and autocorrecting it to produce phase corrections that are then made to the entire 3D image data set. This may be repeated by autocorrecting an additional 2D slice perpendicular to the first 2D slice to produce phase corrections for the 3D image data set for motion along the third axis.

    摘要翻译: 利用MRI系统获取三维图像数据集并进行自动校正,以减少在图像采集期间由被摄体运动引起的伪像。 通过选择2D切片数据并对其进行自动校正来执行沿着一个或两个轴的运动的校正,以产生对整个3D图像数据集进行相位校正。 这可以通过自动校正垂直于第一2D切片的附加2D切片来重复,以产生用于沿着第三轴的运动的3D图像数据集的相位校正。

    System And Method For Improved Efficiency In Magnetic Resonance Elastography
    6.
    发明申请
    System And Method For Improved Efficiency In Magnetic Resonance Elastography 有权
    在磁共振弹性成像中提高效率的系统和方法

    公开(公告)号:US20140107467A1

    公开(公告)日:2014-04-17

    申请号:US14049632

    申请日:2013-10-09

    摘要: A system and method for generating a magnetic resonance elastography (MRE) report includes a) acquiring MRE data from a subject including positively motion encoded medical imaging data and negatively motion encoded medical imaging data and b) deriving uncorrected difference medical imaging data from the MRE data for a given slice. The method also includes c) filtering the uncorrected difference medical imaging data to create filtered medical imaging data corrected for errors associated with phase ramps occurring during gradient switching used to derive the positively motion encoded medical imaging data and negatively motion encoded medical imaging data, d) generating a corrected difference image for the given slice from the filtered medical imaging data and the uncorrected difference medical imaging data, e) repeating steps b) through d) for each slice reflected in the MRE data, and f) generating a report of elastic properties of the subject from the corrected difference image.

    摘要翻译: 用于产生磁共振弹性成像(MRE)报告的系统和方法包括:a)从主体获取MRE数据,包括正运动编码的医学成像数据和负运动编码的医学成像数据,以及b)从MRE数据导出未校正的差分医学成像数据 对于给定的切片。 该方法还包括:c)对未校正的差分医学成像数据进行滤波,以产生针对与用于导出正运动编码的医学成像数据和负运动编码的医学成像数据的梯形切换期间发生的相位斜坡相关的误差校正的滤波的医学成像数据,d) 从经滤波的医学成像数据和未校正的差分医学成像数据生成针对给定切片的校正差分图像,e)对在MRE数据中反映的每个切片重复步骤b)至d),以及f)生成弹性特性报告 从修正后的差分图像中获取。

    Method for reducing artifacts in NMR images
    7.
    发明授权
    Method for reducing artifacts in NMR images 失效
    减少核磁共振图像中伪像的方法

    公开(公告)号:US4715383A

    公开(公告)日:1987-12-29

    申请号:US928504

    申请日:1986-11-10

    摘要: A method for eliminating flow, motion and aliasing artifacts includes a series of saturation pulse sequences which are interleaved with the NMR pulse sequences used to acquire the data needed to reconstruct the desired image. Whereas, the NMR pulse sequences extract data from the volume of interest to be imaged, the saturation pulse sequences excite and saturate spins in the adjacent regions.

    摘要翻译: 用于消除流动,运动和混叠伪像的方法包括一系列饱和脉冲序列,其与用于获取重建所需图像所需的数据的NMR脉冲序列交错。 然而,NMR脉冲序列从要成像的感兴趣体积中提取数据,饱和脉冲序列激发并使相邻区域中的自旋饱和。

    Selective rephasing of NMR signals to suppress motion artifacts
    9.
    发明授权
    Selective rephasing of NMR signals to suppress motion artifacts 失效
    NMR信号的选择性重新定位以抑制运动伪影

    公开(公告)号:US4968935A

    公开(公告)日:1990-11-06

    申请号:US405892

    申请日:1989-09-11

    IPC分类号: G01R33/567

    CPC分类号: G01R33/56509

    摘要: Motion artifacts are selectively suppressed in an image by correcting only the NMR data in the central views. The peripheral views are not corrected with the result that motion artifacts produced by large objects in the image are suppressed while motion artifacts produced by small objects are not. Consequently, the interior of small blood vessels remain darker in the reconstructed image.

    摘要翻译: 通过仅校正中央视图中的NMR数据,在图像中选择性地抑制运动伪像。 周边视图不被校正,结果是由图像中的大对象产生的运动伪影被抑制,而由小对象产生的运动伪影不是。 因此,重建图像中小血管内部保持较暗。

    Adaptive method for reducing motion and flow artifacts in NMR images
    10.
    发明授权
    Adaptive method for reducing motion and flow artifacts in NMR images 失效
    用于减少NMR图像中的运动和流动伪影的自适应方法

    公开(公告)号:US4937526A

    公开(公告)日:1990-06-26

    申请号:US365632

    申请日:1989-06-13

    CPC分类号: G01R33/5676

    摘要: An NMR data set which is acquired with applied phase encoding and read-out gradients is corrected to reduce motion artifacts and increase image sharpness. The acquired NMR data set is examined to detect bulk displacements of the object being imaged and phase displacements caused by motion. This information is employed to produce correction operators which are applied to the NMR image data set. One or more navigator signals may also be acquired during the scan to produce an NMR data set from which the corrective operators can more readily be derived.

    摘要翻译: 校正采用施加的相位编码和读出梯度获得的NMR数据集,以减少运动伪影并增加图像清晰度。 检查获取的NMR数据集以检测被成像物体的体积位移和由运动引起的相位位移。 该信息用于产生应用于NMR图像数据集的校正算子。 也可以在扫描期间获取一个或多个导航信号以产生NMR数据集,校正操作者可从该数据集更容易地导出。