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    Method and apparatus for a low complexity satellite ranging system using Gaussian noise overlay
    1.
    发明授权
    Method and apparatus for a low complexity satellite ranging system using Gaussian noise overlay 失效
    一种使用高斯噪声叠加的低复杂度卫星测距系统的方法和装置

    公开(公告)号：US5680143A

    公开(公告)日：1997-10-21

    申请号：US655111

    申请日：1996-05-29

    申请人： John Erik Hershey ,  Stephen Michael Hladik ,  Gary Jude Saulnier ,  David Allen Langan

    发明人： John Erik Hershey ,  Stephen Michael Hladik ,  Gary Jude Saulnier ,  David Allen Langan

    IPC分类号： G01S7/00 ,  G01S13/82 ,  H01Q3/22

    CPC分类号： G01S13/82 ,  H01Q3/22 ,  G01S7/006

    摘要： A ranging system for a communications spacecraft (14) overlays a Gaussian noise signal over a broadband channel which also carries information or traffic signals. The noise is used to establish the range between a ground station (12) and the spacecraft (14). The range is determined by delaying the Gaussian noise in a controllable delay (32), and autocorrelating the delayed noise with the noise returned over the communications channel from the spacecraft. The ranging system (FIG. 4) reduces the bandwidth of the noise in a filter (18) during initial acquisition, to color the noise and broaden the autocorrelation peak (FIG. 3a). The broad peak shortens the initial search time. Once the peak is initially found, the noise bandwidth is progressively broadened to narrow the autocorrelation peak (FIG. 3c) and to give a more accurate indication of range.

    摘要翻译： 用于通信航天器（14）的测距系统通过宽带信道覆盖高斯噪声信号，该信号还携带信息或业务信号。 噪声用于建立地面站（12）和航天器（14）之间的距离。 通过在可控延迟（32）中延迟高斯噪声来确定该范围，并且将延迟的噪声与从航天器通信通道返回的噪声自相关。 测距系统（图4）在初始采集期间降低了滤波器（18）中的噪声的带宽，以使噪声着色并扩大自相关峰值（图3a）。 宽峰缩短了初始搜索时间。 一旦最初发现峰值，噪声带宽逐渐变宽，以缩小自相关峰值（图3c）并给出更准确的范围指示。

    METHOD AND SYSTEM FOR CORRELATED NOISE SUPPRESSION IN DUAL ENERGY IMAGING
    2.
    发明申请
    METHOD AND SYSTEM FOR CORRELATED NOISE SUPPRESSION IN DUAL ENERGY IMAGING 有权
    双能量成像中相关噪声抑制的方法与系统

    公开(公告)号：US20120134561A1

    公开(公告)日：2012-05-31

    申请号：US12955227

    申请日：2010-11-29

    申请人： Dan Xu ,  David Allen Langan ,  Xiaoye Wu ,  Jed Douglas Pack ,  Andrea Marie Schmitz

    发明人： Dan Xu ,  David Allen Langan ,  Xiaoye Wu ,  Jed Douglas Pack ,  Andrea Marie Schmitz

    IPC分类号： G06K9/00

    CPC分类号： G06T11/008 ,  G06T5/002 ,  G06T5/50 ,  G06T2207/10081 ,  G06T2211/408

    摘要： Methods and systems for correlated noise suppression are presented. The present correlated noise suppression technique estimates a correlation direction between noise values in a first and a second MD image corresponding to a first and a second basis material, respectively. The two MD images are diffused using the estimated correlation direction to generate a first and a second diffused image. Further, first and second noise masks are generated by subtracting the diffused image from the corresponding MD image. Edges in the first and the second MD images are processed with the first and second noise masks, respectively to generate a final first noise mask and a final second noise mask. The first MD image is then processed with the final second noise mask to generate a final first MD image and the second MD image is processed with the final first noise mask to generate a final second MD image.

    摘要翻译： 提出了相关噪声抑制的方法和系统。 本相关噪声抑制技术分别估计与第一和第二基础材料对应的第一和第二MD图像中的噪声值之间的相关方向。 使用估计的相关方向来扩散两个MD图像以生成第一和第二扩散图像。 此外，通过从相应的MD图像中减去漫射图像来产生第一和第二噪声掩码。 第一和第二MD图像中的边缘分别用第一和第二噪声掩模进行处理，以产生最终的第一噪声掩模和最终的第二噪声掩模。 然后用最终的第二噪声掩码处理第一MD图像以产生最终的第一MD图像，并且用最终的第一噪声掩码处理第二MD图像以产生最终的第二MD图像。

    Method and apparatus for reduction of metal artifacts in CT images
    4.
    发明授权
    Method and apparatus for reduction of metal artifacts in CT images 有权
    减少CT图像中金属伪影的方法和装置

    公开(公告)号：US08503750B2

    公开(公告)日：2013-08-06

    申请号：US12574502

    申请日：2009-10-06

    申请人： Thomas Matthew Benson ,  Naveen Chandra ,  David Allen Langan

    发明人： Thomas Matthew Benson ,  Naveen Chandra ,  David Allen Langan

    IPC分类号： A61B6/03

    CPC分类号： G06T11/005 ,  A61B6/5258

    摘要： A method and apparatus include acquisition of a view dataset based on x-rays received by a detector corresponding to a energy level, reconstruction of an initial image using the view dataset, the initial image comprising a plurality of metal voxels at respective metal voxel locations, and generation of a metal mask corresponding to the plurality of metal voxels within the initial image. The method and apparatus also include forward projection of the metal mask onto the view dataset to identify metal dexels in the view dataset, performance of a weighted interpolation based on the identified metal dexels to generate a completed view dataset, reconstruction of a final image using the completed view dataset, the final image comprising a plurality of image voxels corresponding to the metal voxel locations, and replacement of a portion of the plurality of image voxels corresponding to the metal voxel locations with smoothed metal values.

    摘要翻译： 一种方法和装置包括：基于由能量级对应的检测器接收的X射线获取视图数据集，使用视图数据集重构初始图像，初始图像包括在相应的金属体素位置处的多个金属体素， 以及生成与初始图像内的多个金属体素相对应的金属掩模。 所述方法和装置还包括将金属掩模向视图数据集向前投影以识别视图数据集中的金属像素，基于所识别的金属像素来执行加权内插以生成完整的视图数据集，使用 完成的视图数据集，最终图像包括对应于金属体元位置的多个图像体素，以及用平滑的金属值替换与金属体元位置相对应的多个图像体素的一部分。

    SYSTEM AND METHOD TO OBTAIN NOISE MITIGTED MONOCHROMATIC REPRESENTATION FOR VARYING ENERGY LEVEL
    7.
    发明申请
    SYSTEM AND METHOD TO OBTAIN NOISE MITIGTED MONOCHROMATIC REPRESENTATION FOR VARYING ENERGY LEVEL 有权
    用于获得改变能量水平的噪声缓和单色表示的系统和方法

    公开(公告)号：US20090214095A1

    公开(公告)日：2009-08-27

    申请号：US12035072

    申请日：2008-02-21

    申请人： Xiaoye Wu ,  David Allen Langan ,  James Walter LeBlanc

    发明人： Xiaoye Wu ,  David Allen Langan ,  James Walter LeBlanc

    IPC分类号： G06K9/00

    CPC分类号： G06T5/002 ,  G06T2207/10081 ,  G06T2207/30004

    摘要： In dual energy CT, through basis material decomposition (BMD), a pair of density images can be reconstructed. The noises in this image pair are negatively correlated due to the BMD process. A technique is presented for obtaining the monochromatic images at desired energy levels with reduced correlation noise. The technique includes obtaining a plurality of optimum attenuation coefficients for an energy level, selecting a desired energy level, obtaining a plurality of desired attenuation coefficients for the desired energy level, computing a scaling factor for a corresponding noise component based on the optimum attenuation coefficients and the desired attenuation coefficients, and generating a monochromatic image based upon the scaling factor.

    摘要翻译： 在双能量CT中，通过基础材料分解（BMD），可以重构一对密度图像。 由于BMD过程，该图像对中的噪声是负相关的。 提出了一种技术，用于以降低的相关噪声在期望的能级获得单色图像。 该技术包括获得能量水平的多个最佳衰减系数，选择期望的能级，获得期望能级的多个期望衰减系数，基于最佳衰减系数计算相应噪声分量的缩放因子，以及 期望的衰减系数，以及基于缩放因子产生单色图像。

    METHOD AND SYSTEM FOR RECONSTRUCTING IMAGE VOLUMES FROM HELICAL SCAN ACQUISITIIONS
    8.
    发明申请
    METHOD AND SYSTEM FOR RECONSTRUCTING IMAGE VOLUMES FROM HELICAL SCAN ACQUISITIIONS 有权
    用于重新构建图像质量的方法和系统，从螺旋扫描获取

    公开(公告)号：US20080267476A1

    公开(公告)日：2008-10-30

    申请号：US11740002

    申请日：2007-04-25

    申请人： David Allen Langan ,  Peter Michael Edic ,  Xiaoye Wu ,  Jed Douglas Pack

    发明人： David Allen Langan ,  Peter Michael Edic ,  Xiaoye Wu ,  Jed Douglas Pack

    IPC分类号： G06K9/00

    CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/421

    摘要： A method and computer-readable medium for reconstructing an image volume of an object scanned in helical mode is provided. The method and computer-readable medium include obtaining one or more helical views corresponding to an image volume of an object and determining a plurality of discretized focal lengths within an imaging plane of the reconstructed field of view comprising the image volume. The method then comprises generating a plurality of circular scan sinograms for the plurality of discretized focal lengths. The plurality of circular scan sinograms are generated by interpolating the helical views. The method then comprises selecting one or more circular scan sinograms from the plurality of circular scan sinograms, based on the plurality of discretized focal lengths, wherein the selection is performed within a backprojection operation, for one or more image points within the imaging plane, over one or more circular views. The method then comprises using one or more of the selected circular scan sinograms, in the backprojection of one or more of the image points over one or more of the circular views. The method finally comprises performing a backprojection for all the image points over all the circular views to generate a reconstructed image of the object.

    摘要翻译： 提供了一种用于重建以螺旋模式扫描的对象的图像体积的方法和计算机可读介质。 所述方法和计算机可读介质包括获得对应于对象的图像体积的一个或多个螺旋视图，并且确定包括图像体积的重构视场的成像平面内的多个离散焦距。 该方法然后包括为多个离散焦距生成多个圆形扫描正弦图。 通过内插螺旋视图来产生多个圆形扫描正弦图。 该方法然后包括基于多个离散焦距从多个圆形扫描正弦图中选择一个或多个圆形扫描正弦图，其中在反投影操作内对成像平面内的一个或多个图像点进行选择 一个或多个圆形视图。 该方法然后包括在一个或多个圆形视图中的一个或多个图像点的反投影中使用所选择的圆形扫描正弦图中的一个或多个。 该方法最终包括对所有圆形视图上的所有图像点执行反投影以产生对象的重建图像。

    SYSTEMS AND METHODS FOR INTERVENTIONAL IMAGING
    10.
    发明申请
    SYSTEMS AND METHODS FOR INTERVENTIONAL IMAGING 审中-公开
    用于传统成像的系统和方法

    公开(公告)号：US20140037049A1

    公开(公告)日：2014-02-06

    申请号：US13563731

    申请日：2012-07-31

    申请人： David Allen Langan ,  Peter Michael Edic ,  Bernhard Erich Hermann Claus

    发明人： David Allen Langan ,  Peter Michael Edic ,  Bernhard Erich Hermann Claus

    IPC分类号： A61B6/03

    CPC分类号： A61B6/032 ,  A61B6/0457 ,  A61B6/12 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/507 ,  A61B6/541 ,  A61B6/542

    摘要： An imaging system including an integral computed tomography and interventional (CT/I) system that includes a large-area detector configured to acquire projection data corresponding to a field of view of the system from one or more view angles is presented. The system includes a computing device operatively coupled to the CT/I system and configured to process the acquired projection data to generate a 2D projection image in real-time, a 3D cross-sectional image of a region of interest in the subject, a combined image using the 2D projection image and the 3D cross-sectional image and/or control selective generation of the 2D projection image, the 3D cross-sectional image and/or the combined image based on one or more imaging specifications. The system also includes a display operatively coupled to the computing device and configured to display the 2D projection image, the 3D cross-sectional image and/or the combined image based on the imaging specifications.

    摘要翻译： 提供了一种成像系统，其包括整体计算机断层摄影和介入（CT / I）系统，其包括被配置为从一个或多个视角获取对应于系统的视场的投影数据的大面积检测器。 该系统包括可操作地耦合到CT / I系统并被配置为处理所获取的投影数据以实时生成2D投影图像的计算装置，对象中感兴趣区域的3D横截面图像，组合 基于一个或多个成像规格，使用2D投影图像和3D横截面图像和/或控制选择性地生成2D投影图像，3D横截面图像和/或组合图像的图像。 该系统还包括可操作地耦合到计算设备并且被配置为基于成像规格显示2D投影图像，3D横截面图像和/或组合图像的显示器。