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公开(公告)号：US06771732B2
公开(公告)日：2004-08-03
申请号：US10190295
申请日：2002-07-05
申请人： Shu Xiao , Yoram Bresler , David C. Munson, Jr.
发明人： Shu Xiao , Yoram Bresler , David C. Munson, Jr.
IPC分类号： A61B603
CPC分类号： G06T11/006 , A61B6/027 , Y10S378/901
摘要： A fast method for divergent-beam backprojection is proposed for generating an electronic image from a preprocessed divergent-beam sonogram, the sinogram being a collection of divergent beam projections. The method consists of the following steps: subdividing the sinogram into multiple sub-sinograms; performing a weighted backprojection of said sub-sinograms, to produce multiple corresponding sub-images; and aggregating said sub-images to create the electronic image. The subdivision of the sinogram into sub-sinograms can be performed in a recursive manner. A dual of the proposed method provides a fast means for reprojecting an electronic image, i.e., generating a divergent-beam sinogram from the image. These methods are applicable to fan-beam and cone-beam tomography utilizing a variety of scanning trajectories, including spiral. These methods do not require rebinning, and offer speedups similar to the FFT when compared to conventional backprojection and reprojection algorithms. Substantial computational savings are obtained without perceptible degradation or significant loss of numerical accuracy.
摘要翻译： 提出了一种用于发散光束反投影的快速方法，用于从预处理的发散束超声波图生成电子图像，正弦图是发散光束投影的集合。 该方法包括以下步骤：将正弦图细分为多个子图; 执行所述子图像的加权反投影，以产生多个相应的子图像; 并聚合所述子图像以创建电子图像。 正弦图的细分可以以递归的方式进行。 所提出的方法的双重提供了用于重新投影电子图像的快速手段，即从图像生成发散光束正弦图。 这些方法适用于使用各种扫描轨迹（包括螺旋）的扇形束和锥束断层摄影。 与传统的反投影和重新投影算法相比，这些方法不需要重组，并提供与FFT类似的加速。 获得了大量的计算节省，而没有可察觉的退化或数值精度的显着损失。
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公开(公告)号：US20080297405A1
公开(公告)日：2008-12-04
申请号：US12080927
申请日：2008-04-07
IPC分类号： G01S13/90
CPC分类号： G01S13/90
摘要： The present application describes an apparatus that includes a radar antenna device to acquire synthetic aperture radar data, radar receiver and transmitter equipment coupled to the radar antenna device, and a synthetic aperture radar processing device in communication with the radar receiver and transmitter equipment. This processing device includes a processor structured to process the synthetic aperture radar data, which is representative of a defocused image. The processor is further structured to define an image processing constraint corresponding to an image region expected to have a low radar return and generate one or more output signals as a function of the image processing constraint and the data. The one or more output signals are representative of a more focused form of the defocused image.
摘要翻译： 本申请描述了一种装置，其包括用于获取合成孔径雷达数据的雷达天线装置，耦合到雷达天线装置的雷达接收机和发射机设备，以及与雷达接收机和发射机设备通信的合成孔径雷达处理装置。 该处理装置包括处理器，其构造成处理代表散焦图像的合成孔径雷达数据。 处理器进一步被构造为定义对应于预期具有低雷达返回的图像区域的图像处理约束，并且根据图像处理约束和数据生成一个或多个输出信号。 一个或多个输出信号表示散焦图像的更聚焦形式。
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