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    • 43. 发明授权
    • Data aided detection of spectrum inversion
    • 频谱反演的数据辅助检测
    • US08306156B2
    • 2012-11-06
    • US11873923
    • 2007-10-17
    • Li Zhang
    • Li Zhang
    • H03D3/22
    • H04N5/455H04L27/22H04L2027/0065H04L2027/0095H04N5/4401H04N21/4382H04N21/6143
    • Methods and apparatuses to detect spectrum inversion based on estimated frequency offset in carrier signal. In one embodiment, a receiver includes an I/Q swap module to output an in-phase component and a quadrature-phase component; a frequency offset estimator to determine an offset in carry frequency of the in-phase and quadrature-phase components; and a spectrum inversion detector coupled to the frequency offset estimator and the I/Q swap module. The spectrum inversion detector is configured to signal the I/Q swap module to swap the in-phase component and the quadrature-phase component when an absolute value of the offset in carry frequency is above a predetermined threshold.
    • 基于载波信号估计频率偏移检测频谱反演的方法和装置。 在一个实施例中,接收机包括输出同相分量和正交相分量的I / Q交换模块; 频率偏移估计器,用于确定同相和正交相分量的进位频率中的偏移; 以及耦合到频率偏移估计器和I / Q交换模块的频谱反转检测器。 频谱反转检测器被配置为当进位频率中的偏移的绝对值高于预定阈值时,信号I / Q交换模块交换同相分量和正交相分量。
    • 48. 发明申请
    • Computer Tomography Imaging Device and Method
    • 计算机断层扫描成像装置及方法
    • US20120140874A1
    • 2012-06-07
    • US13322696
    • 2009-12-30
    • Liang LiZhiqiang ChenLi ZhangKejun KangYuanjing LiYinong LiuYuxiang XingZiran Zhao
    • Liang LiZhiqiang ChenLi ZhangKejun KangYuanjing LiYinong LiuYuxiang XingZiran Zhao
    • A61B6/03A61B6/08
    • A61B6/032A61B6/06A61B6/4452A61B6/469G06T11/006G06T2211/416G06T2211/421G06T2211/424
    • The present invention discloses a method for performing CT imaging on a region of interest of an object under examination, comprising: acquiring the CT projection data of the region of interest; acquiring the CT projection data of region B; selecting a group of PI line segments covering the region of interest, and calculating the reconstruction image value for each PI line segment in the group; and combining the reconstruction image values in all the PI line segments to obtain the image of the region of interest. The present invention further discloses a CT imaging device using this method and a data processor therein. Since the 2D/3D slice image of the region of interest can be exactly reconstructed and obtained as long as the X-ray beam covers the region of interest and the region B, it is possible to use a small-sized detector to perform CT imaging on the region of interest at any position of a large-sized object, which reduces to a great extent the radiation dose of the X-ray during the CT scanning.
    • 本发明公开了一种对被检查物体的感兴趣区域进行CT成像的方法,包括:获取感兴趣区域的CT投影数据; 获取区域B的CT投影数据; 选择覆盖感兴趣区域的一组PI线段,并计算组中每个PI线段的重建图像值; 并且将所有PI线段中的重建图像值组合以获得感兴趣区域的图像。 本发明还公开了一种使用该方法的CT成像装置及其中的数据处理器。 由于只要X射线束覆盖感兴趣区域和区域B,就可以精确地重构和获得感兴趣区域的2D / 3D切片图像,因此可以使用小尺寸检测器来执行CT成像 在大尺寸物体的任何位置处的感兴趣区域,其在CT扫描期间在很大程度上降低X射线的辐射剂量。