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    • 82. 发明授权
    • Clock filter dispersion
    • 时钟滤波器色散
    • US07822072B2
    • 2010-10-26
    • US11223878
    • 2005-09-09
    • Scott M. CarlsonMichel Henri Théodore HackLi Zhang
    • Scott M. CarlsonMichel Henri Théodore HackLi Zhang
    • H04J3/06G06F1/12G06F1/04
    • H04J3/0667
    • Disclosed are a method and system to estimate the maximum error in the clock offset and skew estimation between two clocks in a computer system. The method comprises the steps of obtaining a first set of data values representing a forward delay between the first and second clocks, and obtaining a second set of data values representing a negative backward delay between the first and second clocks. The method comprises the further step of forming a lower convex hull for said first set of data values, and forming an upper convex hull for said second set of data values. First and second parallel lines are formed between the upper and lower convex hulls, and these parallel lines are used to estimate the worst case error for the offset, skew rate and dispersion of said first and second clocks.
    • 公开了一种用于估计计算机系统中的两个时钟之间的时钟偏移和偏差估计中的最大误差的方法和系统。 该方法包括以下步骤:获得表示第一和第二时钟之间的正向延迟的第一组数据值,并获得表示第一和第二时钟之间的负向后延迟的第二组数据值。 该方法包括为所述第一组数据值形成下凸包的另一步骤,以及为所述第二组数据值形成上凸包。 第一和第二平行线形成在上和下凸包之间,并且这些平行线用于估计所述第一和第二时钟的偏移,偏移速率和色散的最差情况误差。
    • 88. 发明授权
    • X-CT scan system
    • X-CT扫描系统
    • US07760852B2
    • 2010-07-20
    • US12159640
    • 2006-12-14
    • Zhiqiang ChenKejun KangLi ZhangHaifeng HuYuxiang XingLiang LiYongshun XiaoZiran ZhaoYuanjing LiYinong Liu
    • Zhiqiang ChenKejun KangLi ZhangHaifeng HuYuxiang XingLiang LiYongshun XiaoZiran ZhaoYuanjing LiYinong Liu
    • A61B6/00
    • A61B6/032A61B6/587
    • An X-CT scan system includes a base, an object rotary support, an X-ray generation device and a data acquisition system, wherein one side of the detector is leveled to or beyond the prolong line of the connecting line between the X-ray source of the X-ray generation device and the center of the object rotary support, the length of the beyond portion is less than the radius of the imaging field. The advantage of the invention is in that the invention can reconstruct the entire image of the object by means of X-ray projection data which only covers half of the area of the object. Compared with the traditional CT scan system, half of the detector size can be saved at most. The X-CT scan system is simplified and the projection data amount for scan and computation amount for image reconstruction are also reduced with the reconstructed image quality guaranteed.
    • X-CT扫描系统包括基座,对象旋转支架,X射线产生装置和数据采集系统,其中检测器的一侧被平整到或超过X射线之间的连接线的延长线 X射线产生装置的源和对象旋转支架的中心,超出部分的长度小于成像场的半径。 本发明的优点在于,本发明可以通过仅覆盖对象区域的一半的X射线投影数据来重建物体的整个图像。 与传统CT扫描系统相比,检测器尺寸的一半最多可以节省。 X-CT扫描系统被简化,并且用于图像重建的扫描和计算量的投影数据量也被减少,重建图像质量得到保证。