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255 条记录 (耗时 0.021 秒)

    Method and system for estimating point spread function
    92.
    发明授权
    Method and system for estimating point spread function 有权

    公开(公告)号：US10152774B2

    公开(公告)日：2018-12-11

    申请号：US15217613

    申请日：2016-07-22

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： Kejun Kang ,  Zhiqiang Chen ,  Yuanjing Li ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jianping Gu ,  Zhiming Wang

    IPC分类号： G06K9/00 ,  G06T5/00 ,  G06T7/77 ,  G06T7/44

    摘要： The present disclosure relates to a method and device for estimating a point spread function. In one implementation, a method includes capturing, by a scanning device, an image by scanning a plurality of rectangle blocks which are same sized and closely arranged, wherein the plurality of rectangle blocks are made of different materials and/or have different mass thicknesses, and an incident direction of rays is perpendicular to a scanning direction and a surface of the plurality of rectangle blocks arranged closely during scanning; obtaining line spread functions for two directions along a length side and a width side of each of the rectangle blocks based on the scanned image, and obtaining standard deviation parameters of the line spread functions; and combining the standard deviation parameters for the two directions to obtain a two dimensional Point Spread Function (PSF) parameter so as to estimate the point spread function.

    X-ray dual-energy CT reconstruction method
    98.
    发明授权
    X-ray dual-energy CT reconstruction method 有权
    X射线双能CT重建方法

    公开(公告)号：US09513235B2

    公开(公告)日：2016-12-06

    申请号：US14337209

    申请日：2014-07-22

    申请人： TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

    发明人： Yuxiang Xing ,  Le Shen ,  Li Zhang ,  Zhiqiang Chen ,  Liang Li

    IPC分类号： G01N23/04 ,  G06T11/00

    CPC分类号： G01N23/046 ,  G06T11/006 ,  G06T2207/10081 ,  G06T2207/20182 ,  G06T2207/30004 ,  G06T2211/408 ,  G06T2211/424

    摘要： The present disclosure relates to a self-prior information based X-ray dual-energy CT reconstruction method, which can utilize information inherent in data to provide a prior model, thereby obtaining a reconstructed image with a high quality. The X-ray dual-energy CT reconstruction method according to the present disclosure comprises: (a) rating an energy spectrum and establishing a dual-energy lookup table; (b) collecting high-energy data pH and low-energy data pL of a dual-energy CT imaging system using a detector of the dual-energy CT imaging system; (c) obtaining projection images R1 and R2 of scaled images r1 and r2 according to the obtained high-energy data pH and low-energy data pL; (d) reconstructing the scaled image r2 using a first piece-wise smooth constraint condition and thereby obtaining an electron density image; and (e) reconstructing the scaled image r1 using a second piece-wise smooth constraint condition and thereby obtaining an equivalent atomic number image. In the present disclosure, the noise in the dual-energy reconstructed image can be effectively prohibited while keeping the resolution by effectively using information inherent in data.

    摘要翻译： 本公开涉及一种基于自我先验信息的X射线双能CT重建方法，其可以利用数据中固有的信息来提供先验模型，从而获得具有高质量的重建图像。 根据本公开的X射线双能CT重建方法包括：（a）评估能谱并建立双能量查找表; （b）使用双能CT成像系统的检测器收集双能CT成像系统的高能数据pH和低能量数据pL; （c）根据获得的高能量数据pH和低能量数据pL，获得缩放图像r1和r2的投影图像R1和R2; （d）使用第一分段平滑约束条件重建缩放图像r2，从而获得电子密度图像; 和（e）使用第二分段平滑约束条件重建缩放图像r1，从而获得等效的原子序数图像。 在本公开中，可以有效地禁止双能量重构图像中的噪声，同时通过有效地使用数据中固有的信息来保持分辨率。

    Human Body Security Inspection Apparatus
    99.
    发明申请
    Human Body Security Inspection Apparatus 审中-公开
    人体安全检查仪器

    公开(公告)号：US20160187529A1

    公开(公告)日：2016-06-30

    申请号：US14958245

    申请日：2015-12-03

    申请人： Nuctech Company Limited ,  Tsinghua University

    发明人： Zhiqiang Chen ,  Ziran Zhao ,  Wanlong Wu ,  Lin Yang ,  Yingkang Jin ,  Ming Ruan ,  Chengcong Xu

    IPC分类号： G01V8/00 ,  G01S13/88 ,  G01S13/89 ,  G01V3/12

    CPC分类号： G01S13/887 ,  G01S13/89 ,  G01V3/12 ,  G01V8/005

    摘要： The present disclosure provides a human body security inspection apparatus, comprising: a base on which an inspected human stands; a millimeter-wave transceiver configured to perform a millimeter-wave scanning operation on the body of the inspected human standing on the base so as to detect whether or not the inspected human carries contraband and output a first signal; and a metal sensing detector arranged within the base and configured to detect whether or not there is a metallic foreign object in underside of a shoe of the inspected human and output a second signal.

    摘要翻译： 本公开提供一种人体安全检查装置，包括：被检查人员所在的基座; 毫米波收发器被配置为对所检查的人体在基座上的身体执行毫米波扫描操作，以便检测被检查的人是否携带违禁品并输出第一信号; 以及金属感测检测器，其布置在所述基座内并且被配置为检测所检查的人的鞋的下侧中是否存在金属异物并输出第二信号。

    Method and device for inspection of liquid articles
    100.
    发明授权
    Method and device for inspection of liquid articles 有权
    液体制品检验方法及装置

    公开(公告)号：US09121811B2

    公开(公告)日：2015-09-01

    申请号：US13946498

    申请日：2013-07-19

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： Zhiqiang Chen ,  Li Zhang ,  Xuewu Wang ,  Haifeng Hu ,  Hongxin Wu ,  Yuanjing Li ,  Yinong Liu ,  Ziran Zhao ,  Yuxiang Xing ,  Hu Tang ,  Yumin Yi ,  Jinyu Zhang

    IPC分类号： A61B6/00 ,  G01N23/10 ,  G01N23/04 ,  G01V5/00 ,  G01N1/02 ,  A61B6/02

    CPC分类号： G01N23/10 ,  A61B6/027 ,  G01N23/046 ,  G01N2001/022 ,  G01N2223/419 ,  G01N2223/423 ,  G01N2223/637 ,  G01N2223/639 ,  G01V5/00

    摘要： Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether there are drugs concealed in the inspected liquid article based on the difference between the acquired physical attributes and reference physical attributes of the inspected liquid article. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

    摘要翻译： 公开了一种用于双能CT成像的液体物品的安全检查方法和装置。 该方法包括以下步骤：通过CT扫描获得包括待检查的液体物品的物理属性的一个或多个CT图像和双能量重建方法; 从CT图像获取每个液体物品的物理属性; 并且基于被检查的液体制品的所获取的物理属性和参考物理属性之间的差异来确定在被检查的液体制品中是否存在隐藏的药物。 CT扫描可以通过正常的CT扫描技术或螺旋CT扫描技术来实现。 在正常的CT扫描技术中，扫描位置可以由操作员预先设置，或者通过DR图像设置，或者通过DR图像的自动分析设置。