知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

14 records (took 0.018 seconds)

    SCANNING IMAGING SYSTEM FOR SECURITY INSPECTION OF AN OBJECT AND IMAGING METHOD THEREOF
    1.
    发明申请
    SCANNING IMAGING SYSTEM FOR SECURITY INSPECTION OF AN OBJECT AND IMAGING METHOD THEREOF 审中-公开

    公开(公告)号：US20190094407A1

    公开(公告)日：2019-03-28

    申请号：US16037810

    申请日：2018-07-17

    Applicant: Nuctech Company Limited ,  Tsinghua University

    Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Le SHEN ,  Qingping HUANG ,  Yunda SUN ,  Xin JIN ,  Hui DING ,  Yuxiang XING

    IPC: G01V5/00 ,  G01N23/046

    Abstract: The disclosure provides a scanning imaging system for security inspection of an object and an imaging method thereof, the system comprising: a conveying unit configured for bringing the object to move along a conveying direction; a plurality of radiographic sources at one side of the conveying unit, being arranged successively in a direction vertical to a plane, in which the conveying unit is located, and configured for alternately emitting ray beams to form a scanning area; a linear detector array at the other side of the conveying unit, being configured for detecting first projection images, which are formed after the ray beams emitted by the plurality of radiographic sources penetrate through the object, in the process of the object passing through the scanning area; an imaging unit configured for obtaining a first reconstructed image of the object based on the first projection images of the plurality of radiographic sources.

    CT SYSTEMS AND METHODS THEREOF
    4.
    发明申请
    CT SYSTEMS AND METHODS THEREOF 有权
    CT系统及其方法

    公开(公告)号：US20150185355A1

    公开(公告)日：2015-07-02

    申请号：US14576737

    申请日：2014-12-19

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Qingping HUANG ,  Xin JIN ,  Yunda SUN ,  Le SHEN ,  Ji ZHAO

    IPC: G01V5/00 ,  G01T7/08 ,  G01N23/04 ,  G06T11/00

    CPC classification number: G01V5/005 ,  G01N23/046 ,  G01T7/08 ,  G06T11/003 ,  G06T2207/10072 ,  G06T2211/40

    Abstract: A CT system and method thereof are discloses. The system includes: a conveyor mechanism; a first scanning stage configured to scan the object and generate a first digital signal; a second scanning stage spaced from the first scanning stage at a preset distance in a direction of the object's movement; a processing device configured to reconstruct a CT image of the object at a first image quality based on the first digital signal, and analyze the CT image; and a control device configured to adjust a scanning parameter of the second scanning stage based on an analysis result of the processing device to cause the second scanning stage to output a second digital signal. The processing device reconstructs a CT image of the object at a second image quality higher than the first image quality at least based on the second digital signal. The system takes full advantage of the distributed ray sources which replace the normal slip ring technology.

    Abstract translation: 公开了一种CT系统及其方法。 该系统包括：输送机构; 第一扫描台，被配置为扫描所述物体并产生第一数字信号; 第二扫描台，在所述物体运动的方向上以预定的距离与所述第一扫描台隔开; 处理装置，被配置为基于所述第一数字信号以第一图像质量重建所述对象的CT图像，并分析所述CT图像; 以及控制装置，其被配置为基于所述处理装置的分析结果来调整所述第二扫描级的扫描参数，以使所述第二扫描级输出第二数字信号。 处理装置至少基于第二数字信号，以比第一图像质量高的第二图像质量重构对象的CT图像。 该系统充分利用了代替普通滑环技术的分布式射线源。

    X-RAY DETECTION METHOD AND X-RAY DETECTOR
    7.
    发明申请
    X-RAY DETECTION METHOD AND X-RAY DETECTOR 审中-公开

    公开(公告)号：US20190086562A1

    公开(公告)日：2019-03-21

    申请号：US16175796

    申请日：2018-10-30

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Yuxiang XING ,  Xiaoyue GUO ,  Zhi DENG ,  Le SHEN ,  Li ZHANG ,  Zhiqiang CHEN ,  Liang LI

    IPC: G01T1/36 ,  G01N23/04

    Abstract: An X-ray detection method and an X-ray detector are provided. The X-ray detection method according to embodiments of the present disclosure includes: dividing an energy range of photons emitted by an X-ray source into a number N of energy windows, where N is an integer greater than 0; obtaining a weighting factor for each of the number N of energy windows based on linear attenuation coefficients of a substance of interest and a background substance of an imaging target; obtaining a weighting factor matrix for M output channels of an X-ray detector based on the weighting factor for each of the number N of energy windows, where M is an integer greater than 0; and obtaining output results of the M output channels based on the weighting factor matrix and numbers of photons having an energy range falling into individual energy windows of the number N of energy windows.

    MULTI-SPECTRAL STATIC CT APPARATUSES
    8.
    发明申请
    MULTI-SPECTRAL STATIC CT APPARATUSES 有权
    多光谱静态CT设备

    公开(公告)号：US20150185357A1

    公开(公告)日：2015-07-02

    申请号：US14577069

    申请日：2014-12-19

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Qingping HUANG ,  Yunda SUN ,  Xin JIN ,  Tao YANG ,  Le SHEN ,  Ji ZHAO

    IPC: G01V5/00 ,  G01N23/04

    CPC classification number: G01V5/0041 ,  G01N23/046 ,  G01T1/2985 ,  G01V5/005

    Abstract: Multi-spectral static CT apparatuses are disclosed. The apparatus includes a ray source in a form of multiple distributed spots, multiple columns of detectors, a data acquisition device, an article carrying and control device, and a multi-spectral projection data processing device. An object of the present disclosure is to combine static CT scanning technology with multi-spectral analysis technology. It has an advantage of a static CT system, such as high scanning speed, simple mechanic structure, and/or cost reduction due to omission of slip ring. It also can perform identification of material in an article, and can be widely applied in occasions such as safety inspection, and smuggling suppression at customs.

    Abstract translation: 公开了多光谱静态CT装置。 该装置包括多个分布点的形式的射线源，多列检测器，数据采集装置，物品携带和控制装置以及多光谱投影数据处理装置。 本公开的目的是将静态CT扫描技术与多光谱分析技术相结合。 它具有静电CT系统的优点，如扫描速度快，机械结构简单，和/或由于省略滑环而降低成本。 也可以在物品中进行材料鉴定，并可广泛应用于安全检查，海关走私等场合。

    X-RAY DUAL-ENERGY CT RECONSTRUCTION METHOD
    9.
    发明申请
    X-RAY DUAL-ENERGY CT RECONSTRUCTION METHOD 有权
    X射线双能CT重建方法

    公开(公告)号：US20150030225A1

    公开(公告)日：2015-01-29

    申请号：US14337209

    申请日：2014-07-22

    Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

    Inventor： Yuxiang XING ,  Le SHEN ,  Li ZHANG ,  Zhiqiang CHEN ,  Liang LI

    IPC: G06T11/00 ,  G06T5/00 ,  G01N23/04

    CPC classification number: G01N23/046 ,  G06T11/006 ,  G06T2207/10081 ,  G06T2207/20182 ,  G06T2207/30004 ,  G06T2211/408 ,  G06T2211/424

    Abstract: 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.

    Abstract translation: 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。

    RADIATION PROTECTION ARRANGEMENT AND SECURITY INSPECTION DEVICE
    10.
    发明公开
    RADIATION PROTECTION ARRANGEMENT AND SECURITY INSPECTION DEVICE 审中-公开

    公开(公告)号：US20240361487A1

    公开(公告)日：2024-10-31

    申请号：US18690097

    申请日：2022-07-22

    Applicant: NUCTECH COMPANY LIMITED ,  TSINGHUA UNIVERSITY

    Inventor： Li ZHANG ,  Yunda SUN ,  Xin JIN ,  Wuyang LIANG ,  Ming CHANG ,  Le SHEN

    IPC: G01V5/22

    CPC classification number: G01V5/22

    Abstract: A radiation protection arrangement, including: a housing, the housing including a first port and a second port; and a tray, the tray having an accommodation space. The tray is allowed to pass through a channel within the housing. The tray has a first end wall, a second end wall, and a bottom portion connected between the first end wall and the second end wall. A shape of the first end wall and/or a shape of the second end wall are/is configured to fit with an inner wall of the housing, so as to block a radiation from leaving the channel from the accommodation space through the second port or the first port. Further provided is a security inspection device, including the radiation protection arrangement.

Patent Agency Ranking