中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

15 records (took 0.016 seconds)

    CT IMAGING METHODS AND SYSTEMS
    1.
    发明申请
    CT IMAGING METHODS AND SYSTEMS 有权
    CT成像方法和系统

    公开(公告)号：US20140369458A1

    公开(公告)日：2014-12-18

    申请号：US14304848

    申请日：2014-06-13

    Applicant: NUCTECH COMPANY LIMITED

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

    IPC: G01N23/04

    CPC classification number: G01N23/046 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5205 ,  A61B6/5258 ,  G06T11/005 ,  G06T11/006 ,  G06T2211/408 ,  G06T2211/436

    Abstract: Disclosed is a CT imaging method and system. The method includes: CT scanning an object with a dual-energy CT system to obtain a first complete set of projection data in a first scan mode, and to obtain a second incomplete set of projection data in a second scan mode; reconstructing a first attenuation coefficient image of the object from the first set of projection data, and extracting, from the first attenuation coefficient image, prior structure information of the object indicating edge intensity; and reconstructing a second attenuation coefficient image of the object from the second incomplete set of projection data using the extracted prior structure information as a constraint. With the method using the prior structure information of the imaged object as a constraint in reconstruction, it is possible to dramatically reduce an amount of data required for reconstruction, and achieve satisfactory effects even with ill-conditioned problems of limited-angle and inner reconstruction.

    Abstract translation: 公开了一种CT成像方法和系统。 该方法包括：用双能量CT系统对物体进行CT扫描，以第一扫描模式获得第一完整的投影数据集，并以第二扫描模式获得第二不完全投影数据集; 从所述第一组投影数据重建所述对象的第一衰减系数图像，并且从所述第一衰减系数图像提取所述对象的先前结构信息，指示边缘强度; 以及使用所提取的先前结构信息作为约束，从所述第二不完全投影数据集合重构所述对象的第二衰减系数图像。 通过使用成像对象的先前结构信息作为重建中的约束的方法，可以显着减少重建所需的数据量，并且即使在有限角度和内部重建的不良条件问题的情况下也能够获得令人满意的效果。

    SCANNING IMAGING SYSTEM FOR SECURITY INSPECTION OF AN OBJECT AND IMAGING METHOD THEREOF
    2.
    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.

    RADIATION PROTECTION ARRANGEMENT AND SECURITY INSPECTION DEVICE
    4.
    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.

    IMAGE PROCESSING METHOD, IMAGE PROCESSING DEVICE AND STORAGE MEDIUM
    5.
    发明申请
    IMAGE PROCESSING METHOD, IMAGE PROCESSING DEVICE AND STORAGE MEDIUM 审中-公开

    公开(公告)号：US20190206095A1

    公开(公告)日：2019-07-04

    申请号：US16235882

    申请日：2018-12-28

    Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

    Inventor： Yuxiang XING ,  Kaichao LIANG ,  Le SHEN ,  Li ZHANG ,  Hongkai YANG ,  Kejun KANG ,  Zhiqiang CHEN ,  Jianmin LI ,  Yinong LIU

    IPC: G06T11/00 ,  G06N3/08

    CPC classification number: G06T11/003

    Abstract: An image processing method, comprising: acquiring, by a CT scanning system, projection data of an object; and processing, by using a convolutional neural network, the projection data, to acquire an estimated image of the object. The convolutional neural network comprises: a projection domain network for processing input projection data to obtain estimated projection data; an analytical reconstruction network layer for performing analytical reconstruction to obtain a reconstructed image; an image domain network for processing the reconstructed image to obtain an estimated image, a projection layer for performing a projection operation by using a system projection matrix of the CT scanning system, to obtain a projection result of the estimated image; and a statistical model layer for determining consistency among the input projection data, the estimated projection data, and the projection result of the estimated image based on a statistical model.

    GRATING AND RADIATION IMAGING DEVICE
    6.
    发明申请
    GRATING AND RADIATION IMAGING DEVICE 审中-公开

    公开(公告)号：US20180075938A1

    公开(公告)日：2018-03-15

    申请号：US15802473

    申请日：2017-11-03

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Li ZHANG ,  Mingzhi HONG ,  Qingping HUANG ,  Le SHEN

    IPC: G21K1/06 ,  G02B5/18

    CPC classification number: G21K1/06 ,  G02B5/1838 ,  G21K1/025 ,  G21K2201/067 ,  G21K2207/005

    Abstract: The disclosure relates to a grating and a radiation imaging device. The grating comprises a plurality of stacked grating elements. The grating elements are stacked to form a grid. The grating element comprises a first sheet and a second sheet having two parallel planes. The second sheet is stacked at the first sheet in a length direction of the first sheet. The first sheet is almost impervious to radiation. The present disclosure stacks the sheets having different specifications together to form the grating with uniform grating slits, such that there is no limitation on the thickness of the grating and the grating can be used along with high-energy radiations.

    DETECTOR DEVICE, DUAL ENERGY CT SYSTEM AND DETECTION METHOD USING THE SYSTEM
    7.
    发明申请
    DETECTOR DEVICE, DUAL ENERGY CT SYSTEM AND DETECTION METHOD USING THE SYSTEM 有权
    检测器装置，双能量CT系统和使用该系统的检测方法

    公开(公告)号：US20150378047A1

    公开(公告)日：2015-12-31

    申请号：US14748407

    申请日：2015-06-24

    Applicant: Tsinghua University ,  Nuctech Company Limited

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

    IPC: G01V5/00 ,  G01T7/08

    CPC classification number: G01V5/0041 ,  A61B6/4266 ,  G01T1/202 ,  G01T1/362 ,  G01T7/08 ,  G01V5/005

    Abstract: The present disclosure discloses a detector device comprising a plurality of detector assemblies. Each detector assembly comprises at least one detection crystal units having a first energy response and those having a second energy response, which are both arranged along a first direction at intervals, each detection crystal unit having a first/second energy response including at least one detection crystals having a first/second energy response arranged along a second direction. The at least one detection crystal units having a first energy response and the at least one detection crystal units having a second energy response are, at least partially, alternatively arranged along the first direction when viewed from an incidence direction of the X-ray. The present disclosure also discloses a dual energy CT system having the detector device and a CT detection method using this system.

    Abstract translation: 本公开公开了一种包括多个检测器组件的检测器装置。 每个检测器组件包括具有第一能量响应的至少一个检测晶体单元和具有第二能量响应的检测晶体单元，它们都沿着第一方向间隔排列，每个检测晶体单元具有包括至少一个检测的第一/第二能量响应 具有沿第二方向布置的第一/第二能量响应的晶体。 当从X射线的入射方向观察时，具有第一能量响应的至少一个检测晶体单元和具有第二能量响应的至少一个检测晶体单元至少部分地沿第一方向布置。 本公开还公开了一种具有检测器装置和使用该系统的CT检测方法的双能CT系统。

    X-RAY DETECTION METHOD AND X-RAY DETECTOR
    9.
    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
    10.
    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。

Patent Agency Ranking