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37 条记录 (耗时 0.176 秒)

    APPARATUS AND A METHOD FOR GENERATING A FLATTENING X-RAY RADIATION FIELD
    1.
    发明申请
    APPARATUS AND A METHOD FOR GENERATING A FLATTENING X-RAY RADIATION FIELD 有权
    装置和产生平滑X射线辐射场的方法

    公开(公告)号：US20150085989A1

    公开(公告)日：2015-03-26

    申请号：US14494178

    申请日：2014-09-23

    申请人： NUCTECH COMPANY LIMITED ,  Tsinghua University

    发明人： Kejun Kang ,  Chuanxiang Tang ,  Huaping Tang ,  Huaibi Chen ,  Wenhui Huang

    IPC分类号： H01J35/14 ,  H01J35/10

    CPC分类号： H01J35/14 ,  A61N5/1077 ,  H01J35/06 ,  H01J35/106 ,  H01J2235/068 ,  H01J2235/086 ,  H01J2235/1262 ,  H05H7/06

    摘要： An apparatus and a method are for generating a flattening x-ray radiation field. The apparatus includes: plurality of electron accelerators for generating high-energy electron beam current; and a common target unit including a vacuum target chamber, a target and plurality of input connectors. The plurality of input connectors are connected to one side of the vacuum target chamber and the target is installed at the other side of the vacuum target chamber opposing the plurality of input connectors, the axes of which intersect in pairs at one point in an predetermined included angle. The plurality of electron accelerators are connected to the plurality of input connectors.

    摘要翻译： 一种用于产生平坦的x射线辐射场的装置和方法。 该装置包括：多个用于产生高能电子束电流的电子加速器; 以及包括真空靶室，靶和多个输入连接器的公共目标单元。 多个输入连接器连接到真空靶室的一侧，并且目标件安装在真空靶室的与多个输入连接器相对的另一侧，多个输入连接器的轴线在预定的包括的一个点处成对地相交 角度。 多个电子加速器连接到多个输入连接器。

    Scan method, scan system and radiation scan controller
    3.
    发明授权
    Scan method, scan system and radiation scan controller 有权

    公开(公告)号：US10578765B2

    公开(公告)日：2020-03-03

    申请号：US16253221

    申请日：2019-01-22

    申请人： NUCTECH COMPANY LIMITED ,  TSINGHUA UNIVERSITY

    发明人： Kejun Kang ,  Yaohong Liu ,  Ziran Zhao ,  Wei Jia ,  Jianping Gu ,  Chuanxiang Tang ,  Huaibi Chen ,  Jianjun Gao ,  Wei Yin ,  Xiying Liu

    IPC分类号： G01V5/00 ,  G01T1/29 ,  G01N23/04

    摘要： This invention provides a scan method, scan system and radiation scan controller, and relates to the field of radiation. The scanning method includes obtaining detection data of an object to be inspected under radiation scanning using a detector, adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data. With this method, working conditions of the accelerator of the radiation emission device may be adjusted according to the detection data detected by the detector, so that for a region having a larger mass thickness, a higher output beam dose rate or a higher electron beam output energy level is adopted to guarantee satisfied imaging technical indexes, for a region having a smaller mass thickness, a lower output beam dose rate or a lower electron beam output energy level is adopted to reduce the environmental dose level while guaranteeing satisfied imaging technical indexes.

    Dual-energy ray imaging methods and systems
    4.
    发明授权
    Dual-energy ray imaging methods and systems 有权

    公开(公告)号：US10339673B2

    公开(公告)日：2019-07-02

    申请号：US15129455

    申请日：2015-12-23

    申请人： Tsinghua University ,  NUCTECH COMPANY LIMITED

    发明人： Liang Li ,  Zhiqiang Chen ,  Kejun Kang ,  Li Zhang ,  Ziran Zhao ,  Yuxiang Xing ,  Yongshun Xiao ,  Jianping Gu ,  Juan Zheng

    IPC分类号： G01N23/04 ,  G06T11/00 ,  G06T7/00

    摘要： Disclosed is a dual-energy ray imaging method and system. The method comprises: calculating the mass thicknesses of the materials in the overlapped area of two materials by using a calibrated surface fitting method, and then decomposing a pair of original high-energy and low-energy data for this pixel into two high-low-energy data sets corresponding to the two materials, and finally calculating and acquiring the composition result of different materials for each pixel. The disclosure is especially advantageous in that the problem of error recognition of materials due to the two overlapped materials can be eliminated and the stratified imaging of multiple materials can be achieved, thereby improving the accuracy of the substance recognition and reducing the rate of false positive and false negative which is very important to the applications in the field of security check and anti-smuggling.

    Method and system for estimating point spread function
    5.
    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.

    CT DEVICES AND METHODS THEREOF
    9.
    发明申请
    CT DEVICES AND METHODS THEREOF 有权
    CT装置及其方法

    公开(公告)号：US20150342013A1

    公开(公告)日：2015-11-26

    申请号：US14758484

    申请日：2013-11-21

    申请人： TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

    发明人： Kejun Kang ,  Chuanxiang Tang ,  Ziran Zhao ,  Zhe Zhang

    IPC分类号： H05G1/10 ,  A61B6/03 ,  G01N23/04

    CPC分类号： H05G1/10 ,  A61B6/032 ,  A61B6/40 ,  A61B6/4064 ,  G01N23/046 ,  G01N2223/308 ,  G01N2223/419 ,  H01J35/06 ,  H01J35/08 ,  H01J2235/086

    摘要： CT devices and methods thereof are disclosed. The CT device comprises a circular electron beam emission array including a plurality of electron beam emission units that are distributed uniformly along a circle, wherein each electron beam emission unit emits electron beams that are substantially parallel to an axis of the circular electron beam emission array in sequence under the control of a control signal; a circular reflection target which is disposed to be coaxial with the circular electron beam emission array, wherein the electron beams bombard the circular reflection target to generate X-rays that intersect the axis of the circular electron beam emission array; and a circular detector array which is disposed to be coaxial with the circular reflection target and configured to include a plurality of detection units which receive the X-rays after they have passed through an object to be detected.

    摘要翻译： 公开了CT装置及其方法。 CT装置包括圆形电子束发射阵列，其包括沿着圆均匀分布的多个电子束发射单元，其中每个电子束发射单元发射基本上平行于圆形电子束发射阵列的轴的电子束， 控制信号控制下的序列; 设置为与圆形电子束发射阵列同轴的圆形反射目标，其中电子束轰击圆形反射目标以产生与圆形电子束发射阵列的轴相交的X射线; 以及圆形检测器阵列，其设置成与圆形反射目标同轴并且被配置为包括多个检测单元，其在它们已经通过待检测物体之后接收X射线。