公开(公告)号：US20190192090A1

公开(公告)日：2019-06-27

申请号：US16232072

申请日：2018-12-26

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Liang Li ,  Zhiqiang Chen ,  Kejun Kang ,  Ziran Zhao ,  Li Zhang ,  Yuxiang Xing ,  Tiao Zhao ,  Jianmin Li ,  Bicheng Liu ,  Qian Yi

IPC: A61B6/03 ,  G06T11/00 ,  A61B6/00

Abstract: The present disclosure provides a decomposition method based on basis material combination. In the present disclosure, a scanned object is divided into a plurality of regions, the basis material combinations used in each of the divided regions are different each other, and the scanned object is re-divided according to the re-determined equivalent atomic number of its each point until the change on decomposition coefficient meets certain conditions. Thereby, a decomposition method based on dynamic basis material combinations is realized, which reduces a decomposition error caused by improper selection of the basis material combination and improves the accuracy of the decomposition and substance identification of the multi-energy CT.

公开(公告)号：US09915751B2

公开(公告)日：2018-03-13

申请号：US14769308

申请日：2014-07-22

Applicant: Nuctech Company Limited ,  TSINGHUA UNIVERSITY

Inventor： Kejun Kang ,  Jianmin Li ,  Yuanjing Li ,  Yulan Li ,  Jingyu Gu ,  Weizhen Wang ,  Quanwei Song ,  Qingjun Zhang ,  Shenjin Ming ,  Xuewu Wang ,  Hui Gong ,  Tao Xue

IPC: G01V5/00

CPC classification number: G01V5/0016 ,  G01V5/0075

Abstract: The present application discloses a detector module, which is arranged on a detector arm, comprising one or a plurality of detector units arranged in a scattered configuration, wherein each of the detector units in the detector module is installed aiming at a beam center of a ray source, thus improving imaging quality and reducing the size of a detector frame drastically.

公开(公告)号：US09780426B2

公开(公告)日：2017-10-03

申请号：US15281026

申请日：2016-09-29

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Kejun Kang ,  Jiaru Shi ,  Ping Wang ,  Chuanxiang Tang ,  Huaibi Chen ,  Yaohong Liu ,  Xinshui Yan ,  Wenhui Huang

IPC: H01P1/18 ,  H05H7/00 ,  H01P5/02 ,  H05H5/03 ,  H05H5/06

CPC classification number: H01P1/182 ,  H01P1/067 ,  H01P5/02 ,  H01P5/082 ,  H05H5/03 ,  H05H5/06

Abstract: The present disclosure relates to a phase shifter, an accelerator, and an operating method therefor. The phase shifter comprises a rotating part having a first hollow structure, the first hollow structure having a first cavity, a distance between a circumference of the cross section of the first cavity and a rotation center of the rotating part changing periodically and continuously in a peripheral direction, such that when the rotatory part rotates, a phase shift occurs between two adjacent microwave pulses at an outlet of the phase shifter. The operating method comprises transmitting a microwave pulse within the accelerator at a repetitive frequency v Hertz; the driving devices drives the rotating part to rotate at a rotation speed of n RPM, wherein n=15v*m, m is an odd number, 1, 3, 5 . . . , such that when transmitting a microwave pulse each time, the long axis of the oval cross section of the first cavity of the rotatory part is rotated to a horizontal or vertical state.

公开(公告)号：US20170187085A1

公开(公告)日：2017-06-29

申请号：US15281026

申请日：2016-09-29

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Kejun Kang ,  Jiaru Shi ,  Ping Wang ,  Chuanxiang Tang ,  Huaibi Chen ,  Yaohong Liu ,  Xinshui Yan ,  Wenhui Huang

IPC: H01P1/18 ,  H05H5/03 ,  H05H5/06 ,  H01P5/02

CPC classification number: H01P1/182 ,  H01P1/067 ,  H01P5/02 ,  H01P5/082 ,  H05H5/03 ,  H05H5/06

Abstract: The present disclosure relates to a phase shifter, an accelerator, and an operating method therefor. The phase shifter comprises a rotating part having a first hollow structure, the first hollow structure having a first cavity, a distance between a circumference of the cross section of the first cavity and a rotation center of the rotating part changing periodically and continuously in a peripheral direction, such that when the rotatory part rotates, a phase shift occurs between two adjacent microwave pulses at an outlet of the phase shifter. The operating method comprises transmitting a microwave pulse within the accelerator at a repetitive frequency v Hertz; the driving devices drives the rotating part to rotate at a rotation speed of n RPM, wherein n=15v*m, m is an odd number, 1, 3, 5 . . . , such that when transmitting a microwave pulse each time, the long axis of the oval cross section of the first cavity of the rotatory part is rotated to a horizontal or vertical state.

公开(公告)号：US09685247B2

公开(公告)日：2017-06-20

申请号：US14459408

申请日：2014-08-14

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Kejun Kang ,  Yuanjing Li ,  Ying Li ,  Jianmin Li ,  Junli Li ,  Yanli Deng

IPC: G21F3/00 ,  G01V5/00 ,  G21F1/02 ,  G21F1/04

CPC classification number: G21F3/00 ,  G01V5/0016 ,  G21F1/023 ,  G21F1/042

Abstract: A radiation protection device is disclosed in the embodiment of the present invention. The radiation protection device is used for a system which is configured to perform safety inspection of a cargo or a vehicle by a ray. The radiation protection device comprising: at least one container, and a radiation protection part disposed within the container. The radiation protection material may comprise at least one of concrete, sandstone, and water, or the radiation protection part may comprise a steel-lead protection wall or a concrete protection wall. With the radiation protection device according to the embodiment of the present invention, after the container is transported to the site, it can be directly put in place to be capable of shielding rays without needing operation or with only simple operation. The amount of on-site work, construction time, and construction cost are low.

公开(公告)号：US09615438B2

公开(公告)日：2017-04-04

申请号：US14758484

申请日：2013-11-21

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Kejun Kang ,  Chuanxiang Tang ,  Ziran Zhao ,  Zhe Zhang

IPC: H01J35/04 ,  H05G1/10 ,  H01J35/06 ,  H01J35/08 ,  G01N23/04 ,  A61B6/03 ,  A61B6/00

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

Abstract: 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.

公开(公告)号：US11022569B2

公开(公告)日：2021-06-01

申请号：US16029896

申请日：2018-07-09

Applicant: Nuctech Company Limited

Inventor： Kejun Kang ,  Zhiqiang Chen ,  Yuanjing Li ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jianping Gu ,  Liang Li ,  Yuxiang Xing

IPC: G01N23/046 ,  G01V5/00

Abstract: A low-angle self-swinging type computed tomography (CT) device is provided, having an X-ray accelerator and a plurality of rows of detectors and includes a slip ring, such that the slip ring with the accelerator and the detectors thereon is capable of performing a single-pendulum reciprocating movement while an object to be inspected passes through the slip ring, a three-dimensional CT image of the object is displayed, thereby achieving accurate inspection for large-scale objects, such as van containers.

公开(公告)号：US10984565B2

公开(公告)日：2021-04-20

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

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.

公开(公告)号：US10658088B2

公开(公告)日：2020-05-19

申请号：US15277828

申请日：2016-09-27

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Kejun Kang ,  Ying Li ,  Jianmin Li ,  Yulan Li ,  Guoping Zhu

IPC: G21K1/04 ,  G01V5/00

Abstract: A collimator and an inspection system having the collimator are disclosed. The collimator includes: a collimator body including a first part and a second part; a collimating slit formed between the first part and the second part and having a first end and a second end in a longitudinal direction thereof; and a shielding member which is movable relative to the collimator body such that both a beam divergent angle and an elevation angle of a ray beam propagating through the collimating slit are varied. An inspection system and an inspection method for scanning a vehicle are further disclosed.

公开(公告)号：US20180156741A1

公开(公告)日：2018-06-07

申请号：US15716921

申请日：2017-09-27

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Kejun Kang ,  Jianping Cheng ,  Zhiqiang Chen ,  Ziran Zhao ,  Junli Li ,  Xuewu Wang ,  Zhi Zeng ,  Ming Zeng ,  Yi Wang ,  Qingjun Zhang ,  Jianping Gu ,  Xi Yi ,  Bicheng Liu ,  Guangming Xu ,  Yongqiang Wang

IPC: G01N23/04 ,  G01N23/08 ,  G01N23/20

CPC classification number: G01N23/04 ,  G01N23/046 ,  G01N23/06 ,  G01N23/20008 ,  G01N2223/304 ,  G01N2223/33 ,  G01N2223/401 ,  G01N2223/419 ,  G01N2223/652 ,  G01V5/0016 ,  G01V5/0025 ,  G01V5/0091

Abstract: Inspection devices and inspection methods are disclosed. The inspection method includes: performing X-ray scanning on an object being inspected so as to generate an image of the object being inspected; dividing the image of the object being inspected to determine at least one region of interest; detecting interaction between a cosmic ray and the region of interest to obtain a detection value; calculating a scattering characteristic value and/or an absorption characteristic value of the cosmic ray in the region of interest based on size information of the region of interest and the detection value; and discriminating a material attribute of the region of interest by means of the scattering characteristic value and/or the absorption characteristic value. With the above technical solutions, inspection accuracy and inspection efficiency may be improved.