公开(公告)号：US20210025836A1

公开(公告)日：2021-01-28

申请号：US16935415

申请日：2020-07-22

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Zhi ZENG ,  Xingyu PAN ,  Xuewu WANG ,  Junli LI ,  Ming ZENG ,  Jianmin LI ,  Ziran ZHAO ,  Jianping CHENG ,  Hao MA ,  Hui ZHANG ,  Hao YU ,  Bicheng LIU

IPC: G01N23/201 ,  G01N23/02 ,  G06K9/62

Abstract: The present disclosure provides a substance identification device and a substance identification method. The substance identification device comprises: a classifier establishing unit configured to establish a classifier based on scattering density values reconstructed for a plurality of known sample materials, wherein the classifier comprises a plurality of feature regions corresponding to a plurality of characteristic parameters for the plurality of known sample materials, respectively; and an identification unit for a material to be tested, configured to match the characteristic parameter of the material to be tested with the classifier, and to identify a type of the material to be tested by obtaining a feature region corresponding to the characteristic parameter of the material to be tested.

公开(公告)号：US20200309987A1

公开(公告)日：2020-10-01

申请号：US16314093

申请日：2017-09-12

Applicant: Nuctech Company Limited

Inventor： Guangming XU ,  Bicheng LIU ,  Ziran ZHAO ,  Jianping GU ,  Qiang LI ,  Lan ZHANG

IPC: G01V5/00 ,  G01N23/087 ,  G01R23/18

Abstract: The present disclosure discloses a method of substance identification of an item to be inspected using a multi-energy-spectrum X-ray imaging system, the method comprising: acquiring a transparency related vector consisting of transparency values of the item to be inspected in N energy regions, wherein N is greater than 2; calculating distances between the transparency related vector and transparency related vectors stored in the system consisting of N transparency mean values of multiple kinds of items with multiple thicknesses in the N energy regions; and identifying the item to be inspected as the item corresponding to the minimum distance. The present disclosure is based on a multi-energy-spectrum X-ray imaging system, and proposes a method of substance identification by analyzing the multi-energy-spectrum substance identification issue.

公开(公告)号：US20170329038A1

公开(公告)日：2017-11-16

申请号：US15411348

申请日：2017-01-20

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Kejun KANG ,  Zhiqiang CHEN ,  Yuanjing LI ,  Ziran ZHAO ,  Junli LI ,  Xuewu WANG ,  Yaohong LIU ,  Zhi ZENG ,  Jianping GU ,  Song LIANG ,  Bicheng LIU ,  Guangming XU ,  Yongqiang WANG

IPC: G01V5/00

CPC classification number: G01V5/0016 ,  G01N2223/205 ,  G01T1/167 ,  G01T5/002 ,  G01T5/02 ,  G01V5/0025 ,  G01V5/0075 ,  G01V5/0091 ,  G06K9/6267

Abstract: The present application relates to a method, apparatus and system for inspecting an object based on a cosmic ray, pertaining to the technical field of radiometric imaging and safety inspection. The method includes: recording a movement trajectory of an inspected object by using a monitoring device; acquiring information of charged particles in the cosmic ray by using a position-sensitive detector, the information of charged particles comprising trajectory information of the charged particles; performing position coincidence for the movement trajectory and the trajectory information to determine the object; performing trajectory remodeling for the charged particles according to the information of charged particles; and identifying a material inside the moving object according to the trajectory remodeling. According to the present disclosure, pedestrians who are walking and moving are inspected by using the cosmic ray, and nuclear materials, drugs and explosive materials and the like carried by human bodies may be detected.

公开(公告)号：US20190317240A1

公开(公告)日：2019-10-17

申请号：US16467140

申请日：2017-08-04

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang CHEN ,  Ziran ZHAO ,  Yaohong LIU ,  Jianping GU ,  Qian YI ,  Bicheng LIU ,  Guangming XU

IPC: G01V5/00 ,  G01N23/046

Abstract: The present disclosure provides a spiral Computed Tomography (CT) device and a three-dimensional image reconstruction method. The spiral CT device includes: an inspection station configured to carry an object to be inspected, the inspection station defining an inspection space which is located above the inspection station and is used for accommodating the object to be inspected; a rotational supporting apparatus which is disposed around the inspection space in a plane parallel to a first direction and is rotatable around the inspection space in a detection state; a plurality of X-ray sources located on the rotational supporting apparatus and configured to transmit X-rays to pass through the inspection space; and a plurality of X-ray receiving apparatuses in one-to-one correspondence to the plurality of X-ray sources, the plurality of X-ray receiving apparatuses being located on the rotational supporting apparatus opposite to the plurality of X-ray sources respectively and configured to collect the X-rays passing through the inspection space, wherein the plurality of X-ray sources and the plurality of X-ray receiving apparatuses are rotational synchronously with the rotational supporting apparatus.

公开(公告)号：US20190196051A1

公开(公告)日：2019-06-27

申请号：US16232082

申请日：2018-12-26

Applicant: NUCTECH COMPANY LIMITED

Inventor： Qi WANG ,  Bicheng LIU ,  Guangming XU

IPC: G01V5/00 ,  G01N23/04 ,  G06T5/20

CPC classification number: G01V5/0016 ,  G01N23/04 ,  G06T3/4046 ,  G06T5/20 ,  G06T2207/10116

Abstract: The present disclosure provides an image processing method, device, and computer readable storage medium, relating to the field of image processing technology, the method includes: acquiring a first undersampled image to be processed; and reconstructing, according to a mapping relationship between an undersampled image and a normally sampled original image, the first undersampled image to a corresponding first original image, wherein the mapping relationship is obtained by training a machine learning model with a second undersampled image and a normally sampled second original image corresponding to the second undersampled image as training samples.

公开(公告)号：US20180062021A1

公开(公告)日：2018-03-01

申请号：US15625473

申请日：2017-06-16

Applicant: NUCTECH COMPANY LIMITED

Inventor： Lan ZHANG ,  Yingshuai DU ,  Bo LI ,  Zonggui WU ,  Jun LI ,  Xuepeng CAO ,  Haifan HU ,  Jianping GU ,  Guangming XU ,  Bicheng LIU

IPC: H01L31/118 ,  G01T1/02 ,  H01L31/0296 ,  H01L31/028 ,  H01L31/032 ,  H01L31/0304 ,  H01L31/0224 ,  H01L27/144

CPC classification number: H01L31/118 ,  G01T1/026 ,  G01T1/241 ,  H01L27/1446 ,  H01L31/022408 ,  H01L31/022416 ,  H01L31/028 ,  H01L31/0296 ,  H01L31/02966 ,  H01L31/0304 ,  H01L31/032

Abstract: There is provided a semiconductor detector. According to an embodiment, the semiconductor detector may include a semiconductor detection material including a first side and a second side opposite to each other. One of the first side and the second side is a ray incident side that receives incident rays. The detector may further include a plurality of pixel cathodes disposed on the first side and a plurality of pixel anodes disposed on the second side. The pixel anodes and the pixel cathodes correspond to each other one by one. The detector may further include a barrier electrode disposed on a periphery of respective one of the pixel cathodes or pixel anodes on the ray incident side. According to the embodiment of the present disclosure, it is possible to effectively suppress charge sharing between the pixels and thus to improve an imaging resolution of the detector.

公开(公告)号：US20170329039A1

公开(公告)日：2017-11-16

申请号：US15411359

申请日：2017-01-20

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Kejun KANG ,  Jianping CHENG ,  Zhiqiang CHEN ,  Ziran ZHAO ,  Junli LI ,  Xuewu WANG ,  Zhi ZENG ,  Qingjun ZHANG ,  Jianping GU ,  Xi YI ,  Bicheng LIU ,  Guangming XU ,  Yongqiang WANG

IPC: G01V5/00

CPC classification number: G01V5/0075 ,  G01V5/0016 ,  G01V5/0091

Abstract: The present disclosure relates to a method, a device and a system for inspecting a moving object based on cosmic rays, pertaining to the field of radiation imaging and safety inspection techniques. The method includes: detecting whether a speed of the inspected moving object is within a preset range; recording a motion trajectory of the moving object with a monitoring device; acquiring information about charged particles in the cosmic rays with a position sensitive detector, the information about charged particles including track information of the charged particles; determining the moving object by matching positions of the motion trajectory and the track information; reconstructing the track of the charged particles according to the information about the charged particles; and recognizing the material inside the moving object based on the track reconstruction.