公开(公告)号：US20200012010A1

公开(公告)日：2020-01-09

申请号：US16491891

申请日：2017-12-20

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Zhiqiang CHEN ,  Yuanjing LI ,  Ziran ZHAO ,  Wanlong WU ,  Ming RUAN ,  Yingkang JIN ,  Guangwei DING ,  Zongjun SHEN ,  Jiajiang ZHAO

IPC: G01V5/00

Abstract: A human body security inspection apparatus, a method of operating the same, and an associated filter device are disclosed. The human body security inspection apparatus includes a radiation beam exit configured for emitting a radiation beam; a beam guiding box configured for guiding the radiation beam; and a filter device configured between the radiation beam exit and the beam guiding box. The filter device includes a housing and a filter cage having a central axis. The filter cage is formed by arranging two or more pairs of filtering sheets, which are made of different materials and/or have different thicknesses, in an encircling way. The filter cage is rotatable about its central axis such that at least one pair of filtering sheets is capable of filtering the radiation beam to adjust an outputted dosage of the radiation beam of the human body security inspection apparatus.

公开(公告)号：US20190204242A1

公开(公告)日：2019-07-04

申请号：US16234621

申请日：2018-12-28

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Xiulin NI ,  Jianmin LI ,  Haitian TAN ,  Yulan LI ,  Weifeng YU ,  Yuanjing LI ,  Hejun ZHOU ,  Zhiqiang CHEN ,  Chunguang ZONG ,  Li ZHANG

IPC: G01N23/046 ,  G01V5/00

CPC classification number: G01N23/046 ,  G01N2223/401 ,  G01V5/005

Abstract: The present disclosure relates to the technical field of CT detection, in particular to a CT inspection system and a CT imaging method. The CT inspection system provided by the present disclosure includes a scanning device and an imaging device, wherein the scanning device having a radioactive source device and a detection device is configured to rotate at a non-uniform speed in at least partial process of scanning an object to be detected; and the imaging device generates a CT image based on effective detection data, wherein the effective detection data refer to data acquired each time the detection device rotates by a preset angle. In the present disclosure, the imaging device of the CT inspection system generates a CT image based on data acquired each time the detection device rotates by a preset angle, which, compared with traditional image collection solutions, can effectively reduce image deformation and improve accuracy of detection results.

公开(公告)号：US20190193017A1

公开(公告)日：2019-06-27

申请号：US16232050

申请日：2018-12-26

Applicant: NUCTECH COMPANY LIMITED ,  TSINGHUA UNIVERSITY

Inventor： Qingjun ZHANG ,  Yuanjing LI ,  Zhiqiang CHEN ,  Ziran ZHAO ,  Yinong LIU ,  Yaohong LIU ,  Lili YAN ,  Ge LI ,  Qiufeng MA ,  Nan BAI

IPC: B01D53/04 ,  B01D53/02 ,  G01N27/62 ,  G01N30/26

CPC classification number: B01D53/0446 ,  B01D53/025 ,  B01D53/0438 ,  B01D2257/80 ,  B01D2259/40003 ,  B01D2259/40086 ,  B01D2259/40096 ,  G01N27/622 ,  G01N30/26 ,  G01N2030/025

Abstract: The present disclosure relates to a gas purification apparatus and a trace substance detection device. The gas purification apparatus includes a first purification component, a second purification component and a switching component, wherein the switching component can be switched between a first state and a second state, the first purification component and a component to be purified form a gas purification loop in the first state, and the second purification component can provide a regeneration gas for the first purification component in the second state, so that water vapor and impurities in the first purification component are discharged to outside. In the gas purification apparatus, the filtered air is used as the regeneration gas to prevent secondary pollution in a recycling process of the purificant; furthermore, by means of the state switching function of the switching component, the mutual interference between the two working states of purification and regeneration can be prevented, and all the above advantages can improve the reliability of the recycling of the purificant, thereby optimizing the performance and the service life of the gas purification apparatus.

公开(公告)号：US20190035117A1

公开(公告)日：2019-01-31

申请号：US16045383

申请日：2018-07-25

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Yuxiang XING ,  Li ZHANG ,  Jianmin LI ,  Zhiqiang CHEN ,  Jianping GU

IPC: G06T11/00 ,  G06T5/00 ,  G06T5/20 ,  G06T3/40 ,  G06N3/04

Abstract: A method and device for reconstructing a CT image and a storage medium are disclosed. CT scanning is performed on an object to be inspected to obtain projection data on a first scale. Projection data on a plurality of other scales is generated from the projection data on the first scale. Projection data on each scale is processed on the corresponding scale by using a first convolutional neural network to obtain processed projection data, and a back-projection operation is performed on the processed projection data to obtain a CT image on the corresponding scale. CT images on the plurality of scales are fused to obtain a reconstructed image of the object to be inspected.

公开(公告)号：US20190025447A1

公开(公告)日：2019-01-24

申请号：US16137547

申请日：2018-09-21

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Sen WANG ,  Xiaofei XU ,  Yuanjing LI ,  Xin JIN

IPC: G01T7/00 ,  G01T1/16

Abstract: The present disclosure relates to a data processing method and device. The data processing method comprises steps of: performing detector response calibration based on a detector response obtained by an incidence of rays with known energy into a detector to obtain a detector response model; obtaining a photon counting model of the detector between incident energy spectrum data of the detector and detected energy spectrum data of the detector based on the detector response model; and performing a deconvolution operation on counts of photons in respective energy regions in the detected energy spectrum data of the detector based on the photon counting model of the detector, to obtain real counts of photons in respective energy regions in the incident energy spectrum data of the detector.

公开(公告)号：US20170308766A1

公开(公告)日：2017-10-26

申请号：US15129389

申请日：2015-12-23

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Ziran ZHAO ,  Yaohong LIU ,  Duokun ZHANG ,  Jianping GU ,  Qiang LI ,  Jian ZHANG

IPC: G06K9/32 ,  G01N23/04 ,  G01V5/00

CPC classification number: G06K9/3241 ,  G01N23/046 ,  G01V5/0016 ,  G01V5/005

Abstract: An inspection method and system for inspecting whether there is any liquor in goods is provided. The method includes: acquiring a radiation image of goods being inspected; processing on the radiation image to obtain an ROI; inspecting on the ROI using a liquor goods inspection model to determine if the ROI of the radiation image contains liquor goods. The above solution performs liquor inspection on scanned images of goods, especially containers, so as to intelligently assist the image inspectors.

公开(公告)号：US20170276823A1

公开(公告)日：2017-09-28

申请号：US15300709

申请日：2015-12-14

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Shuo WANG ,  Yunda SUN ,  Qingping HUANG ,  Zhi TANG

IPC: G01V5/00

CPC classification number: G06T11/20 ,  G01V5/0008 ,  G01V5/005 ,  G06K9/46 ,  G06K9/52 ,  G06K9/6218 ,  G06K2009/4666 ,  G06T7/50 ,  G06T7/60 ,  G06T7/75 ,  G06T15/005 ,  G06T15/20 ,  G06T19/20

Abstract: Disclosed is a method for positioning a target in a three-dimensional CT image and a CT system for security inspection. The method includes: displaying a three-dimensional CT image; receiving a selection by a user of at least one area of the three-dimensional CT image at a viewing angle; generating at least one set of three-dimensional objects in a depth direction based on the selection; and determining a target object from the set. With the above technical solutions, the user may be facilitated in marking a suspected object in a CT image in a quick manner.

公开(公告)号：US20170234811A1

公开(公告)日：2017-08-17

申请号：US15328881

申请日：2015-10-28

Applicant: Nuctech Company Limited

Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Xiaolei JIANG ,  Xiaohua ZHU ,  Xin JIN

IPC: G01N23/04 ,  G01N23/087

CPC classification number: G01N23/046 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4241 ,  A61B6/4291 ,  A61B6/463 ,  A61B6/482 ,  A61B6/484 ,  G01N23/087 ,  G01N2223/401 ,  G01N2223/408 ,  G01N2223/419 ,  G01N2223/605

Abstract: The present disclosure relates to a multi-spectrum X-ray grating-based imaging system and imaging method. The multi-spectrum X-ray grating-based imaging system according to the present disclosure comprises an incoherent X-ray source for emitting X-rays to irradiate an object to be detected, a grating module comprising a first absorption grating and a second absorption grating which are disposed in parallel to each other and are sequentially arranged in an X-ray propagation direction, and an energy-resolved detecting device for receiving the X-rays that have passed through the first absorption grating and the second absorption grating. One of the first absorption grating and the second absorption grating performs phase stepping actions within at least one period; during each phase stepping action, the incoherent X-ray source emits X-rays to irradiate the object to be detected; the energy-resolved detecting device receives the X-rays and performs spectrum identification of the X-rays; and after a series of phase stepping actions and data acquisitions over a period, at each pixel on the energy-resolved detecting device, X-ray intensities in each energy range are represented as an intensity curve.

公开(公告)号：US20170185842A1

公开(公告)日：2017-06-29

申请号：US15278502

申请日：2016-09-28

Applicant: Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Jin CUI ,  Hong WANG ,  Huabin TAN ,  Dongxu JI ,  Wenjing WANG ,  Tingting ZHANG

IPC: G06K9/00 ,  H04N7/18 ,  G06T7/00 ,  H04N19/44 ,  H04N21/2187 ,  H04N21/61 ,  H04N21/845 ,  G01V5/00 ,  G06K9/46

CPC classification number: G06K9/00718 ,  G01V5/0016 ,  G01V5/0041 ,  G06K9/00744 ,  G06K9/00758 ,  G06K9/00765 ,  G06K9/4671 ,  G06K2009/4666 ,  G06T7/11 ,  G06T7/194 ,  G06T2207/10116 ,  H04N7/181 ,  H04N7/183 ,  H04N19/29 ,  H04N19/44 ,  H04N21/2187 ,  H04N21/6125 ,  H04N21/845

Abstract: The present disclosure relates to a method, a system and a device for security inspection, pertaining to the field of security inspection. The method includes: before a baggage enters a security inspection machine and/or after the baggage leaves the security inspection machine, acquiring information about the baggage and information about a subject person; while the baggage is inside the security inspection machine to be scanned, acquiring a scanned image of the baggage; and correlating the information about the baggage, the scanned image of the baggage and the information about the subject person in a storage system, wherein acquiring information about the baggage and information about a subject person includes analyzing a video.

公开(公告)号：US20170176352A1

公开(公告)日：2017-06-22

申请号：US15262894

申请日：2016-09-12

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Tianyi YANG DAI ,  Ji ZHAO ,  Xin JIN ,  Ming CHANG

IPC: G01N23/04 ,  G01N23/207 ,  G21K1/02 ,  G01N23/083

CPC classification number: G01N23/046 ,  G01N23/083 ,  G01N23/20083 ,  G01N23/207 ,  G01N2223/045 ,  G01N2223/056 ,  G01N2223/316 ,  G01N2223/643 ,  G01V5/0025 ,  G01V5/005 ,  G21K1/02

Abstract: The present disclosure relates to detection systems and methods. One illustrative detection system may include a distributed radiation source having a plurality of radiation source focus points, which irradiate an object under detection, wherein the plurality of radiation source focus points are divided into a certain number of groups, and a primary collimator that limits rays of each of the radiation source focus points such that the rays emit into an XRD detection device. An XRD detection device may include a plurality of XRD detectors that are divided into the same number of groups as the radiation source focus points, wherein XRD detectors in a same group are arranged to be separated by XRD detectors in other groups, and rays of each of the radiation source focus points are received by XRD detectors having the same group number as the group number of the radiation source focus point.