公开(公告)号：US20230350053A1

公开(公告)日：2023-11-02

申请号：US18139411

申请日：2023-04-26

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Ao ZHENG ,  Ji ZHAO ,  Hu TANG ,  Lei LEI ,  Shuo WANG ,  Yunda SUN

IPC: G01S13/88 ,  G06T5/50 ,  G06T7/62 ,  G06T7/70 ,  G06V10/74 ,  G06V20/70

CPC classification number: G01S13/887 ,  G06T5/50 ,  G06T7/62 ,  G06T7/70 ,  G06V10/761 ,  G06V20/70 ,  G06V2201/07 ,  G06T2207/20081 ,  G06T2207/20104 ,  G06T2207/20221

Abstract: Provided are a method and an apparatus of training a radiation image recognition model online and a method and an apparatus of recognizing a radiation image. Preset data is pre-stored in a radiation inspection system, and the preset data includes a first radiation image. The method of training radiation image recognition model online includes: collecting a second radiation image at the radiation inspection site; labeling the second radiation image online to form on-site collected data having a second labeling information, wherein the second labeling information is an incomplete labeling information of the second radiation image, and the second labeling information is used to indicate at least one of objects of interest in the second radiation image; synthesizing the preset data and the on-site collected data online to form a training data set; and training the radiation image recognition model online using the training data set.

公开(公告)号：US20220091051A1

公开(公告)日：2022-03-24

申请号：US17471725

申请日：2021-09-10

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Xiaofei XU ,  Le SHEN ,  Ming CHANG ,  Hu TANG ,  Xin JIN ,  Yunda SUN

IPC: G01N23/046 ,  G01N23/083

Abstract: A multi-channel static CT device is provided, and the multi-channel static CT device includes: a scanning channel including a plurality of scanning sub-channels; a distributed X-ray source including a plurality of ray emission points arranged around the scanning channel; and a detector module including a plurality of detectors arranged around the scanning channel, wherein the plurality of detectors are arranged corresponding to the plurality of ray emission points.

公开(公告)号：US20190204243A1

公开(公告)日：2019-07-04

申请号：US16234625

申请日：2018-12-28

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Kejun KANG ,  Jianmin LI ,  Xiulin NI ,  Yulan LI ,  Yuanjing LI ,  Zhiqiang CHEN ,  Li ZHANG ,  Liang LI ,  Xiang ZOU ,  Weifeng YU ,  Hejun ZHOU ,  Chunguang ZONG

IPC: G01N23/046

CPC classification number: G01N23/046 ,  G01N2223/33 ,  G01V5/005

Abstract: The present disclosure relates to the technical field of CT detection, and in particular to a CT inspection system and a CT imaging method. The CT inspection system provided by the present disclosure comprises a radioactive source device, a detection device, a rotation monitoring device and an imaging device, wherein the detection device obtains detection data at a frequency that is N times a beam emitting frequency of the radioactive source device; the rotation monitoring device detects a rotation angle of the detection device and transmits a signal to the imaging device each time the detection device rotates by a preset angle; the imaging device determines a rotational position of the detection device each time the radioactive source device emits a beam according to the signal transmitted by the rotation monitoring device and the detection data of the detection device.

公开(公告)号：US20190156139A1

公开(公告)日：2019-05-23

申请号：US16255738

申请日：2019-01-23

Applicant: NUCTECH COMPANY LIMITED

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

IPC: G06K9/32 ,  G01N23/046 ,  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：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.

公开(公告)号：US20190064082A1

公开(公告)日：2019-02-28

申请号：US16168850

申请日：2018-10-24

Applicant: Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Mingzhi HONG ,  Yong ZHOU ,  Yihong LIU

IPC: G01N23/10 ,  G21F3/00 ,  G21F1/08

Abstract: A device comprises: at least two lead curtains; a supporting assembly comprising a working area and a standby area; a first transmission assembly to drive the lead curtains to move in a conveying channel; and a second transmission assembly to transfer the lead curtains between the standby area and the working area, wherein the second transmission assembly transfers the lead curtains from the standby area to the working area, so that the lead curtains fall into a starting point of the conveying channel and are located behind an article to be detected; the first transmission assembly drives the lead curtains to move with the article to be detected in front and drive the lead curtains to move from the starting point of the working area to a starting point of the standby area; and the second transmission assembly drives the lead curtains to enter and move in the standby area.

公开(公告)号：US20190056338A1

公开(公告)日：2019-02-21

申请号：US16045243

申请日：2018-07-25

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Liang LI ,  Zhiqiang CHEN ,  Li ZHANG ,  Ziran ZHAO ,  Yuxiang XING ,  Siyuan ZHANG

IPC: G01N23/2206 ,  G01N23/046 ,  G01N23/223 ,  A61B6/03 ,  A61B6/06 ,  A61B6/10 ,  A61B6/00

Abstract: The present disclosure discloses a ray transmission and fluorescence CT imaging system and method. The system comprises: a ray source configured to emit a beam of rays; a rotational scanning device configured to perform rotational CT scanning on an object to be inspected; a transmission CT detector configured to receive the beam of rays which has passed through the object; a fluorescence CT detector configured to receive fluorescent photons excited by irradiation of the beam of rays on the object; a data acquisition unit configured to acquire a transmission data signal and a fluorescence data signal respectively; and a control and data processing unit configured to control the ray source to emit the beam of rays, control the rotational scanning device to perform the rotational CT scanning, and obtain a transmission CT image and a fluorescence CT image simultaneously based on the transmission data signal and the fluorescence data signal.

公开(公告)号：US20190035116A1

公开(公告)日：2019-01-31

申请号：US16045303

申请日：2018-07-25

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

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

IPC: G06T11/00 ,  G06N5/04 ,  G06N3/08 ,  G06N3/04 ,  G06T5/00

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. The projection data is processed using a first convolutional neural network to obtain processed projection data. The first convolutional neural network comprises a plurality of convolutional layers. A back-projection operation is performed on the processed projection data to obtain a reconstructed image.

公开(公告)号：US20180328866A1

公开(公告)日：2018-11-15

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

CPC classification number: G01N23/046 ,  G01V5/005

Abstract: The present disclosure provides a low-angle self-swinging type computed tomography (CT) apparatus, which is provided with an X-ray accelerator and a plurality of rows of detectors and is configured to include 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 objected to be inspected passes through the slip ring, a three dimension CT image of the object is displayed, thereby achieving accurate inspection for large-scale objects, such as van containers.

公开(公告)号：US20180173967A1

公开(公告)日：2018-06-21

申请号：US15822920

申请日：2017-11-27

Applicant: Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Gang PENG ,  Zhisheng DAI ,  Yunda SUN ,  Dong LI

IPC: G06K9/00 ,  G06K9/78 ,  G06K9/46 ,  G06T7/00

Abstract: The present disclosure relates to a security check system and method. The present disclosure provides a security check system for identifying objects of interest from multiple objects, comprising: an object-of-interest determining device for determining whether an object is an object of interest; an image mark applying device for acquiring images related to selected objects among the multiple objects and recording image marks of the selected objects; and a mark detecting device for detecting the image marks, wherein the security check system is configured to identify whether the object is the object of interest based on the detection of the mark detecting device and outputs a warning accordingly.