公开(公告)号：US11925183B2

公开(公告)日：2024-03-12

申请号：US17661257

申请日：2022-04-28

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang Chen ,  Li Zhang ,  Qingping Huang ,  Yong Zhou ,  Hui Ding ,  Chao Ji

IPC: G01N23/046 ,  A22B5/00 ,  G01N23/083 ,  G01N23/18 ,  G01N33/12

CPC classification number: A22B5/007 ,  G01N23/046 ,  G01N23/083 ,  G01N23/18 ,  G01N33/12 ,  G01N2223/1016 ,  G01N2223/204 ,  G01N2223/30 ,  G01N2223/3307 ,  G01N2223/3308 ,  G01N2223/419 ,  G01N2223/5015 ,  G01N2223/618 ,  G01N2223/643

Abstract: The present disclosure relates to a static CT detection device, including: a shielding body, formed with a detection channel through which an object under detection can pass; a ray source, emitting rays for detecting the object under detection when the object under detection passes through the detection channel; and a detector, for acquiring the rays emitted by the ray source and having passed through the detection channel, wherein the shielding body is formed with an opening portion, and the opening portion extends from an inlet of the detection channel to an outlet of the detection channel.

公开(公告)号：US10935691B2

公开(公告)日：2021-03-02

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: G01V5/00 ,  G01N23/046

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：US10769821B2

公开(公告)日：2020-09-08

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: G06T5/20 ,  G06T11/00 ,  G06T5/00 ,  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：US10739282B2

公开(公告)日：2020-08-11

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 ,  G01V5/00

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：US10436932B2

公开(公告)日：2019-10-08

申请号：US15279207

申请日：2016-09-28

Applicant: NUCTECH COMPANY LIMITED ,  CINTS CO. LTD.

Inventor： Qitian Miao ,  Zhiqiang Chen ,  Li Zhang ,  Yunda Sun ,  Ming Huang ,  Qingping Huang ,  Ming Hu ,  Lei Lei ,  Jie Xia

IPC: G01N23/046 ,  G01V5/00

Abstract: The present disclosure discloses an inspection system for quarantine and a method thereof. The CT technology is applied to the field of quarantine supervision, overcoming a problem of objects in an image of a single-view or a multi-view X-ray machine being overlapped, as well as a problem of organics including contrabands in a conventional CT image being not highlighted, not elaborated, and having bad contrast. Accuracy and efficiency of inspecting an object by human operator for quarantine inspection can be considerably improved, which is of a high application value.

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：US10295481B2

公开(公告)日：2019-05-21

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: G01N23/20 ,  G01N23/00 ,  G01N23/046 ,  G01N23/083 ,  G01N23/207 ,  G21K1/02 ,  G01V5/00

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.

公开(公告)号：US10267752B2

公开(公告)日：2019-04-23

申请号：US15328437

申请日：2015-11-02

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Li Zhang ,  Zhiqiang Chen ,  Xiaolei Jiang ,  Xiaohua Zhu ,  Xin Jin

IPC: G01N23/04 ,  G01N23/046

Abstract: The present disclosure relates to X-ray imaging systems and methods. An exemplary system may comprise a distributed X-ray source arrangement, a fixed grating module, an X-ray detecting device, and a computer workstation. In one illustrative implementation, X-ray sources of the distributed incoherent X-ray source arrangement may sequentially generate and emit X-rays to an object to be detected. Further, for each exposure, the X-ray detecting device may receive the X-rays, wherein after a series of stepping exposures and corresponding data acquisitions, at each pixel of the X-ray detecting device, X-ray intensities are represented as an intensity curve; the intensity curve may be compared to an intensity curve in the absence of the object to be detected, and a pixel value at each pixel may be obtained from a variation of the intensity curves; and image information of the object to be detected may be obtained according to such pixel values.

公开(公告)号：US10007022B2

公开(公告)日：2018-06-26

申请号：US15709350

申请日：2017-09-19

Applicant: NUCTECH COMPANY LIMITED

Inventor： Chunguang Zong ,  Ying Li ,  Hejun Zhou ,  Jianmin Li ,  Yuanjing Li ,  Yulan Li ,  Li Zhang ,  Zhiqiang Chen

IPC: G01F23/00 ,  G01V5/00

CPC classification number: G01V5/0066 ,  G01V5/0016 ,  G01V5/0025

Abstract: A ray inspection system used to be mounted in a container yard to inspect an object within a container is provided. The ray inspection system includes: a ray generator device configured to emit a ray, a ray receiving device configured to receive the ray, and at least one chamber for receiving the ray generator device and the ray receiving device therein. Each of the at least one chamber is configured to be a standard container or a chamber which has a same shape, a same size and a same structure as a standard container such that the ray inspection system is adapted to be stacked in the container yard.

公开(公告)号：US09784883B2

公开(公告)日：2017-10-10

申请号：US14577069

申请日：2014-12-19

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang Chen ,  Li Zhang ,  Qingping Huang ,  Yunda Sun ,  Xin Jin ,  Tao Yang ,  Le Shen ,  Ji Zhao

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

CPC classification number: G01V5/0041 ,  G01N23/046 ,  G01T1/2985 ,  G01V5/005

Abstract: Multi-spectral static CT apparatuses are disclosed. The apparatus includes a ray source in a form of multiple distributed spots, multiple columns of detectors, a data acquisition device, an article carrying and control device, and a multi-spectral projection data processing device. An object of the present disclosure is to combine static CT scanning technology with multi-spectral analysis technology. It has an advantage of a static CT system, such as high scanning speed, simple mechanic structure, and/or cost reduction due to omission of slip ring. It also can perform identification of material in an article, and can be widely applied in occasions such as safety inspection, and smuggling suppression at customs.