公开(公告)号：US10339673B2

公开(公告)日：2019-07-02

申请号：US15129455

申请日：2015-12-23

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Liang Li ,  Zhiqiang Chen ,  Kejun Kang ,  Li Zhang ,  Ziran Zhao ,  Yuxiang Xing ,  Yongshun Xiao ,  Jianping Gu ,  Juan Zheng

IPC: G01N23/04 ,  G06T11/00 ,  G06T7/00

Abstract: Disclosed is a dual-energy ray imaging method and system. The method comprises: calculating the mass thicknesses of the materials in the overlapped area of two materials by using a calibrated surface fitting method, and then decomposing a pair of original high-energy and low-energy data for this pixel into two high-low-energy data sets corresponding to the two materials, and finally calculating and acquiring the composition result of different materials for each pixel. The disclosure is especially advantageous in that the problem of error recognition of materials due to the two overlapped materials can be eliminated and the stratified imaging of multiple materials can be achieved, thereby improving the accuracy of the substance recognition and reducing the rate of false positive and false negative which is very important to the applications in the field of security check and anti-smuggling.

公开(公告)号：US10338011B2

公开(公告)日：2019-07-02

申请号：US15263207

申请日：2016-09-12

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Li Zhang ,  Tianyi Yang Dai ,  Qingping Huang ,  Yunda Sun ,  Xin Jin

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

Abstract: The present disclosure relates to multi-modality detection systems and methods. One illustrative multi-modality detection system may include a distributed radiation source configured to irradiate an object under detection, a primary collimator configured to separate rays of the distributed radiation source into two parts, wherein one part is for CT detection and the other part is for XRD detection, a CT detection device configured to perform a CT detection to acquire a CT image of the object under detection, and an XRD detection device configured to perform an XRD detection to acquire an XRD image of the object under detection, wherein the CT detection and the XRD detection are performed simultaneously.

公开(公告)号：US10289699B2

公开(公告)日：2019-05-14

申请号：US15282134

申请日：2016-09-30

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jianping Gu ,  Zheng Hu ,  Qiang Li

IPC: G06K9/00 ,  G06F17/30 ,  G01N23/04 ,  G06T7/00 ,  G06T7/33 ,  G06K9/42 ,  G06K9/62

Abstract: A vehicle inspection method and system are disclosed. In one aspect, the method includes acquiring a transmission image of an inspected vehicle. The method further includes acquiring a transmission image template of a vehicle model corresponding to the model of the inspected vehicle from a database. The method further includes performing registration on the transmission image of the inspected vehicle and the transmission image template. The method further includes determining a difference between a transmission image after the registration and a transmission image template after the registration, to obtain a difference area of the transmission image of the vehicle relative to the transmission image template. The method further includes processing the difference area to determine whether the vehicle carries a suspicious object or not. In some embodiments, this solution can avoid the problems of a detection loophole and a poor effect of manually determining an image in a conventional manner, and is important to assist the security inspection for small vehicles.

公开(公告)号：US10152774B2

公开(公告)日：2018-12-11

申请号：US15217613

申请日：2016-07-22

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Kejun Kang ,  Zhiqiang Chen ,  Yuanjing Li ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jianping Gu ,  Zhiming Wang

IPC: G06K9/00 ,  G06T5/00 ,  G06T7/77 ,  G06T7/44

Abstract: The present disclosure relates to a method and device for estimating a point spread function. In one implementation, a method includes capturing, by a scanning device, an image by scanning a plurality of rectangle blocks which are same sized and closely arranged, wherein the plurality of rectangle blocks are made of different materials and/or have different mass thicknesses, and an incident direction of rays is perpendicular to a scanning direction and a surface of the plurality of rectangle blocks arranged closely during scanning; obtaining line spread functions for two directions along a length side and a width side of each of the rectangle blocks based on the scanned image, and obtaining standard deviation parameters of the line spread functions; and combining the standard deviation parameters for the two directions to obtain a two dimensional Point Spread Function (PSF) parameter so as to estimate the point spread function.

公开(公告)号：US10074166B2

公开(公告)日：2018-09-11

申请号：US14700249

申请日：2015-04-30

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Kejun Kang ,  Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jian Zhang ,  Jianping Gu ,  Qiang Li ,  Duokun Zhang

IPC: G06T7/00 ,  G01N23/10 ,  G01V5/00 ,  G01N23/04 ,  G06K9/46 ,  G06K9/52 ,  G06K9/62

CPC classification number: G06T7/0004 ,  G01N23/04 ,  G01V5/0016 ,  G06K9/4604 ,  G06K9/4642 ,  G06K9/52 ,  G06K9/6215 ,  G06K9/6256 ,  G06K2009/4666

Abstract: The present disclosure discloses a method and system for inspecting cargoes. The method comprises: acquiring a transmission image of the inspected cargoes; processing the transmission image to acquire an interested region; extracting features from the interested region, and determining cargo information of the inspected cargoes according to the extracted features; and providing a proposed treatment suggestion of the cargoes based on the determined cargo information and at least a part of information in a manifest. The above solution can facilitate an image judgment person to accurately judge whether the concerned cargoes are allowed to pass.

公开(公告)号：US09632041B2

公开(公告)日：2017-04-25

申请号：US14494301

申请日：2014-09-23

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Mingliang Li ,  Zhiqiang Chen ,  Yuanjing Li ,  Jianmin Li ,  Li Zhang

IPC: A61B6/02 ,  G01N23/04 ,  A61B6/03 ,  G21K1/02 ,  G01T1/29 ,  A61B6/06

CPC classification number: G01N23/046 ,  A61B6/032 ,  A61B6/035 ,  A61B6/06 ,  G01N2223/3301 ,  G01T1/2985 ,  G21K1/025

Abstract: A straight trajectory CT device can be used in radiation imaging. The device includes: a ray-generating unit that generates a ray within a specific range of field angle; a channel for an object to be inspected though which the object to be inspected passes; a first collimator; and a ray receiving unit provided on both sides of the channel for the object to be inspected. The ray beam is received by the ray receiving unit after penetrating the first collimator and the object to be inspected in order. The ray generating unit is static and the first collimator moves in the same direction as the ray receiving unit. This direction is parallel to the channel for the object to be inspected. The device can complete computed tomography with a minimum of one ray receiving unit, thereby simplifying the structure of the device and reducing its cost.

公开(公告)号：US09551808B2

公开(公告)日：2017-01-24

申请号：US14140105

申请日：2013-12-24

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Jinyu Zhang ,  Hu Tang ,  Zhanjun Duan ,  Li Zhang ,  Ziran Zhao

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

CPC classification number: G01V5/005 ,  G01N23/046 ,  G01N2223/419 ,  G01T1/2985

Abstract: A CT apparatus without a gantry. The CT apparatus includes a scanning passage; a stationary X-ray source arranged around the scanning passage and including a plurality of ray emission focal spots; and a plurality of stationary detector modules arranged around the scanning passage and disposed opposite the X-ray source. At least some of the plurality of detector modules may be arranged substantially in an L shape, a semicircular shape, a U shape, an arc shape, a parabolic shape, or a curve shape when viewed in a plane intersecting the scanning passage. The invention ensures that the stationary gantry type CT system has a small size, and a high data identification accuracy.

Abstract translation: 没有龙门架的CT设备。 CT装置包括扫描通道; 固定的X射线源，设置在扫描通道周围并且包括多个射线发射焦点; 以及多个固定检测器模块，其布置在扫描通道周围并且设置成与X射线源相对。 当在与扫描通道相交的平面中观察时，多个检测器模块中的至少一些可以基本上布置成L形，半圆形，U形，弧形，抛物线形或曲线形状。 本发明确保了固定式龙门式CT系统体积小，数据识别精度高。

公开(公告)号：US09513235B2

公开(公告)日：2016-12-06

申请号：US14337209

申请日：2014-07-22

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Yuxiang Xing ,  Le Shen ,  Li Zhang ,  Zhiqiang Chen ,  Liang Li

IPC: G01N23/04 ,  G06T11/00

CPC classification number: G01N23/046 ,  G06T11/006 ,  G06T2207/10081 ,  G06T2207/20182 ,  G06T2207/30004 ,  G06T2211/408 ,  G06T2211/424

Abstract: The present disclosure relates to a self-prior information based X-ray dual-energy CT reconstruction method, which can utilize information inherent in data to provide a prior model, thereby obtaining a reconstructed image with a high quality. The X-ray dual-energy CT reconstruction method according to the present disclosure comprises: (a) rating an energy spectrum and establishing a dual-energy lookup table; (b) collecting high-energy data pH and low-energy data pL of a dual-energy CT imaging system using a detector of the dual-energy CT imaging system; (c) obtaining projection images R1 and R2 of scaled images r1 and r2 according to the obtained high-energy data pH and low-energy data pL; (d) reconstructing the scaled image r2 using a first piece-wise smooth constraint condition and thereby obtaining an electron density image; and (e) reconstructing the scaled image r1 using a second piece-wise smooth constraint condition and thereby obtaining an equivalent atomic number image. In the present disclosure, the noise in the dual-energy reconstructed image can be effectively prohibited while keeping the resolution by effectively using information inherent in data.

Abstract translation: 本公开涉及一种基于自我先验信息的X射线双能CT重建方法，其可以利用数据中固有的信息来提供先验模型，从而获得具有高质量的重建图像。 根据本公开的X射线双能CT重建方法包括：（a）评估能谱并建立双能量查找表; （b）使用双能CT成像系统的检测器收集双能CT成像系统的高能数据pH和低能量数据pL; （c）根据获得的高能量数据pH和低能量数据pL，获得缩放图像r1和r2的投影图像R1和R2; （d）使用第一分段平滑约束条件重建缩放图像r2，从而获得电子密度图像; 和（e）使用第二分段平滑约束条件重建缩放图像r1，从而获得等效的原子序数图像。 在本公开中，可以有效地禁止双能量重构图像中的噪声，同时通过有效地使用数据中固有的信息来保持分辨率。

公开(公告)号：US09507051B2

公开(公告)日：2016-11-29

申请号：US14577446

申请日：2014-12-19

Applicant: NUCTECH COMPANY LIMITED

Inventor： Jinyu Zhang ,  Lei Liao ,  Hui Ding ,  Hu Tang ,  Li Zhang

IPC: G01J5/02 ,  G01V8/24 ,  F16P3/14 ,  H03K17/94

CPC classification number: G01V8/24 ,  F16P3/144 ,  H03K17/943 ,  H03K2217/94026 ,  H03K2217/94112

Abstract: A photoelectric switch for detection of an object. The photoelectric switch comprises: a light transmitter unit comprising plural light transmitters configured to emit plural light signals; a light receiver unit comprising plural optical fiber receivers in one-to-one correspondence with the plural light transmitters and configured to receive the plural light signals and to merge plural light signals, wherein an object detection area is defined between the plural light transmitters and the plural optical fiber receivers; a photoelectric conversion unit connected to the optical fiber receivers and configured to perform photoelectric conversions on the merged light signals outputted by the optical fiber receivers so as to generate an electric signal; and a control and processing unit connected to both the light transmitter unit and the photoelectric conversion unit, and configured to control and process the light signals and/or the electric signal.

Abstract translation: 一种用于检测物体的光电开关。 光电开关包括：光发射器单元，包括配置为发射多个光信号的多个光发射器; 一种光接收单元，包括与多个光发射器一一对应的多个光纤接收器，并被配置为接收多个光信号并合并多个光信号，其中在多个光发射机和 多个光纤接收器; 光电转换单元，连接到光纤接收器，并被配置为对由光纤接收器输出的合并光信号执行光电转换，以产生电信号; 以及控制和处理单元，连接到光发射单元和光电转换单元，并且被配置为控制和处理光信号和/或电信号。

公开(公告)号：US09121811B2

公开(公告)日：2015-09-01

申请号：US13946498

申请日：2013-07-19

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang Chen ,  Li Zhang ,  Xuewu Wang ,  Haifeng Hu ,  Hongxin Wu ,  Yuanjing Li ,  Yinong Liu ,  Ziran Zhao ,  Yuxiang Xing ,  Hu Tang ,  Yumin Yi ,  Jinyu Zhang

IPC: A61B6/00 ,  G01N23/10 ,  G01N23/04 ,  G01V5/00 ,  G01N1/02 ,  A61B6/02

CPC classification number: G01N23/10 ,  A61B6/027 ,  G01N23/046 ,  G01N2001/022 ,  G01N2223/419 ,  G01N2223/423 ,  G01N2223/637 ,  G01N2223/639 ,  G01V5/00

Abstract: Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether there are drugs concealed in the inspected liquid article based on the difference between the acquired physical attributes and reference physical attributes of the inspected liquid article. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

Abstract translation: 公开了一种用于双能CT成像的液体物品的安全检查方法和装置。 该方法包括以下步骤：通过CT扫描获得包括待检查的液体物品的物理属性的一个或多个CT图像和双能量重建方法; 从CT图像获取每个液体物品的物理属性; 并且基于被检查的液体制品的所获取的物理属性和参考物理属性之间的差异来确定在被检查的液体制品中是否存在隐藏的药物。 CT扫描可以通过正常的CT扫描技术或螺旋CT扫描技术来实现。 在正常的CT扫描技术中，扫描位置可以由操作员预先设置，或者通过DR图像设置，或者通过DR图像的自动分析设置。