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1. 发明申请

US20140010346A1 METHOD AND DEVICE FOR INSPECTION OF LIQUID ARTICLES 审中-公开
标题翻译：检测液体物品的方法和装置
公开(公告)号：US20140010346A1
公开(公告)日：2014-01-09
申请号：US13946498
申请日：2013-07-19
申请人： Nuctech Company Limited , Tsinghua University
发明人： 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分类号： G01N23/10
CPC分类号： G01N23/10 , A61B6/027 , G01N23/046 , G01N2001/022 , G01N2223/419 , G01N2223/423 , G01N2223/637 , G01N2223/639 , G01V5/00
摘要： 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.
摘要翻译：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。

2. 发明申请

US20210286842A1 SEMANTIC-BASED METHOD AND APPARATUS FOR RETRIEVING PERSPECTIVE IMAGE 有权
公开(公告)号：US20210286842A1
公开(公告)日：2021-09-16
申请号：US17202088
申请日：2021-03-15
申请人： Tsinghua University , Nuctech Company Limited
发明人： Li Zhang , Zhiqiang Chen , Yuanjing Li , Yuxiang Xing , Fanhua Meng , Qiang Li , Wei Li , Gang Fu
IPC分类号： G06F16/583 , G06K9/00 , G06F16/55
摘要： A semantic-based method and apparatus for retrieving a perspective image, an electronic device and a computer-readable storage medium are provided. An method includes obtaining a perspective image for a space containing an inspected object therein. A semantic division on the perspective image is performed using a first method, to obtain a plurality of semantic region units. A feature extraction network is constructed using a second method. Based on the perspective image and each of the plurality of semantic region units, a feature of each semantic region unit is extracted using the feature extraction network. Based on the feature of each semantic region unit, an image most similar to the semantic region unit is retrieved from an image feature database, to assist in determining an inspected object in the semantic region unit.

3. 发明授权

US10914693B2 Ray transmission and fluorescence CT imaging system and method 有权
公开(公告)号：US10914693B2
公开(公告)日：2021-02-09
申请号：US16045243
申请日：2018-07-25
申请人： Tsinghua University , NUCTECH COMPANY LIMITED
发明人： Liang Li , Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Siyuan Zhang
IPC分类号： G01N23/00 , G01N23/2206 , G01N23/046 , G01N23/223 , A61B6/03 , A61B6/06 , A61B6/10 , A61B6/00
摘要： 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.

4. 发明授权

US10649104B2 Methods and apparatuses for reconstructing incident energy spectrum for a detector 有权
公开(公告)号：US10649104B2
公开(公告)日：2020-05-12
申请号：US15597003
申请日：2017-05-16
申请人： Tsinghua University , NUCTECH COMPANY LIMITED
发明人： Liang Li , Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Kejun Kang , Lan Zhang , Ruizhe Li
IPC分类号： G01T1/36 , G01N23/223 , G01T7/00
摘要： A method and apparatus for reconstructing an incident energy spectrum for a detector are disclosed. In this method, an object to be inspected is illuminated with rays, and then rays transmitted through the object to be inspected are received by the detector to convert the received rays into data of a detected energy spectrum. The incident energy spectrum for the detector is reconstructed based on the data of the energy spectrum using a statistical iterative algorithm with a pre-established detector response function. With the above solution of the embodiments, the incident energy spectrum for the detector can be more accurately acquired, thereby reducing a distortion of the incident energy spectrum caused by the detector.

5. 发明授权

US10339673B2 Dual-energy ray imaging methods and systems 有权
公开(公告)号：US10339673B2
公开(公告)日：2019-07-02
申请号：US15129455
申请日：2015-12-23
申请人： Tsinghua University , NUCTECH COMPANY LIMITED
发明人： Liang Li , Zhiqiang Chen , Kejun Kang , Li Zhang , Ziran Zhao , Yuxiang Xing , Yongshun Xiao , Jianping Gu , Juan Zheng
IPC分类号： G01N23/04 , G06T11/00 , G06T7/00
摘要： 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.

6. 发明授权

US09513235B2 X-ray dual-energy CT reconstruction method 有权
标题翻译： X射线双能CT重建方法
公开(公告)号：US09513235B2
公开(公告)日：2016-12-06
申请号：US14337209
申请日：2014-07-22
申请人： TSINGHUA UNIVERSITY , NUCTECH COMPANY LIMITED
发明人： Yuxiang Xing , Le Shen , Li Zhang , Zhiqiang Chen , Liang Li
IPC分类号： G01N23/04 , G06T11/00
CPC分类号： G01N23/046 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/408 , G06T2211/424
摘要： 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.
摘要翻译：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。

7. 发明授权

US09121811B2 Method and device for inspection of liquid articles 有权
标题翻译：液体制品检验方法及装置
公开(公告)号：US09121811B2
公开(公告)日：2015-09-01
申请号：US13946498
申请日：2013-07-19
申请人： Tsinghua University , Nuctech Company Limited
发明人： 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分类号： A61B6/00 , G01N23/10 , G01N23/04 , G01V5/00 , G01N1/02 , A61B6/02
CPC分类号： G01N23/10 , A61B6/027 , G01N23/046 , G01N2001/022 , G01N2223/419 , G01N2223/423 , G01N2223/637 , G01N2223/639 , G01V5/00
摘要： 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.
摘要翻译：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。

8. 发明授权

US09058658B2 Methods and devices for locating object in CT imaging 有权
标题翻译： CT成像定位对象的方法和装置
公开(公告)号：US09058658B2
公开(公告)日：2015-06-16
申请号：US14037236
申请日：2013-09-25
申请人： Tsinghua University , Nuctech Company Limited
发明人： Liang Li , Li Zhang , Zhiqiang Chen , Ziran Zhao , Yuxiang Xing , Yongshun Xiao , Qingli Wang
IPC分类号： A61B6/00 , G06T7/00 , G06T11/00 , G06F19/00
CPC分类号： G06T7/004 , A61B6/4085 , A61B6/466 , A61B6/469 , A61B6/5258 , G06T7/0012 , G06T7/55 , G06T7/70 , G06T11/006 , G06T2211/421 , G06T2211/436 , G16H40/63
摘要： The present disclosure provides methods and devices for locating a plurality of interested objects in CT imaging. Location of the interested objects in the three-dimensional space can be determined by using three projection images that are substantially perpendicular to each other. The method can rapidly locate interested objects in a CT image without pre-reconstruction of the CT image even if there are a plurality of interested objects in the field of view. The algorithm does not involve interactive steps. The method is rapid and effective, and thus applicable to industrial applications.
摘要翻译：本公开提供了用于在CT成像中定位多个感兴趣对象的方法和装置。可以通过使用基本上彼此垂直的三个投影图像来确定兴趣对象在三维空间中的位置。即使在视野中存在多个感兴趣的对象，该方法也可以快速定位CT图像中的感兴趣的对象，而无需对CT图像进行预重建。该算法不涉及交互式步骤。该方法快速有效，适用于工业应用。

9. 发明授权

US10769821B2 Method and device for reconstructing CT image and storage medium 有权
公开(公告)号：US10769821B2
公开(公告)日：2020-09-08
申请号：US16045383
申请日：2018-07-25
申请人： NUCTECH COMPANY LIMITED , Tsinghua University
发明人： Yuxiang Xing , Li Zhang , Jianmin Li , Zhiqiang Chen , Jianping Gu
IPC分类号： G06T5/20 , G06T11/00 , G06T5/00 , G06T3/40 , G06N3/04
摘要： 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.

10. 发明申请

US20190192090A1 DECOMPOSITION METHOD AND APPARATUS BASED ON BASIS MATERIAL COMBINATION 审中-公开
公开(公告)号：US20190192090A1
公开(公告)日：2019-06-27
申请号：US16232072
申请日：2018-12-26
申请人： TSINGHUA UNIVERSITY , NUCTECH COMPANY LIMITED
发明人： Liang Li , Zhiqiang Chen , Kejun Kang , Ziran Zhao , Li Zhang , Yuxiang Xing , Tiao Zhao , Jianmin Li , Bicheng Liu , Qian Yi
IPC分类号： A61B6/03 , G06T11/00 , A61B6/00
摘要： 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.

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