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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.
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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
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.
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公开(公告)号：US10914693B2
公开(公告)日：2021-02-09
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: G01N23/00 , 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.
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公开(公告)号：US10649104B2
公开(公告)日：2020-05-12
申请号：US15597003
申请日：2017-05-16
Applicant: Tsinghua University , NUCTECH COMPANY LIMITED
Inventor： Liang Li , Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Kejun Kang , Lan Zhang , Ruizhe Li
IPC: G01T1/36 , G01N23/223 , G01T7/00
Abstract: 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.
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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
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.
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Patent Agency Ranking
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
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。
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公开(公告)号：US09058658B2
公开(公告)日：2015-06-16
申请号：US14037236
申请日：2013-09-25
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Liang Li , Li Zhang , Zhiqiang Chen , Ziran Zhao , Yuxiang Xing , Yongshun Xiao , Qingli Wang
CPC classification number: G06T7/004 , A61B6/4085 , A61B6/466 , A61B6/469 , A61B6/5258 , G06T7/0012 , G06T7/55 , G06T7/70 , G06T11/006 , G06T2211/421 , G06T2211/436 , G16H40/63
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：US11861963B2
公开(公告)日：2024-01-02
申请号：US17017967
申请日：2020-09-11
Applicant: NUCTECH COMPANY LIMITED , Tsinghua University
Inventor： Li Zhang , Gang Peng , Qingping Huang , Liang Li , Fan Yang , Jiabao Chen , Kun Cheng , Zhifeng He
CPC classification number: G07C9/29 , G07C9/00182 , G07C9/20 , G07C2009/0019
Abstract: The present disclosure provides a smart lock, including: a lock body and an unlocking structure; a Bluetooth communication module configured to receive a lock instruction or an unlock instruction based on Bluetooth communication; and one or more binding tags, each binding tag being associated with a Bluetooth address of the smart lock, wherein the unlocking structure is configured to lock or unlock the smart lock based on the lock instruction or the unlock instruction, or lock or unlock the smart lock based on an operation performed for the one or more binding tags. The present disclosure further provides a system and method for monitoring an object equipped with the smart lock.
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公开(公告)号：US10724969B2
公开(公告)日：2020-07-28
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: G01N23/04 , A61B6/00 , G01N23/046 , A61B6/03
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.
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公开(公告)号：US10448904B2
公开(公告)日：2019-10-22
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
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.
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