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公开(公告)号：US20140211917A1
公开(公告)日：2014-07-31
申请号：US14129655
申请日：2012-12-31
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Jia Hao , Liang Li
IPC: G01V5/00
CPC classification number: G01V5/0016 , A61B6/032 , A61B6/4007 , A61B6/4014 , A61B6/4078 , A61B6/4233 , A61B6/4275 , G01N23/046 , G01T1/2985 , G01V5/005
Abstract: The present invention discloses apparatus and method for ray scanning imaging. The apparatus comprises a plurality of ray generators and a ray detection device. The plurality of ray generators are arranged uniformly along a circular arc and emit ray beams in sequence or simultaneously to an object to be inspected within a single scanning period. The ray detection device may be either in a multi-segmental semi-closed configuration composed of a plurality of linear arrays of ray detectors or in a circular arc configuration where a plurality of ray detection units arranged uniformly along a circular arc. During the inspection, the apparatus is advantageous in obtaining the complete ray projection values without rotation thereof, so as to effectively shorten the inspection time.
Abstract translation: 本发明公开了一种用于射线扫描成像的装置和方法。 该装置包括多个射线发生器和射线检测装置。 多个射线发生器沿着圆弧均匀地布置，并且在单个扫描周期内依次发射射线束或同时发射到被检查物体。 射线检测装置可以是由多个线状阵列的射线检测器组成的多段半封闭构造，也可以是多个沿着圆弧均匀排列的射线检测单元的圆弧结构。 在检查期间，该装置有利于获得完整的射线投影值而不旋转，以便有效地缩短检查时间。
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公开(公告)号：US11151422B2
公开(公告)日：2021-10-19
申请号：US16725926
申请日：2019-12-23
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Yanjie Yao , Yongchun Liu , Yan Zhang , Ziran Zhao , Li Zhang , Yuxiang Xing
Abstract: Empty container identification method and system are disclosed. The method includes: obtaining customs declaration information, and finding out an vehicle declared as an empty container or an empty vehicle from the customs declaration information; performing X-ray inspection on the vehicle to acquire a transmission image of the vehicle; inputting the transmission image into an empty container identification model obtained by pre-training, so that the empty container identification model determines candidate regions of the transmission image, and performs post-processing analysis on the candidate regions to obtain an image identification result; and comparing the image identification result with the corresponding customs declaration information to determine whether or not the image identification result is consistent with the customs declaration information.
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23.发明授权公开(公告)号：US11022569B2
公开(公告)日：2021-06-01
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
Abstract: A low-angle self-swinging type computed tomography (CT) device is provided, having an X-ray accelerator and a plurality of rows of detectors and includes 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 object to be inspected passes through the slip ring, a three-dimensional CT image of the object is displayed, thereby achieving accurate inspection for large-scale objects, such as van containers.
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24.发明授权公开(公告)号：US10984565B2
公开(公告)日：2021-04-20
申请号：US16235882
申请日：2018-12-28
Applicant: Tsinghua University , NUCTECH COMPANY LIMITED
Inventor： Yuxiang Xing , Kaichao Liang , Le Shen , Li Zhang , Hongkai Yang , Kejun Kang , Zhiqiang Chen , Jianmin Li , Yinong Liu
Abstract: An image processing method, comprising: acquiring, by a CT scanning system, projection data of an object; and processing, by using a convolutional neural network, the projection data, to acquire an estimated image of the object. The convolutional neural network comprises: a projection domain network for processing input projection data to obtain estimated projection data; an analytical reconstruction network layer for performing analytical reconstruction to obtain a reconstructed image; an image domain network for processing the reconstructed image to obtain an estimated image, a projection layer for performing a projection operation by using a system projection matrix of the CT scanning system, to obtain a projection result of the estimated image; and a statistical model layer for determining consistency among the input projection data, the estimated projection data, and the projection result of the estimated image based on a statistical model.
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Patent Agency Ranking
公开(公告)号：US20190295250A1
公开(公告)日：2019-09-26
申请号：US16316487
申请日：2017-05-03
Applicant: Nuctech Company Limited
Inventor： Li Zhang , Sen Wang , Zhiqiang Chen , Yuxiang Xing , Xin Jin
Abstract: The present disclosure discloses a method, an apparatus and a system for reconstructing an image of a three-dimensional surface. The method comprises the following steps of: constructing a three-dimensional model of the three-dimensional surface using X-ray imaging data obtained by imaging the three-dimensional surface with X-ray and extracting three-dimensional coordinate parameters of feature points; constructing one or more two-dimensional posture images of the three-dimensional surface using visible light imaging data obtained by imaging the three-dimensional surface with visible lights, and extracting two-dimensional coordinate parameters of feature points from each of the two-dimensional posture images; establishing a mapping relationship between the two-dimensional posture image and the three-dimensional model by matching the three-dimensional coordinate parameters and the two dimensional coordinate parameters of the feature points in each of the two-dimensional posture image; and filling the one or more two-dimensional posture image onto the three-dimensional model utilizing the mapping relationship established for each of the two dimensional posture images to form a reconstructed image of the three-dimensional surface, wherein the X-ray imaging data and the visible light imaging data of the three-dimensional surface along the same orientation are simultaneously captured.
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26.发明申请公开(公告)号：US20170328844A1
公开(公告)日：2017-11-16
申请号：US15494884
申请日：2017-04-24
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Liang Li , Zhiqiang Chen , Kejun Kang , Li Zhang , Ziran Zhao , Yuxiang Xing , Jianmin Li , Yulan Li , Tiao Zhao
IPC: G01N23/087
CPC classification number: G01N23/087 , G01N23/046 , G01N2223/206 , G01N2223/419 , G01N2223/423
Abstract: Methods and system for decomposing a high-energy dual-energy X-ray CT material are disclosed. In the method, two types of effect such as Compton effect and electron pairing effect which dominates are reserved and the influence of the other effect such a photoelectric effect is removed so as to improve the accuracy of the material decomposition. The unique advantage of the present disclosure is to effectively remove the error of the calculated atomic number Z due to directly selecting two effects during processes of material decomposition in the conventional dual-energy CT method. This may greatly improve the accuracy of dual-energy CT identification of the material, and it is important to improve the conventional dual-use CT imaging system applications, such as clinical therapy, security inspection, industrial non-destructive testing, customs anti-smuggling and other fields.
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公开(公告)号：US09495772B2
公开(公告)日：2016-11-15
申请号：US14758795
申请日：2013-10-31
Applicant: NUCTECH COMPANY LIMITED , TSINGHUA UNIVERSITY
Inventor： Le Shen , Yuxiang Xing , Yuanji Li , Chuqing Feng , Li Zhang , Zhiqiang Chen
CPC classification number: G06T11/005 , A61B6/032 , A61B6/4241 , A61B6/4266 , A61B6/482 , A61B6/5205 , G01N23/046 , G01N2223/419 , G01T1/2985 , G06T5/50 , G06T2207/10081 , G06T2207/20182
Abstract: CT imaging systems and methods thereof are disclosed. A common CT scanning is performed on an object to obtain a common CT imaging. An area of interest is determined from the image. A CT scanning is performed on the area of interest under a plurality of energy windows by a photon counter detector. A high resolution image of the area of interest is reconstructed. The discrimination of energy spectrum is higher and the result so obtained is more stable by using a photon counter detector to collect photon count projection data of a plurality of energy windows and thus it may be decomposed into a plurality of basis functions.
Abstract translation: 公开了CT成像系统及其方法。 对物体执行常见的CT扫描以获得常见的CT成像。 根据图像确定感兴趣的区域。 通过光子计数器检测器在多个能量窗口下对感兴趣的区域进行CT扫描。 重建感兴趣区域的高分辨率图像。 通过使用光子计数器检测器来收集多个能量窗口的光子计数投影数据，能量谱的辨别较高，得到的结果更加稳定，因此可将其分解为多个基本函数。
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公开(公告)号：US09466137B2
公开(公告)日：2016-10-11
申请号：US14708866
申请日：2015-05-11
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Li Zhang , Zhiqiang Chen , Le Shen , Yuxiang Xing , Xin Jin , Qingping Huang
CPC classification number: G06T11/006 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/4266 , A61B6/5205 , G06T7/0012 , G06T2207/10081 , G06T2207/30004 , G06T2211/421
Abstract: The present disclosure discloses a spiral CT system and a reconstruction method thereof. In some embodiments, it is proposed that data missing due to a large pitch is compensated by weighting the complementary projection data of the projection data obtained using the spiral CT system. After the data is complemented, the projection data is rebinned as cone parallel beam data, cone-angle cosine weighting and one-dimensional filtering are implemented on the rebinned data, and parallel beam back projection is finally implemented on the filtered data, to obtain the reconstructed images. In some embodiments, with the above method, the speed of the belt can be increased by more than one time in a case that the existing area of the detectors and the existing speed of the slip ring are unchanged, thereby improving the pass rate of the luggage and maintaining the quality of the reconstructed images unchanged.
Abstract translation: 本公开公开了一种螺旋CT系统及其重建方法。 在一些实施例中，提出通过对使用螺旋CT系统获得的投影数据的互补投影数据进行加权来补偿由于大音调而丢失的数据。 数据补充后，将投影数据重新设置为锥形平行光束数据，对重定位数据进行锥角余弦加权和一维滤波，最后在滤波数据上实现平行光束反投影，获得 重建图像。 在一些实施例中，利用上述方法，在检测器的现有区域和滑环的现有速度不变的情况下，带的速度可以增加多于一次，从而提高了传感器的通过率 行李保持重建图像的质量不变。
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公开(公告)号：US09448325B2
公开(公告)日：2016-09-20
申请号：US14129655
申请日：2012-12-31
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Jia Hao , Liang Li
CPC classification number: G01V5/0016 , A61B6/032 , A61B6/4007 , A61B6/4014 , A61B6/4078 , A61B6/4233 , A61B6/4275 , G01N23/046 , G01T1/2985 , G01V5/005
Abstract: The present invention discloses apparatus and method for ray scanning imaging. The apparatus comprises a plurality of ray generators and a ray detection device. The plurality of ray generators are arranged uniformly along a circular arc and emit ray beams in sequence or simultaneously to an object to be inspected within a single scanning period. The ray detection device may be either in a multi-segmental semi-closed configuration composed of a plurality of linear arrays of ray detectors or in a circular arc configuration where a plurality of ray detectors arranged uniformly along a circular arc. During the inspection, the apparatus is advantageous in obtaining the complete ray projection values without rotation thereof, so as to effectively shorten the inspection time.
Abstract translation: 本发明公开了一种用于射线扫描成像的装置和方法。 该装置包括多个射线发生器和射线检测装置。 多个射线发生器沿着圆弧均匀地布置，并且在单个扫描周期内依次发射射线束或同时发射到被检查物体。 射线检测装置可以是由多个线性阵列的射线检测器组成的多节段半封闭构造，也可以是多个沿着圆弧均匀布置的射线检测器的圆弧形状。 在检查期间，该装置有利于获得完整的射线投影值而不旋转，以便有效地缩短检查时间。
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