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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:US11906447B2
公开(公告)日:2024-02-20
申请号:US17471725
申请日:2021-09-10
Applicant: NUCTECH COMPANY LIMITED , Tsinghua University
Inventor: Zhiqiang Chen , Li Zhang , Xiaofei Xu , Le Shen , Ming Chang , Hu Tang , Xin Jin , Yunda Sun
IPC: G01N23/046 , G01N23/083 , G01N23/10 , G01V5/00
CPC classification number: G01N23/10 , G01N23/046 , G01N23/083 , G01N2223/1016 , G01N2223/204 , G01N2223/3301 , G01N2223/335 , G01N2223/3307 , G01N2223/3308 , G01N2223/419 , G01N2223/639 , G01N2223/643 , G01V5/005
Abstract: A multi-channel static CT device is provided, and the multi-channel static CT device includes: a scanning channel including a plurality of scanning sub-channels; a distributed X-ray source including a plurality of ray emission points arranged around the scanning channel; and a detector module including a plurality of detectors arranged around the scanning channel, wherein the plurality of detectors are arranged corresponding to the plurality of ray emission points.
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公开(公告)号:US09805504B2
公开(公告)日:2017-10-31
申请号:US14711949
申请日:2015-05-14
Applicant: Nuctech Company Limited
Inventor: Li Zhang , Zhiqiang Chen , Qingping Huang , Yunda Sun , Zhi Tang , Le Shen , Hu Tang , Qianlu Ren , Xin Jin
CPC classification number: G06T17/00 , A61B6/032 , A61B6/463 , A61B6/466 , A61B6/5205 , A61B6/5223 , G01N23/046 , G06T11/003 , G06T19/003 , G06T2207/10081 , G06T2207/10124 , G06T2207/30004 , G06T2207/30196 , G06T2210/41 , G06T2211/436 , G06T2219/016 , G06T2219/028 , G06T2219/2004
Abstract: The present disclosure discloses an image display method in a CT system. The method comprises: implementing CT scanning on an inspected object, to obtain CT projection data; organizing the CT projection data according to a predetermined interval; extracting basic data from the organized CT projection data by using a fixed angle as a start angle and using 360 degrees as an interval; forming a DR image based on the extracted basic data; reconstructing a three-dimensional image of the inspected object from the CT projection data; and displaying the DR image and the reconstructed three-dimensional image on a screen at the same time. In the solution, the CT data is processed to obtain DR data. After the DR data is obtained, a DR image is obtained directly using a DR data processing algorithm. This enables an image recognizer to more accurately and more rapidly inspect goods carried by a passenger using the existing experience in image recognition of the DR image.
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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
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.
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公开(公告)号:US09746579B2
公开(公告)日:2017-08-29
申请号:US14576737
申请日:2014-12-19
Applicant: Tsinghua University , Nuctech Company Limited
Inventor: Li Zhang , Zhiqiang Chen , Qingping Huang , Xin Jin , Yunda Sun , Le Shen , Ji Zhao
CPC classification number: G01V5/005 , G01N23/046 , G01T7/08 , G06T11/003 , G06T2207/10072 , G06T2211/40
Abstract: A CT system and method thereof are disclosed. The system includes: a conveyor mechanism; a first scanning stage configured to scan the object and generate a first digital signal; a second scanning stage spaced from the first scanning stage at a preset distance in a direction of the object's movement; a processing device configured to reconstruct a CT image of the object at a first image quality based on the first digital signal, and analyze the CT image; and a control device configured to adjust a scanning parameter of the second scanning stage based on an analysis result of the processing device to cause the second scanning stage to output a second digital signal. The processing device reconstructs a CT image of the object at a second image quality higher than the first image quality at least based on the second digital signal. The system takes full advantage of the distributed ray sources which replace the normal slip ring technology.
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公开(公告)号:US09702832B2
公开(公告)日:2017-07-11
申请号:US14304848
申请日:2014-06-13
Applicant: NUCTECH COMPANY LIMITED
Inventor: Le Shen , Yuxiang Xing , Li Zhang , Zhiqiang Chen
CPC classification number: G01N23/046 , A61B6/032 , A61B6/4085 , A61B6/4241 , A61B6/482 , A61B6/5205 , A61B6/5258 , G06T11/005 , G06T11/006 , G06T2211/408 , G06T2211/436
Abstract: Disclosed is a CT imaging method and system. The method includes: CT scanning an object with a dual-energy CT system to obtain a first complete set of projection data in a first scan mode, and to obtain a second incomplete set of projection data in a second scan mode; reconstructing a first attenuation coefficient image of the object from the first set of projection data, and extracting, from the first attenuation coefficient image, prior structure information of the object indicating edge intensity; and reconstructing a second attenuation coefficient image of the object from the second incomplete set of projection data using the extracted prior structure information as a constraint. With the method using the prior structure information of the imaged object as a constraint in reconstruction, it is possible to dramatically reduce an amount of data required for reconstruction, and achieve satisfactory effects even with ill-conditioned problems of limited-angle and inner reconstruction.
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公开(公告)号:US09326743B2
公开(公告)日:2016-05-03
申请号:US14135023
申请日:2013-12-19
Applicant: TSINGHUA UNIVERSITY , NUCTECH COMPANY LIMITED
Inventor: Le Shen , Yuxiang Xing , Qi Shen , Meng Cao , Li Zhang , Zhiqiang Chen
CPC classification number: A61B6/482 , A61B5/4869 , A61B6/027 , A61B6/5205 , A61B6/54 , G01N23/046 , G01N2223/419 , G01V5/005
Abstract: The present invention relates to a Computed Tomography (CT) imaging system, in particular to a multi-energy CT imaging system and imaging method.
Abstract translation: 本发明涉及一种计算机断层成像(CT)成像系统,特别涉及一种多能CT成像系统和成像方法。
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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:US20180217071A1
公开(公告)日:2018-08-02
申请号:US15505199
申请日:2015-12-23
Applicant: Tsinghua University , Nuctech Company Limited
Inventor: Zhiqiang Chen , Li Zhang , Le Shen , Qingping Huang , Xin Jin
IPC: G01N23/046
CPC classification number: G01N23/046 , G01N23/041 , G01N2223/1016 , G01N2223/419
Abstract: An X-ray imaging system and method are provided. The system may include: an X-ray source configured to irradiate X-ray beams; a first grating and a second grating arranged sequentially in an irradiation direction of the X-ray beams; a detector arranged at downstream of the second grating in the irradiation direction; and a controller and data processing device configured to control the X-ray source to irradiate the X-ray beams, to control the detector to receive X-ray beams passing through the first grating and the second grating to generate phase contrast information and/or dark field information, and to perform CT check on an object under check based on the phase contrast information and/or the dark field information to obtain a CT image. In this way, it is possible to obtain more characteristic information about the object under check, so as to achieve more precise material recognition and security check.
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公开(公告)号:US09885801B2
公开(公告)日:2018-02-06
申请号:US14748407
申请日:2015-06-24
Applicant: Tsinghua University , Nuctech Company Limited
Inventor: Zhiqiang Chen , Li Zhang , Xin Jin , Qingping Huang , Le Shen , Yunda Sun
CPC classification number: G01V5/0041 , A61B6/4266 , G01T1/202 , G01T1/362 , G01T7/08 , G01V5/005
Abstract: The present disclosure discloses a detector device comprising a plurality of detector assemblies. Each detector assembly comprises at least one detection crystal units having a first energy response and those having a second energy response, which are both arranged along a first direction at intervals, each detection crystal unit having a first/second energy response including at least one detection crystals having a first/second energy response arranged along a second direction. The at least one detection crystal units having a first energy response and the at least one detection crystal units having a second energy response are, at least partially, alternatively arranged along the first direction when viewed from an incidence direction of the X-ray. The present disclosure also discloses a dual energy CT system having the detector device and a CT detection method using this system.
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