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    X-ray dual-energy CT reconstruction method
    1.
    发明授权
    X-ray dual-energy CT reconstruction method 有权
    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

    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。

    CT systems and methods thereof
    5.
    发明授权
    CT systems and methods thereof 有权

    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

    IPC: A61B6/00 ,  G01V5/00 ,  G01N23/04 ,  G01T7/08 ,  G06T11/00

    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.

    CT imaging methods and systems
    6.
    发明授权
    CT imaging methods and systems 有权

    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

    IPC: A61B6/03 ,  G01N23/04 ,  A61B6/00 ,  G06T11/00

    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.

    X-ray detection method and X-ray detector
    8.
    发明授权
    X-ray detection method and X-ray detector 有权

    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.

    X-RAY IMAGING SYSTEM AND METHOD
    9.
    发明申请
    X-RAY IMAGING SYSTEM AND METHOD 审中-公开

    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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