公开(公告)号：US20140369458A1

公开(公告)日：2014-12-18

申请号：US14304848

申请日：2014-06-13

Applicant: NUCTECH COMPANY LIMITED

Inventor： Le SHEN ,  Yuxiang XING ,  Li ZHANG ,  Zhiqiang CHEN

IPC: G01N23/04

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.

Abstract translation: 公开了一种CT成像方法和系统。 该方法包括：用双能量CT系统对物体进行CT扫描，以第一扫描模式获得第一完整的投影数据集，并以第二扫描模式获得第二不完全投影数据集; 从所述第一组投影数据重建所述对象的第一衰减系数图像，并且从所述第一衰减系数图像提取所述对象的先前结构信息，指示边缘强度; 以及使用所提取的先前结构信息作为约束，从所述第二不完全投影数据集合重构所述对象的第二衰减系数图像。 通过使用成像对象的先前结构信息作为重建中的约束的方法，可以显着减少重建所需的数据量，并且即使在有限角度和内部重建的不良条件问题的情况下也能够获得令人满意的效果。

公开(公告)号：US20190086562A1

公开(公告)日：2019-03-21

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: G01T1/36 ,  G01N23/04

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.

公开(公告)号：US20190056338A1

公开(公告)日：2019-02-21

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: G01N23/2206 ,  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.

公开(公告)号：US20190035116A1

公开(公告)日：2019-01-31

申请号：US16045303

申请日：2018-07-25

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Yuxiang XING ,  Li ZHANG ,  Jianmin LI ,  Zhiqiang CHEN ,  Jianping GU

IPC: G06T11/00 ,  G06N5/04 ,  G06N3/08 ,  G06N3/04 ,  G06T5/00

Abstract: 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. The projection data is processed using a first convolutional neural network to obtain processed projection data. The first convolutional neural network comprises a plurality of convolutional layers. A back-projection operation is performed on the processed projection data to obtain a reconstructed image.

公开(公告)号：US20180328866A1

公开(公告)日：2018-11-15

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

CPC classification number: G01N23/046 ,  G01V5/005

Abstract: The present disclosure provides a low-angle self-swinging type computed tomography (CT) apparatus, which is provided with an X-ray accelerator and a plurality of rows of detectors and is configured to include 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 objected to be inspected passes through the slip ring, a three dimension CT image of the object is displayed, thereby achieving accurate inspection for large-scale objects, such as van containers.

公开(公告)号：US20160084775A1

公开(公告)日：2016-03-24

申请号：US14837205

申请日：2015-08-27

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Kejun KANG ,  Zhiqiang CHEN ,  Yuanjing LI ,  Li ZHANG ,  Ziran ZHAO ,  Yaohong LIU ,  Jianping GU ,  Liang LI ,  Yuxiang XING

IPC: G01N23/04

CPC classification number: G01N23/046 ,  G01V5/005

Abstract: The present disclosure provides a low-angle self-swinging type computed tomography (CT) apparatus, which is provided with an X-ray accelerator and a plurality of rows of detectors and is configured to include 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 objected to be inspected passes through the slip ring, a three dimension CT image of the object is displayed, thereby achieving accurate inspection for large-scale objects, such as van containers.

Abstract translation: 本公开提供了一种低角度自摆式计算机断层摄影（CT）装置，其设置有X射线加速器和多排检测器，并且构造成包括滑环，使得滑环具有 加速器和其上的检测器能够在被检查对象通过滑环的同时执行单摆往复运动，显示对象的三维CT图像，从而实现对大型物体的精确检查，例如 作为集装箱。

公开(公告)号：US20150030225A1

公开(公告)日：2015-01-29

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: G06T11/00 ,  G06T5/00 ,  G01N23/04

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。

公开(公告)号：US20140184773A1

公开(公告)日：2014-07-03

申请号：US14135922

申请日：2013-12-20

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Ziran ZHAO ,  Wanlong WU ,  Yuanjing LI ,  Zongjun SHEN ,  Li ZHANG ,  Yinong LIU ,  Jin CUI ,  Yingkang JIN ,  Liang LI ,  Yuxiang XING ,  Yongshun XIAO

IPC: G06K9/00 ,  G06K9/20 ,  H04N7/18

CPC classification number: G06K9/00375 ,  G01V3/12 ,  G01V8/005 ,  G06K9/209 ,  H04N7/18

Abstract: The present invention discloses a human body security inspection apparatus and a corresponding method. Specifically, the apparatus comprises: a human body security inspection device (1), configured to scan the human to be inspected (2) in order to inspect whether the human to be inspected (2) carries prohibited articles; a KINECT sensor (3), configured to real-timely acquire information about the human to be inspected (2) so that the human body security inspection device (1) is capable of real-timely acquiring the information of the human to be inspected (2) by means of the KINECT sensor (3), so as to determine whether the information conforms to requirements of the human body security inspection device (1); and a data processing device (4), configured to communicate with the human body security inspection device (1) and the KINECT sensor (3), in order to real-timely analyse and process the information of the human to be inspected (2).

Abstract translation: 本发明公开了一种人体安全检查装置和相应的方法。 具体地说，该装置包括：人体安全检查装置（1），被配置为扫描被检查的人（2），以检查被检查人（2）是否携带被禁止的物品; 一种KINECT传感器（3），被配置为实时获取关于待检查人的信息（2），使得人体安全检查装置（1）能够实时获取被检查人的信息（ 2）通过KINECT传感器（3），以确定信息是否符合人体安全检查装置（1）的要求; 以及数据处理装置（4），被配置为与人体安全检查装置（1）和KINECT传感器（3）进行通信，以便实时地分析和处理待检查的人的信息（2） 。