公开(公告)号：US10339673B2

公开(公告)日：2019-07-02

申请号：US15129455

申请日：2015-12-23

申请人： Tsinghua University ,  NUCTECH COMPANY LIMITED

发明人： Liang Li ,  Zhiqiang Chen ,  Kejun Kang ,  Li Zhang ,  Ziran Zhao ,  Yuxiang Xing ,  Yongshun Xiao ,  Jianping Gu ,  Juan Zheng

IPC分类号： G01N23/04 ,  G06T11/00 ,  G06T7/00

摘要： 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.

公开(公告)号：US09058658B2

公开(公告)日：2015-06-16

申请号：US14037236

申请日：2013-09-25

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： Liang Li ,  Li Zhang ,  Zhiqiang Chen ,  Ziran Zhao ,  Yuxiang Xing ,  Yongshun Xiao ,  Qingli Wang

IPC分类号： A61B6/00 ,  G06T7/00 ,  G06T11/00 ,  G06F19/00

CPC分类号： G06T7/004 ,  A61B6/4085 ,  A61B6/466 ,  A61B6/469 ,  A61B6/5258 ,  G06T7/0012 ,  G06T7/55 ,  G06T7/70 ,  G06T11/006 ,  G06T2211/421 ,  G06T2211/436 ,  G16H40/63

摘要： 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.

摘要翻译： 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。

公开(公告)号：US10175182B2

公开(公告)日：2019-01-08

申请号：US14979259

申请日：2015-12-22

申请人： GRANDPECT COMPANY LIMITED ,  NUCTECH COMPANY LIMITED

发明人： Yongshun Xiao ,  Zhiqiang Chen ,  Ming Chang ,  Ziran Zhao

IPC分类号： G01N23/00 ,  G01N23/046 ,  G06T11/00

摘要： A CT detection method is provided, comprising the steps of: (1) scanning circumferentially an object to be detected by means of X-ray according to a preset angle sampling value, which represents the number of sampling points in one circle, so as to obtain a group of projection sampling data in different projection angles, the preset angle sampling value being greater than 1000; (2) processing the projection sampling data so as to obtain projection data of a plurality of virtual sub-focuses equivalent to a large focus of radiation source in a CT system; and (3) implementing an image reconstruction according to the projection data of the plurality of virtual sub-focuses.