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    Dual-energy material identification method and apparatus with undersampling
    1.
    发明授权
    Dual-energy material identification method and apparatus with undersampling 有权
    双能材料识别方法和装备欠采样

    公开(公告)号：US08582857B2

    公开(公告)日：2013-11-12

    申请号：US13322243

    申请日：2009-12-30

    申请人： Zhiqiang Chen ,  Li Zhang ,  Yuanyuan Liu ,  Yuxiang Xing ,  Ziran Zhao

    发明人： Zhiqiang Chen ,  Li Zhang ,  Yuanyuan Liu ,  Yuxiang Xing ,  Ziran Zhao

    IPC分类号： G06K9/00 ,  A61B6/00 ,  A61B5/05

    CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5205 ,  G06T11/005 ,  G06T11/008 ,  G06T2211/408

    摘要： A dual-energy material identification method and system with under-sampling is disclosed. A CT image of the object is obtained by using the CT image reconstruction method, while the dual-energy projections are under-sampled to obtain a few samples. Photoelectric coefficient integral and Compton coefficient integral are computed from these dual-energy projection data. The CT image is segmented into regions with image processing technique, and the regions are labeled. The length by which a few dual-energy rays crosses each labeled region is computed, and an equation system is established with dual-energy preprocessing dual-effect decomposition reconstruction method to compute Photoelectric coefficient and Compton coefficient, and then atomic number and electron density of material in each region are computed. The material of the object can be identified with the atomic number.

    摘要翻译： 公开了一种具有欠采样的双能量材料识别方法和系统。 通过使用CT图像重建方法获得对象的CT图像，而双能量投影被低取样以获得少量样本。 从这些双能量投影数据计算光电系数积分和康普顿系数积分。 CT图像被分割成具有图像处理技术的区域，并且区域被标记。 计算出一些双能量射线穿过每个标记区域的长度，并用双能预处理双效分解重建方法建立方程组，计算光电系数和康普顿系数，然后计算原子数和电子密度 计算每个区域的材料。 可以用原子序号识别物体的材料。

    Dual-Energy Material Identification Method and Apparatus with Undersampling
    2.
    发明申请
    Dual-Energy Material Identification Method and Apparatus with Undersampling 有权
    双能量材料识别方法与装置

    公开(公告)号：US20120148133A1

    公开(公告)日：2012-06-14

    申请号：US13322243

    申请日：2009-12-30

    申请人： Zhiqiang Chen ,  Li Zhang ,  Yuanyuan Liu ,  Yuxiang Xing ,  Ziran Zhao

    发明人： Zhiqiang Chen ,  Li Zhang ,  Yuanyuan Liu ,  Yuxiang Xing ,  Ziran Zhao

    IPC分类号： G06K9/34

    CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5205 ,  G06T11/005 ,  G06T11/008 ,  G06T2211/408

    摘要： A dual-energy material identification method and system with under-sampling is disclosed. A CT image of the object is obtained by using the CT image reconstruction method, while the dual-energy projections are under-sampled to obtain a few samples. Photoelectric coefficient integral and Compton coefficient integral are computed from these dual-energy projection data. The CT image is segmented into regions with image processing technique, and the regions are labeled. The length by which a few dual-energy rays crosses each labeled region is computed, and an equation system is established with dual-energy preprocessing dual-effect decomposition reconstruction method to compute Photoelectric coefficient and Compton coefficient, and then atomic number and electron density of material in each region are computed. The material of the object can be identified with the atomic number.

    摘要翻译： 披露了一种双能量材料识别方法和具有欠采样的系统。 通过使用CT图像重建方法获得对象的CT图像，而双能量投影被低取样以获得少量样本。 从这些双能量投影数据计算光电系数积分和康普顿系数积分。 CT图像被分割成具有图像处理技术的区域，并且区域被标记。 计算出一些双能量射线穿过每个标记区域的长度，并用双能预处理双效分解重建方法建立方程组，计算光电系数和康普顿系数，然后计算原子数和电子密度 计算每个区域的材料。 可以用原子序号识别物体的材料。

    Computer tomography imaging device and method
    5.
    发明授权
    Computer tomography imaging device and method 有权
    计算机断层扫描成像装置及方法

    公开(公告)号：US09380984B2

    公开(公告)日：2016-07-05

    申请号：US13322696

    申请日：2009-12-30

    申请人： Liang Li ,  Zhiqiang Chen ,  Li Zhang ,  Kejun Kang ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao

    发明人： Liang Li ,  Zhiqiang Chen ,  Li Zhang ,  Kejun Kang ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao

    IPC分类号： G06T11/00 ,  A61B6/03 ,  A61B6/06 ,  A61B6/00

    CPC分类号： A61B6/032 ,  A61B6/06 ,  A61B6/4452 ,  A61B6/469 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421 ,  G06T2211/424

    摘要： The present invention discloses a method for performing CT imaging on a region of interest of an object under examination, comprising: acquiring the CT projection data of the region of interest; acquiring the CT projection data of region B; selecting a group of PI line segments covering the region of interest, and calculating the reconstruction image value for each PI line segment in the group; and combining the reconstruction image values in all the PI line segments to obtain the image of the region of interest. The present invention further discloses a CT imaging device using this method and a data processor therein. Since the 2D/3D slice image of the region of interest can be exactly reconstructed and obtained as long as the X-ray beam covers the region of interest and the region B, it is possible to use a small-sized detector to perform CT imaging on the region of interest at any position of a large-sized object, which reduces to a great extent the radiation dose of the X-ray during the CT scanning.

    摘要翻译： 本发明公开了一种对被检查物体的感兴趣区域进行CT成像的方法，包括：获取感兴趣区域的CT投影数据; 获取区域B的CT投影数据; 选择覆盖感兴趣区域的一组PI线段，并计算组中每个PI线段的重建图像值; 并且将所有PI线段中的重建图像值组合以获得感兴趣区域的图像。 本发明还公开了一种使用该方法的CT成像装置及其中的数据处理器。 由于只要X射线束覆盖感兴趣区域和区域B，就可以精确地重构和获得感兴趣区域的2D / 3D切片图像，因此可以使用小尺寸检测器来执行CT成像 在大尺寸物体的任何位置处的感兴趣区域，其在CT扫描期间在很大程度上降低X射线的辐射剂量。

    Imaging system
    6.
    发明授权
    Imaging system 有权
    成像系统

    公开(公告)号：US07672427B2

    公开(公告)日：2010-03-02

    申请号：US11545255

    申请日：2006-10-10

    申请人： Zhiqiang Chen ,  Li Zhang ,  Hewei Gao ,  Kejun Kang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

    发明人： Zhiqiang Chen ,  Li Zhang ,  Hewei Gao ,  Kejun Kang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

    IPC分类号： G01N23/04

    CPC分类号： G01N23/04 ,  A61B6/027

    摘要： It is disclosed an imaging system comprising: radiation generating means including at least one radiation source for generating radiations; data acquiring means including an detector matrix faced the radiation source for obtaining projection data by receiving radiations penetrated through an object to be inspected; transporting means for making the object to be inspected between the radiation source and the detector matrix linearly moving relative to the radiation source and the detector matrix; and controlling and image processing means for controlling the radiation generating means, the data acquiring means and the transporting means, and for reconstructing an image of the object to be inspected from the projection data. The imaging system according to the present invention achieves a real stereoscopic radiography by using straight-line trajectory scan and reconstructing a tomographic or stereoscopic image through a straight-line filtered back-projection algorithm. The present imaging system has advantages of fast examination speed, no rotation, and out of large cone-angle problem in a circular-orbit cone-beam CT.

    摘要翻译： 公开了一种成像系统，包括：辐射发生装置，其包括用于产生辐射的至少一个辐射源; 数据获取装置，包括面向辐射源的检测器矩阵，用于通过接收穿过待检查对象的辐射来获得投影数据; 用于使所述物体在所述辐射源和所述检测器矩阵之间相对于所述辐射源和所述检测器矩阵线性移动的传送装置; 以及控制和图像处理装置，用于控制辐射发生装置，数据获取装置和传送装置，并用于从投影数据重建待检查对象的图像。 根据本发明的成像系统通过使用直线轨迹扫描并通过直线过滤的反投影算法重建断层摄影或立体图像来实现真正的立体放射照相。 本发明的成像系统在圆锥轨道锥形CT中具有检测速度快，无旋转和大锥角问题的优点。

    System and method for reconstructing image by using straight-line trajectory scan
    7.
    发明申请
    System and method for reconstructing image by using straight-line trajectory scan 有权
    使用直线轨迹扫描重建图像的系统和方法

    公开(公告)号：US20070116175A1

    公开(公告)日：2007-05-24

    申请号：US11546717

    申请日：2006-10-12

    申请人： Li Zhang ,  Hewei Gao ,  Zhiqiang Chen ,  Kejun Kang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

    发明人： Li Zhang ,  Hewei Gao ,  Zhiqiang Chen ,  Kejun Kang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

    IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

    CPC分类号： G01N23/046 ,  A61B6/032 ,  G01N2223/3303 ,  G01N2223/419 ,  G06T11/006 ,  G06T2211/421

    摘要： It is disclosed a system and a method for reconstructing an image by using a straight-line trajectory scan to avoid image spatial resolution reduction due to interpolations in angular direction and detector direction during data rebinning. This system comprises: a projection data conversion section for converting projection data from straight-line trajectory scan into projection data under quasi-parallel-beam scan; a filtration section for obtaining filtered projection data by convoluting the projection data under quasi-parallel-beam scan with a predetermined convolutional kernel; and a back-projection section for reconstructing an image by back-projecting the filtered projection data with a weighting factor. By using the inventive system and method, the spatial resolution in the reconstructed image is improved, and the influence of data truncation on the reconstructed image is reduced. The present invention applies the filtration and back-projection mode, and thus has general advantages of the filtration and back projection, such as simplicity and efficiency. And it is easy to be parallelized and accelerated.

    摘要翻译： 公开了一种通过使用直线轨迹扫描来重建图像的系统和方法，以避免在数据重组期间由于在角度方向和检测器方向上的内插而导致的图像空间分辨率降低。 该系统包括：投影数据转换部分，用于将投影数据从直线轨迹扫描转换成准并行束扫描的投影数据; 过滤部分，用于通过用预定的卷积核在准平行束扫描下卷积投影数据来获得经滤波的投影数据; 以及背投影部分，用于通过用加权因子反投影过滤的投影数据来重建图像。 通过使用本发明的系统和方法，改善了重建图像中的空间分辨率，减少了数据截断对重建图像的影响。 本发明应用过滤和反投影模式，因此具有过滤和反投影的一般优点，例如简单性和效率。 并行并行加速很容易。

    X RAY SOURCE GRATING STEPPING IMAGING SYSTEM AND IMAGE METHOD
    9.
    发明申请
    X RAY SOURCE GRATING STEPPING IMAGING SYSTEM AND IMAGE METHOD 有权
    X射线照相梯度成像系统和图像方法

    公开(公告)号：US20130094625A1

    公开(公告)日：2013-04-18

    申请号：US13641542

    申请日：2010-12-27

    申请人： Zhifeng Huang ,  Zhiqiang Chen ,  Li Zhang ,  Yuanjing Li ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao ,  Liang Li ,  Fei Ding

    发明人： Zhifeng Huang ,  Zhiqiang Chen ,  Li Zhang ,  Yuanjing Li ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao ,  Liang Li ,  Fei Ding

    IPC分类号： G01N23/04

    CPC分类号： G01N23/046 ,  A61B6/4291 ,  A61B6/484 ,  G01N2223/419

    摘要： An X-ray imaging system comprising: an X-ray source, a source grating, a fixed grating module and an X-ray detector, which are successively positioned in the propagation direction of X-ray; an object to be detected is positioned between the source grating and the fixed gating module; said source grating can perform stepping movement in a direction perpendicular to the optical path and grating stripes; wherein the system further comprises a computer workstation for controlling said X-ray source, source grating and X-ray detector so as to perform the following processes: the source grating performs stepping movement in at least one period thereof; at each stepping step, the X-ray source emits X-ray to the object to be detected, and the detector receives the X-ray at the same time; wherein after at least one period of stepping and data acquisition, the light intensity of X-ray at each pixel point on the detector is represented as a light intensity curve; the light intensity curve at each pixel point on the detector is compared with a light intensity curve in the absence of the object to be detected, a pixel value of each pixel point is calculated from change in said light intensity curve; an image of the detected object is reconstructed according to the calculated pixel value.

    摘要翻译： 一种X射线成像系统，包括：X射线源，源光栅，固定光栅模块和X射线检测器，其依次位于X射线的传播方向上; 要检测的物体位于源光栅和固定门控模块之间; 所述源光栅可以在垂直于光路和光栅条纹的方向上执行步进运动; 其中所述系统还包括用于控制所述X射线源，源光栅和X射线检测器的计算机工作站，以便执行以下处理：源光栅在其至少一个周期中执行步进运动; 在每个步进步骤中，X射线源向被检测物体发射X射线，并且检测器同时接收X射线; 其中在步进和数据采集的至少一个周期之后，将检测器上每个像素点处的X射线的光强度表示为光强度曲线; 将检测器上的每个像素点处的光强度曲线与不存在待检测对象的光强度曲线进行比较，根据所述光强度曲线的变化计算每个像素点的像素值; 根据计算出的像素值重建被检测物体的图像。

    Method and device for inspection of liquid articles
    10.
    发明授权
    Method and device for inspection of liquid articles 有权
    液体制品检验方法及装置

    公开(公告)号：US08320523B2

    公开(公告)日：2012-11-27

    申请号：US13177905

    申请日：2011-07-07

    申请人： Li Zhang ,  Zhiqiang Chen ,  Xuewu Wang ,  Haifeng Hu ,  Hongxin Wu ,  Yuanjing Li ,  Yinong Liu ,  Ziran Zhao ,  Yuxiang Xing ,  Hu Tang ,  Yumin Yi ,  Jinyu Zhang

    发明人： Li Zhang ,  Zhiqiang Chen ,  Xuewu Wang ,  Haifeng Hu ,  Hongxin Wu ,  Yuanjing Li ,  Yinong Liu ,  Ziran Zhao ,  Yuxiang Xing ,  Hu Tang ,  Yumin Yi ,  Jinyu Zhang

    IPC分类号： G01N23/04

    CPC分类号： G01N9/24 ,  G01V5/00

    摘要： Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether the inspected liquid article is dangerous based on the physical attributes. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

    摘要翻译： 公开了一种用于双能CT成像的液体物品的安全检查方法和装置。 该方法包括以下步骤：通过CT扫描获得包括待检查的液体物品的物理属性的一个或多个CT图像和双能量重建方法; 从CT图像获取每个液体物品的物理属性; 并根据物理属性确定被检液体是否危险。 CT扫描可以通过正常的CT扫描技术或螺旋CT扫描技术来实现。 在正常的CT扫描技术中，扫描位置可以由操作员预先设置，或者通过DR图像设置，或者通过DR图像的自动分析设置。