公开(公告)号：US08494114B2

公开(公告)日：2013-07-23

申请号：US13089874

申请日：2011-04-19

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

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

IPC分类号： G01N23/06

CPC分类号： G01N23/10 ,  A61B6/027 ,  G01N23/046 ,  G01N2001/022 ,  G01N2223/419 ,  G01N2223/423 ,  G01N2223/637 ,  G01N2223/639 ,  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 there are drugs concealed in the inspected liquid article based on the difference between the acquired physical attributes and reference physical attributes of the inspected liquid article. 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.

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。

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。

公开(公告)号：US08306180B2

公开(公告)日：2012-11-06

申请号：US12509977

申请日：2009-07-27

申请人： Li Zhang ,  Zhiqiang Chen ,  Kejun Kang ,  Haifeng Hu ,  Yuxiang Xing ,  Xinhui Duan ,  Yuanjing Li ,  Yinong Liu ,  Qingping Huang

发明人： Li Zhang ,  Zhiqiang Chen ,  Kejun Kang ,  Haifeng Hu ,  Yuxiang Xing ,  Xinhui Duan ,  Yuanjing Li ,  Yinong Liu ,  Qingping Huang

IPC分类号： A61B6/00 ,  G01N23/04

CPC分类号： G01V5/005 ,  G01V5/0041

摘要： Disclosed is an image reconstruction method in a high-energy dual-energy CT system. The method comprises steps of scanning an objection with high-energy dual-energy rays to obtain high-energy dual-energy projection values, calculating projection values of base material coefficients corresponding to the dual-energy projection values on the basis of a pre-created lookup table or by analytically solving a set of equations, and obtaining an image of base material coefficient distribution based on the projection values of base material coefficients. The method provides a solution for reconstruction with high-energy dual energy CT technology and thus a more effective approach for substance identification and contraband inspection, thereby bringing a significant improvement on accuracy and efficiency in security inspection.

摘要翻译： 公开了一种高能双能CT系统中的图像重建方法。 该方法包括以高能双能量射线扫描异物以获得高能双能量投影值的步骤，基于预先创建的计算来计算对应于双能量投影值的基材系数的投影值 查找表或通过分析求解一组方程，并且基于基材系数的投影值获得基材系数分布的图像。 该方法为高能双能CT技术的重建提供了解决方案，是物质识别和违禁检测的有效途径，从而大大提高了安全检测的准确性和效率。

公开(公告)号：US07945017B2

公开(公告)日：2011-05-17

申请号：US12240049

申请日：2008-09-29

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

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

IPC分类号： G01N23/06

CPC分类号： G01N23/10 ,  A61B6/027 ,  G01N23/046 ,  G01N2001/022 ,  G01N2223/419 ,  G01N2223/423 ,  G01N2223/637 ,  G01N2223/639 ,  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 there are drugs concealed in the inspected liquid article based on the difference between the acquired physical attributes and reference physical attributes of the inspected liquid article. 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; 并且基于被检查的液体制品的所获取的物理属性和参考物理属性之间的差异来确定在被检查的液体制品中是否存在隐藏的药物。 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。

公开(公告)号：US07881424B2

公开(公告)日：2011-02-01

申请号：US12075463

申请日：2008-03-11

申请人： Li Zhang ,  Zhiqiang Chen ,  Gnowei Zhang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

发明人： Li Zhang ,  Zhiqiang Chen ,  Gnowei Zhang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

IPC分类号： G01N23/00

CPC分类号： G01T7/005 ,  G01T1/1648

摘要： A method for calibrating a dual-energy CT system and an image reconstruction method are disclosed to calculate images of atomic number and density of a scanned object as well as its attenuation coefficient images at any energy level. The present invention removes the effect from a cupping artifact due to X-ray beam hardening. The method for calibrating a dual-energy CT system is provided comprising steps of selecting at least two different materials, detecting penetrative rays from dual-energy rays penetrating said at least two different materials under different combinations of thickness to acquire projection values, and creating a lookup table in a form of correspondence between said different combinations of thickness and said projection values. The image reconstruction method is provided comprising steps of scanning an object with dual-energy rays to acquire dual-energy projection values, calculating projection values of base material coefficients corresponding to said dual-energy projection values based on a pre-created lookup table, and reconstructing an image of base material coefficient distribution based on said projection values of base material coefficients. In this way, images of atomic number and density of an object as well as its attenuation coefficient images can be calculated from the images of the distribution of base material coefficients. Compared with the prior art technique, the method proposed in the present invention has advantages of simple calibration procedure, high calculation precision and invulnerability to X-ray beam hardening.

摘要翻译： 公开了用于校准双能量CT系统和图像重建方法的方法，以计算被扫描物体的原子序数和密度以及其在任何能级的衰减系数图像的图像。 本发明消除了由于X射线束硬化引起的拔罐伪影的影响。 提供了一种用于校准双能量CT系统的方法，包括以下步骤：选择至少两种不同的材料，从不同厚度的组合穿透所述至少两种不同材料的双能量射线检测穿透射线，以获得投影值， 以所述不同的厚度组合和所述投影值之间的对应形式的查找表。 提供了图像重建方法，包括以下步骤：用双能量射线扫描物体以获取双能量投影值，基于预先创建的查找表计算与所述双能量投影值相对应的基材系数的投影值，以及 基于所述基材系数的投影值重构基材系数分布的图像。 以这种方式，可以从基材系数分布的图像中计算出物体的原子数和密度以及衰减系数图像的图像。 与现有技术相比，本发明提出的方法具有校准过程简单，计算精度高，X射线束硬化无效的优点。

公开(公告)号：US20080310598A1

公开(公告)日：2008-12-18

申请号：US12075463

申请日：2008-03-11

申请人： Li Zhang ,  Zhiqiang Chen ,  Guowei Zhang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

发明人： Li Zhang ,  Zhiqiang Chen ,  Guowei Zhang ,  Jianping Cheng ,  Yuanjing Li ,  Yinong Liu ,  Yuxiang Xing ,  Ziran Zhao ,  Yongshun Xiao

IPC分类号： G01D18/00 ,  G06K9/00

CPC分类号： G01T7/005 ,  G01T1/1648

摘要： A method for calibrating a dual-energy CT system and an image reconstruction method are disclosed to calculate images of atomic number and density of a scanned object as well as its attenuation coefficient images at any energy level. The present invention removes the effect from a cupping artifact due to X-ray beam hardening. The method for calibrating a dual-energy CT system is provided comprising steps of selecting at least two different materials, detecting penetrative rays from dual-energy rays penetrating said at least two different materials under different combinations of thickness to acquire projection values, and creating a lookup table in a form of correspondence between said different combinations of thickness and said projection values. The image reconstruction method is provided comprising steps of scanning an object with dual-energy rays to acquire dual-energy projection values, calculating projection values of base material coefficients corresponding to said dual-energy projection values based on a pre-created lookup table, and reconstructing an image of base material coefficient distribution based on said projection values of base material coefficients. In this way, images of atomic number and density of an object as well as its attenuation coefficient images can be calculated from the images of the distribution of base material coefficients. Compared with the prior art technique, the method proposed in the present invention has advantages of simple calibration procedure, high calculation precision and invulnerability to X-ray beam hardening.

摘要翻译： 公开了用于校准双能量CT系统和图像重建方法的方法，以计算被扫描物体的原子序数和密度以及其在任何能级的衰减系数图像的图像。 本发明消除了由于X射线束硬化引起的拔罐伪影的影响。 提供了一种用于校准双能量CT系统的方法，包括以下步骤：选择至少两种不同的材料，从不同厚度的组合穿透所述至少两种不同材料的双能量射线检测穿透射线，以获得投影值， 以所述不同的厚度组合和所述投影值之间的对应形式的查找表。 提供了图像重建方法，包括以下步骤：用双能量射线扫描物体以获取双能量投影值，基于预先创建的查找表计算与所述双能量投影值相对应的基材系数的投影值，以及 基于所述基材系数的投影值重构基材系数分布的图像。 以这种方式，可以从基材系数分布的图像中计算出物体的原子数和密度以及衰减系数图像的图像。 与现有技术相比，本发明提出的方法具有校准过程简单，计算精度高，X射线束硬化无效的优点。

公开(公告)号：US07424089B2

公开(公告)日：2008-09-09

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

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。

公开(公告)号：US20060291742A1

公开(公告)日：2006-12-28

申请号：US11472193

申请日：2006-06-21

申请人： Li Zhang ,  Zhiqiang Chen ,  Yuxiang Xing ,  Yuanjing Li ,  Yinong Liu ,  Ziran Zhao ,  Yongshun Xiao

发明人： Li Zhang ,  Zhiqiang Chen ,  Yuxiang Xing ,  Yuanjing Li ,  Yinong Liu ,  Ziran Zhao ,  Yongshun Xiao

IPC分类号： G06K9/40 ,  G06K9/00

CPC分类号： G06T5/40 ,  G06T5/009 ,  G06T2207/10116 ,  G06T2207/30004

摘要： A method of image information enhancement in radiography relates to image information processing techniques in radiography. The method comprising steps of: normalizing an acquired image A(x,y) to form a normalized image B(x,y); filtering the normalized image B(x,y) by a low-pass filter to obtain an filtered image C(x,y); calculating a relative standard deviation for each pixel in the image A(x,y), three times the relative standard deviation being an edge threshold for each pixel; thresholding a difference image obtained by subtracting the filtered image C(x,y) from the normalized image B(x,y) by using the edge threshold for each pixel to form a threshold-processed image D(x,y); enhancing a contrast of the threshold-processed image D(x,y) by using a non-linear function to form a contrast-enhanced image E(x,y); determining a enhancement coefficient a(x,y); obtaining a edge-enhanced image F(x,y) by multiplying the enhancement coefficient a(x,y), the contrast-enhanced image E(x,y) and the filtered image C(x,y); and generating a resulting image by multiplying a sum of the edge-enhanced image F(x,y) and the filtered image C(x,y) with the maximum value Amax As compared with the prior arts, the inventive method has a fast processing speed for image information enhancement and a simple algorithm, images clearly, eliminates noises in the images, and satisfies the requirements of relatively more enhancement to the contrast of the dark regions in the scanned images.

摘要翻译： 射线照相术中图像信息增强的方法涉及放射照相术中的图像信息处理技术。 该方法包括以下步骤：归一化所获取的图像A（x，y）以形成归一化图像B（x，y）; 通过低通滤波器对归一化图像B（x，y）进行滤波，得到滤波图像C（x，y）; 计算图像A（x，y）中每个像素的相对标准偏差，相对标准偏差的三倍是每个像素的边缘阈值; 通过使用每个像素的边缘阈值来从归一化图像B（x，y）中减去滤波图像C（x，y）获得的差分图像，以形成阈值处理图像D（x，y）; 通过使用非线性函数来增强阈值处理图像D（x，y）的对比度，以形成对比度增强图像E（x，y）; 确定增强系数a（x，y）; 通过将增强系数a（x，y），对比度增强图像E（x，y）和滤波图像C（x，y）相乘来获得边缘增强图像F（x，y） 并且通过将边缘增强图像F（x，y）和滤波图像C（x，y）的和乘以最大值A最大值来产生所得到的图像。与现有技术相比， 本发明的方法具有图像信息增强的快速处理速度和简单的算法，图像清晰，消除了图像中的噪声，并且满足了对扫描图像中的暗区域的对比度相对更加增强的要求。

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。