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11. 发明授权

US07945017B2 Method and device for inspection of liquid articles 有权
标题翻译：液体制品检验方法及装置
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。

12. 发明授权

US07881424B2 Method for calibrating dual-energy CT system and method of image reconstruction 有权
标题翻译：校准双能CT系统的方法和图像重建方法
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。

13. 发明申请

US20080310598A1 Method for calibrating dual-energy CT system and method of image reconstruction 有权
标题翻译：校准双能CT系统的方法和图像重建方法
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。

14. 发明授权

US07424089B2 System and method for reconstructing image by using straight-line trajectory scan 有权
标题翻译：使用直线轨迹扫描重建图像的系统和方法
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。

15. 发明申请

US20060291742A1 Method and apparatus for enhancing image acquired by radiographic system 有权
标题翻译：用于增强由放射摄影系统获取的图像的方法和装置
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。

16. 发明授权

US08724889B2 Method and apparatus for CT image reconstruction 有权
标题翻译： CT图像重建方法和装置
公开(公告)号：US08724889B2
公开(公告)日：2014-05-13
申请号：US13140761
申请日：2011-05-11
申请人： Liang Li , Zhiqiang Chen , Li Zhang , Kejun Kang , Yuxiang Xing , Ziran Zhao , Yongshun Xiao , Zhifeng Huang
发明人： Liang Li , Zhiqiang Chen , Li Zhang , Kejun Kang , Yuxiang Xing , Ziran Zhao , Yongshun Xiao , Zhifeng Huang
IPC分类号： G06K9/00 , A61B6/00 , G01N23/00 , G21K1/12 , H05G1/60
CPC分类号： G06T11/006 , G06T2211/421
摘要： A method and apparatus for CT image reconstruction may include selecting, by a unit, projection data of the same height on a curve having a curvature approximate to that of the scanning circular orbit, implementing, by a unit, a weighting processing on the selected projection data, filtering, by a unit, the weighting processed projection data along a horizontal direction, implementing, by a unit, three-dimensional back projection on the filtered projection data along the direction of ray. The method and apparatus can effectively eliminate cone beam artifact under a large cone angle.
摘要翻译：用于CT图像重建的方法和装置可以包括以单位选择具有接近于扫描圆形轨道的曲率的曲线上具有相同高度的投影数据，由单元实现对所选投影的加权处理数据，单位滤波沿着水平方向的加权处理的投影数据，通过一个单元沿着沿着光线的方向实现对经滤波的投影数据的三维反投影。该方法和装置可以有效地消除大锥角下的锥束伪影。

17. 发明申请

US20120014579A1 CT DEVICE AND METHOD BASED ON MOTION COMPENSATION 有权
标题翻译：基于运动补偿的CT装置和方法
公开(公告)号：US20120014579A1
公开(公告)日：2012-01-19
申请号：US13142725
申请日：2010-12-27
申请人： Liang Li , Zhiqiang Chen , Li Zhang , Kejun Kang , Yuanjing Li , Ziran Zhao , Yinong Liu , Yuxiang Xing , Xin Jin
发明人： Liang Li , Zhiqiang Chen , Li Zhang , Kejun Kang , Yuanjing Li , Ziran Zhao , Yinong Liu , Yuxiang Xing , Xin Jin
IPC分类号： G06K9/00
CPC分类号： A61B6/5264 , A61B6/032 , G06T7/285 , G06T11/005 , G06T2207/10081 , G06T2211/412
摘要： A CT device and method based on motion compensation are proposed. The present invention obtains motion parameters of a target object by using a stereo-vision-based motion measurement system, and then implements motion compensation through the technology based on reconstructed image matrix transformation, thereby obtaining a clear 2D/3D CT image while eliminating motion artifacts. The present invention can effectively eliminate motion artifacts caused by the scanned object's own motions in the CT scanning, and can be easily embedded into the existing CT scanning equipments. The present invention can improve quality of the CT images, and is especially important for CT imaging of some special groups of people that can not control their own motions, such as Parkinson's patients, infants, living mouse and so on. It can also improve ultra-high-resolution imaging of human body.
摘要翻译：提出了一种基于运动补偿的CT装置和方法。本发明通过使用基于立体视觉的运动测量系统获得目标对象的运动参数，然后通过基于重构图像矩阵变换的技术实现运动补偿，从而获得清晰的2D / 3D CT图像，同时消除运动伪影。本发明能够有效地消除CT扫描中被扫描物体自身运动引起的运动伪影，并且可以容易地嵌入现有的CT扫描设备中。本发明可以提高CT图像的质量，对于一些不能控制自己的运动的特殊人群，如帕金森患者，婴儿，生活小鼠等，对CT成像尤为重要。它还可以改善人体的超高分辨率成像。

18. 发明申请

US20110293064A1 X-RAY DARK-FIELD IMAGING SYSTEM AND METHOD 有权
标题翻译： X射线暗场成像系统及方法
公开(公告)号：US20110293064A1
公开(公告)日：2011-12-01
申请号：US13147952
申请日：2010-07-06
申请人： Zhifeng Huang , Zhiqiang Chen , Li Zhang , Zhentian Wang , Yuxiang Xing , Ziran Zhao , Yongshun Xiao
发明人： Zhifeng Huang , Zhiqiang Chen , Li Zhang , Zhentian Wang , Yuxiang Xing , Ziran Zhao , Yongshun Xiao
IPC分类号： A61B6/03 , G01N23/201
CPC分类号： G01N23/04 , B82Y10/00 , G01N23/20075 , G21K2201/061 , G21K2207/005
摘要： An x-ray imaging technology, performing an x-ray dark-field CT imaging of an examined object using an imaging system which comprises an x-ray source, two absorbing gratings G1 and G2, an x-ray detector, a controller and a data processing unit, comprising the steps of: emitting x-rays to the examined object; enabling one of the two absorbing gratings G1 and G2 to perform phase stepping motion within at least one period range thereof; where in each phase stepping step, the detector receives the x-ray and converts it into an electric signal; wherein through the phase stepping of at least one period, the x-ray intensity at each pixel point on the detector is represented as an intensity curve; calculating a second moment of scattering angle distribution for each pixel, based on a contrast of the intensity curve at each pixel point on the detector and an intensity curve without presence of the examined object; taking images of the object at various angles, then obtaining an image with scattering information of the object in accordance with a CT reconstruction algorithm.
摘要翻译：一种X射线成像技术，使用包括x射线源，两个吸收光栅G1和G2，x射线检测器，控制器和控制器的成像系统对检查对象进行X射线暗场CT成像数据处理单元，包括以下步骤：向被检查对象发射X射线; 使得两个吸收光栅G1和G2中的一个能够在其至少一个周期范围内执行相位步进运动; 在每个相位步进步骤中，检测器接收x射线并将其转换为电信号; 其中通过至少一个周期的相位步进，将检测器上每个像素点处的x射线强度表示为强度曲线; 基于检测器上的每个像素点处的强度曲线的对比度和不存在检查对象的强度曲线，计算每个像素的散射角分布的第二时刻; 以各种角度拍摄对象的图像，然后根据CT重建算法获得具有对象的散射信息的图像。

19. 发明授权

US08036337B2 Method and device for inspection of liquid articles 有权
标题翻译：液体制品检验方法及装置
公开(公告)号：US08036337B2
公开(公告)日：2011-10-11
申请号：US12238515
申请日：2008-09-26
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。

20. 发明授权

US07962283B2 Deviation-correction system for positioning of moving objects and motion tracking method thereof 有权
标题翻译：用于移动物体定位的偏差校正系统及其运动跟踪方法
公开(公告)号：US07962283B2
公开(公告)日：2011-06-14
申请号：US11644137
申请日：2006-12-22
申请人： Li Zhang , Zhiqiang Chen , Lijun Wang , Zhiming Wang , Ziran Zhao , Yuxiang Xing , Yongshun Xiao , Yuanjing Li , Yinong Liu
发明人： Li Zhang , Zhiqiang Chen , Lijun Wang , Zhiming Wang , Ziran Zhao , Yuxiang Xing , Yongshun Xiao , Yuanjing Li , Yinong Liu
IPC分类号： G01C21/30 , G01C21/32
CPC分类号： G05D1/0246 , G05D2201/0216
摘要： The present invention relates to the deviation-correction system for positioning of moving objects, and discloses a deviation-correction system for positioning of moving objects and the motion-tracking method thereof. The system includes a control system for receiving motion parameters required for deviation-correction, and sending commands to an actuator to control a moving object based on the motion parameters, the deviation-correction system for positioning of moving objects further comprising: a reference object which is set as a specified motion trail for the moving object; an image capturing system for acquiring successive digital image data upon the moving object moves; a motion tracking system for performing a motion tracking algorithm based on the digital image data transmitted by the image capturing system to judge whether the current motion state needs to be corrected and then transmitting the motion parameters required for deviation-correction to the control system.
摘要翻译：本发明涉及用于移动物体的定位的偏差校正系统，并且公开了用于移动物体的定位的偏差校正系统及其运动跟踪方法。该系统包括用于接收偏差校正所需的运动参数的控制系统，以及基于运动参数向致动器发送命令以控制运动物体的运动对象的偏移校正系统，还包括：参考对象，被设置为移动物体的指定运动轨迹; 用于在移动物体移动时获取连续的数字图像数据的图像捕获系统; 运动跟踪系统，用于基于由图像捕获系统发送的数字图像数据执行运动跟踪算法，以判断当前运动状态是否需要被校正，然后向控制系统发送偏差校正所需的运动参数。

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