公开(公告)号：EP2453226A1

公开(公告)日：2012-05-16

申请号：EP10796655.8

申请日：2010-07-06

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： HUANG, Zhifeng ,  CHEN, Zhiqiang ,  ZHANG, Li ,  WANG, Zhentian ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

IPC分类号： G01N23/04 ,  G02B27/50

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，控制器和成像系统的成像系统对被检查物体进行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。

公开(公告)号：EP2273257B1

公开(公告)日：2018-11-21

申请号：EP09733473.4

申请日：2009-04-01

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： ZHANG, Li ,  LIU, Yinong ,  CHEN, Zhiqiang ,  LI, Yuanjing ,  GAO, Hewei ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

IPC分类号： G01N23/04 ,  G01V5/00

CPC分类号： G01V5/005 ,  G01B15/00 ,  G01V5/0016 ,  G03B42/00

摘要： A linear track scanning imaging system and method, the imaging system comprising: a ray generating unit comprising a plurality of ray sources, where the plurality of ray sources emit beams alternately and only one ray source emits a beam at a same time; an actuating means for causing an object under examination to perform a relative movement with respect to the linear track scanning system along a linear track, thereby leading the object under examination to pass through the scanning area of the linear track scanning imaging system; a data collecting unit which collects the projection data of the object under examination for each ray source respectively; an imaging unit which reconstructs an image of the object under examination based on the projection data collected for each ray source; and a display unit for displaying the reconstructed image. By adopting a plurality of ray sources arranged according to a certain spatial distribution and emitting beams alternately according to a certain time sequence, it is possible to achieve a larger scanning viewing angle with a shorter detector length, thereby reducing the number of the detector units required by the system and shortening the total scanning distance of the examined object.

公开(公告)号：EP2453226B1

公开(公告)日：2016-10-26

申请号：EP10796655.8

申请日：2010-07-06

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： HUANG, Zhifeng ,  CHEN, Zhiqiang ,  ZHANG, Li ,  WANG, Zhentian ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

IPC分类号： G01N23/20 ,  G01N23/04 ,  B82Y10/00

CPC分类号： G01N23/04 ,  B82Y10/00 ,  G01N23/20075 ,  G21K2201/061 ,  G21K2207/005

公开(公告)号：EP3242126A1

公开(公告)日：2017-11-08

申请号：EP15875158.6

申请日：2015-12-23

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： LI, Liang ,  CHEN, Zhiqiang ,  KANG, Kejun ,  ZHANG, Li ,  ZHAO, Ziran ,  XING, Yuxiang ,  XIAO, Yongshun ,  GU, Jianping ,  ZHENG, Juan

IPC分类号： G01N23/04

CPC分类号： G06T11/003 ,  G01N23/04 ,  G06T7/0002 ,  G06T11/008 ,  G06T2207/10081 ,  G06T2207/30112 ,  G06T2211/408

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.

摘要翻译： 公开了一种双能量射线成像方法和系统。 该方法包括：利用校准后的表面拟合方法计算两种材料重叠区域内材料的质量厚度，然后将该像素的一对原始高能量和低能量数据分解为两个高低能量数据， 对应于两种材料的能量数据集，最后计算并获取每个像素的不同材料的成分结果。 本发明特别有利的是，可以消除由于两种重叠材料导致的材料误差识别问题，并且可以实现多种材料的分层成像，从而提高了物质识别的准确性并降低了假阳性率和 这对于安检和缉私领域的应用非常重要。

公开(公告)号：EP1953700B1

公开(公告)日：2012-05-02

申请号：EP06791243.6

申请日：2006-10-11

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： ZHANG, Li ,  GAO, Hewei ,  CHEN, Zhiqiang ,  KANG, Kejun ,  CHENG, Jianping ,  LI, Yuanjing ,  LIU, Yinong ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

IPC分类号： G06T11/00 ,  A61B6/03

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

摘要： The present invention discloses a system and method for reconstructing an image by rectilinear trajectory scanning, to prevent the image resolution from reducing due to interpolations in angle direction and detector direction while rearranging data. The system includes: a projection data converter for converting the projection data scanned by rectilinear trajectory into the projection data scanned by quasi-parallel beam, a filter for achieving filtered projection data by convolution of a predetermined convolution function kernel and the projection data scanned by quasi-parallel beam, and backprojection means for reconstructing the image by applying weighted backprojection to the filtered projection data. The system and method of the present invention improves the image reconstruction resolution and reduces the influence of data truncation to the image reconstruction. The present invention has some common advantages of the filtered backprojection in the form of the filtered backprojection, such as fast reconstruction and easy simultaneous operation and acceleration etc.

公开(公告)号：EP2469472A1

公开(公告)日：2012-06-27

申请号：EP11743411.8

申请日：2011-05-11

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： LI, Liang ,  CHEN, Zhiqlang ,  ZHANG, Li ,  KANG, Kejun ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun ,  HUANG, Zhifeng

IPC分类号： G06T11/00

CPC分类号： G06T11/006 ,  G06T2211/421

摘要： The invention discloses a method and apparatus for CT image reconstruction. The method for CT image reconstruction of the present invention comprises the steps of: selecting projection data of the same height on a curve having a curvature approximate to that of the scanning circular orbit; implementing weighting processing on the selected projection data; filtering the weighting processed projection data along the horizontal direction; implementing three-dimensional back projection on the filtered projection data along the direction of ray. The apparatus for CT image reconstruction of the present invention comprises a rebinning unit, a weighting unit, a filtering unit and a back projection unit. Employment of the technical solution of the invention can effectively eliminate cone beam artifact under a large cone angle.

摘要翻译： 本发明公开了一种CT图像重建方法和装置。 本发明的CT图像重建方法包括以下步骤：在具有近似于扫描圆形轨道的曲率的曲线上选择相同高度的投影数据; 对所选择的投影数据实施加权处理; 沿着水平方向对加权处理的投影数据进行滤波; 在沿着射线方向的滤波投影数据上实现三维反投影。 本发明的CT图像重构装置包括重组单元，加权单元，滤波单元和背投影单元。 采用本发明的技术方案可以有效地消除大锥角下的锥束伪影。

公开(公告)号：EP2273257A1

公开(公告)日：2011-01-12

申请号：EP09733473.4

申请日：2009-04-01

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： ZHANG, Li ,  LIU, Yinong ,  CHEN, Zhiqiang ,  LI, Yuanjing ,  GAO, Hewei ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

IPC分类号： G01N23/04 ,  G01N23/08 ,  G01V5/00

CPC分类号： G01V5/005 ,  G01B15/00 ,  G01V5/0016 ,  G03B42/00

摘要： A linear track scanning imaging system and method, the imaging system comprising: a ray generating unit comprising a plurality of ray sources, where the plurality of ray sources emit beams alternately and only one ray source emits a beam at a same time; an actuating means for causing an object under examination to perform a relative movement with respect to the linear track scanning system along a linear track, thereby leading the object under examination to pass through the scanning area of the linear track scanning imaging system; a data collecting unit which collects the projection data of the object under examination for each ray source respectively; an imaging unit which reconstructs an image of the object under examination based on the projection data collected for each ray source; and a display unit for displaying the reconstructed image. By adopting a plurality of ray sources arranged according to a certain spatial distribution and emitting beams alternately according to a certain time sequence, it is possible to achieve a larger scanning viewing angle with a shorter detector length, thereby reducing the number of the detector units required by the system and shortening the total scanning distance of the examined object.

公开(公告)号：EP1953700A1

公开(公告)日：2008-08-06

申请号：EP06791243.6

申请日：2006-10-11

申请人： Tsinghua University ,  Nuctech Company Limited

发明人： ZHANG, Li ,  GAO, Hewei ,  CHEN, Zhiqiang ,  KANG, Kejun ,  CHENG, Jianping ,  LI, Yuanjing ,  LIU, Yinong ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

IPC分类号： G06T11/00 ,  A61B6/03

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： 它是游离缺失盘的系统和用于通过使用直线轨迹扫描，以避免图像的空间分辨率降低重建的图像的方法，由于数据重排期间在角度方向和方向检测器的内插。 该系统包括：用于从直线轨迹变换的投影数据的投影数据转换部分扫描到投影数据下准平行光束扫描; 用于通过卷积下准平行光束投影数据与预定的卷积内核扫描获得经滤波的投影数据的过滤部; 和用于通过反投影用的加权因子的滤波的投影数据重建图像的背投影部。 通过使用本发明的系统和方法，在重构图像中的空间分辨率得到改善，并且重建的图像上的数据截断的影响被降低。 本发明适用的过滤和反投影模式，并由此具有过滤和反投影，颜色的一般优点：如简单和效率。 而且很容易被并行化和加速。