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公开(公告)号：US08039803B2
公开(公告)日：2011-10-18
申请号：US12920161
申请日：2009-02-16
申请人： Kejun Kang , Zhiqiang Chen , Li Zhang , Yingxin Wang , Ziran Zhao , Yuanjing Li , Yinong Liu , Zhifeng Huang , Yuxiang Xing
发明人： Kejun Kang , Zhiqiang Chen , Li Zhang , Yingxin Wang , Ziran Zhao , Yuanjing Li , Yinong Liu , Zhifeng Huang , Yuxiang Xing
IPC分类号： G01J5/02
CPC分类号： G01N21/3581
摘要： A method for phase contrast imaging comprises: illuminating an object by terahertz radiation such that the terahertz radiation interacts with the object; illuminating a diffraction grating by the terahertz radiation that has interacted with the object; translating the diffraction grating along the direction of the grating wave vector, to measure, for each of different grating positions, an intensity distribution of the terahertz radiation that has interacted with the object and with the grating in a diffraction field; and retrieving a phase contrast image of the object from the intensity distributions. An apparatus for phase contrast imaging is also provided.
摘要翻译： 一种用于相位对比成像的方法包括：用太赫兹辐射照射物体，使得太赫兹辐射与物体相互作用; 用与物体相互作用的太赫兹辐射照射衍射光栅; 沿着光栅波矢的方向平移衍射光栅，以测量每个不同的光栅位置，在衍射场中与物体和光栅相互作用的太赫兹辐射的强度分布; 以及从所述强度分布中检索所述对象的相位对比图像。 还提供了一种用于相位成像的装置。
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公开(公告)号：US20110024624A1
公开(公告)日：2011-02-03
申请号：US12920161
申请日：2009-02-16
申请人： Kejun Kang , Zhiqiang Chen , Li Zhang , Yingxin Wang , Ziran Zhao , Yuanjing Li , Yinong Liu , Zhifeng Huang , Yuxiang Xing
发明人： Kejun Kang , Zhiqiang Chen , Li Zhang , Yingxin Wang , Ziran Zhao , Yuanjing Li , Yinong Liu , Zhifeng Huang , Yuxiang Xing
IPC分类号： H01L31/09 , H01L31/0232
CPC分类号： G01N21/3581
摘要： A method for phase contrast imaging comprises: illuminating an object by terahertz radiation such that the terahertz radiation interacts with the object; illuminating a diffraction grating by the terahertz radiation that has interacted with the object; translating the diffraction grating along the direction of the grating wave vector, to measure, for each of different grating positions, an intensity distribution of the terahertz radiation that has interacted with the object and with the grating in a diffraction field; and retrieving a phase contrast image of the object from the intensity distributions. An apparatus for phase contrast imaging comprises: a terahertz radiation emitter for generating terahertz radiation, which illuminates an object to interact with the object; a diffraction grating, which is illuminated by the terahertz radiation that has interacted with the object; a terahertz radiation detector for measuring, for each of different grating positions, an intensity distribution of the terahertz radiation that has interacted with the object and with the grating in a diffraction field; and a data collecting and processing system for retrieving a phase contrast image of the object from the intensity distributions.
摘要翻译： 一种用于相位对比成像的方法包括：用太赫兹辐射照射物体，使得太赫兹辐射与物体相互作用; 用与物体相互作用的太赫兹辐射照射衍射光栅; 沿着光栅波矢的方向平移衍射光栅，以测量每个不同的光栅位置，在衍射场中与物体和光栅相互作用的太赫兹辐射的强度分布; 以及从所述强度分布中检索所述对象的相位对比图像。 用于相位对比成像的装置包括：太赫兹辐射发射器，用于产生太赫兹辐射，其照亮物体与物体相互作用; 衍射光栅，其被与物体相互作用的太赫兹辐射照射; 太赫兹辐射检测器，用于针对每个不同的光栅位置，在衍射场中测量与物体和光栅相互作用的太赫兹辐射的强度分布; 以及用于从强度分布中检索对象的相位对比图像的数据收集和处理系统。
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公开(公告)号：US20120106832A1
公开(公告)日：2012-05-03
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
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。
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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
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。
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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。
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公开(公告)号：US09134259B2
公开(公告)日：2015-09-15
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
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。
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公开(公告)号：US08515002B2
公开(公告)日：2013-08-20
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： A61B6/00
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。
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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。
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