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11.发明申请METHODS AND SYSTEMS FOR IMPROVING SPATIAL AND TEMPORAL RESOLUTION OF COMPUTED IMAGES OF MOVING OBJECTS 有权改善移动物体计算图像空间和时间分辨率的方法与系统公开(公告)号：US20080304726A1
公开(公告)日：2008-12-11
申请号：US11758166
申请日：2007-06-05
申请人： Jeffrey Allen Fessler , Charles Addison Bouman , Jiang Hsieh , Jean-Baptiste Daniel Marie Thibault , Ken David Sauer , Samit Kumar Basu , Bruno Kristiaan Bernard De Man
发明人： Jeffrey Allen Fessler , Charles Addison Bouman , Jiang Hsieh , Jean-Baptiste Daniel Marie Thibault , Ken David Sauer , Samit Kumar Basu , Bruno Kristiaan Bernard De Man
CPC分类号： A61B6/032 , A61B6/037 , G06T11/006 , G06T2211/412 , G06T2211/424
摘要： A method of improving a resolution of an image using image reconstruction is provided. The method includes acquiring scan data of an object and forward projecting a current image estimate of the scan data to generate calculated projection data. The method also includes applying a data-fit term and a regularization term to the scan data and the calculated projection data and modifying at least one of the data fit term and the regularization term to accommodate spatio-temporal information to form a reconstructed image from the scan data and the calculated projection data.
摘要翻译： 提供了一种使用图像重建来提高图像分辨率的方法。 该方法包括获取对象的扫描数据并向前投影扫描数据的当前图像估计以产生计算出的投影数据。 该方法还包括将数据拟合项和正则化项应用于扫描数据和计算出的投影数据，并修改数据拟合项和正则化项中的至少一个，以适应时空信息，以形成来自 扫描数据和计算出的投影数据。
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12.发明授权Method and system for CT imaging using a distributed X-ray source and interpolation based reconstruction 有权使用分布式X射线源和基于插值的重建进行CT成像的方法和系统公开(公告)号：US07227923B2
公开(公告)日：2007-06-05
申请号：US11108419
申请日：2005-04-18
CPC分类号： A61B6/4028 , A61B6/032 , A61B6/4085 , H05G1/52
摘要： A method for Computed Tomography (CT) imaging is provided. The method comprises rotating a gantry at a substantially slow rotation speed about a volume of interest. The gantry comprises a combination of X-ray source points. The X-ray source points comprise one or more discrete emission points and an arc of discrete or continuous X-ray source points. The method then comprises obtaining projection data from the combination of X-ray source points and performing a suitable reconstruction based on the projection data obtained from the combination of X-ray source points, to generate one or more reconstructed images.
摘要翻译： 提供了一种计算机断层成像（CT）成像的方法。 该方法包括以基本上慢的旋转速度围绕感兴趣的体积旋转台架。 龙门架包括X射线源点的组合。 X射线源点包括离散或连续的X射线源点的一个或多个离散发射点和弧。 然后，该方法包括从X射线源点的组合获得投影数据，并且基于从X射线源点的组合获得的投影数据执行适当的重建，以生成一个或多个重建图像。
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公开(公告)号：US07203267B2
公开(公告)日：2007-04-10
申请号：US10880875
申请日：2004-06-30
IPC分类号： G01N23/00
CPC分类号： G06T11/006 , G06T2211/424
摘要： A technique is provided for CT reconstruction for use in CT metrology. The boundary based CT reconstruction method includes the steps of initializing a boundary of an object to obtain a boundary estimate, defining a forward model based on the boundary estimate, linearizing the forward model to obtain a system matrix and implementing an iterative image reconstruction process using the system matrix to update the boundary estimate.
摘要翻译： 提供CT重建技术用于CT计量。 基于边界的CT重建方法包括初始化对象边界以获得边界估计的步骤，基于边界估计定义正向模型，将前向模型线性化以获得系统矩阵，并使用该方法实现迭代图像重建过程 系统矩阵来更新边界估计。
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14.发明授权Methods and apparatus for image reconstruction in distributed x-ray source CT systems 有权分布式X射线源CT系统中图像重建的方法与装置公开(公告)号：US06937689B2
公开(公告)日：2005-08-30
申请号：US10704179
申请日：2003-11-07
IPC分类号： A61B6/03
CPC分类号： A61B6/4014 , A61B6/032 , A61B6/4085 , Y10S378/901
摘要： A method for imaging an object that includes utilizing a computed tomography imaging apparatus having a distributed x-ray source to acquire samples of projection data of an object in angular and temporal space utilizing a predetermined sampling lattice. Acquired projection data is filtered utilizing a two-dimensional linear filter to produce filtered data, and the filtered data is then backprojected to obtain a reconstructed image of the object.
摘要翻译： 一种用于成像对象的方法，包括利用具有分布式x射线源的计算机断层摄影成像设备，以利用预定的采样点获取角度和时间空间中的对象的投影数据的采样。 利用二维线性滤波器对获取的投影数据进行滤波以产生滤波数据，然后反过来的数据被反投影以获得对象的重建图像。
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公开(公告)号：US09237873B2
公开(公告)日：2016-01-19
申请号：US13285953
申请日：2011-10-31
CPC分类号： A61B6/032 , A61B6/5205 , A61B6/5258 , G06T11/005 , G06T2211/432
摘要： A system and method for CT projection extrapolation are provided. The method comprises receiving a CT projection for extrapolation. The method also comprises selecting a target patch comprising at least one pixel of a row to be extrapolated. The method further comprises generating a correlation profile between the target patch and one or more source patches, wherein the source patches comprise measured pixels in the CT projection in one or more rows adjacent to the target patch. The projection data is generated for at least one pixel of the target patch based on the correlation profile and the measured pixels of at least one of the source patches.
摘要翻译： 提供了一种用于CT投影外插的系统和方法。 该方法包括接收用于外推的CT投影。 该方法还包括选择包括要外推的行的至少一个像素的目标补丁。 所述方法还包括在所述目标贴片和一个或多个源贴片之间产生相关曲线，其中所述源贴片包括所述CT投影中与所述目标贴片相邻的一行或多行中的测量像素。 基于相关分布和至少一个源补丁的测量像素，为目标补丁的至少一个像素生成投影数据。
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公开(公告)号：US08897528B2
公开(公告)日：2014-11-25
申请号：US13174461
申请日：2011-06-30
CPC分类号： G01N23/046 , A61B6/03 , G01N2223/419 , G06T11/006 , G06T2211/424
摘要： Methods are provided for iteratively reconstructing an image signal to generate a reconstructed image signal. In one embodiment, sub-iterations of each iteration are performed on pixel or voxel subsets. The subsets may be composed of neighboring or spatially separated pixel or voxels and may extend in the z-direction. In one embodiment, an update step of the iterative reconstruction involves the direct inversion of an approximation of a Hessian matrix associated with the respective subsets. In further embodiments, non-negativity or other limitations or constraints on update values may be enforced.
摘要翻译： 提供了用于迭代重建图像信号以产生重建图像信号的方法。 在一个实施例中，对像素或体素子集执行每次迭代的子迭代。 子集可以由相邻或空间上分离的像素或体元组成，并且可以在z方向上延伸。 在一个实施例中，迭代重建的更新步骤包括与相应子集相关联的Hessian矩阵的近似的直接反转。 在另外的实施例中，可以执行非消极性或对更新值的其他限制或限制。
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公开(公告)号：US08885975B2
公开(公告)日：2014-11-11
申请号：US13531082
申请日：2012-06-22
申请人： Zhou Yu , Bruno Kristiaan Bernard De Man , Jean-Baptiste Thibault , Debashish Pal , Lin Fu , Charles A. Bouman , Ken Sauer , Sathish Ramani , Jeffrey A. Fessler , Somesh Srivastava
发明人： Zhou Yu , Bruno Kristiaan Bernard De Man , Jean-Baptiste Thibault , Debashish Pal , Lin Fu , Charles A. Bouman , Ken Sauer , Sathish Ramani , Jeffrey A. Fessler , Somesh Srivastava
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/424
摘要： A method is provided for reconstructing an image of an object that includes image elements. The method includes accessing measurement data associated with the image elements, introducing an auxiliary variable to transform an original problem of reconstructing the image to a constrained optimization problem, and solving the constrained optimization problem using a method of multipliers to create a sequence of sub-problems and solve the sequence of sub-problems. Solving the sequence of sub-problems includes reconstructing the image by optimizing a first objective function. The first objective function is optimized by iteratively solving a nested sequence of approximate optimization problems. An inner loop iteratively optimizes a second objective function approximating the first objective function. An outer loop utilizes the solution of the second objective function to optimize the first objective function.
摘要翻译： 提供了一种用于重构包括图像元素的对象的图像的方法。 该方法包括访问与图像元素相关联的测量数据，引入辅助变量以将原始图像重建问题转换为约束优化问题，以及使用乘法器的方法来解决约束优化问题以创建子问题序列 并解决子问题的顺序。 解决子问题的顺序包括通过优化第一目标函数重建图像。 通过迭代求解近似优化问题的嵌套序列，优化了第一个目标函数。 内循环迭代地优化接近于第一目标函数的第二目标函数。 外环利用第二目标函数的解来优化第一目标函数。
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公开(公告)号：US20130108007A1
公开(公告)日：2013-05-02
申请号：US13285953
申请日：2011-10-31
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/5205 , A61B6/5258 , G06T11/005 , G06T2211/432
摘要： A system and method for CT sinogram extrapolation are provided. The method comprises receiving a CT projection for extrapolation. The method also comprises selecting a target patch comprising at least one pixel of a row to be extrapolated. The method further comprises generating a correlation profile between the target patch and one or more source patches, wherein the source patches comprise measured pixels in the CT projection in one or more rows adjacent to the target patch. The projection data is generated for at least one pixel of the target patch based on the correlation profile and the measured pixels of at least one of the source patches.
摘要翻译： 提供了一种用于CT正弦图外插的系统和方法。 该方法包括接收用于外推的CT投影。 该方法还包括选择包括要外推的行的至少一个像素的目标补丁。 所述方法还包括在所述目标贴片和一个或多个源贴片之间产生相关曲线，其中所述源贴片包括所述CT投影中与所述目标贴片相邻的一行或多行中的测量像素。 基于相关分布和至少一个源补丁的测量像素，为目标补丁的至少一个像素生成投影数据。
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19.发明申请SYSTEM AND METHOD OF ACQUIRING COMPUTED TOMOGRAPHY DATA USING A MULTI-ENERGY X-RAY SOURCE 审中-公开使用多能量X射线源获取计算机图像数据的系统和方法公开(公告)号：US20130003912A1
公开(公告)日：2013-01-03
申请号：US13174485
申请日：2011-06-30
申请人： Bruno Kristiaan Bernard De Man , Jiang Hsieh , Naveen Stephan Chandra , Jiahua Fan , Jed Douglas Pack
发明人： Bruno Kristiaan Bernard De Man , Jiang Hsieh , Naveen Stephan Chandra , Jiahua Fan , Jed Douglas Pack
摘要： The subject matter disclosed herein relates to X-ray imaging systems, and more specifically, to multi-energy computed tomography (CT) X-ray imaging systems. In an embodiment, a multi-energy computed tomography (CT) imaging system includes an X-ray source that emits X-rays upon the application of a low stable bias, a high stable bias, and transitional biases between the low stable bias and the high stable bias. The imaging system also includes an X-ray detector configured to produce an electrical signal corresponding to the intensity of the X-rays emitted by the X-ray source that reach the X-ray detector. The imaging system also includes data processing circuitry configured to acquire a first set of data corresponding to the electrical signal produced by the X-ray detector only when the low stable bias or the high stable bias is applied to the X-ray source. The imaging system also includes a processor configured to process the first set of acquired data and construct one or more multi-energy CT images.
摘要翻译： 本文公开的主题涉及X射线成像系统，更具体地，涉及多能计算机断层摄影（CT）X射线成像系统。 在一个实施例中，多能量计算机断层摄影（CT）成像系统包括在施加低稳定偏压，高稳定偏差以及低稳定偏压和低稳定偏差之间的过渡偏差时发射X射线的X射线源 高稳定偏差。 成像系统还包括：X射线检测器，被配置为产生对应于由X射线源发射的X射线的强度的电信号，该X射线到达X射线检测器。 成像系统还包括数据处理电路，其被配置为仅当低稳定偏压或高稳定偏压施加到X射线源时才获取对应于由X射线检测器产生的电信号的第一组数据。 成像系统还包括被配置为处理第一组获取的数据并构造一个或多个多能CT图像的处理器。
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20.发明申请公开(公告)号：US20120039440A1
公开(公告)日：2012-02-16
申请号：US13174825
申请日：2011-07-01
IPC分类号： G01N23/04
CPC分类号： A61B6/482 , A61B6/032 , A61B6/4241 , A61B6/5258
摘要： An imaging system includes an x-ray source, a detector, a data acquisition system (DAS) operably connected to the detector, and a computer operably connected to the DAS. The computer is programmed to obtain CT scan data with two or more incident energy spectra, decompose the obtained CT scan data into projection CT data of a first basis material and a second basis material, generate a first basis material image and a second basis material image using the decomposed projection CT data, generate a first monochromatic image from the first basis material image and the second basis material image at a first energy that is selected based on an amount of correlated noise at the first energy, noise-reduce the first monochromatic image to generate a noise-reduced first monochromatic image, and generate a final monochromatic image based at least on the noise-reduced first monochromatic image.
摘要翻译： 成像系统包括可操作地连接到检测器的X射线源，检测器，数据采集系统（DAS）以及可操作地连接到DAS的计算机。 计算机被编程以获得具有两个或更多个入射能谱的CT扫描数据，将获得的CT扫描数据分解成第一基材和第二基材的投影CT数据，生成第一基材图像和第二基材图像 使用分解的投影CT数据，以基于第一能量处的相关噪声量选择的第一能量从第一基材图像和第二基材图像生成第一单色图像，降低第一单色图像 以产生噪声减小的第一单色图像，并且至少基于噪声减小的第一单色图像生成最终单色图像。
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