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公开(公告)号：US20120087481A1
公开(公告)日：2012-04-12
申请号：US13376715
申请日：2009-06-12
IPC分类号： G01D18/00
CPC分类号： A61B6/405 , A61B6/032 , A61B6/4007 , A61B6/4035 , A61B6/482 , A61B6/583 , G06T11/005 , G06T2211/408
摘要： The techniques described herein provide for correcting projection data that comprises contamination due to source switching in a multi energy scanner. The correction is a multi-neighbor correction. That is, it uses data from at least two other views of an object (e.g., generally a previous view and a subsequent view) to correct a current view of the object. The multi-neighbor correction may use one or more correction factors to determine how much data from the other two views to use to correct the current view. The correction factor(s) are determined based upon a calibration that utilizes image space data and/or projection space data of a phantom. In this way, the correction factor(s) account for source leakage that occurs in multi energy scanners.
摘要翻译： 本文描述的技术提供用于校正投影数据，其包括由于多能量扫描器中的源切换引起的污染。 校正是多邻居校正。 也就是说，它使用来自对象的至少两个其他视图的数据（例如，通常为先前视图和后续视图）来校正对象的当前视图。 多邻居校正可以使用一个或多个校正因子来确定来自用于校正当前视图的另外两个视图的数据量。 基于利用幻影的图像空间数据和/或投影空间数据的校准来确定校正因子。 以这种方式，校正因子考虑到在多能量扫描仪中发生的源泄漏。
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公开(公告)号：US08483360B2
公开(公告)日：2013-07-09
申请号：US13376715
申请日：2009-06-12
CPC分类号： A61B6/405 , A61B6/032 , A61B6/4007 , A61B6/4035 , A61B6/482 , A61B6/583 , G06T11/005 , G06T2211/408
摘要： The techniques described herein provide for correcting projection data that comprises contamination due to source switching in a multi energy scanner. The correction is a multi-neighbor correction. That is, it uses data from at least two other views of an object (e.g., generally a previous view and a subsequent view) to correct a current view of the object. The multi-neighbor correction may use one or more correction factors to determine how much data from the other two views to use to correct the current view. The correction factor(s) are determined based upon a calibration that utilizes image space data and/or projection space data of a phantom. In this way, the correction factor(s) account for source leakage that occurs in multi energy scanners.
摘要翻译： 本文描述的技术提供用于校正投影数据，其包括由于多能量扫描器中的源切换引起的污染。 校正是多邻居校正。 也就是说，它使用来自对象的至少两个其他视图的数据（例如，通常为先前视图和后续视图）来校正对象的当前视图。 多邻居校正可以使用一个或多个校正因子来确定来自用于校正当前视图的另外两个视图的数据量。 基于利用幻影的图像空间数据和/或投影空间数据的校准来确定校正因子。 以这种方式，校正因子考虑到在多能量扫描仪中发生的源泄漏。
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3.发明申请DETERMINATION OF Z-EFFECTIVE VALUE FOR SET OF VOXELS USING CT DENSITY IMAGE AND SPARSE MULTI-ENERGY DATA 有权使用CT密度图像和稀疏多能数据确定VOXELS集合的Z效率值公开(公告)号：US20150104089A1
公开(公告)日：2015-04-16
申请号：US14397751
申请日：2012-05-01
申请人： Andrew Litvin , Ram Naidu , David Lieblich , Sergey Simanovsky
发明人： Andrew Litvin , Ram Naidu , David Lieblich , Sergey Simanovsky
CPC分类号： G06T11/006 , G01N23/046 , G06T2211/408 , G06T2211/424 , G06T2211/436
摘要： Z-effective (e.g., atomic number) values are generated for one or more sets of voxels in a CT density image using sparse (measured) multi-energy projection data. Voxels in the CT density image are assigned a starting z-effective value, causing a CT z-effective image to be generated from the CT density image. The accuracy of the assigned z-effective values is tested by forward projecting the CT z-effective image to generate synthetic multi-energy projection data and comparing the synthetic multi-energy projection data to the sparse multi-energy projection data. When the measure of similarity between the synthetic data and the sparse data is low, the z-effective value assigned to one or more voxels is modified until the measure of similarity is above a specified threshold (e.g., with an associated confidence score), at which point the z-effective values substantially reflect the z-effective values that would be obtained using a (more expensive) dual-energy CT imaging modality.
摘要翻译： 使用稀疏（测量）多能量投影数据，在CT密度图像中的一组或多组体素生成Z-有效（例如，原子序数）值。 CT密度图像中的体素被分配起始z有效值，从CT密度图像产生CT z有效图像。 通过向前投影CT z有效图像来产生合成多能量投影数据并将合成的多能量投影数据与稀疏多能量投影数据进行比较，来测试所分配的z-有效值的精度。 当合成数据和稀疏数据之间的相似性度量低时，分配给一个或多个体素的z-有效值被修改，直到相似性的度量高于指定的阈值（例如，具有相关的可信度得分），在 这指出z-有效值基本上反映了使用（更昂贵）双能CT成像模式将获得的z-有效值。
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公开(公告)号：US08787669B2
公开(公告)日：2014-07-22
申请号：US13121892
申请日：2008-09-30
申请人： Andrew Litvin , Sergey Simanovsky , Ram Naidu
发明人： Andrew Litvin , Sergey Simanovsky , Ram Naidu
IPC分类号： G06K9/34
CPC分类号： G06T7/155
摘要： Representations of an object can comprise two or more separate sub-objects, producing a compound object. Compound objects can affect the quality of object visualization and threat identification. As provided herein, a compound object can be separated into sub-objects based on object morphological properties (e.g., an object's shape, surface area). Further, a potential compound object can be split into sub-objects, for example, eroding one or more outer layers of volume space (e.g., voxels) from the potential compound object. Additionally, a volume of a representation of the sub-objects in an image can be reconstructed, for example, by generating sub-objects that have a combined volume approximate to that of the compound object. Furthermore, sub-objects, which can be parts of a same physical object, but may have been erroneously split, can be identified and merged using connectivity and compactness based techniques.
摘要翻译： 对象的表示可以包括两个或多个单独的子对象，产生复合对象。 复合对象可以影响对象可视化和威胁识别的质量。 如本文所提供的，可以基于对象形态特性（例如，对象的形状，表面积）将复合对象分成子对象。 此外，潜在的复合对象可以被分割成子对象，例如，从潜在的复合对象侵蚀体积空间的一个或多个外层（例如，体素）。 此外，可以例如通过生成具有近似于复合对象的组合体积的子对象来重建图像中子对象的表示量。 此外，可以使用基于连接性和紧凑性的技术来识别和合并可以是相同物理对象的部分但可能被错误地分割的子对象。
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公开(公告)号：US20100183209A1
公开(公告)日：2010-07-22
申请号：US12357035
申请日：2009-01-21
申请人： Andrew Litvin , Sergey Simanovsky , Ram Naidu
发明人： Andrew Litvin , Sergey Simanovsky , Ram Naidu
CPC分类号： G06T7/0004 , G06T7/11 , G06T7/194 , G06T2207/10081 , G06T2207/30112
摘要： Certain imaging systems, such as automatic explosives detection systems, employ techniques that utilize image processing, feature extraction and decision making steps to detect threats in images. Such techniques use segmentation as a first algorithmic step, which extracts data representing objects from image data. Some of the extracted objects are actually composed of multiple distinct physical objects. For these compound objects discrimination becomes difficult because computed object properties are less specific than properties computed for a single physical object. A technique is described which includes splitting such compound objects by separating the data of each component from the rest of the data and using properties of density histograms based on voxel distributions in both density and spatial domains.
摘要翻译： 某些成像系统，例如自动爆炸物检测系统，采用利用图像处理，特征提取和决策步骤来检测图像中的威胁的技术。 这样的技术使用分割作为第一算法步骤，其从图像数据中提取表示对象的数据。 一些提取的对象实际上由多个不同的物理对象组成。 对于这些复合对象，鉴别变得困难，因为计算的对象属性比为单个物理对象计算的属性的特性要小。 描述了一种技术，其包括通过将每个组件的数据与其余数据分离并使用基于密度和空间域中的体素分布的密度直方图的属性来拆分这样的复合对象。
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6.发明授权Determination of z-effective value for set of voxels using CT density image and sparse multi-energy data 有权使用CT密度图像和稀疏多能数据确定体素集的z-有效值公开(公告)号：US09390523B2
公开(公告)日：2016-07-12
申请号：US14397751
申请日：2012-05-01
申请人： Andrew Litvin , Ram Naidu , David Lieblich , Sergey Simanovsky
发明人： Andrew Litvin , Ram Naidu , David Lieblich , Sergey Simanovsky
CPC分类号： G06T11/006 , G01N23/046 , G06T2211/408 , G06T2211/424 , G06T2211/436
摘要： Z-effective (e.g., atomic number) values are generated for one or more sets of voxels in a CT density image using sparse (measured) multi-energy projection data. Voxels in the CT density image are assigned a starting z-effective value, causing a CT z-effective image to be generated from the CT density image. The accuracy of the assigned z-effective values is tested by forward projecting the CT z-effective image to generate synthetic multi-energy projection data and comparing the synthetic multi-energy projection data to the sparse multi-energy projection data. When the measure of similarity between the synthetic data and the sparse data is low, the z-effective value assigned to one or more voxels is modified until the measure of similarity is above a specified threshold (e.g., with an associated confidence score), at which point the z-effective values substantially reflect the z-effective values that would be obtained using a (more expensive) dual-energy CT imaging modality.
摘要翻译： 使用稀疏（测量）多能量投影数据，在CT密度图像中的一组或多组体素生成Z-有效（例如，原子序数）值。 CT密度图像中的体素被分配起始z有效值，从CT密度图像产生CT z有效图像。 通过向前投影CT z有效图像来产生合成多能量投影数据并将合成的多能量投影数据与稀疏多能量投影数据进行比较，来测试所分配的z-有效值的精度。 当合成数据和稀疏数据之间的相似性度量低时，分配给一个或多个体素的z-有效值被修改，直到相似性的度量高于指定的阈值（例如，具有相关的可信度得分），在 这指出z-有效值基本上反映了使用（更昂贵）双能CT成像模式将获得的z-有效值。
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7.发明授权公开(公告)号：US08817019B2
公开(公告)日：2014-08-26
申请号：US13387851
申请日：2009-07-31
申请人： Ram Naidu , Sergey Simanovsky , Andrew Litvin
发明人： Ram Naidu , Sergey Simanovsky , Andrew Litvin
CPC分类号： G06T11/001
摘要： A projection image of an object is colored using three-dimensional image data. This may be particularly useful in radiographic imaging applications, for example. In one embodiment, a colored synthetic image is rendered from a colored three-dimensional image of an object, and color components of pixels of the synthetic image are used to determine color components, or color values, for corresponding pixels of a projection image depicting a similar view of the object as the synthetic image. In this way, the two-dimensional projection image is colored similarly to the colored three-dimensional image. For example, the projection image may be colored based upon density (if the three-dimensional image is colored based upon density) so aspects of the object that attenuate a similar amount of radiation but have different densities may be colored differently.
摘要翻译： 使用三维图像数据对物体的投影图像进行着色。 例如，这可能在放射照相成像应用中特别有用。 在一个实施例中，彩色合成图像从对象的彩色三维图像呈现，并且使用合成图像的像素的颜色分量来确定用于描绘图像的投影图像的相应像素的颜色分量或颜色值 作为合成图像的对象的类似视图。 以这种方式，二维投影图像与彩色三维图像类似地着色。 例如，投影图像可以基于密度着色（如果三维图像基于密度着色），则可以对不同密度的相似量的辐射削弱相同量的物体的方面进行着色。
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公开(公告)号：US08391600B2
公开(公告)日：2013-03-05
申请号：US12357035
申请日：2009-01-21
申请人： Andrew Litvin , Sergey Simanovsky , Ram Naidu
发明人： Andrew Litvin , Sergey Simanovsky , Ram Naidu
CPC分类号： G06T7/0004 , G06T7/11 , G06T7/194 , G06T2207/10081 , G06T2207/30112
摘要： Certain imaging systems, such as automatic explosives detection systems, employ techniques that utilize image processing, feature extraction and decision making steps to detect threats in images. Such techniques use segmentation as a first algorithmic step, which extracts data representing objects from image data. Some of the extracted objects are actually composed of multiple distinct physical objects. For these compound objects discrimination becomes difficult because computed object properties are less specific than properties computed for a single physical object. A technique is described which includes splitting such compound objects by separating the data of each component from the rest of the data and using properties of density histograms based on voxel distributions in both density and spatial domains.
摘要翻译： 某些成像系统，例如自动爆炸物检测系统，采用利用图像处理，特征提取和决策步骤来检测图像中的威胁的技术。 这样的技术使用分割作为第一算法步骤，其从图像数据中提取表示对象的数据。 一些提取的对象实际上由多个不同的物理对象组成。 对于这些复合对象，鉴别变得困难，因为计算的对象属性比为单个物理对象计算的属性的特性要小。 描述了一种技术，其包括通过将每个组件的数据与其余数据分离并使用基于密度和空间域中的体素分布的密度直方图的属性来拆分这样的复合对象。
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9.发明申请公开(公告)号：US20120127174A1
公开(公告)日：2012-05-24
申请号：US13387851
申请日：2009-07-31
申请人： Ram Naidu , Sergey Simanovsky , Andrew Litvin
发明人： Ram Naidu , Sergey Simanovsky , Andrew Litvin
CPC分类号： G06T11/001
摘要： A projection image of an object is colored using three-dimensional image data. This may be particularly useful in radiographic imaging applications, for example. In one embodiment, a colored synthetic image is rendered from a colored three-dimensional image of an object, and color components of pixels of the synthetic image are used to determine color components, or color values, for corresponding pixels of a projection image depicting a similar view of the object as the synthetic image. In this way, the two-dimensional projection image is colored similarly to the colored three-dimensional image. For example, the projection image may be colored based upon density (if the three-dimensional image is colored based upon density) so aspects of the object that attenuate a similar amount of radiation but have different densities may be colored differently.
摘要翻译： 使用三维图像数据对物体的投影图像进行着色。 例如，这可能在放射照相成像应用中特别有用。 在一个实施例中，彩色合成图像从对象的彩色三维图像呈现，并且使用合成图像的像素的颜色分量来确定用于描绘图像的投影图像的相应像素的颜色分量或颜色值 作为合成图像的对象的类似视图。 以这种方式，二维投影图像与彩色三维图像类似地着色。 例如，投影图像可以基于密度着色（如果三维图像基于密度着色），则可以对不同密度的相似量的辐射削弱相同量的物体的方面进行着色。
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公开(公告)号：US09665953B2
公开(公告)日：2017-05-30
申请号：US13318653
申请日：2009-06-30
申请人： Andrew Litvin , Ram Naidu
发明人： Andrew Litvin , Ram Naidu
CPC分类号： G06T11/006 , G06T2211/416 , G06T2211/421
摘要： A CT scanner comprises: at least one source of X-rays and a multi-row detector array of arbitrary geometry, both supported so as rotate around an axis of rotation during a scan of an object translated along the axis, wherein data for each detector is generated as a function of the X-ray energy received; and a data processor configured so as to perform resampling of the data onto curves in a virtual detector array. The curves project onto tilted lines in a virtual flat detector as to enable tangential filtering of the data.
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