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1. 发明申请

US20120134561A1 METHOD AND SYSTEM FOR CORRELATED NOISE SUPPRESSION IN DUAL ENERGY IMAGING 有权
标题翻译：双能量成像中相关噪声抑制的方法与系统
公开(公告)号：US20120134561A1
公开(公告)日：2012-05-31
申请号：US12955227
申请日：2010-11-29
申请人： Dan Xu , David Allen Langan , Xiaoye Wu , Jed Douglas Pack , Andrea Marie Schmitz
发明人： Dan Xu , David Allen Langan , Xiaoye Wu , Jed Douglas Pack , Andrea Marie Schmitz
IPC分类号： G06K9/00
CPC分类号： G06T11/008 , G06T5/002 , G06T5/50 , G06T2207/10081 , G06T2211/408
摘要： Methods and systems for correlated noise suppression are presented. The present correlated noise suppression technique estimates a correlation direction between noise values in a first and a second MD image corresponding to a first and a second basis material, respectively. The two MD images are diffused using the estimated correlation direction to generate a first and a second diffused image. Further, first and second noise masks are generated by subtracting the diffused image from the corresponding MD image. Edges in the first and the second MD images are processed with the first and second noise masks, respectively to generate a final first noise mask and a final second noise mask. The first MD image is then processed with the final second noise mask to generate a final first MD image and the second MD image is processed with the final first noise mask to generate a final second MD image.
摘要翻译：提出了相关噪声抑制的方法和系统。本相关噪声抑制技术分别估计与第一和第二基础材料对应的第一和第二MD图像中的噪声值之间的相关方向。使用估计的相关方向来扩散两个MD图像以生成第一和第二扩散图像。此外，通过从相应的MD图像中减去漫射图像来产生第一和第二噪声掩码。第一和第二MD图像中的边缘分别用第一和第二噪声掩模进行处理，以产生最终的第一噪声掩模和最终的第二噪声掩模。然后用最终的第二噪声掩码处理第一MD图像以产生最终的第一MD图像，并且用最终的第一噪声掩码处理第二MD图像以产生最终的第二MD图像。

2. 发明授权

US08401266B2 Method and system for correlated noise suppression in dual energy imaging 有权
标题翻译：双能量成像相关噪声抑制方法与系统
公开(公告)号：US08401266B2
公开(公告)日：2013-03-19
申请号：US12955227
申请日：2010-11-29
申请人： Dan Xu , David Allen Langan , Xiaoye Wu , Jed Douglas Pack , Andrea Marie Schmitz
发明人： Dan Xu , David Allen Langan , Xiaoye Wu , Jed Douglas Pack , Andrea Marie Schmitz
IPC分类号： G06K9/00 , G06K9/40
CPC分类号： G06T11/008 , G06T5/002 , G06T5/50 , G06T2207/10081 , G06T2211/408
摘要： Methods and systems for correlated noise suppression are presented. The present correlated noise suppression technique estimates a correlation direction between noise values in a first and a second MD image corresponding to a first and a second basis material, respectively. The two MD images are diffused using the estimated correlation direction to generate a first and a second diffused image. Further, first and second noise masks are generated by subtracting the diffused image from the corresponding MD image. Edges in the first and the second MD images are processed with the first and second noise masks, respectively to generate a final first noise mask and a final second noise mask. The first MD image is then processed with the final second noise mask to generate a final first MD image and the second MD image is processed with the final first noise mask to generate a final second MD image.
摘要翻译：提出了相关噪声抑制的方法和系统。本相关噪声抑制技术分别估计与第一和第二基础材料对应的第一和第二MD图像中的噪声值之间的相关方向。使用估计的相关方向来扩散两个MD图像以生成第一和第二扩散图像。此外，通过从相应的MD图像中减去漫射图像来产生第一和第二噪声掩码。第一和第二MD图像中的边缘分别用第一和第二噪声掩模进行处理，以产生最终的第一噪声掩模和最终的第二噪声掩模。然后用最终的第二噪声掩码处理第一MD图像以产生最终的第一MD图像，并且用最终的第一噪声掩码处理第二MD图像以产生最终的第二MD图像。

3. 发明授权

US07826587B1 System and method of fast kVp switching for dual energy CT 有权
标题翻译：双能CT快速kVp开关系统及方法
公开(公告)号：US07826587B1
公开(公告)日：2010-11-02
申请号：US12558248
申请日：2009-09-11
申请人： David Allen Langan , John Eric Tkaczyk , James Walter LeBlanc , Colin R. Wilson , Xiaoye Wu , Dan Xu , Thomas Matthew Benson , Jed Douglas Pack
发明人： David Allen Langan , John Eric Tkaczyk , James Walter LeBlanc , Colin R. Wilson , Xiaoye Wu , Dan Xu , Thomas Matthew Benson , Jed Douglas Pack
IPC分类号： H05G1/60
CPC分类号： A61B6/405 , A61B6/032 , A61B6/482
摘要： A CT system includes a gantry, an x-ray source, a generator configured to energize the x-ray source to a first kVp and to a second kVp, a detector, and a controller. The controller is configured energize the x-ray source to the first kVp for a first time period, subsequently energize the x-ray source to the second kVp for a second time period, integrate data for a first integration period that includes a portion of a steady-state period of the x-ray source at the first kVp, integrate data for a second integration period that includes a portion of a steady-state period of the x-ray source at the second kVp, compare a signal-to-noise ratio (SNR) during the first integration period (SNRH) and the second integration period (SNRL), adjust an operating parameter of the CT system to optimize an SNRH with SNRL, and generate an image using the integrated data.
摘要翻译： CT系统包括台架，x射线源，被配置为将x射线源激发到第一kVp的发生器和到第二kVp的检测器和控制器的发生器。控制器被配置为在第一时间段内将x射线源激励到第一kVp，随后将x射线源激励到第二kVp第二时间段，将包含第一时间段的第一积分周期的数据整合在第一kVp处的x射线源的稳态周期，将包括X射线源的稳态周期的一部分的第二积分周期的数据集成在第二kVp处，比较信号与噪声在第一积分周期（SNRH）和第二积分周期（SNRL）期间的比率（SNR），调整CT系统的运行参数以利用SNRL优化SNRH，并使用积分数据生成图像。

4. 发明授权

US07609802B2 Method and system for reconstructing image volumes from helical scan acquisitions 有权
标题翻译：从螺旋扫描采集重建图像体积的方法和系统
公开(公告)号：US07609802B2
公开(公告)日：2009-10-27
申请号：US11740002
申请日：2007-04-25
申请人： David Allen Langan , Peter Michael Edic , Xiaoye Wu , Jed Douglas Pack
发明人： David Allen Langan , Peter Michael Edic , Xiaoye Wu , Jed Douglas Pack
IPC分类号： A61B6/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/421
摘要： A method, computed tomography (CT) system and computer-readable medium for reconstructing an image volume of an object scanned in helical mode. An embodiment of the method includes determining discrete focal lengths within an imaging plane of the reconstructed field of view comprising the image volume; generating a circular scan sinogram(s) for the discrete focal lengths by interpolating the helical views; selecting within a backprojection operation a circular scan sonogram(s), for one or more image points within the imaging plane, over one or more circular views. The method then includes using the selected circular scan sinogram(s), in the backprojection of the image points point(s) over the circular views view(s) and performing a backprojection for all the image points over all the circular views to generate a reconstructed image of the object.
摘要翻译：一种计算机断层摄影（CT）系统和用于重建以螺旋模式扫描的物体的图像体积的计算机可读介质的方法。该方法的实施例包括确定包括图像体积的重建视野的成像平面内的离散焦距; 通过内插螺旋视图来产生用于离散焦距的圆形扫描正弦图; 在反投影操作中，在一个或多个圆形视图上选择用于成像平面内的一个或多个图像点的圆形扫描超声波图。该方法然后包括在圆形视图视图上的图像点点的反投影中使用所选择的圆形扫描正弦图，并对所有圆形视图上的所有图像点执行反投影以产生对象的重建图像。

5. 发明申请

US20080267476A1 METHOD AND SYSTEM FOR RECONSTRUCTING IMAGE VOLUMES FROM HELICAL SCAN ACQUISITIIONS 有权
标题翻译：用于重新构建图像质量的方法和系统，从螺旋扫描获取
公开(公告)号：US20080267476A1
公开(公告)日：2008-10-30
申请号：US11740002
申请日：2007-04-25
申请人： David Allen Langan , Peter Michael Edic , Xiaoye Wu , Jed Douglas Pack
发明人： David Allen Langan , Peter Michael Edic , Xiaoye Wu , Jed Douglas Pack
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/421
摘要： A method and computer-readable medium for reconstructing an image volume of an object scanned in helical mode is provided. The method and computer-readable medium include obtaining one or more helical views corresponding to an image volume of an object and determining a plurality of discretized focal lengths within an imaging plane of the reconstructed field of view comprising the image volume. The method then comprises generating a plurality of circular scan sinograms for the plurality of discretized focal lengths. The plurality of circular scan sinograms are generated by interpolating the helical views. The method then comprises selecting one or more circular scan sinograms from the plurality of circular scan sinograms, based on the plurality of discretized focal lengths, wherein the selection is performed within a backprojection operation, for one or more image points within the imaging plane, over one or more circular views. The method then comprises using one or more of the selected circular scan sinograms, in the backprojection of one or more of the image points over one or more of the circular views. The method finally comprises performing a backprojection for all the image points over all the circular views to generate a reconstructed image of the object.
摘要翻译：提供了一种用于重建以螺旋模式扫描的对象的图像体积的方法和计算机可读介质。所述方法和计算机可读介质包括获得对应于对象的图像体积的一个或多个螺旋视图，并且确定包括图像体积的重构视场的成像平面内的多个离散焦距。该方法然后包括为多个离散焦距生成多个圆形扫描正弦图。通过内插螺旋视图来产生多个圆形扫描正弦图。该方法然后包括基于多个离散焦距从多个圆形扫描正弦图中选择一个或多个圆形扫描正弦图，其中在反投影操作内对成像平面内的一个或多个图像点进行选择一个或多个圆形视图。该方法然后包括在一个或多个圆形视图中的一个或多个图像点的反投影中使用所选择的圆形扫描正弦图中的一个或多个。该方法最终包括对所有圆形视图上的所有图像点执行反投影以产生对象的重建图像。

6. 发明授权

US07995702B2 System and method of data interpolation in fast kVp switching dual energy CT 有权
标题翻译：快速kVp开关双能CT数据插值系统与方法
公开(公告)号：US07995702B2
公开(公告)日：2011-08-09
申请号：US12547117
申请日：2009-08-25
申请人： Dan Xu , David Allen Langan , Xiaoye Wu
发明人： Dan Xu , David Allen Langan , Xiaoye Wu
IPC分类号： A61B6/00
CPC分类号： G01N23/046 , A61B6/027 , G01N2223/419 , G01N2223/612 , G06T11/005 , G06T2211/408
摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, an x-ray source coupled to the gantry and configured to project x-rays through the opening, a generator configured to energize the x-ray source to a first kVp and to a second kVp to generate the x-rays, and a detector having pixels therein, the detector attached to the gantry and positioned to receive the x-rays. The system includes a computer programmed to acquire a first view dataset and a second view dataset with the x-ray source energized to the first kVp, interpolate the first and second view datasets to generate interpolated pixels in an interpolated view dataset at the first kVp, using at least two pixels from each of the first and second view datasets to generate each interpolated pixel in the interpolated view dataset, and generate an image of the object using the interpolated view dataset.
摘要翻译： CT系统包括可旋转机架，其具有用于接收待扫描物体的开口，耦合到台架的X射线源，并且被配置成将X射线投射穿过开口;发生器，被配置为将x射线源激励到第一kVp和第二kVp以产生x射线，以及其中具有像素的检测器，所述检测器附接到台架并定位成接收x射线。该系统包括被编程为获取第一视图数据集的计算机和具有激励到第一kVp的x射线源的第二视图数据集，内插第一和第二视图数据集以在第一kVp的内插视图数据集中生成内插像素，使用来自第一和第二视图数据集中的每一个的至少两个像素来生成内插视图数据集中的每个内插像素，并且使用内插视图数据集生成对象的图像。

7. 发明申请

US20110052022A1 SYSTEM AND METHOD OF DATA INTERPOLATION IN FAST KVP SWITCHING DUAL ENERGY CT 有权
标题翻译：快速KVP切换双能量CT数据插值系统与方法
公开(公告)号：US20110052022A1
公开(公告)日：2011-03-03
申请号：US12547117
申请日：2009-08-25
申请人： Dan Xu , David Allen Langan , Xiaoye Wu
发明人： Dan Xu , David Allen Langan , Xiaoye Wu
IPC分类号： G06K9/00 , G01N23/00
CPC分类号： G01N23/046 , A61B6/027 , G01N2223/419 , G01N2223/612 , G06T11/005 , G06T2211/408
摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, an x-ray source coupled to the gantry and configured to project x-rays through the opening, a generator configured to energize the x-ray source to a first kVp and to a second kVp to generate the x-rays, and a detector having pixels therein, the detector attached to the gantry and positioned to receive the x-rays. The system includes a computer programmed to acquire a first view dataset and a second view dataset with the x-ray source energized to the first kVp, interpolate the first and second view datasets to generate interpolated pixels in an interpolated view dataset at the first kVp, using at least two pixels from each of the first and second view datasets to generate each interpolated pixel in the interpolated view dataset, and generate an image of the object using the interpolated view dataset.
摘要翻译： CT系统包括可旋转机架，其具有用于接收待扫描物体的开口，耦合到台架的X射线源，并且被配置成将X射线投射穿过开口;发生器，被配置为将x射线源激励到第一kVp和第二kVp以产生x射线，以及其中具有像素的检测器，所述检测器附接到台架并定位成接收x射线。该系统包括被编程为获取第一视图数据集的计算机和具有激励到第一kVp的x射线源的第二视图数据集，内插第一和第二视图数据集以在第一kVp的内插视图数据集中生成内插像素，使用来自第一和第二视图数据集中的每一个的至少两个像素来生成内插视图数据集中的每个内插像素，并且使用内插视图数据集生成对象的图像。

8. 发明授权

US08160206B2 Dual-energy imaging at reduced sample rates 有权
标题翻译：降低采样率的双能量成像
公开(公告)号：US08160206B2
公开(公告)日：2012-04-17
申请号：US12962972
申请日：2010-12-08
申请人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lai , Dan Xu , Thomas Matthew Benson
发明人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lai , Dan Xu , Thomas Matthew Benson
IPC分类号： H05G1/64
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/405 , A61B6/482 , A61B6/505 , G06T11/005 , G06T2211/408
摘要： The present disclosure relates to the generation of dual-energy X-ray data using a data sampling rate comparable to the rate utilized for single-energy imaging. In accordance with the present technique a reduced kVp switching rate is employed compared to conventional dual-energy imaging. Full angular resolution is achieved in the generated images.
摘要翻译：本公开涉及使用与用于单能量成像的速率相当的数据采样率来生成双能量X射线数据。根据本技术，与传统的双能量成像相比，采用了降低的kVp开关速率。在生成的图像中实现全角度分辨率。

9. 发明授权

US08155263B2 Apparatus and method for voltage modulation in X-ray computed tomography 有权
标题翻译： X射线计算机断层扫描中电压调制的装置和方法
公开(公告)号：US08155263B2
公开(公告)日：2012-04-10
申请号：US12534087
申请日：2009-07-31
申请人： Xiaoye Wu , David Allen Langan , James Walter LeBlanc , Dan Xu
发明人： Xiaoye Wu , David Allen Langan , James Walter LeBlanc , Dan Xu
IPC分类号： H05G1/60
CPC分类号： A61B6/544 , A61B6/027 , A61B6/032 , A61B6/488
摘要： The present invention discloses a computed tomography imager comprising: an x-ray source disposed in a gantry; a detector assembly for receiving an x-ray emission from an x-ray source, the x-ray source and the detector assembly rotatable about an imaging target; an imager control system for selectively modulating a kVp operating value in the x-ray source during a scan slice in accordance with an x-ray modulation software program; and a computer for receiving data from the detector assembly, and for providing control signals to the imager control system by executing the x-ray modulation software program for at least a portion of the total possible rotational scanning range of the x-ray source.
摘要翻译：本发明公开了一种计算机断层成像仪，包括：设置在台架中的x射线源; 用于从X射线源接收x射线发射的检测器组件，所述x射线源和所述检测器组件围绕成像靶旋转; 成像器控制系统，用于根据x射线调制软件程序在扫描切片期间选择性地调制x射线源中的kVp操作值; 以及计算机，用于从检测器组件接收数据，并且通过对X射线源的总可能的旋转扫描范围的至少一部分执行x射线调制软件程序来向成像器控制系统提供控制信号。

10. 发明申请

US20110150183A1 DUAL-ENERGY IMAGING AT REDUCED SAMPLE RATES 有权
标题翻译：降低采样率的双能量成像
公开(公告)号：US20110150183A1
公开(公告)日：2011-06-23
申请号：US12962972
申请日：2010-12-08
申请人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lia , Dan Xu , Thomas Matthew Benson
发明人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lia , Dan Xu , Thomas Matthew Benson
IPC分类号： H05G1/64
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/405 , A61B6/482 , A61B6/505 , G06T11/005 , G06T2211/408
摘要： The present disclosure relates to the generation of dual-energy X-ray data using a data sampling rate comparable to the rate utilized for single-energy imaging. In accordance with the present technique a reduced kVp switching rate is employed compared to conventional dual-energy imaging. Full angular resolution is achieved in the generated images.
摘要翻译：本公开涉及使用与用于单能量成像的速率相当的数据采样率来生成双能量X射线数据。根据本技术，与传统的双能量成像相比，采用了降低的kVp开关速率。在生成的图像中实现全角度分辨率。

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