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。

公开(公告)号：US20090214095A1

公开(公告)日：2009-08-27

申请号：US12035072

申请日：2008-02-21

申请人： Xiaoye Wu ,  David Allen Langan ,  James Walter LeBlanc

发明人： Xiaoye Wu ,  David Allen Langan ,  James Walter LeBlanc

IPC分类号： G06K9/00

CPC分类号： G06T5/002 ,  G06T2207/10081 ,  G06T2207/30004

摘要： In dual energy CT, through basis material decomposition (BMD), a pair of density images can be reconstructed. The noises in this image pair are negatively correlated due to the BMD process. A technique is presented for obtaining the monochromatic images at desired energy levels with reduced correlation noise. The technique includes obtaining a plurality of optimum attenuation coefficients for an energy level, selecting a desired energy level, obtaining a plurality of desired attenuation coefficients for the desired energy level, computing a scaling factor for a corresponding noise component based on the optimum attenuation coefficients and the desired attenuation coefficients, and generating a monochromatic image based upon the scaling factor.

摘要翻译： 在双能量CT中，通过基础材料分解（BMD），可以重构一对密度图像。 由于BMD过程，该图像对中的噪声是负相关的。 提出了一种技术，用于以降低的相关噪声在期望的能级获得单色图像。 该技术包括获得能量水平的多个最佳衰减系数，选择期望的能级，获得期望能级的多个期望衰减系数，基于最佳衰减系数计算相应噪声分量的缩放因子，以及 期望的衰减系数，以及基于缩放因子产生单色图像。

公开(公告)号：US08055039B2

公开(公告)日：2011-11-08

申请号：US12035072

申请日：2008-02-21

申请人： Xiaoye Wu ,  David Allen Langan ,  James Walter LeBlanc

发明人： Xiaoye Wu ,  David Allen Langan ,  James Walter LeBlanc

IPC分类号： G06K9/00

CPC分类号： G06T5/002 ,  G06T2207/10081 ,  G06T2207/30004

摘要： In dual energy CT, through basis material decomposition (BMD), a pair of density images can be reconstructed. The noises in this image pair are negatively correlated due to the BMD process. A technique is presented for obtaining the monochromatic images at desired energy levels with reduced correlation noise. The technique includes obtaining a plurality of optimum attenuation coefficients for an energy level, selecting a desired energy level, obtaining a plurality of desired attenuation coefficients for the desired energy level, computing a scaling factor for a corresponding noise component based on the optimum attenuation coefficients and the desired attenuation coefficients, and generating a monochromatic image based upon the scaling factor.

摘要翻译： 在双能量CT中，通过基础材料分解（BMD），可以重构一对密度图像。 由于BMD过程，该图像对中的噪声是负相关的。 提出了一种技术，用于以降低的相关噪声在期望的能级获得单色图像。 该技术包括获得能量水平的多个最佳衰减系数，选择所需能级，获得所需能级的多个期望衰减系数，基于最佳衰减系数计算相应噪声分量的缩放因子，以及 期望的衰减系数，以及基于缩放因子产生单色图像。

公开(公告)号：US20110026668A1

公开(公告)日：2011-02-03

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工作值; 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。

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。

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。

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。

公开(公告)号：US08160200B2

公开(公告)日：2012-04-17

申请号：US12750050

申请日：2010-03-30

申请人： John Eric Tkaczyk ,  David Allen Langan ,  Samit Kumar Basu ,  Xiaoye Wu ,  Bruno Kristiaan Bernard De Man ,  Jeffrey Seymour Gordon

发明人： John Eric Tkaczyk ,  David Allen Langan ,  Samit Kumar Basu ,  Xiaoye Wu ,  Bruno Kristiaan Bernard De Man ,  Jeffrey Seymour Gordon

IPC分类号： H05G1/26

CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/488 ,  A61B6/542

摘要： A technique for acquiring desired image data in an imaging system comprising at least one radiation source and a detector is described. Initially, preliminary image data corresponding to an object may be acquired. Further, at least one parameter associated with the radiation source and corresponding to a particular view angle of the radiation source may be determined based on the preliminary image data and a priori information. Similarly, at least one parameter associated with the detector and corresponding to the particular view angle may be determined based on a priori information and the preliminary image data. Efficient operating modes of the radiation source and the detector corresponding to the particular view angle may be selected based on the determined parameters to achieve a desired system performance. Subsequently, the final image data may be acquired using the selected operating modes of the radiation source and the detector.

摘要翻译： 描述了在包括至少一个辐射源和检测器的成像系统中获取所需图像数据的技术。 首先，可以获取与对象相对应的初步图像数据。 此外，可以基于初步图像数据和先验信息来确定与辐射源相关联并且对应于辐射源的特定视角的至少一个参数。 类似地，可以基于先验信息和初步图像数据来确定与检测器相关联并且对应于特定视角的至少一个参数。 可以基于确定的参数来选择对应于特定视角的辐射源和检测器的有效操作模式以实现期望的系统性能。 随后，可以使用所选择的辐射源和检测器的操作模式来获取最终图像数据。

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。

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。