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    Correction algorithm for bone-induced spectral artifacts in computed tomograph imaging
    1.
    发明授权
    Correction algorithm for bone-induced spectral artifacts in computed tomograph imaging 失效
    计算机断层成像中骨诱导光谱伪影的校正算法

    公开(公告)号：US6115487A

    公开(公告)日：2000-09-05

    申请号：US4397

    申请日：1998-01-08

    申请人： Thomas L. Toth ,  Guy M. Besson ,  Jiang Hsieh ,  Tin-Su Pan

    发明人： Thomas L. Toth ,  Guy M. Besson ,  Jiang Hsieh ,  Tin-Su Pan

    IPC分类号： A61B6/03 ,  A61B6/00 ,  G01N23/04 ,  G06K9/00

    CPC分类号： A61B6/583 ,  G01N23/046 ,  A61B6/027 ,  G01N2223/419 ,  Y10S378/901

    摘要： A spectral correction algorithm for correcting dense object-induced spectral artifacts is described. In one embodiment, a calibration object, representative of typical head scanning conditions is scanned and the data reconstructed to provide an image. A water or water-equivalent cylinder of about the same diameter also is scanned and reconstructed, on the same display field of view (DFOV). These two images are designated respectively by BWEQ and WEQ. The ratio of images BWEQ and WEQ is then evaluated, and a region of interest extracted by multiplying the ratio by a function II(r), to obtain a calibration pattern CP. The calibration pattern is then averaged in azimuth to obtain a calibration vector. This calibration vector is fitted with low--order polynomial, and then divided by the fitting polynomial, to take out from the vector the low frequency components that, for instance, would be introduced on an "ideal" scanner. By subtracting 1.0 from the ratio, and multiplying by a CT number scale factor (ctscale) and an apodizing window Aw(r), a calibration error vector CEV is obtained that is representative of the circularly symmetric image error introduced by the non-corrected bone-induced artifact. The corresponding error calibration vector can be expanded into a circularly symmetric image error pattern I[CEV(r)], and subtracted from the calibration image, to provide a substantially artifact free image. The method can be extended to extract and correlate error vectors on an image segment basis such that the resulting error image pattern is not circularly symmetric.

    摘要翻译： 描述了用于校正致密物体感应光谱伪影的光谱校正算法。 在一个实施例中，代表典型头部扫描条件的校准对象被扫描，并且重建数据以提供图像。 在相同的显示视野（DFOV）上也扫描和重构大约相同直径的水或水当量圆柱体。 这两个图像分别由BWEQ和WEQ指定。 然后评估图像BWEQ和WEQ的比率，并且通过将该比率乘以函数II（r）而提取的感兴趣区域以获得校准图案CP。 然后将校准图案在方位平均，以获得校准矢量。 该校准矢量装配有低阶多项式，然后用拟合多项式除以从矢量中取出例如将在“理想”扫描仪上引入的低频分量。 通过从该比值中减去1.0，乘以CT数比例因子（ctscale）和变迹窗口Aw（r），获得代表由未校正骨引入的圆对称图像误差的校准误差向量CEV 诱导的神器。 相应的误差校准矢量可以扩展成圆对称图像误差模式I [CEV（r）]，并从校准图像中减去，以提供基本上无伪影的图像。 该方法可以扩展以在图像片段上提取和关联错误矢量，使得所得到的误差图像图案不是圆对称的。

    System and method of acquiring multi-energy CT imaging data
    3.
    发明授权
    System and method of acquiring multi-energy CT imaging data 有权
    获取多能CT成像数据的系统和方法

    公开(公告)号：US08199875B2

    公开(公告)日：2012-06-12

    申请号：US12760862

    申请日：2010-04-15

    申请人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    发明人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    IPC分类号： A61B6/00

    CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/482

    摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller configured to apply a first kVp for a first time period, apply a second kVp for a second time period, wherein the second time period is different from the first time period, acquire a first asymmetric view dataset during at least a portion of the first time period, acquire a second asymmetric view dataset during at least a portion of the second time period, and generate an image using the acquired first and second asymmetric view datasets.

    摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架，以及被配置为在第一时间段施加第一kVp的控制器，在第二时间段施加第二kVp，其中第二时间段是不同的 从所述第一时间段在所述第一时间段的至少一部分期间获取第一非对称视图数据集，在所述第二时间段的至少一部分期间获取第二非对称视图数据集，并且使用所获取的第一和第二时间段生成图像 非对称视图数据集。

    System and method of acquiring multi-energy CT imaging data
    4.
    发明授权
    System and method of acquiring multi-energy CT imaging data 有权
    获取多能CT成像数据的系统和方法

    公开(公告)号：US08363779B2

    公开(公告)日：2013-01-29

    申请号：US13484707

    申请日：2012-05-31

    申请人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    发明人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    IPC分类号： A61B6/00 ,  H05G1/64 ,  G06K9/00

    CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/482

    摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller. The controller is configured to apply a first kVp for a first time period, apply a second kVp for a second time period, integrate two or more view datasets during the first time period, integrate one or more view datasets during the second time period, and generate an image using the datasets integrated during the first time period and during the second time period.

    摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架和控制器。 控制器被配置为在第一时间段内施加第一kVp，在第二时间段施加第二kVp，在第一时间段期间集成两个或更多个视图数据集，在第二时间段期间集成一个或多个视图数据集;以及 使用在第一时间段期间和第二时间段期间集成的数据集生成图像。

    Method and apparatus of radiographic imaging with an energy beam tailored for a subject to be scanned
    5.
    发明授权
    Method and apparatus of radiographic imaging with an energy beam tailored for a subject to be scanned 有权
    使用针对待扫描的被摄体定制的能量束的放射照相成像的方法和装置

    公开(公告)号：US07630477B2

    公开(公告)日：2009-12-08

    申请号：US11831034

    申请日：2007-07-31

    申请人： Thomas L. Toth ,  J. Eric Tkaczyk ,  Jiang Hsieh

    发明人： Thomas L. Toth ,  J. Eric Tkaczyk ,  Jiang Hsieh

    IPC分类号： G21K3/00 ,  A61B6/03

    CPC分类号： A61B6/4042 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4488 ,  G01T1/2985 ,  G21K1/04 ,  G21K1/10

    摘要： A method and apparatus for tailoring the profile of an x-ray beam for radiographic imaging for a specific subject is disclosed. The invention includes a filter assembly having a pair of filters, each of which may be dynamically controlled by a motor assembly during data acquisition. The filters are positionable in the x-ray beam so as to shape the intensity profile of the x-ray beam. In one exemplary embodiment, the filters are dynamically positioned during CT data acquisition based on the shape of the subject. A method of determining the shape of the subject prior to CT data acquisition is also disclosed.

    摘要翻译： 公开了一种用于定制用于特定对象的X射线成像的X射线束的轮廓的方法和装置。 本发明包括具有一对滤波器的滤波器组件，每个滤波器可以在数据采集期间由电机组件动态地控制。 过滤器可以定位在x射线束中，以便形成x射线束的强度分布。 在一个示例性实施例中，基于对象的形状，在CT数据采集期间，滤波器被动态地定位。 还公开了在CT数据采集之前确定对象的形状的方法。

    Method and apparatus of radiographic imaging with an energy beam tailored for a subject to be scanned
    6.
    发明授权
    Method and apparatus of radiographic imaging with an energy beam tailored for a subject to be scanned 有权
    使用针对待扫描的被摄体定制的能量束的放射照相成像的方法和装置

    公开(公告)号：US07260182B2

    公开(公告)日：2007-08-21

    申请号：US11419851

    申请日：2006-05-23

    申请人： Thomas L. Toth ,  John Eric Tkaczyk ,  Jiang Hsieh

    发明人： Thomas L. Toth ,  John Eric Tkaczyk ,  Jiang Hsieh

    IPC分类号： G21K3/00 ,  A61B6/03

    CPC分类号： A61B6/4042 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4488 ,  G01T1/2985 ,  G21K1/04 ,  G21K1/10

    摘要： A method and apparatus for tailoring the profile of an x-ray beam for radiographic imaging for a specific subject is disclosed. The invention includes a filter assembly having a pair of filters, each of which may be dynamically controlled by a motor assembly during data acquisition. The filters are positionable in the x-ray beam so as to shape the intensity profile of the x-ray beam. In one exemplary embodiment, the filters are dynamically positioned during CT data acquisition based on the shape of the subject. A method of determining the shape of the subject prior to CT data acquisition is also disclosed.

    摘要翻译： 公开了一种用于定制用于特定对象的X射线成像的X射线束的轮廓的方法和装置。 本发明包括具有一对滤波器的滤波器组件，每个滤波器可以在数据采集期间由电机组件动态地控制。 过滤器可以定位在x射线束中，以便形成x射线束的强度分布。 在一个示例性实施例中，基于对象的形状，在CT数据采集期间，滤波器被动态地定位。 还公开了在CT数据采集之前确定对象的形状的方法。

    System and method of mitigating low signal data for dual energy CT
    7.
    发明授权
    System and method of mitigating low signal data for dual energy CT 有权
    减轻双能量CT的低信号数据的系统和方法

    公开(公告)号：US08199874B2

    公开(公告)日：2012-06-12

    申请号：US12635901

    申请日：2009-12-11

    申请人： Thomas L. Toth ,  Jiang Hsieh ,  Naveen Chandra ,  Xiaoye Wu

    发明人： Thomas L. Toth ,  Jiang Hsieh ,  Naveen Chandra ,  Xiaoye Wu

    IPC分类号： A61B6/00 ,  H05G1/64

    CPC分类号： A61B6/405 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4241 ,  A61B6/4266 ,  A61B6/4411 ,  A61B6/482 ,  G01T1/2985 ,  G06T11/005 ,  G06T2211/408

    摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller configured to obtain kVp projection data at a first kVp, obtain kVp projection data at a second kVp, extract data from the kVp projection data obtained at the second kVp, add the extracted data to the kVp projection data obtained at the first kVp to generate mitigated projection data at the first kVp, and generate an image using the mitigated projection data at the first kVp and using the projection data obtained at the second kVp.

    摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架，以及控制器，被配置为在第一kVp处获得kVp投影数据，在第二kVp处获得kVp投影数据，从在 第二kVp，将提取的数据加到在第一kVp处获得的kVp投影数据，以在第一kVp处产生减轻的投影数据，并使用第一kVp处的减轻投影数据并使用在第二kVp获得的投影数据生成图像 kVp。

    SYSTEM AND METHOD OF ACQUIRING MULTI-ENERGY CT IMAGING DATA
    8.
    发明申请
    SYSTEM AND METHOD OF ACQUIRING MULTI-ENERGY CT IMAGING DATA 有权
    获取多能CT成像数据的系统和方法

    公开(公告)号：US20110142194A1

    公开(公告)日：2011-06-16

    申请号：US12760862

    申请日：2010-04-15

    申请人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    发明人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    IPC分类号： A61B6/03

    CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/482

    摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller configured to apply a first kVp for a first time period, apply a second kVp for a second time period, wherein the second time period is different from the first time period, acquire a first asymmetric view dataset during at least a portion of the first time period, acquire a second asymmetric view dataset during at least a portion of the second time period, and generate an image using the acquired first and second asymmetric view datasets.

    摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架，以及被配置为在第一时间段施加第一kVp的控制器，在第二时间段施加第二kVp，其中第二时间段是不同的 从所述第一时间段在所述第一时间段的至少一部分期间获取第一非对称视图数据集，在所述第二时间段的至少一部分期间获取第二非对称视图数据集，并且使用所获取的第一和第二时间段生成图像 非对称视图数据集。

    Methods and apparatus for noise compensation in an imaging system
    9.
    发明授权
    Methods and apparatus for noise compensation in an imaging system 有权
    成像系统中噪声补偿的方法和装置

    公开(公告)号：US6061419A

    公开(公告)日：2000-05-09

    申请号：US139833

    申请日：1998-08-25

    申请人： Jiang Hsieh ,  Thomas L. Toth

    发明人： Jiang Hsieh ,  Thomas L. Toth

    IPC分类号： A61B6/03

    CPC分类号： A61B6/4085 ,  A61B6/032 ,  Y10S378/901

    摘要： Methods and apparatus for performing channel dependent and gain dependent smoothing filter (across channels) to compensate for noise in a multislice imaging system are described. The smoothing mainly affects the radial resolution. The filter can be combined with the matrix deconvolution filter typically used in multi-slice scanners. The filter is channel and DAS gain dependent and provides that an image generated from data collected in a multi-slice scan has about the same image quality, e.g., noise reduction, as images generated by other types of scanners.

    摘要翻译： 描述了用于执行通道相关和增益依赖的平滑滤波器（跨通道）以补偿多层成像系统中的噪声的方法和装置。 平滑主要影响径向分辨率。 滤波器可以与通常用于多切片扫描仪的矩阵去卷积滤波器组合。 滤波器是通道和DAS增益相关的，并且提供从在多切片扫描中收集的数据生成的图像具有与其他类型的扫描仪产生的图像具有相同的图像质量（例如降噪）。

    SYSTEM AND METHOD OF ACQUIRING MULTI-ENERGY CT IMAGING DATA
    10.
    发明申请
    SYSTEM AND METHOD OF ACQUIRING MULTI-ENERGY CT IMAGING DATA 有权
    获取多能CT成像数据的系统和方法

    公开(公告)号：US20120236984A1

    公开(公告)日：2012-09-20

    申请号：US13484707

    申请日：2012-05-31

    申请人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    发明人： Naveen Chandra ,  Xiaoye Wu ,  Thomas L. Toth ,  Jiang Hsieh

    IPC分类号： A61B6/03

    CPC分类号： A61B6/4035 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/482

    摘要： A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, and a controller. The controller is configured to apply a first kVp for a first time period, apply a second kVp for a second time period, integrate two or more view datasets during the first time period, integrate one or more view datasets during the second time period, and generate an image using the datasets integrated during the first time period and during the second time period.

    摘要翻译： CT系统包括具有用于接收待扫描物体的开口的可旋转机架和控制器。 控制器被配置为在第一时间段内施加第一kVp，在第二时间段施加第二kVp，在第一时间段期间集成两个或更多个视图数据集，在第二时间段期间集成一个或多个视图数据集;以及 使用在第一时间段期间和第二时间段期间集成的数据集生成图像。