利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

353 条记录 (耗时 0.045 秒)

    Adaptive filter for reducing streaking artifacts in x-ray tomographic images
    92.
    发明授权
    Adaptive filter for reducing streaking artifacts in x-ray tomographic images 失效
    自适应滤波器，用于减少X射线断层图像中的条纹伪像

    公开(公告)号：US5416815A

    公开(公告)日：1995-05-16

    申请号：US87568

    申请日：1993-07-02

    申请人： Jiang Hsieh

    发明人： Jiang Hsieh

    IPC分类号： A61B6/03 ,  G01N23/04 ,  G01N23/083

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

    摘要： Streaking artifacts in a computed tomography x-ray image are reduced by adaptively filtering each set of projection data. The adaptive filter produces an error vector (.theta.) by low-pass filtering the projection data (P) and subtracting the error vector (.theta.) from the projection data (P) prior to image reconstruction. A window function generator controls the low-pass filter as a function of x-ray detector readings.

    摘要翻译： 通过对每组投影数据进行自适应滤波，减少计算机断层摄影X射线图像中的伪像。 自适应滤波器通过对投影数据（P）进行低通滤波并在图像重建之前从投影数据（P）中减去误差向量（θ）来产生误差向量（θ）。 窗口函数发生器控制低通滤波器作为x射线探测器读数的函数。

    System and method of acquiring multi-energy CT imaging data
    95.
    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。

    SYSTEM AND METHOD OF SPECTRAL CALIBRATION AND BASIS MATERIAL DECOMPOSITION FOR X-RAY CT SYSTEMS
    96.
    发明申请
    SYSTEM AND METHOD OF SPECTRAL CALIBRATION AND BASIS MATERIAL DECOMPOSITION FOR X-RAY CT SYSTEMS 有权
    X射线CT系统的光谱校准和基础材料分解系统与方法

    公开(公告)号：US20120069952A1

    公开(公告)日：2012-03-22

    申请号：US12883631

    申请日：2010-09-16

    申请人： Xiaoye Wu ,  Dan Xu ,  Naveen Chandra ,  Zhanyu Ge ,  Jiang Hsieh ,  Daniel David Harrison ,  Mary Sue Kulpins

    发明人： Xiaoye Wu ,  Dan Xu ,  Naveen Chandra ,  Zhanyu Ge ,  Jiang Hsieh ,  Daniel David Harrison ,  Mary Sue Kulpins

    IPC分类号： A61B6/03

    CPC分类号： A61B6/583 ,  A61B6/032 ,  A61B6/482 ,  A61B6/585

    摘要： An imaging system includes an x-ray source that emits a beam of x-rays toward an object, a detector that receives high frequency electromagnetic energy attenuated by the object, a data acquisition system (DAS) operably connected to the detector, and a computer operably connected to the DAS. The computer is programmed to compute detector coefficients based on a static low kVp measurement and a static high kVp measurement, capture incident spectra at high and low kVp during fast kVp switching, compute effective X-ray incident spectra at high and low kVp during fast kVp switching using the captured incident spectra, scan a water phantom and normalize the computed detector coefficients to water, adjust the computed effective X-ray incident spectra based on the normalized detector coefficients, compute basis material decomposition functions using the adjusted X-ray incident spectra, and generate one or more basis material density images using the computed basis material decomposition functions.

    摘要翻译： 成像系统包括：x射线源，其朝向物体发射X射线束;接收被物体衰减的高频电磁能的检测器;可操作地连接到检测器的数据采集系统（DAS）;以及计算机 可操作地连接到DAS。 计算机被编程为基于静态低kVp测量和静态高kVp测量来计算检测器系数，在快速kVp切换期间在高和低kVp处捕获入射光谱，在快速kVp期间计算高和低kVp处的有效X射线入射光谱 使用捕获的入射光谱切换，扫描水体模型并将计算的检测器系数归一化为水，基于归一化的检测器系数调整计算的有效X射线入射光谱，使用调整的X射线入射光谱计算基础材料分解函数， 并使用所计算的基础材料分解函数生成一个或多个基础材料密度图像。

    APPARATUS AND METHOD FOR SPECTRAL PROJECTION IMAGING WITH FAST KV SWITCHING
    97.
    发明申请
    APPARATUS AND METHOD FOR SPECTRAL PROJECTION IMAGING WITH FAST KV SWITCHING 有权
    用快速KV切换进行光谱投影成像的装置和方法

    公开(公告)号：US20110150175A1

    公开(公告)日：2011-06-23

    申请号：US12642945

    申请日：2009-12-21

    申请人： Jiang Hsieh ,  Naveen Chandra ,  Steven J. Woloschek ,  Robert F. Senzig

    发明人： Jiang Hsieh ,  Naveen Chandra ,  Steven J. Woloschek ,  Robert F. Senzig

    IPC分类号： H05G1/60 ,  G06K9/00

    CPC分类号： A61B6/482 ,  A61B6/4021 ,  A61B6/4266 ,  A61B6/488 ,  G01T1/2985

    摘要： A CT system includes a gantry, an x-ray source configured to project x-rays toward an object, an x-ray detector positioned to receive x-rays from the x-ray source that pass through the object, a generator configured to energize the x-ray source to a first voltage and to a second voltage that is distinct from the first voltage, and a controller configured to cause the gantry to position the source and generator at a circumferential position during an imaging session, pass the object through the opening during the imaging session, cause the generator to energize the x-ray source to the first voltage and to the second voltage, acquire imaging data while the generator energizes the x-ray source to the first voltage and to the second voltage while the rotatable gantry is at the circumferential position, and generate an image using the imaging data.

    摘要翻译： 一个CT系统包括一个配置成将x射线投射到物体的台架，x射线源，x射线探测器，其被定位成从X射线源接收穿过物体的x射线， x射线源到第一电压和不同于第一电压的第二电压;以及控制器，其被配置为使得台架在成像会话期间将源和发生器定位在圆周位置，使物体通过 在成像会话期间打开，使得发生器将x射线源激励到第一电压和第二电压，获取成像数据，同时发生器将X射线源激励到第一电压和第二电压，同时可旋转 龙门架处于圆周位置，并使用成像数据生成图像。

    ADAPTIVE GRADIENT WEIGHTING TECHNIQUE FOR DETECTOR BAD CELL CORRECTION
    98.
    发明申请
    ADAPTIVE GRADIENT WEIGHTING TECHNIQUE FOR DETECTOR BAD CELL CORRECTION 有权
    用于检测器BAD细胞校正的自适应梯度称重技术

    公开(公告)号：US20110116700A1

    公开(公告)日：2011-05-19

    申请号：US13009584

    申请日：2011-01-19

    申请人： Baojun Li ,  Jiang Hsieh

    发明人： Baojun Li ,  Jiang Hsieh

    IPC分类号： G06K9/00 ,  G06F19/00

    CPC分类号： G01T1/2985

    摘要： An imaging system includes a two-dimensional detector having a plurality of cells wherein each cell is configured to detect energy or signal passing through an object. The imaging system includes a computer programmed to acquire imaging data for the plurality of cells, identify a cell to be corrected, based on the imaging data, interpolate Ix and Iy for the identified cell based on neighbor cells, and calculate local gradients gx and gy between the identified cell and its neighbor cells based on the interpolation. The computer is further programmed to calculate weighting factors wx and wy based on the local gradients, calculate a corrected final value I(0,0) for the identified cell, and correct the identified cell with the corrected final value.

    摘要翻译： 成像系统包括具有多个单元的二维检测器，其中每个单元被配置为检测通过物体的能量或信号。 成像系统包括被编程为采集多个单元的成像数据的计算机，基于成像数据识别要校正的单元，基于相邻单元对所识别的单元插值Ix和Iy，并计算局部梯度gx和gy 基于内插，在所识别的小区及其相邻小区之间。 计算机还被编程为基于局部梯度计算加权因子wx和wy，计算所识别的单元的校正后的最终值I（0,0），并用校正的最终值校正所识别的单元。

    Methods and apparatus for reconstructing thick image slices
    99.
    发明授权
    Methods and apparatus for reconstructing thick image slices 失效
    用于重建厚图像切片的方法和装置

    公开(公告)号：US07646842B2

    公开(公告)日：2010-01-12

    申请号：US11233670

    申请日：2005-09-23

    申请人： Jiang Hsieh ,  Xiangyang Tang

    发明人： Jiang Hsieh ,  Xiangyang Tang

    IPC分类号： A61B6/00

    CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  G01N2223/419 ,  G06T11/005

    摘要： A method for obtaining data includes scanning an object using a CT imaging system having at least two detector rows to acquire projection data, wherein the projection data includes at least some data obtained from at least two rows of the detector array, and reconstructing data representative an image of the object utilizing the projection data wherein the reconstruction includes pipelining the acquired projection data through a pipeline of operations including column-filtering, tomographic filtering, and backprojection. Thick reconstructed images using 3D backprojection can be obtained with significantly lessened artifacts relative to conventional 3D backprojection image reconstructions.

    摘要翻译： 一种用于获取数据的方法包括使用具有至少两个检测器行的CT成像系统来扫描物体以获取投影数据，其中所述投影数据包括从所述检测器阵列的至少两行获得的至少一些数据，以及重建表示 使用投影数据的对象的图像，其中重建包括通过包括列过滤，断层扫描和反投影的操作流水线对所获取的投影数据进行流水线化。 相对于传统的3D反投影图像重建，可以获得使用3D反投影的厚重构图像，并显着减少伪像。