Adaptive filter for reducing streaking artifacts in x-ray tomographic
images
    72.
    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

    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
    78.
    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

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

    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
    79.
    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

    IPC分类号: A61B6/03

    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。

    Method and apparatus for computed tomography
    80.
    发明授权
    Method and apparatus for computed tomography 有权
    计算机断层扫描的方法和装置

    公开(公告)号:US08031828B1

    公开(公告)日:2011-10-04

    申请号:US12771875

    申请日:2010-04-30

    IPC分类号: A61B6/00

    摘要: In one embodiment, a first set of projection data is acquired using a first portion of a detector and a second set of projection data is acquired using a second portion of the detector. The second set of projection data is supplemented based upon the first set of projection data to generate a supplemented set of projection data. A volumetric image may be generated using the supplemented set of projection data.

    摘要翻译: 在一个实施例中,使用检测器的第一部分获取第一组投影数据,并且使用检测器的第二部分获取第二组投影数据。 基于第一组投影数据补充第二组投影数据,以生成补充的一组投影数据。 可以使用补充的投影数据集生成体积图像。