Image reconstruction method for a computed tomography apparatus
    21.
    发明授权
    Image reconstruction method for a computed tomography apparatus 失效
    计算机断层摄影装置的图像重建方法

    公开(公告)号:US5995580A

    公开(公告)日:1999-11-30

    申请号:US86151

    申请日:1998-05-28

    申请人: Stefan Schaller

    发明人: Stefan Schaller

    IPC分类号: A61B6/03 G06T1/00 G06T11/00

    摘要: An exact image reconstruction method for computed tomography allows the reconstruction of a sub-volume of interest in a long subject from cone beam or pyramid beam CT data using a spiral focus path. A two-stage reconstruction process is utilized that, by line integration over the detector, first calculates 3D radon values of a sub-volume of interest defined only for the respective .phi.-plane for each .phi.-plane of a 3D spherical coordinate system. For each .phi.-plane, the sub-volume of interest is limited toward the exterior by the radius of the measurement field and is upwardly and downwardly limited by curved surfaces that arise by the locus of a straight line perpendicular to the .phi.-plane under consideration proceeding to each focus point of a spiral segment.

    摘要翻译: 用于计算机断层摄影的精确图像重建方法允许使用螺旋聚焦路径从锥形束或金字塔束CT数据重建长对象中感兴趣的子体积。 利用两阶段重建过程,通过在检测器上的线集成,首先计算仅针对3D球面坐标系的每个phi平面的相应phi平面定义的感兴趣的子体积的3D氡值。 对于每个平面,感兴趣的子体积通过测量场的半径被限制到外部,并且由向下和向下限制的弯曲表面由垂直于所考虑的phi平面的直线的轨迹产生 进入螺旋段的每个焦点。

    Method for reconstructing projection data sets for dose-reduced sectional spiral scanning in computed tomography
    24.
    发明申请
    Method for reconstructing projection data sets for dose-reduced sectional spiral scanning in computed tomography 有权
    用于在计算机断层扫描中重建用于剂量减小的部分螺旋扫描的投影数据集的方法

    公开(公告)号:US20050254621A1

    公开(公告)日:2005-11-17

    申请号:US11116196

    申请日:2005-04-28

    摘要: In a method and CT apparatus and software product for reconstructing incomplete projection data sets for dose-reduced sectional spiral scanning along a axis of a patient on a table that is movable in the z direction in the CT apparatus that has a radiation source supplied with tube current so as to emit a beam that strikes a detector system to obtain scanning data from which in an image computing device generates two-dimensional and three-dimensional scanning images of the examination subject, at a pitch greater or equal to one. For z positions having an incomplete projection data set for reconstruction of the image, in a preprocessing step data from another row of this projection and/or data for a previous or subsequent 360° rotation are used to compute a complete projection data set therefor.

    摘要翻译: 在一种方法和CT装置和软件产品中,用于在CT装置中沿着z方向移动的桌子上沿着患者的轴线重建用于剂量减小的部分螺旋扫描的不完整投影数据集,所述CT装置具有供给管的辐射源 电流以发射撞击检测器系统的光束,以获得扫描数据,图像计算装置中的扫描数据以大于或等于1的间距产生检查对象的二维和三维扫描图像。 对于具有用于重建图像的不完整投影数据集的z位置,在预处理步骤中,使用来自该投影的另一行的数据和/或用于先前或后续360°旋转的数据来计算用于其的完整投影数据集。