X-RAY CT APPARATUS AND IMAGE RECONSTRUCTION METHOD
    1.
    发明申请
    X-RAY CT APPARATUS AND IMAGE RECONSTRUCTION METHOD 有权
    X射线CT设备和图像重建方法

    公开(公告)号:US20160183900A1

    公开(公告)日:2016-06-30

    申请号:US14905057

    申请日:2014-07-24

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

    摘要: In an FFS method that improves spatial resolution by moving an X-ray focal spot to multiple positions to acquire projection data, in order to provide an X-ray CT apparatus and an image reconstruction method that enables to improve spatial resolution of the entire effective field of view without reducing a rotational speed, the X-ray focal spot in the X-ray tube device 101 is shifted to acquire focal shift projection data (FFS projection data), the virtual view generation unit 126 up-samples the FFS projection data (generates a virtual view) in the view direction, and the reconstruction computing unit 127 reconstructs an image using actual data of the FFS projection data in the central region 604 closer to the image center than a predetermined boundary and using the up-sampled projection data in the peripheral region 603 outside the boundary in an image reconstruction computing process.

    摘要翻译: 在通过将X射线焦点移动到多个位置以获取投影数据来提高空间分辨率的FFS方法中,为了提供能够提高整个有效场的空间分辨率的X射线CT装置和图像重建方法, 在不降低旋转速度的情况下,X射线管装置101中的X射线焦斑被移位以获得焦点偏移投影数据(FFS投影数据),虚拟视图生成单元126对FFS投影数据进行上采样 在视野方向生成虚拟视图),重建计算单元127使用比预定边界更靠近图像中心的中心区域604中的FFS投影数据的实际数据来重建图像,并且使用上采样的投影数据 外围区域603在图像重建计算处理中的边界外。