Method of reconstructing CT image data
    1.
    发明授权
    Method of reconstructing CT image data 有权
    重建CT图像数据的方法

    公开(公告)号:US08005287B2

    公开(公告)日:2011-08-23

    申请号:US12457972

    申请日:2009-06-26

    IPC分类号: G06K9/00 A61B6/00 A61B5/05

    CPC分类号: G06T11/006 G06T2211/424

    摘要: A method is disclosed for reconstructing CT image data. In at least one embodiment, the method includes providing measured CT projection data p based on the CT projection data p, reconstructing first CT image data fk=1, and on the basis of the first image data fk=1 iteratively generating k+1-th CT-image data according to the formula: fk+1=fk−α(Q(Pfk−p)+βR(fk)) until the standard ∥fk+1−fk∥2 is ≦n, with the reconstruction operator Q containing a noise weighting according to Q=B·Wstatist.·H. Aside from suppressing “cone” artifacts, the proposed method of at least one embodiment indicates a significant reduction in the image noise even after a few iterations.

    摘要翻译: 公开了一种重建CT图像数据的方法。 在至少一个实施例中,该方法包括基于CT投影数据p提供测量的CT投影数据p,重建第一CT图像数据fk = 1,并且基于第一图像数据fk = 1迭代地生成k + 根据以下公式计算CT图像数据:fk + 1 = fk-α(Q(Pfk-p)+&bgr; R(fk)),直到标准∥fk+ 1-fk‖2为≦̸ n, 重构算子Q根据Q = B·Wstatist包含噪声加权。 除了抑制“锥形”伪像之外,至少一个实施例的所提出的方法指示即使在几次迭代之后图像噪声也显着降低。