本文提出一种新的CT重建法——非均匀反投影重建法。新方法与通常的均匀反投影重建方法不同,它不是把投影差值均匀地分配给有关象素,而是根据象素的灰度加权系数非均匀地分配投影差值。这种新的重建方法使重建象的质量有明显改善,特别是在投影方向数较少的非完全投影情况下,改善效果更加明显。 This paper presents a new CT reconstruction method - non-uniform backprojection reconstruction method. Unlike the conventional uniform backprojection reconstruction method, the new method does not distribute the projection difference evenly to the pixel concerned, but allocates the projection difference non-uniformly according to the pixel’s gray scale weighting coefficient. This new reconstruction method has greatly improved the quality of the reconstructed image, especially in the case of the incomplete projection with a small number of projection directions.