为获得更高质量的CT重建图像，建立了基于结构先验的变电压CT成像方法。该方法对同一像素点在不同电压下满足最佳灰度带的有效投影数据进行叠加迭代重建，得到递变电压的重建结果，通过设定阈值，将低电压下投影数据的重建结果分为两个部分，将边缘的结构部分先验地运用到高电压下投影数据的重建结果里，以此弥补变电压重建图像过程中的信息缺失。仿真实验表明：该方法能够获得完整的工件信息，重建图像质量高，像素值也更加稳定。%The method of variable voltage CT reconstruction is to obtain projection sequence matching the effec -tive thickness of work piece under variable voltage and to construct it .Firstly, we use the efficient projection of the same pixel under different voltages meeting the best condition to reconstruct .So we can get variable voltage reconstruction .Then by setting threshold , the reconstruction of the projection data under low voltage can be di-vided into an edge portion and a non -edge section and the edge portion priors to applying to the reconstruction of the projection data under high voltage in order to make up for the missing information .Experiment shows that that this method can obtain the complete information of work piece , the quality of reconstructed image is higher and the pixel values are more stable .
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