有限角CT重构压缩算法及仿真分析

The Analysis of Squashing Algorithm for Limited Angle Projection Reconstruction by Simulation

研究了有限角 CT重构压缩算法中有限角度和投影幅数对重构结果的影响 .通过仿真程序 ,对不同的有限角度和投影幅数下的压缩重构结果进行分析和比较 ,得出不同的有限角度和投影幅数下重构质量有很大的不同 .当缺失角大于等于 3 0°时 ,重构质量很差 .

The effect of the limited angle and the number of projections in squashing algorithm for limited angle projection reconstruction are studied. Via simulations, the reconstructed images under different limited angle and the different number of projections by the squashing algorithm are analysed and compared. It is shown that the quality of the reconstructed image has large difference between the different limited angle and the different numbers of projection. When the lost angle is equal to 30° or larger than, the quality of the reconstructed image are deteroited badly. It illuminates that the squashing algorithm is valid only in a narrow fields.