对6种常见的基函数展开通过计算机仿真分析、比较其重建效能.结果表明,对于少数投影计算机层析重建,采用连续可导的局部基函数展开比采用非连续可导的脉冲基函数展开具有更高的重建精度.而对于各种连续可导的基函数,其重建精度大致相当,基函数的选取应重点考虑其投影矩阵计算的难易程度.

The reconstructions based on 6 kinds of basis functions were compared by computer simulation. The result indicates that the reconstruction based on differentiable basis function is better than that based on non-differentiable basis function and the reconstructions based on different differentiable basis function is approximately the same. The computation of projection matrix is mostly considered for the choice of basis functions.