基于Klein-Nishina(K-N)公式对康普顿散射截面的描述,结合比尔定律,分别计算在物体内部设定的每一个散射点对探测器所有探元造成的散射分布的概率,叠加所有散射点造成的散射分布概率,引入调节系数,求出总散射分布,最后从投影数据中减去散射分布,实现散射伪影的校正。通过仿真和实验验证,该方法能够明显抑制散射造成的杯状伪影与阴影,提高重建图像的质量。

Based on the description of Compton scattering cross section by Klein-Nishina(K-N) formula and combining with Beer law, the probability of scattering distribution caused by each scattering point set in the object to all detector elements is calculated respectively, and the probability of scattering distribution caused by superimposing all scattering points is calculated. The total scattering distribution is obtained by adjustment of the coefficients. Finally, the scattering distribution is reduced from projection data, and the correction of scattering artifacts is achieved. The results from simulation and experimental show that the proposed method can significantly suppress the artifacts and shadows with shape of cup caused by scattering and improve the quality of reconstructed images.