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在实际的ＣＴ重建中，由于受散射、射束硬化等低频干扰因素的影响，使得重建图像产生“杯状”伪像以及图像模糊降质。针对在ＩＣＴ工程实践中投影数据存在诸如此类的低频污染问题，本文提出了一新型实用滤波函数取代传统的滤波函数，得到了较为满意的重建效果。
In the actual CT reconstruction, due to scattering, beam hardening and other low-frequency interference factors, making the reconstruction of images produce “cup-like” artifacts and image blur degradation. In order to solve the problem of low frequency pollution such as projection data in the practice of ICT engineering, a new type of practical filter function is proposed to replace the traditional filter function, and a satisfactory reconstruction result is obtained.