Improvement of bi-polynomial method for beam hardening correction based on consistency of CT data

Due to all kinds of correction algorithms have little effects on streak artifact at present, the reason of streak artifact is analyzed. Therefore, considering that the influences of soft tissue caused by the X-rays which penetrate through different bone thicknesses are different, the soft tissue correction polynomial in Bi-Polynomial correction method is improved based on H-L consistency condition. Forbid head phantom simulation results show that the improved algorithm can get better correction effect on both cupping artifact and streak artifact.