The CT image is an important medical treatment of diseases,and CBCT has been widely used because of lower radiation dose.The paper analyzes and describes the widely applied FDK algorithm in CBCT,explores a new method to remove artifact images in the reconstructed result.This method calculates the count of back-projection for every point,and the FDK's reconstructed result is processed by setting weights based on the count.The experiment shows that the method can remove the artifact images,expand the reconstruction FOV (field of view).It works effectively and gets good results without affecting the precision of FDK algorithm.%使用CT成像进行疾病诊断是一种重要的医疗手段,而具有较小放射剂量的CBCT正在普及应用.针对CBCT广泛采用的FDK算法进行了分析和论述,提出了去除成像结果中伪影的一种改进方法.通过计算重建点反投影次数,对重建结果进行加权处理.实验结果表明,在不影响原有FDK算法重建精度的情况下有效地去除伪影,扩大重建FOV,取得了良好的效果.
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