螺旋锥束CT中两种解析重建算法的研究

摘要

研究了锥束螺旋Katsevich和FDK重建算法,并对这两种算法进行比较.实验结果表明:当投影数据没有噪声的时候,FDK算法和Katsevich算法均能取得较好的效果,当对实际物体进行重建的时候,投影数据含有噪声,Katsevich算法需要对投影数据求导,而它对投影数据的噪声较敏感,重建质量有所下降.%The Katsevich and FDK reconstruction algorithms for cone-beam spiral scan were studied and compared. The results showed that FDK algorithm and Katsevich algorithm obtained good results when the projection data did not contain noise; however, when the Katsevich algorithm was used to compute the derivative of the projection data containing noise for the reconstruction of actual object, the reconstruction quality declined because this algorithm was sensitive to the noise of projection data.