摘要
通过线阵探测器CT系统CD-300BX获得C/C复合材料多个角度下的扇形束CT扫描投影数据,设计并实现了滤波反投影算法。讨论了常用滤波函数和内插方式对CT重建质量的影响,采用峰值信噪比和平均梯度对CT图像重建质量进行客观评价,并与CT系统算法重建结果进行对比。研究结果表明:选用R-L滤波和紧邻内插时CT图像重建质量最好,本文开发的滤波反投影算法重建质量达到了CT系统的重建质量,可满足扇形束投影的CT重建需求。
Fan beam projection data of C/C composite from multiple angles were acquired by CT system with linear array detector which named CD - 300BX, and filtered backprojection algorithm was designed and implemented. The effects of classical filtering functions and interpolation functions on CT reconstruction quality were discussed, the qualities of CT images were evaluated objectively by peak signal to noise ratio and mean gradient, and compared with reconstruction algorithm of CT system. Experiments results show that the quality of CT images is the best in case of R-L filtering function and nearest neighbor interpolation function, the quality of CT image reconstructed in this paper has reached the quality of CT system, which will meet the requirement of CT reconstruction for fan beam projections.
出处
《失效分析与预防》
2013年第4期206-211,共6页
Failure Analysis and Prevention
基金
航空科技重点实验室开放基金(ZH201129001)
江西省教育厅科技项目(GJJ10533)
关键词
滤波反投影
扇形束投影
滤波函数
CT
平均梯度
filtered backprojection
fan beam projection
filtering function
computed tomography
mean gradient
