基于小波的扇形束CT图像局部重建算法

Local Reconstruction Algorithm of Fan-Beam CT Images Based on Wavelet

提出一种基于小波的扇形束局部重建算法,首先插值获得的的投影数据,然后求得待重建图像的尺度系数和小波系数,对插值后的投影进行滤波,最后进行小波重构得到感兴趣区域的局部图像,该算法不仅减少了对检测物体辐射剂量,而且缩短了重建时间;最后比较了不同小波的重建效果,Cofflet2小波能获得更高质量的重建图像.

In this paper, it is puts forword a fan-beam local image reconstruction algorithm. Firstly,on the projection data interpolation. Secondly, seek to Scale coefficients and wavelet coefficient of the of the reconstruction image, then filter the projection of interpolation. Lastly, the wavelet reconstruction get interested in area of local image. This algorithm not only reduces the radiation dose detection object, and shorten the reconstruction time. Finally also compares the different wavelet reconstruction effect, Cofflet2 wavelet can obtain higher quality of reconstruction image.