DOI: 10.3724/SP.J.1249.2017.03284

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2017/34:3 PP.284-289

A new filter function for the image reconstruction of cone beam X-ray CT

The conventional filter function of the FDK algorithm in X-ray computed tomography (CT) can result in the obvious Gibbs phenomenon, which has great effect on the CT image. A NEW-MS-L filter function is deduced based on the rationale of mixed filter theory and weighted average theory. First, the S-L filter function is weighted and averaged to form M3S-L filter function.Then, as a superposition of the M3S-L filter function and the NEW filter function, the NEW-MS-L filter function is obtained. Compared with the other filter functions such as NEW, R-L-S-L, R-L-NEW, and R-L-MS-L, the NEW-MS-L can suppress the Gibbs phenomenon while maintaining high resolution. The results show that the NEW-MS-L filter function can provide X-ray CT with better reconstruction images.

Key words:optical engineering,computed tomography,FDK algorithm,filter function,Gibbs phenomenon,mixed filter theorem,weighted average theorem

ReleaseDate:2017-06-16 14:08:44

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