Improved SIRT algorithm and its application to reconstruct image in underground magnetic CT

摘要

Underground Magnetic CT technique is a newly geophysical prospecting method widely used in detecting inner structure of geologic bodies. At present two most popular image reconstructing algorithms in computerized tomography are algebra reconstruction technology(ART) and simultaneous iterative reconstruction techniques(SIRT). Both of the two algorithms have their own drawbacks. In this paper we studied the theory of ART and SIRT technique, analyzed the causes of drawbacks of the two algorithms and then we improved SIRT algorithm by selecting the data processed by ART as initial value of iteration in SIRT. The result of the forward simulation showed that the improved method overcomes the instability of SIRT and enhanced accuracy of SIRT. At the end of this paper, we applied the improved SIRT method to reconstruct image in an electromagnetic prospecting.