Modified simultaneous algebraic reconstruction technique and its application to image reconstruction

摘要

Image reconstruction from projection is usually encountered in computerized tomography (CT) diagnosis. Based on the factors of economy and practicality, optical CT is now developing in the direction of reconstruction from fewer views or limited view range. However, in this condition, conventional simultaneous algebraic reconstruction technique (SART) has shown some shortcomings. A modified simultaneous algebraic reconstruction technique (MSART) is presented here, which takes into account not only the pixel value but also the segment length of the intersecting ray in error-correction procedure. The computer simulation makes comparing studies of SART and MSART. The results show that MSART solves the edge distortion effectively and makes encouraging improvement in reconstruction quality with sparse data. Even applied to image reconstruction from projection with noise, MSART works well.