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  Indian J Med Microbiol
 

Figure 8: Root mean square error of the images reconstructed by simultaneous algebraic reconstruction technique (after 6 iterations) and maximum likelihood expectation maximization (after 50 iterations), using three system matrix calculation methods of Siddon algorithm, the proposed line integral model, and hybrid model. The bars show the mean value of root mean square error for five different noise levels, while the error bars indicate the standard deviation

Figure 8: Root mean square error of the images reconstructed by simultaneous algebraic reconstruction technique (after 6 iterations) and maximum likelihood expectation maximization (after 50 iterations), using three system matrix calculation methods of Siddon algorithm, the proposed line integral model, and hybrid model. The bars show the mean value of root mean square error for five different noise levels, while the error bars indicate the standard deviation