For this purpose, two metrics are employed, both metrics use the root mean square error(RMSE) of the reconstructed attenuation coefficient minus the known attenuation coefficientof the phantom at each pixel, the first metric is obtained dividing the RMSE by the totalnumber of pixels, N, in the model and in the second metrics is the division of RMSE by rootof the sum of squares of known attenuation coefficient at each pixel. The procedure describedcan be said that it is RMSE space resolution, since it compares results in base of their spatialvalues. The mathematical formulations of the metrics are
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