Srprpr

where pj (r) denotes the ensemble average. The contribution of the noise to a reconstruction based on the weighted back-projection algorithm is obtained by application of the weighting function [see equations (5.27) and (5.28)]:

Now, drawing projections at random from the virtual bins (each containing the projection ensemble relating to a different direction), we can produce N different virtual reconstructions Bi and again define the variance according to

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