1. A non-transitory computer readable storage medium having stored thereon a computer program comprising instructions, which, when executed by a computer, cause the computer to: acquire projection data from a scanned object, the set of projection data comprising a plurality of projection measurements; calculate a set of modified statistical weights from the projection data, wherein a respective modified statistical weight of the set of modified statistical weights comprises a deviation from an inverse variance of a corresponding projection measurement of the projection data; and reconstruct an image of the scanned object using the set of modified statistical weights as coefficients in an iterative reconstruction algorithm; wherein the instructions further cause the computer to: define a set of conventional statistical weights from the plurality of projection measurements, wherein a respective conventional statistical weight of the set of conventional statistical weights comprises an inverse variance of a respective projection measurement of the plurality of projection measurements; and apply a nonlinear transformation function to the set of conventional statistical weights to generate the set of modified statistical weights.