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.