1. A computing device that is configured to reconstruct an image from a tomographic imaging system, comprising: a processor; a memory in electronic communication with the processor; instructions stored in the memory, the instructions being executable by the processor to perform a method, comprising: estimating a filtered back projection reconstruction of the image; specifying a statistical model for a conditional probability of the filtered back projection reconstruction of the image; and calculating a reconstruction of the image based on the estimated filtered back projection reconstruction and the conditional probability.