1. A method for calculating an MR image of a target layer from an examination object, wherein the MR image is calculated using iterative reconstruction, the method comprising: acquiring MR data from an initial layer of the examination object; determining information produced by the examination object from the acquired MR data of the initial layer; determining a penalty term from the determined information produced by the examination object; and performing the iterative reconstruction of the MR image for the target layer, taking into account the determined penalty term.