1. A method for controlling image reconstruction in an imaging system, said method comprising: receiving scan data; and determining, based on the received scan data, at least one of regularization parameters and potential functions for a plurality of portions of an image to be reconstructed, wherein the at least one of regularization parameters and potential functions vary for the plurality of portions of the image to be reconstructed; wherein the at least one of regularization parameters and potential functions is determined from the received scan data prior to any image reconstruction of the received scan data being performed.