1. A method of imaging an object of interest positioned in an exposure area, the method comprising: obtaining projection data by providing radiation to the exposure area and detecting at least some of the radiation exiting the object to form the projection data; arranging at least one density fiducial in the exposure area, prior to obtaining projection data, such that at least some of the radiation provided encounters the at least one density fiducial; obtaining first data based on information provided by the at least one density fiducial; modifying the projection data based, at least in part, on the first data; and reconstructing the modified projection data to form at least one image.