1. A method for reducing artifacts in image data generated by a computed tomography system, the artifacts being due to the presence of a high-density object in a subject of interest, the method comprising: receiving measured sinogram data from the computed tomography system, the sinogram data representative of a plurality of sinogram elements; reconstructing the measured sinogram data to generate initial reconstructed image data; generating corrected sinogram data using the measured sinogram data; and iteratively reconstructing the corrected sinogram data to generate improved reconstructed image data based on a weight measure associated with each sinogram element, wherein the weight measure is derived from the measured sinogram data.