1. A method comprising: receiving, in an image processing system, a three-dimensional (3D) image of an anatomy portion of a patient based on computed tomography (CT) projections of the patient; identifying a cluster of voxels forming an implant candidate on a CT slice of the 3D image, wherein the cluster of voxels is an artifact of an implant in the patient; comparing characteristics of the cluster of voxels of the implant candidate to characteristics of artifacts of a plurality of implants, wherein the characteristics of the artifacts are stored in a memory of the image processing system; based on the comparing of the characteristics of the cluster of voxels to the characteristics of the artifacts of the plurality of implants, selecting a best-fit implant from the plurality of implants; and overlaying a graphical image of the best-fit implant on the implant candidate of the CT slice displayed on a display of the image processing system.