1. A method for generating images for identifying cardiac calcification, the method comprising: receiving a three-dimensional computer tomography (CT) image of at least a portion of a body of a patient; performing a 3-dimensional (3D) translation and rotation on the CT image; projecting the CT image onto an image plane to generate a 2-dimensional (2D) digitally reconstructed radiography (DRR) image; performing a 2D transformation on the 2D DRR image; and measuring similarities of the 2D DRR with a dual-energy digital radiography (DEDR) image to facilitate the identification of cardiac calcification.