1. A method for displaying image data for a myocardium of a heart, said method comprising: acquiring a three-dimensional (3D) projection dataset using a Computed Tomography (CT) imaging system; performing a segmentation of the 3D projection dataset to identify a plurality of voxels representing heart cavity voxels; performing a segmentation of the heart cavity voxels to identify a plurality of voxels representing myocardium voxels; grouping the myocardium voxels into viable clusters and potential non-viable clusters based on a density of the myocardium voxels; re-grouping each of the potential non-viable clusters into the viable clusters or non-viable clusters based on locations of the myocardium voxels included in the potential non-viable clusters with respect to the endocardium; and generating a 3D image of the myocardium using the viable clusters and the non-viable clusters.