1. A method for displaying image data for a tissue of an organ, 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 that includes a plurality of voxels; performing a perfusion viability cluster analysis to identify myocardium voxels; grouping the myocardium voxels into viable clusters and non-viable clusters based on a density and a location of the myocardium voxels; and generating a 3D image of the myocardium and a coronary tree using the viable clusters and the non-viable clusters.