The Cardiac Insert is designed to be used with the various Data Spectrum circular and elliptical cylinders, the Elliptical Lung-Spine Body Phantom, and the Anthropomorphic Torso Phantom. The product simulates normal and abnormal myocardial uptake and radioactivity in regards to the left ventricular chamber. The solid inserts simulate transmural and nontransmural cold abnormalities. Fillable inserts can also be used to simulate transmural and nontransmural cold or hot abnormalities.