The Anthropomorphic Torso Phantom is used for the evaluation of non-uniform attenuation and scatter compensation methods. The phantom consists of a large, body-shaped cylinder with lung, liver and spine inserts. The phantom simulates the anatomical structures of radioactivity distributions for the upper torso of average to large male/female patients. Lung inserts can be filled with Styrofoam® beads and water to simulate lung tissue density. When used with the optional Cardiac Insert, cardiac ECT data acquisition and reconstruction methods may also be evaluated.