The Lung-Spine Phantom consists of two chambers that are shaped to simulate the lungs. The chamber can be filled with Styrofoam beads and water that mimics the lung tissue. When filled with Styrofoam® beads and a radioactive solution, the lung chambers simulate lung tissue with density of ~ 0.3 gm/cm3 and with any desirable radioactivity concentration. The Lung-Spine Phantom can be used with the optional Cardiac Insert (as shown) to realistically simulate the attenuation coefficients of any radioactivity uptake in various tissue in the human upper torso. Cardiac Insert is available separately.