An automatic dispersing device for dispersing an aerosol from a container having a spring-loaded or pressure biased valve top. In one embodiment, a plurality of compartments with different concentrations of contrast material corresponding to a density curve of blood perfusion of a healthy tissue are positioned-in a screening field of a CT machine so the CT machine images the compartments when it linages the healthy tissue. The cooling vanes create additional surface area for air to come into contact with, thereby allowing more efficient cooling of the at least one LED.