Figure 12.

Simple dental step wedge test object with five different attenuation steps created using a dental spatula and different thicknesses of lead foil, taken from used dental film. A reproduction of the type of image that might be produced is also shown. The phantom is placed on top of the dental film at the end of the cone and an exposure taken with a standard setting. Subsequent exposures should be repeated under the same conditions, with the film placed on the same surface, as different scatter conditions may affect the image.