Radiology
Certain radiographic features are used to determine the nature of an object seen on the x-ray film. These features are used to determines both normal anatomy as well as pathologic alterations and should be evaluated for every structure examined on the radiograph. These characteristics include size, shape, density, position, and architecture. Density is the mass of a structure per unit volume. It is a major factor in determining the amount of radiation that various object absorb. Objects that absorbs most or all the radiation impinging upon them are termed radiopaque . The photons do not pass through these object and therefore neither reach nor expose the x-ray film. These structures produce a clear area on the film, which appear white or light gray when viewed. Object that permit most of the radiation to pass through them are termed radiolucent and produce a black or dark gray image on the x-ray film. In terms of radiographic density, the animal may be considere