What anatomical structures are well seen with radiography  
 

Radiodense structures are easy to evaluate on radiography. Examples of these include bone, calcium, barium and metal.

Radiolucent structures are also easy to evaluate. Examples of these include air and fat.

Structures of intermediate density, which appear varying shades of gray, are harder to evaluate. How well they are seen on radiographs depends on what structures they are next to. Examples of these include fluid and soft tissues, such as the abdominal solid organs and muscles.

If two structures of similar densities are adjacent to one another, they appear as the same shade of gray and cannot be differentiated. In contrast, adjacent structures of differing densities can be distinguished quite easily.