Diagnostic Imaging (X-ray)
Radiography involves exposing a part of the body to a small dose of radiation to produce an image of the internal organs. When X-rays penetrate the body, they are absorbed in varying amounts by different parts of the anatomy.
Ribs, for example, will absorb much of the radiation and, therefore, appear white or light gray on the image. Lung tissue absorbs little radiation and appears dark on the image.
The exposed film is either placed in a developing machine, producing images much like the negatives from a 35-mm camera, or is digitally stored on computer.