Radiographs, which are commonly called ‘X-rays’, are two-dimensional images of the body that are displayed as white, black, or varying shades of gray. Radiographs are utilized throughout all specialties of clinical medicine, and they are widely accessible and fairly inexpensive.

This module serves as an introduction to radiography. It discusses basic principles and will supply you with information to help you understand what you are looking at when you view an image. What causes a structure to look black, white, or gray on a radiograph?  Why are some structures seen better than others?

You can view individual sections of this module using the selections on the right.





1. How images are obtained

2. Factors affecting appearance

3. What anatomical structures are well seen

4. Indications for use