Radiography refers to diagnostic exams that use x-rays to produce images of the human body. The most basic of the radiography exams are the diagnostic x-ray procedures. Although common, the x-ray has been called one of the most significant advances in all of medical history and is used in most every field of medicine to diagnose a variety of conditions. X-rays are a type of radiant energy, similar to light or radio waves. They are capable of penetrating the body, making it possible to capture pictures of internal structures.