Radiology is the medical specialty devoted to creating images of the inside of the human body. To do this, radiologists uses a variety of energy sources, including x-ray, ultrasound, magnetic resonance, and nuclear.
Unlike docters who look inside the body with endoscopy and actually see internal structures, such as the stomach or the colon, radiologists use high-tech equipment to look into the body indirectly, in black and white. The goal of radiology is to detect internal problems, causing little harm and pain, before the condition becomes too serious.
Radiology, which began as a fascinating medical curiosity after the discovery of x-rays by Roentgen at the end of the 19th century, has exploded into an ever-expanding box of tools for "dismantling" the human body while it remains intact.