An X-ray is the original form of diagnostic imaging and the technology has been around since the
X-rays are invisible beams of electromagnetic energy that can pass through your body. They are absorbed in different amounts depending on the density of the material they pass through. Denser materials, such as bone and metal, show up as white on X-rays. The air in your lungs shows up as black. Fat and muscle appear as varying shades of gray.
They are most frequently used to assess bones and joints, as well as chest radiographs to image the heart, major blood vessels, lungs and rib cage.
X-ray technology is used in other types of diagnostic procedures, such as CT scans, and fluoroscopy (an X-ray ‘movie’).