An X-ray is a form of electromagnetic radiation, similar to light but with a shorter wavelength and capable of penetrating solids. It is the most common form of medical imaging and most people have had one by the time they are an adult, whether for a suspected broken bone or at the dentist. This painless, non-invasive diagnostic test uses a controlled beam of radiation that interacts with matter. A radiation detector records the amount of radiation that passes through (or doesn't, depending on whether it's tissue or bone) and provides a picture of the body area under review in different shades of black and white. The results of your X-ray will then be given to a radiologist for interpretation.