An X-ray is a form of radiated energy that can pass through human tissues. It cannot be seen with the naked eye, but can be picked up on photographic film or electronic sensor. Although you may think of an X-ray as a picture of bones, doctors are trained to see air spaces, like the lungs (which look black) and fluid (which looks white, but not as white as bones).
What to expect?
You will have all metal objects removed from your body. You will be asked to remain still in a specific position and hold your breath. There are staff present, but they will not necessarily remain in the room, but will speak with you via an intercom system and will be watching you constantly through a window in the control room.
The examination time will vary depending on the type of procedure required, but as a rule it will take around 30 minutes.