How Do Chest X-rays Work?
X-rays are a form of electromagnetic radiation, similar to visible light. During a chest x-ray, x-ray beams penetrate your chest and then form an image on highly sensitized film.
Different structures inside the chest will appear differently on the film. Those that are dense (such as bone) will appear white, as will metal or contrast dye. Abnormalities such as air will appear black, and muscle, fat and fluid will be different shades of gray.
X-rays provide a wealth of information about many different types of abnormalities within the chest, including obstructions, tumors, and other diseases.
How the Test is Performed
A chest x-ray is usually performed at a radiology center or doctor's office by a radiology technician. If you are in the hospital, the test is usually performed at the bedside. The x-ray technician will inform you as to what position you should lie in, depending upon which views of the chest are ordered. You will be asked to hold your breath and not move while the technician obtains the x-ray. The test is over within seconds.
How to Prepare for a Chest X-ray
You will be asked to put on a patient gown and remove any metal from your body, including jewelry. If you are female, you should inform the technician if you think you are pregnant or have an IUD inserted.
What About Risks?
During a chest x-ray, there is a slight risk of cancer or damage to reproductive cells. Most experts feel that the benefits gained from a chest x-ray outweigh the risks.
Source:
Illustrated Guide to Diagnostic Tests. Springhouse, 1998.
