What is a sinus x-ray?
A sinus x-ray is a type of x-ray used to obtain images of the sinuses. The sinuses are air-filled cavities lined with mucous membranes located within the bones of the skull.
During a sinus x-ray, x-rays pass through the sinuses and form an image on a special type of film. The sinuses are usually filled with air, which appears black on x-ray film. An opaque (whitened) area on an otherwise normal film may indicate the presence of sinusitis (inflammation of the mucous membranes of the sinuses), hemorrhage, tumor, or other problems.
As computerized tomography (CT scan) and magnetic resonance imaging (MRI) technologies are often able to provide improved imaging of the sinuses, the use of these scans may replace sinus x-rays in certain circumstances.
Other related procedures that may be used to evaluate problems of the sinuses include x-rays of the skull, CT scan of the brain, and MRI of the brain and spine. Please see these procedures for more information.
What is an x-ray?
X-rays use invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs on film. X-rays are made by using external radiation to produce images of the body, its organs, and other internal structures for diagnostic purposes. X-rays pass through body structures onto specially-treated plates (similar to camera film) and a "negative" type picture is made (the more solid a structure is, the whiter it appears on the film).
What are the sinuses?
The sinuses are cavities, or air-filled pockets, that are near the nasal passage. There are four different types of sinuses:
ethmoid sinus - located inside the face, around the area of the bridge of the nose. This sinus is present at birth, and continues to grow.
maxillary sinus - located inside the face, around the area of the cheeks. This sinus is also present at birth, and continues to grow.
frontal sinus - located inside the face, in the area of the forehead. This sinus does not develop until around seven years of age.
sphenoid sinus - located deep in the face, behind the nose. This sinus does not develop until adolescence.
The lining of the sinuses is similar to the lining of the nose.
Reasons for the Procedure
A sinus x-ray may be performed to detect injury or other problems in the sinuses, to assess inflammation or infection, or to determine the location and size of a tumor or other mass. The procedure may also be used to evaluate the patient after sinus surgery.
Advantages of a sinus x-ray are that it is simple, quick, non-invasive, relatively inexpensive, and can give the physician useful information. However, a disadvantage is that a sinus x-ray can determine only that a problem exists, not the specific cause of the problem.
There may be other reasons for your physician to recommend a sinus x-ray.
Risks of the Procedure
You may want to ask your physician about the amount of radiation used during the procedure and the risks related to your particular situation. It is a good idea to keep a record of your past history of radiation exposure, such as previous scans and other types of x-rays, so that you can inform your physician. Risks associated with radiation exposure may be related to the cumulative number of x-ray examinations and/or treatments over a long period of time.
If you are pregnant or suspect that you may be pregnant, you should notify your physician. Radiation exposure during pregnancy may lead to birth defects. If it is necessary for you to have a sinus x-ray, special precautions will be made to minimize the radiation exposure to the fetus.
There may be other risks depending on your specific medical condition. Be sure to discuss any concerns with your physician prior to the procedure.
Before the Procedure
Your physician will explain the procedure to you and offer you the opportunity to ask any questions that you might have about the procedure.
No fasting or sedation is required before the procedure.
Notify the radiologic technologist if you are pregnant or suspect that you may be pregnant.
Notify the radiologic technologist if you have a prosthetic (artificial) eye, because the prosthesis can create a confusing shadow on a sinus x-ray.
Based on your medical condition, your physician may request other specific preparation.