CT of the Sinuses
Computed Tomography, or CT scan, combines x-rays with computer technology to create images of different bone and organ sections. Unlike standard x-rays which take a picture of the whole structure being examined, CT has the ability to image that same structure one “slice” at a time.
In standard x-rays, dense tissues like bones can block the view of the body parts behind them. In CT, the various slices clearly show both bone and underlying soft tissue. CT assists physicians in both diagnosis and detection of a variety of conditions at an early stage.
CT scanning can be used to obtain information about almost any body part. The amount of radiation used in CT exams is equivalent to that of standard x-ray procedures.
CT scanning is a non-invasive method of diagnosis for symptomatic patients with issues that require a view inside the body. It is a short, painless procedure and emits very low amounts of radiation.
When would I get a CT of the Sinuses?
CT of the sinuses is primarily used to:
- help diagnose and manage chronic or recurrent acute sinusitis, which is an inflammation or swelling of the tissue lining the sinuses
- detect inflammation or infection not seen by nasal endoscopy or x-ray
- detect structural abnormalities in the sinuses that may be causing symptoms, such as a deviated septum or nasal polyps
- evaluate sinuses that have thickened sinus membranes or are filled with fluid
- prepare for surgery by defining the precise structure of your sinuses and nasal cavity.
What Will I Experience During the Study?
A CT of the sinuses is a quick, straightforward imaging exam designed to capture detailed images of the sinus cavities, nasal passages, and surrounding facial structures. When you arrive for your appointment, a technologist will guide you to the CT scanning room and explain each step of the process so you know exactly what to expect.
You will be asked to lie comfortably on a padded scanning table, usually on your back, with your head positioned in a specialized support designed to keep it steady during imaging. Because sinus imaging requires precise detail, remaining still during the scan is important to ensure the clearest possible images. In most cases, you will be able to breathe normally throughout the exam and will not need to hold your breath.
As the scan begins, the table will move slowly through the CT scanner, which is shaped like a large, open ring. The machine does not enclose your entire body, and many patients find it far more comfortable than traditional enclosed imaging systems. You may hear soft whirring or clicking sounds as the scanner rotates around your head. These sounds are normal and simply indicate that the system is capturing high-resolution images of your sinus anatomy.
A CT of the sinuses is typically very fast, often taking only a few minutes to complete once positioning is finalized. In some cases, your physician may request the use of contrast material to enhance visualization of certain structures, such as blood vessels, inflammation, or possible masses. If contrast is needed, it will be administered through a small IV placed in your arm or hand. You may notice a brief warm sensation or a metallic taste in your mouth, both of which are temporary and generally resolve quickly.
Throughout the exam, the technologist will monitor you from a nearby control area and will be able to communicate with you at all times. Most patients find a CT of the sinuses to be comfortable and easy to tolerate. Once the scan is complete, you can typically return to your normal daily activities immediately unless you were given specific post-exam instructions.
