A sinus CT scan is a type of CT scan technique that makes use of low-dose X-rays to examine the sinus cavity for inflammation and sinusitis.

Sinuses are the air-filled spaces just at the top of your nose, which typically flares up either because of an allergy or infection. 

The sinus CT scan helps determine the presence and extent of chronic or recurring sinusitis by giving accurate and detailed images of the area, 

This image diagnostics test is recommended mostly after a physical examination and/or after an inconclusive X-ray. The sinus CT scan is a quick and non-invasive image testing technique that takes about just 10 minutes to complete. 

In rare cases where the sinus CT scan needs to check hard to scan regions nose and the ears, a contrast dye can be administered for clearer images. 

The contrast material has nearly no side effects and gets flushed out via urine within 24 hours.