What is low-dose CT lung screening done with?

You lie on a narrow table that moves through the scanner’s short, open centre. X-ray equipment rotates around your chest and a computer builds cross-sectional images of the lungs. The low-dose protocol is selected for screening rather than for every diagnostic question. You may be asked to hold your breath briefly so the images are less blurred. The scan does not require an incision.

A screening scan is designed to look for lung findings in people who meet the clinical criteria for screening; it is not a general check for every cause of chest symptoms. A finding may need comparison with earlier images, another scan, or a specialist review. Learn about the [CT Scanner](/technology/ct-scanner/).

Follow the imaging centre’s instructions about clothing, metal objects, and arrival time. Tell the radiographer if you may be pregnant, have difficulty lying flat, or feel anxious in enclosed spaces. Screening usually uses no injected contrast, but confirm this when booking. Bring previous chest imaging if the centre requests it, because comparison can help interpretation. Continue prescribed medicines unless your clinician tells you otherwise.

Screening is not a substitute for prompt assessment of new or worsening symptoms. Contact a clinician about coughing blood, persistent or worsening breathlessness, chest pain, unexplained weight change, or a cough that does not settle. Seek urgent help for severe breathing difficulty, blue lips, sudden confusion, or crushing chest pain.

Ask why screening is being recommended, what the scan can and cannot show, how prior images will be compared, and how you will receive the report. Ask what the next step would be if a nodule or another finding appears.