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Two types of lung scans are usually done together: 1  Ventilation scan. During this scan, you inhale a radioactive tracer gas or mist. 2  Perfusion scan. During this scan, a radioactive tracer is injected into a vein in your arm.
CT scan for lung cancer. A CT scan reveals the anatomy of the lungs and surrounding tissues, which our cancer doctors use to diagnose and monitor tumor growth. If neurological symptoms are present, a CT scan of the brain may be performed to check for metastases.