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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.
Recent studies show that CT lung screening is more sensitive than standard lung screening methods (ie, chest X-ray, sputum cytology) in detecting lung cancer. Unlike standard chest X-rays, CT lung screening takes cross-sectional images of the lungs. This allows the radiologist to see the lungs from top to bottom.