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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.
PET scans for lungs are one of the most effective imaging tools in diagnosing lung cancer. As lung cancer has very little symptoms in its early stages, it is usually detected through an anatomical imaging procedure such as chest x-rays or a computerized tomography scan that was performed for another medical reason.