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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.
To diagnose or detect lung nodules, and to try to find their causes, doctors perform PET scans, CT-guided needle biopsies and bronchoscopy. The Seattle Cancer Care Alliance suggests using CT scans to follow pulmonary nodules because many of them are less than one centimeter in diameter and can be early signs of lung cancer.