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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 and MRI scans are anatomic imaging modalities, which means that they look at the size and shape of organs and body structures. A PET scan is a metabolic imaging modality, which means it looks at cellular activity. The information collected from a PET scan is different from any other test that is available.