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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.
A PET scan is a unique type of imaging test that reveals physiologic processes in organs such as the lung. The PET scans were examined by 12 raters, 10 neurologists, and two psychiatrists, none of whom were informed of any details of the patients' cases.