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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 lung PET scan is also used to stage lung cancer. Fast-growing tissues, such as lung cancer tumors, absorb more of the tracer substance than other tissues. These areas stand out on the PET scan. Your doctor can use the three-dimensional images to detect growing tumors. Cancer is assigned a stage between 1 and 4. Staging refers to how advanced a particular cancer is.