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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.
In this study, researchers are looking at a different type of CT scan called a dynamic CT scan. You have this at the same time as the PET scan. The dynamic CT scan provides different information to a PET scan. The aim of the study is to find which type of scan is better at diagnosing early stage lung cancer.