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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.
Also known as Chest CT, X Ray Computed Tomography (x ray CT), computed axial tomography scan (CAT scan) A chest CT scan is a more detailed type of chest x ray that takes many detailed pictures of your lungs and the inside of your chest.