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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.
What is CT Lung Screening? CT lung screening is a noninvasive, painless procedure that uses low-dose x-rays to screen the lungs for cancer in just 30 seconds. A CT lung screening allows the radiologist to look at different levels, or slices, of the lungs using a rotating X-ray beam. It is performed on a multislice spiral computed tomography (CT) scanner and can detect smaller nodules or cancer than standard chest X-rays.