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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.
Doctors use chest CT scans to: 1  Show the size, shape, and position of your lungs and other structures in your chest. 2  Follow up on abnormal findings from standard chest x rays. 3  Find the cause of lung symptoms, such as shortness of breath or chest pain. chest CT scan is a type of x ray. However, a CT scan's pictures show more detail than pictures from a standard chest x ray. Like other x-ray tests, chest CT scans use a form of energy called ionizing radiation. This energy helps create pictures of the inside of your chest.