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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.
Lung Scans and Lung Biopsies. A CT lung scan is an imaging test in which many x-rays are taken from different angles of the chest. These images are combined by a computer to make detailed cross-sectional pictures of the lungs.ung Scans and Lung Biopsies. A CT lung scan is an imaging test in which many x-rays are taken from different angles of the chest. These images are combined by a computer to make detailed cross-sectional pictures of the lungs.