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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.
At Johns Hopkins, the brain tumor team will perform a variety of examinations to diagnosis a brain tumor. Magnetic resonance imaging (MRI) and computed tomography (CT or CAT scan) are the most common types of tests used to diagnose brain tumors. Both MRI and CT scans use computers to create detailed images of the brain.