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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.
Whatâs the difference between an X-ray, CT scan and MRI? Tags: CT scans, MRI, X-rays |. Doctors commonly use diagnostic imaging techniques to narrow down possible causes of pain or illness for a more accurate diagnosis. There are different types of diagnostic imaging, including X-rays, CT scans and MRI. The type of imaging used depends on the part of the body the doctor wants to see on an image, as well as the type of imaging that is readily available to the patient.