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From Wikipedia, the free encyclopedia. A ventilation/perfusion lung scan, also called a V/Q lung scan, is a type of medical imaging using scintigraphy and medical isotopes to evaluate the circulation of air and blood within a patient's lungs, in order to determine the ventilation/perfusion ratio.he ventilation and perfusion phases of a V/Q lung scan are performed together and may include a chest x-ray for comparison or to look for other causes of lung disease. A defect in the perfusion images requires a mismatched ventilation defect to indicate pulmonary embolism.
Typically, the V/Q scan is done to test for the presence of blood clots or other abnormalities in ventilation and circulation in the lung area. It is also commonly used in the presentation of chronic obstructive pulmonary disease (COPD) or pneumonia.ith the perfusion scan, the table is movable and is placed directly beneath the scanner. The scanner will take snapshots of the way blood flows through your lungs and find the radioactive particles. The ventilation scan tends to be described as the scarier of the two scans. This is for two reasons.