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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.
The type of low-dose CT scan that is recommended for lung cancer screening is a newer form of CT scan known as a low-dose spiral or helical CT scan. The low-dose spiral CT scan continuously rotates in a spiral motion and takes several 3-dimensional X-rays of the lungs. These X-rays are very detailed and can show early-stage lung cancers that may be too small to be detected by a traditional X-ray. Traditional X-rays can identify lung cancers the size of a dime, whereas low-dose spiral CT ...