The CT scan produces a three-dimensional image of the lung revealing about six times more resolution than an X-ray. Lung cancer screenings can be used to screen smokers (cigarettes, cigars, pipes, marijuana) as well as non-smokers who may have a family history of tuberculosis or pneumonia, or who may have been exposed to secondhand smoke or other cancer-causing agents such as asbestos, radon and agent orange.

Patients should note that lung cancer screening is a relatively new technology and long term studies are still in progress. A nationwide lung cancer screening trial comparing chest X-ray to spiral CT scanning for detection of early lung cancer is ongoing. However, there is encouraging short-term data available that seems to justify the use of CT to screen high-risk smokers for lung cancer. It’s recommended that patients ask their doctors if this type of exam is right for them.