Purpose: To detect lung cancer and other abnormalities in the lungs

For Whom Appropriate:

* Smokers (cigarettes, cigars, pipes, marijuana)

* Non-smokers with any of the following risk factors:

* Exposure to secondhand smoke

* Exposure to cancer-causing agents such as asbestos, radon and Agent Orange

* History of tuberculosis or pneumonia

Significance:

* Lung cancer kills more American men and women than any other type of cancer.

* Lung cancer tumors are typically the size of an orange by the time they're discovered in a chest x-ray. CT scans can detect tumors as small as a grain of rice.

* The five-year survival rate for lung cancer is only 14%. However, it's estimated this could be increased to 80% through early detection and treatment.