The radiologist then views these images in succession on a computer screen. This scan is so sensitive that is possible to detect nodules that are too small to be seen on a routine x-ray. The effective radiation dose is approximately 65 milli-rem, about the same as a mammogram. Screening means trying to diagnose and find a disease while the disease is at an early stage. Screening for lung cancer is not being done routinely at this time.
Most lung cancer is caused by cigarette smoking.
That is why this study is inviting people who smoke or who have smoked regularly within the last 10 years to join. Any person 60 years of age or older who has smoked on a regular basis over many years. An interviewer will ask specific questions about smoking history. People who have had a heart attack or stroke within the past 6 months will not be eligible to participate. However, for anyone who would like to stop smoking, we will offer assistance in the form of information and referral to someone who can help.