Hi, I have a question about having a cat scan. I had a cat scan about three years ago. I have emphysema and asthma. My pulmunologist want me to take another cat scan to detect if there is any lung cancer. He said it is recommended. I don't have any symptoms, but he said it's a precautionary measure. I really don't like the idea of taking a scan,and exposing my body to radiation . I'm just wondering if I'm over reacting, and how other people with this disease feel about this. Would you get the scan, or not. Thank you in advance for your replies.