Tony, I used to be involved in developing PET scans. It is the best technology available for detecting small cancers. Basically they inject you with a small amount of a radioactive sugar. As many cancers use glucose a source of energy the radioactivity acccumulates more in the cancer than normal tissue-hence you can see it with the scanner. The radioactivity is very short lived-110 minutes and so has decayed away in a few hours and does not cause any harm. Although the technique has only been available routinely in the UK for the last 4-5 years it has been around for 20 years and many million patients have been successfully diagnosed with it. -sounds like you are in good hands good luck and get well soon your website is invaluable and the best there is