Second scan

I am about to have my second scan to see if any tissue is left. I had my thyriod taken out in Nov 2007. I just want to know if any one out there had a good or bad scan??? I was told that is any tissue was left I will have to have treatment again. I start that wonderfull diet again next week, for 11 days then go in and get two shots and take the pill and see what we see......