The Wall Street Journal published article:
articlehttp://online.wsj.com/article/SB10001424052702304791704577418173565087592.html
explains that there is now a way with a radioactive dye (Amyvid) to detect brain plaque changes more visible on PET scans. Bigger plaque and tangle changes can be associated with Alzheimer's disease. This test can either be a curse or a benefit for the families to plan accordingly - depending upon the family feelings. Please read the article!
Thank you for reading!