Site 022 has changed their PET scanner from a Philips Allegro PET-only system, to a Philips Gemini-TF PET/CT.
All subjects scanned under ADNI-GO were scanned on the Allegro system.
All subject scanned under ADNI-2 have been scanned on the Gemini-TF (just 3 scans as of this posting)
Bob Koeppe
11/8/11