Oscar
I though you were still having IMRT? From what I understand is that you generally have to wait until at least 4-6 weeks after RT before you can have a PET scan. If they do it earlier you pretty much expect false positives because of inflammation/healing. With CT they should be able to see the size of the nodes (and see if there others are involved).
One of my nodes was slightly enlarged (CT) but did not show any elevated uptake in the PET/CT scan in September. (End of RT July 19th).
Best, hopefully you get more responses here.

Markus



Partial glossectomy (25%) anterior tongue. 4/6/07/. IMRT start @5/24/07 (3x) Erbitux start/end@ 5/24/07. IMRT wider field (30x) start 6/5/07. Weekly cisplatin (2x30mg/m2), then weekly carbo- (5x180mg/m2). End of Tx 19 July 07.