Linda:
I'm nearly 5 years out - ended treatment in November 2007. For the first year, I had scans every 3-4 months. Second year, about every 5 months. Third year he put me at an annual scan.
In that first year he leapfrogged MRI's and PET scans. If a PET scan was a bit suspect he would immediately follow up with an MRI.
As far as scopes, my ENT has kept it to a 5 months apart schedule. That ended up being the most important since he picked up some osteoradionecrosis at the site of the tumor. We're dealing with that now with hyperbaric oxygen treatments.
Reading some of the posts here, it seems that there wasn't any specific time frame for scans although the first one after treatment was about 3 months out. Beyond that, it was up to the oncologist.
I would think the physician's own experience is brought to bear along with generally accepted research of disease recurrence for that particular type of cancer, its location, and it's progression when discovered. I've no doubt the general state of health of the patient is also important.
So the schedule you're on sounds consistent. Others here may disagree since they want to be exposed to as little followup radiation as possible. I'm far too curious to forgo a scan myself.
Sounds like you're doing great - wishing you many years of continued health!
- Jeff