Hi,
As far as I know, with IMRT I had scans once a week to make sure everything was lined up correctly. So yes, IMRT in itself is precise.
Your treatment plan devised by your RO is of utmost importance, both in terms of cure and quality of life afterwards. (thanks for the input on tomo)

Couple of other things I could have added earlier. For cancer of the oral tongue, surgery plus radiation & perhaps chemo give you the best chance of being cured, shown by studies. And, regarding extra capsular extension: the gross ECE can be detected when you remove the diseased lymph nodes. But for microscopic ECE, like mine was, it has to be found in an painstaking layer by layer disection of those lymph nodes, and you won't hear about it immediately. It was a surprise awaiting me when I returned for treatment a month afterwards, although I do not think it took the entire month to find it. (I had some holidays intervene with some of my diagnosis)

Best,
Anne
Should have added also that I had quite a bit of saliva until the last few days of treatment and afterwards, which is why I could also eat solids. Now it is quite a bit less, but I do believe it will return.