Robin had conventional (radiotherapy) not IMRT and for the first 5 weeks he had both sides of his neck/mouth targeted,and th floor of his mouth/throat.At the end of week five he was recalibrated,had anothe simulator session and a new mask as he had lost so much weight,and then started a round of punishing booster sessions which were accompanied by some sort of electrodes attached as well.Theses sessions lasted for much longer (15 mins instead of 6 mins),and they absolutely floored him,which wasn't that hard as the first 20 sesions pretty well burned him to a crisp and fried the inside of his mouth as well.
My understanding was that they pinpointed the actual tumour sites and concentrated the treatment for a short while,rather than just zapping the whole area.
it was tough but like everything else sweetie you will get through it
love liz