Today the radiation people did a simulation run. As far as I understand this is how it worked. I had the mask on and they had the CT scan in some form in the simulation machine. This machine sent a light (laser perhaps) beam out where on a real radiation machine the radiation particle beam would come. Using the position of the tumour from the CT scan they were able make sure that the beam would precisely aim at the tumour and as little as possible anywhere else.
This is how I think it happened but I didn't ask enough (difficult with the mask on) and my medical and technical German didn't help too much. It didn't seem that important to know all the details.
It seemed a funny combination of really high tech (CT data, lasers) and low tech (a red magic marker was used to mark on the mask where the beam should be focused).
It does show how incredibly technical so much medical treatment is these days.
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