The patient is evaluated preoperatively by an internist and anesthesiologist.
Insertion of plastic catheter 
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While the patient is under general anesthesia, four parallel equidistant guide-needles are inserted centrally in the area at risk in the created rectangle.
The guide-needles are then replaced by plastic catheters for after loading. The closed ends of the plastic catheters are inserted close to the surface of the tongue. Under the chin, plastic tubes are attached with "snaps".
CT is taken with 1 mm thick slices. The target volume is drawn which is mostly in the volume within the limits of the catheters.
A physicist will then prepare the dosage plan 
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