Upon your arrival at the center, you must present yourself to the secretariat. They will inform you of the exact time of your treatment and the linear accelerator your treatment session will be performed with (the center’s corridors are marked with colors - each linear accelerator corresponds to a different color). Then, you will be taken to the treatment room where you will receive your daily treatment (linear accelerator room).You may be asked to wear a hospital gown before you enter the treatment room.In the room, the technician, using personalized immobilizing systems and taking into account the marks on your skin, will place you in the correct treatment position. Session times vary from 10-20 minutes. Most of the time is spent on your correct positioning. The beam delivers radiation for 1-2 minutes.During treatment, you should remain still so as to avoid accidental delivery of radiation to non-target areas. You do not have to hold your breath; breathe normally and do not feel tense. Following your placement in the right position, the technician and the rest of the staff will leave the room.The technician of the machine watches you from a closed-circuit television with two-way audio communication, and he can interrupt the delivery of radiation at any time, in case you do not feel well.During some of your sessions you will undergo radiographic screening to ensure your correct position -images (X-ray or CT-scanning) are obtained when in the machine, prior to treatment.