Set-Up
Several days after the simulation and after all calculations have been performed, your treatment can begin.
The treatment machines (linear accelerators) resemble the simulator, but are larger. You will be placed on the treatment table in the same position as you were on the simulator. Proper positioning usually takes 10 to 15 minutes. Once in place on the treatment table, a set of X-ray films will be taken. These films will be matched with the simulation films to ensure that the treatment is going to be delivered the same way as it was simulated. Occasionally, the match is not optimal. In these cases, adjustments will be made and will be checked by your attending physician. In rare cases, more adjustments are required and treatment may need to be postponed. Once the films and positioning are confirmed, a treatment will be delivered. While it seems like a lot of time to plan and set up, it is critical that the treatment be given as it was planned to avoid unnecessary toxicity to healthy tissue and to get the correct amount of radiation to the treatment area.
The actual administration of the radiation treatment typically takes about 5 to 10 minutes. Factors that affect the total length of the treatment include the complexity of your treatment, the particular machine on which you are being treated and how quickly you can be positioned properly for treatment.
Confirmation
Often, your attending physician will be called to see you at the machine to make sure that your position is correct. This should not cause you any concern, as it is a standard part of practice to ensure the most accurate delivery of the radiation treatments.