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Once the location of the treatment area has been established, the skin surrounding the area is marked with small tattoos about the size of the head of a pin. This ensures that the exact same area is treated during each visit. Simulation not only permits precise localization, it also helps to determine whether treatment shields are needed to protect surrounding organs or tissues. Treatment shields are unique to each patient and are made using the simulator films or CT scans as a guide. Additionally, depending on the area that is being treated, the therapists may use a customized casting to help you maintain a particular position with comfort during simulation and treatment.
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Prior to your first treatment, x-rays or CT scans will be taken of the area. This is done with a special unit called a simulator. A simulator is a treatment planning machine which enables our radiation oncologists to determine the precise location of your treatment field. It does not deliver the actual treatment.
Once simulation is complete, computer calculations are used to determine the best method of delivering the prescribed amount of radiation. Since radiation affects all cells, normal and abnormal, treatments are calculated to attack the area of involvement while sparing as much normal tissue as possible.