Simulation is very important, since it is the step that allows for proper planning and delivery of the actual treatment. CT scans may have to be taken in order that the computers can calculate and prescribe the dose distribution of the radiation. Blocks and shields are often fashioned for the patient undergoing radiation treatment. Blocks or shields are pieces of lead that are placed on a tray between the patient and the treatment machine. The blocks basically will cover up normal tissues in the body in order that radiation is delivered principally to the tumor.
External radiation is a safe and basically painless form of treatment.
Usually, the treatment course lasts between two and five weeks. Patients are brought by the radiation therapist into the treatment room and positioned onto the treatment table. During the actual treatment, patients are alone in the room but the radiation therapist is outside and can hear patients through a close circuit television. The treatment is painless . Patients do not hear or feel anything during or after the treatment.