The machine you are treated with is called a Linear Accelerator. The purpose of radiation therapy is to make tumors shrink or disappear. Radiation does this by damaging the structure of the cells so they can not grow or divide. There is no pain or discomfort during radiation treatment. Radiation therapy is much like having a chest x-ray or a scan except the machine is left on for several minutes instead of a second or two. Most treatments only last about 15 minutes.

