Your physician, a radiation oncologist, has completed a fellowship – several years of special training – in the treatment of cancer by radiation. He or she uses various diagnostic scans and imaging studies to determine exactly where the cancer is and creates a prescription – a treatment plan specifically for your cancer. A physicist and a dosimetrist assist the radiation oncologist in assessing exact treatment fields and doses to be delivered during your treatment. The radiation therapists deliver the radiation therapy. Nurses, dieticians and other specialized therapists will also contribute to your care.