It is the radiation physicists and dosimetrists who translate the physician's prescription so that proper fields and doses of radiation are administered. The radiation physicists, along with engineers, maintain the equipment in tip-top condition. There are routine and daily quality assurance checks performed. They work under the direction and guidance of the physician. Their training often includes extensive college education as well as two mandatory years of training in radiation by New York State law leading to licensure and registration.
Vigorous examination is required prior to radiation therapists receiving their registry.
The different energies of photon and electron beams are used differently in each patient depending on the area being treated and the size and girth of the patient. Different size radiation fields create different beam characteristics which must be taken into account prior to therapy. That is true. We have specific computer planning systems for radiosurgery, brachytherapy and external-beam radiation therapy. The beam comes from outside the patient to attack the target.