What kind of radiation is used in IGRT?
Currently, photons (X-rays) are used to deliver IGRT. The radiation is generated by a machine called a medical linear accelerator. This machine stands approximately nine feet tall, is nearly 15 feet long and can be rotated around the patient with great precision. Operationally, microwave energy, similar to that used in satellite television transmission, is used to accelerate electrons to early the speed of light. As they reach maximum speed they collide with a tungsten target which, in turn, releases photons, or X-rays.
