Often referred to as SRT, this therapy delivers small individual doses of radiation over multiple treatment sessions, so that the total accumulated dose is larger. It’s a precise and accurate delivery system. The overall total dose is higher than with a Stereotactic Radiosurgery treatment.
Each SRT treatment is called a "fraction" and is sometimes called "fractionated" therapy. SRT combines the precision of Radiosurgery with fractionated radiation improving the delivery over standard radiation therapy.
A dose of radiation damages cells, specifically the cell’s DNA. Normal cells can repair this damage while tumor cells are less able to. While a tumor is precisely targeted with SRT, some healthy tissue receives a small amount of radiation, is damaged, and will begin to repair itself. Each treatment damages the abnormal tissue even more. The healthy tissue recovers, the diseased tissue does not.