Radiation Oncology

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Stereotactic Radiosurgery

Introduction: Stereotactic Radiosurgery is a technique that delivers a precise dose of high-energy radiation with pinpoint accuracy to a targeted region within the brain. Through the use of specialized equipment and state-of-the art computer aided planning, treatment is delivered with minimal dose to surrounding healthy brain tissue.   Stereotactic radiosurgery (SRS) is used to treat both benign and malignant tumors of the brain.  Stereotactic radiosurgery may be used to treat brain lesions that are not surgically accessible, as an alternative to conventional surgery or as a boost after conventional surgical resection.  The role of stereotactic radiosurgery has been evolving in recent years and therefore the appropriate use of this technology must be carefully discussed with your doctors.

Unlike traditional surgical operations stereotactic radiosurgery does not remove the tumor. By delivering a high dose of radiation it damages the DNA of the lesion thereby causing its destruction.  SRS is non-invasive and does not use a scalpel, but rather the invisible blade of radiation.  This makes the  procedure bloodless while reducing the discomfort and complications of invasive surgery.

The treatment process involves the placement of a metal ring around the patient's head prior to obtaining a CT scan image. These images are then analyzed by the treatment planning computer which generates the beam arrangements used to treat the disease and avoid any critical structures in the brain.  The stereotactic instruments on the linear accelerator (treatment machine) immobilize the patient and guide the beam precisely to the lesion volume, as the patient lies comfortably on the treatment couch.