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Stereotactic Radiosurgery


Stereotactic Radiotherapy (SRS)

Stereotactic Radiosurgery is a technique that is used in the treatment of certain types of tumors. SRS is used when a high degree of precision is required. This additional precision is attained through rigid immobilization of the body part to be treated, such as with a head frame that is used in the treatment of brain tumors.

Although usually performed in a single treatment, fractionated radiotherapy (SRT) (delivery of up to five treatments), is sometimes used. In addition to treating tumors, this method is sometimes used to treat malformations in the brain's blood vessels and certain non-cancerous (benign) brain tumors.

The treatment involves the delivery of a single high-dose—or sometimes smaller, multiple doses—of radiation beams that converge on the specific area of the brain where the tumor or other abnormality resides. Using a helmet-like device that keeps the head completely still and three-dimensional computer-aided planning software, stereotactic radiosurgery minimizes the amount of radiation to healthy brain tissue.

Treatment delivery can be done on a Gamma Knife, CyberKnife, or conventional linear accelerator with specialized hardware.

Particle beam (proton) or cyclotron is in limited use in North America. However, several new facilities are being built.

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