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Stereotactic body radiation therapy (SBRT)

Stereotactic body radiation therapy (SBRT) uses guided imaging to deliver a targeted radiation dose to a tumor located anywhere in the body except the cranium. During SBRT, the radiation focuses on the tumor with millimeter precision. The result may be that less healthy tissue gets damaged by radiation. Preserving healthy tissue is important for cancer patients whose tumors are near or in essential organs.

For certain tumor types and disease sites, markers may be placed to help precisely locate the tumor and guide radiation treatment delivery. This helps facilitate the accuracy and precision of daily treatment.as

During treatment, concentrated, highly focused radiation is delivered. The custom mapping provided by the coordinate system plans the radiation to account for a patient's anatomy, breathing and organ motion.

Throughout the treatment, the intensity and direction of the beams are constantly modulated to target the tumor and help spare healthy tissue. The beams are also adjusted for movement from breathing or organ motion. SBRT may be used to deliver a single high dose of radiation, or several fractionated radiation doses (usually up to five treatments over a period of days).

In contrast to conventional radiation therapy, which delivers smaller doses of radiation each day for several weeks, stereotactic body radiation therapy delivers higher doses in fewer treatments, typically with fewer side effects.