A type of intensity-modulated radiation therapy (IMRT), tomotherapy delivers external radiation as a single beam divided into laser-thin "beamlets." Tomotherapy is generally used to treat prostate cancer patients whose tumors are hard to reach, or attached or close to healthy tissues and organs. Patients undergoing tomotherapy radiation will receive treatment in daily sessions, Monday through Friday, for five to nine weeks. Each session lasts about 20 minutes.
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