Intensity modulated radiotherapy (IMRT) uses advanced computer technology to deliver very precise radiation beams that target and destroy the cancerous cells while avoiding the surrounding healthy tissue. With the help of three–dimensional computed tomography (CT) and a computer–controlled delivery system, multiple radiation beams of varying intensity are directed at the tumor from different angles. This reduces the risk of exposure for the healthy tissues that might come in the way of the beam as the intensity and angle of each beam can be adjusted with the help of the computerized delivery system. IMRT is widely used for treatment of cancerous tumors of the head, neck, prostate, lung, GI tract, thyroid, and breast.
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