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Intensity Modulated Radiation Therapy, or IMRT, is one of the most advanced treatment methods available in external beam radiation therapy. Initially, a CT scan is performed on the affected region in order to establish the exact contours of the tumor and the surrounding healthy tissue and therefore determine the dose of radiation.

Based on this data, the radiation beam is modulated to different levels of intensity by a computer-controlled multi-leaf collimator. The "leaves" of this device ... more