Intensity modulated radiation therapy imrt is an advanced mode of high precision radiotherapy that uses computer controlled linear accelerators to deliver precise radiation doses to a malignant tumor or specific areas within the tumor. Intensity modulated radiation therapy imrt is an advanced form of 3d crt that uses non uniform radiation beam intensities to increase the delivery of radiation to the planned treatment volume while minimizing irradiation of normal tissue outside the target. Intensity modulated radiation therapy imrt for head and neck tumors refers to a new approach that aims at increasing the radiation dose gradient between the target tissues and the surrounding normal tissues at risk thus offering the prospect of increasing the locoregional control probability while decreasing the complication rate. Tion intensities have ushered in the era of intensity modulated radiation therapy imrt representing the state of the art in the treatment of many head and neck cancers blanco and chao 2002. It can be the main treatment for head and neck cancer or it can be used after surgery to destroy small areas of cancer that cannot be removed surgically the most common type of radiation therapy is called external beam radiation therapy which is radiation given from a machine outside the body
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