الفهرس 
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Abstract
Background: Broadly, image-guided radiation therapy (IGRT) may be defined as a radiation therapy procedure that uses image guidance at various stages of its process: patient data acquisition, treatment planning, treatment simulation, patient setup, and target localization before and during treatment. In other words, IGRT signifies radiotherapy that uses image guidance procedures for target localization before and during treatment. These procedures use imaging technology to identify and correct problems arising from inter- and intra fractional variations in patient setup and anatomy, including shapes and volumes of treatment target, organs at risk, and surrounding normal tissues. Aim of Work: The essay aims to uncover the new advances in the techniques of image guided radiotherapy, the merits of these new technologies and the difficulties for their application. Furthermore, we desire to weight the benefit from applying these techniques to the cost of their adoption and to assess the superiority of these techniques to the currently applied techniques. Conclusion: IGRT is a complex treatment modality that has become necessary in many clinical situations to allow for high radiation dose delivered to the target with minimal dose delivered to the normal tissues. The cost of this technique can be effectively reduced and the clinical outcomes overcome the costs. Strict guidelines should be followed and sufficient training of the radiation oncology team should be received before applying IGRT.