The integration of on-board imaging (OBI) with linear accelerators paved the way for Image Guided Radiation Therapy (IGRT) as it is practiced today in the clinic. The advent of IGRT is a major milestone in the history of radiotherapy. The main goal of image guidance in radiotherapy is to improve radiation treatment delivery via superior localization and tracking of target cancer cells. IGRT is hence integral to accurate, precise and safe delivery of radiotherapy.
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