Image-guided radiation therapy (IGRT) has been used since the inception of radiation therapy, but its usage became routine with the development of gantry-mounted cone-beam CT systems in the early 21st century. IGRT is now the norm in the clinics equipped with modern radiation therapy delivery systems, as it enables more accurate delivery of radiation to intended targets. This book was produced as part of the 2018 AAPM summer school. It covers all the important aspects of current IGRT techniques used in clinics, as well as some emerging technologies that may become available in the future. Â
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