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Requirements for Online Adaptive RT
 Daily volumetric imaging (CBCT, in-room CT, onboard MRI …)
 Fast and robust image segmentation methods
 Fast re-planning
 Work in progress
 MRIdian
 Hybrid methods (e.g. aperture morphing, segment optimization)
 Plan-library based methods
 Use a pre-treatment established motion model to compute
configurations of the target volume and organs at risk
 Simple method: margin-of-the-day
Fast, robust, highly automated, and failsafe