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Patient immobilized in Encompass QFix SRS Immobilization system (cyan and magenta) with “virtual goggles” structure (light green) to avoid irradiation of orbits. Arc geometry shown with 2 180° coplanar arcs and 2 arcs with couch rotation of 45 and 315°. (A color version of this figure is available at https://doi.org/10.1016/j.adro.2021.100663.)
