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The experimental setup at the linac. An encoder was connected to the center of rotation of the gantry with a plastic rod. The encoder mount allowed for precise lateral and longitudinal adjustments. Target crosshairs machined into the sides and top of our radiographic gantry‐angle phantom allowed positioning at isocenter via room lasers. A spirit level attached to the phantom base, along with adjustable screws located on each of the four support legs, enabled levelling.
