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Longitudinal real time delta increases as the distance between the centroid of the region‐of‐interest (ROI) and isocenter increases at non‐zero couch angles prior to advanced camera optimization (ACO). This dependence is eliminated after ACO. (Before ACO: slope = 0.077 mm/cm, intercept = −0.04 mm (R 2 = 0.173); After ACO: slope = −0.006 mm/cm, intercept = −0.52 mm, R 2 = 0.001).
