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WL‐based BB phantom images with IsoCal correction off and on. From the top row to the bottom row, the source angles are 0°, 90°, 180°, and 270°. The red crosshairs represent the digital graticules in the MV/kV images. The green crosshairs represent the treatment isocenter. Note: the BB for our in‐house WL test, shown in these images, is at a fixed location, not necessarily at the treatment isocenter.
