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Real‐time Position Manager (RPM: Varian Medical Systems, Palo Alto, CA) respiratory gating console. The upper window shows a real‐time camera image of the two RPM markers, caught in time during their up–down cycle. The lower window plots the vertical rise and fall of the marker position versus time and the duty cycle indicating when the delivery is turned on and off. Here, the pulses are turned on when the markers are lowest, representing the phase centered on maximum exhalation.
