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Comparison of 4D dose accumulation using all 10 phases (full 4D), AVG-CT, mean position phase, and end of inhale phase for the SBRT plan of Patient 3. The mean position phase was defined as the phase in which the tumor centroid was closest to the average centroid position over all 10 phases. The AVG-CT approach yielded closer approximations to the full 4D dose accumulation.
