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The expanded margin to maintain the desired geometrical coverage. The overlapping percentage of PTV that expanded from CTV_Lr in pCT with 0, 1, and 2 mm and the CTV_Lr volume in rCT. For the overlapping percentage, the lower limits of 95% confidence interval higher than 95% were defined as acceptable geometrical coverage. PTV, planning target volume; CTV_Lr, low-risk clinical target volume; pCT, planning CT; rCT, repeat CT.
