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Linear regression between the MU ratio (XVMC/BPL) under D95 prescription and the distance from chest wall to the PTV margin (Pearson's correlation coefficient r = 0.5735, n = 20, P = 0.0082).
Negative values of the distance mean overlapped distances between the PTV margin and the chest wall. BPL = the Batho power-law correction, RPL = the radiological path length algorithm, XVMC = the X-ray Voxel Monte Carlo algorithm, MU = monitor units.
