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The tumor depth is varied as the gantry rotates. This figure illustrates how the average depth of the tumor is extracted in the present work of MU calculation. The radial lines are drawn diverging from the tumor center. All the radial lines are in equal angular (10°) intervals. Each radial quantifies a depth from the tumor center to the skin. The average depth is obtained by summing up all the radial line depths and divided by the total number of radial line depths.
