Fig. 3.

Probability P(γ > x), where x is a certain calculated γ value, that a voxel’s γ value will exceed the γ criteria (1% of dose and 1-mm distance-to-agreement) as a function of the x value, using the dose distribution from the mesh tally dosimetric results as the reference. Probability curves are plotted separately for two cranial fields (beams 1 and 2) and three spinal fields (beams 3, 4, and 5).