Figure 1.

(a) 2D and (b) 3D gamma maps of the same transverse slice of the gamma comparison in patient anatomy showing gamma failure (i.e., γ > 1) in the 2D map (average γ = 1.04) but passing in the 3D map (average γ = 0.52) for the 3%/3-mm acceptance criteria with a 15% low-dose threshold.