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. 2016 Nov 11;43(12):6491–6496. doi: 10.1118/1.4967344

FIG. 2.

FIG. 2.

Sample global error. These plots of (a) a right–left profile taken from an axial film and (b) a superior–inferior profile taken from a sagittal film are from an institution trial deemed to exhibit global nonsystematic errors in treatment planning and delivery. This plan has poor dose uniformity through both the primary PTV and the secondary PTV. No additional error patterns (rotation, shifting, etc.) were evidenced in this irradiation. PTV = planning target volume.