Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
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.
