Improving the accuracy and consistency of clinical target volume delineation for rectal cancer by an education program

Figure 1 Example images showing the differences in clinical target volume delineation variation before and after the education program. A: Junction slice of rectum and sigmoid colon (before the education program); B: Slice of the ischiorectal fossa (before the education program); C: Sagittal view (before the education program); D: Junction slice of rectum and sigmoid colon (after the education program); E: Slice of the ischiorectal fossa (after the education program); F: Sagittal view (after the education program). Target volumes delineated by different participants are displayed in different colors.