Fig. 3

The choice of direction for pointwise distances from the dCT (red contour) to pCT (blue) CTVin contours. The cut images on the right demonstrate negative (a) and positive (b) distances from dCT CTVin to pCT CTVin. Thus, the positive HD95 value indicates the need for an additional margin, while the negative would indicate variations inside the original CTVin. The body contour of the pCT is depicted in dark green. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)