Fig. 3.

The contours delineated by the four radiation oncologists (green) and the reference contours (red) in the central image slice of each of the 13 image series in phantom set-up A. For each phantom set-up, image series 13 was also used to create the red reference contours. Only the central part of the phantom is displayed in the figure, but the oncologists were shown the whole images. For the corresponding figure with set-up B, see Fig. B.1 in the supplementary material. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)