Figure 2
(a) Example of fluence, for a Head and Neck case, for the three smoothing conditions. The white overlays show the target volumes and the main organs at risk. (b) The three components Zx(dotted lines), Zy(dashed lines) and Zxy(solid lines) of the total spectrum for the two extreme conditions s25 (red) and s80 (green). (c) Mean spectra, averaged over the 17 fluence maps for the three smoothing conditions. It is shown also the ratio between the spectra for s50 (s80) and s25 respectively. (d) Mean modulation index MI.