Figure 8: The dose difference volume map of 50 patients plans over 2500 channels. (A) Two tail sub-regions of the OARy profile, one from 10% to 5% of the amplitude, the other with less than 5% of the amplitude. (B) The absolute dose differences from 50 patients are summed and multiplied by 100 to give the volume in each channel along the α - β plane. The volume itself represents the third dimension in the plot.