In terms of target coverage, as described above, every plan delivered at least 70 Gy to 95% of the PTV_70 volume. Similarly, 95% of PTV_56 volume was always covered by the 56 Gy isodose. The minimum PTV dose was below desired 66.5 Gy (95% of prescription) in the same three cases for both the APs and the HDPs. This does not contradict the previously described analysis by the RTOG 1016 criteria, since the minimum dose here is defined for a single voxel. Finally, there was a difference, albeit not statistically significant, in the minimum dose (single voxel) to PTV_56. Three HDPs and seven APs failed to reach the 53.2 Gy (95% of prescription) goal. However, for one patient the HDP failed and the AP did not.