Here, the dose has been mapped onto all structure surfaces. Note the beam footprints exiting the lungs, and the expected high dose at the tumor surface. This is a much simpler calculation than dose surfaces, since a calculation only occurs at each structure vertex, not at each dose point. There are only 13K vertices versus 300K dose points. The point is, one is more likely to use the original dose volume for this type of operation. If dose surfaces and dose mappings are calculated from different dose volumes, we might be able to see discrepencies by comparing the two. |