Well said Ralph. This is my understanding also. I'm going to see an expert on proton radiation and tomo next week. I'll try to discern info on that option too and bring it back to the group. But like Ralph said--ask your docs too.
Being that Ga does not have tomo--I'm just wondring "why" if it is the going thing. There are some references to helical tomo with on board scans---wonder if TomoHi-Art is just a brand name for equipment that may be around---like "kleenex" for "tissue paper"
DeniseB