It's probably not the same, and was most likely IMRT your father received. MD Anderson has Proton Therapy. There are 11 locations in the U.S. They may or may not be able to do it, the same with any other type radiation treatment.
Here are the different locations, and ones under developmen. It's interesting to note only 6,000 patients a year can be treated with Proton Therapy.
http://www.proton-therapy.org/map.htm