A few people here had tomotherapy or helical tomotherapy, which is a form of CT guided IMRT in one machine that is delivered slice by slice instead of opposing fields, and reduces radiation exposure to normal tissue, and before each treatment, a 3D image is taken, so the tumor can be targeted accurately, adjust any changes, but I don't hear about it as much anymore with head and neck cancer, maybe more with other movable cancers like lungs, but there are discussions about tomotherapy, if you look under search. Hopefully someone with experience can help, but as mentioned, it's IMRT.
As far as cancer centers, you can check NCCN, and NCI associated member listings, and or U.S. News Report Best Hospitals for Cancer and ENT.
http://www.nccn.org/members/network.aspxhttp://www.cancer.gov/research/nci-role/cancer-centershttp://health.usnews.com/best-hospitals/rankingsGood luck.
