Tizz,
"boosters" usually means that they are giving you "extra" radiation in specific targeted areas. Most folks have about 5000 cGy of radiation, "full boost" ups the ante to 7,000 cGy. If you have a late stage (like I did) they will always give you the full boatload.

Larry,
I did a fairly comprehensive search on Johns Hopkins site and could not find any reference to PBT or therapeutic protons. If you are treated on one of these you would know it. They would probably send you to counseling just to deal with the sheer size of it. This piece of equipment requires it's own unique building.

Proton therapy had been limited to physics centers until now. And like most new technologies, the prototype is a very expensive endeavor. However, more institutions have plans for proton therapy facilities in the near future including Harvard University at Massachusetts General Hospital. There are proton therapy facilities in Canada, Japan, Germany, Russia, South Africa, Switzerland, France and England.

Currently there are only 2 proton treatment centers in the United States.

The world's first hospital-based proton center opened in 1990 at Loma Linda University Medical Center in southern California. Loma Linda has treated more than 8,000 patients with proton beam radiation therapy in the last 12 years, mostly men with prostate cancer.

In 2000, the Northeast Proton Therapy Center at Massachusetts General Hospital opened and is treating cancer patients. MPRI will become the third proton center and will put the nation's midsection on the proton map and in the forefront of advanced medical treatment.

The future for more regional proton centers also looks bright. In the southwest, the highly respected cancer program at M.D. Anderson Cancer Center in Houston will add protons to its treatment mix. As will the University of Pennsylvania Medical Center in Philadelphia, and the University of Florida's Shands Medical Center in Jacksonville.

"After a decade of proving at Loma Linda that proton therapy actually works, its becoming a mainstream cancer treatment option," said Leonard Arzt, executive director of the National Association for Proton Therapy. "The public has become knowledgeable about the benefits of proton therapy. That's why we've seen a demand for more regional proton centers. People want to limit their travel time and stay closer to home."

Source: http://www.proton-therapy.org/pr19.htm