The bad news that their child has a deadly brain tumor. Dr. McLaughlin says the brain is the only site eligible for this treatment. That's because it's hard to prevent other parts of the body from moving. The technology administers radiation measured by the millimeter, and if a patient moves, the radiation may miss the target. Researchers are looking for ways to apply it to other parts of the body.
Standard radiation remains an excellent option for many other types of cancer.
It is not as safe for brain tumors because the field of radiation is too wide, hitting normal tissues. Mayo Foundation for Medical Education and Research.