Even in this time of uncertainty, Mayo Clinic is a place for hope and healing — and we're committed to delivering the care you need. With options for face-to-face, virtual visits or phone appointments in adherence with federal and state executive orders and guidance. Ranked the best hospital overall by U.S. News & World Report, Mayo Clinic's state-of-the-art Proton Beam Therapy Program in Rochester, Minnesota delivers the best possible, precise radiotherapy with lower doses of radiation to healthy tissue. This highly targeted therapy is ideal for people with tumors close to or in vital organs and for children, whose organs are still developing. The Mayo Clinic Proton Beam Therapy Program uses the latest form of proton beam therapy — pencil beam scanning. Mayo Clinic offers proton beam therapy at its Arizona and Minnesota campuses.