systemMevionProton Therapy

Mevion S250 (family)

Modality: Proton Therapy

Mevion's compact single-room proton-therapy system — established the U.S. community-hospital proton-therapy category alongside IBA Proteus ONE. Architecturally distinct: superconducting synchrocyclotron mounted directly on the gantry, eliminating the separate cyclotron vault and beam-transport infrastructure of multi-room proton centers.

Variants

  • S250 — original 2013-era platform; first clinical install at Barnes-Jewish Hospital (St. Louis).
  • S250i — refresh generation.
  • S250-FIT — current, with HYPERSCAN pencil-beam scanning.

Distinctive technology

  • Gantry-mounted superconducting synchrocyclotron — compact accelerator integrated with the rotating gantry; the architectural innovation that made single-room community-hospital proton therapy economically viable.
  • HYPERSCAN pencil-beam scanning (S250-FIT) — modulated-spot delivery with rapid energy switching; the modern PBS standard delivered on the compact platform.
  • Adaptive Aperture — collimating element on selected configurations.
  • Single-room footprint — building / shielding requirements substantially smaller than multi-room proton centers.

Clinical use

  • Pediatric oncology — dose-sparing for CNS tumors, sarcomas, retinoblastoma, leukemia / lymphoma adjuvant.
  • Base-of-skull and CNS — chordoma, chondrosarcoma, optic pathway tumors.
  • Selected adult indications — base-of-skull, re-irradiation, eye / orbit, pediatric and AYA cancers.

Refurb posture

  • No meaningful refurb market — installed base small and per-vendor; lifecycle decisions are program-level events.
  • Service-contract continuity dominates operating economics.
  • Pre-HYPERSCAN S250 / S250i legacy installs face evolving service-support timelines; programs evaluate explicitly.

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