Varian Medical Systems
The dominant manufacturer in external-beam radiation therapy globally. Varian and Elekta together account for roughly three-quarters of the world's clinical linear-accelerator install base; Varian holds approximately one-third of global market share, with Elekta accounting for the larger remainder. The TrueBeam and Clinac iX platforms are the most common linacs a radiation-oncology department will encounter in service today. Varian became a subsidiary of Siemens Healthineers in April 2021 — the first time in modern industry history that a single corporate entity spans diagnostic imaging and radiation oncology at scale.
Company history
- 1948 — Varian Associates founded in Palo Alto by Russell and Sigurd Varian (inventors of the klystron — the RF power source that makes clinical linear accelerators possible).
- 1999 — the medical business was spun off from Varian Associates as Varian Medical Systems. The parent company was restructured into three independent public entities (Varian Medical Systems, Varian Semiconductor, Varian Inc.).
- 2004 — Clinac iX released — the C-arm linac platform that would define community and academic radiation-oncology practice through the 2000s and 2010s.
- 2008 — acquired ACCEL Instruments (proton therapy — contributed to later ProBeam development).
- 2010 — TrueBeam launched — successor to the Clinac lineage with new control system, higher dose rate, and image-guided radiotherapy (IGRT) built into the chassis.
- 2012 — TrueBeam STx configuration released — SRS/SBRT-specific variant with HD120 MLC and PerfectPitch 6DoF couch, partnered with Brainlab's Novalis radiosurgery program.
- 2017 — Halcyon released — O-ring ring-gantry linac designed for high-throughput conventional RT with simplified commissioning.
- 2020 — Ethos platform released — AI-driven adaptive radiotherapy on a Halcyon-class ring-gantry base.
- August 2020 → April 2021 — acquired by Siemens Healthineers for approximately $16.4 billion. Varian becomes a Siemens Healthineers subsidiary; continues to operate under the Varian brand for product naming.
Product lines
Linear accelerators (external-beam RT)
- Clinac iX family — 2004–2014 C-arm workhorse; largest deployed linac population globally. Variants: Clinac iX 6+15 MV, Clinac iX 6+18 MV.
- Trilogy — predecessor-class C-arm linac with OBI.
- TrueBeam — current C-arm flagship (2010–present).
- TrueBeam STx — SRS / SBRT-focused TrueBeam with HD120 MLC and PerfectPitch 6DoF couch.
- Edge — dedicated radiosurgery platform.
- Halcyon — O-ring ring-gantry linac for high-throughput conventional RT.
- Ethos — Halcyon-based AI-adaptive radiotherapy platform.
Proton therapy
- ProBeam — single-room and multi-room proton therapy systems.
Brachytherapy
- GammaMed Plus HDR — high-dose-rate afterloader.
- BRAVOS — newer HDR afterloader.
Oncology software
- ARIA — oncology information system (OIS). Integrates imaging, RT planning, and EMR workflows.
- Eclipse — treatment planning system (TPS). Industry-reference photon and proton TPS.
Market position
- Linear accelerators — roughly 33% global share (vs Elekta ~42%); combined with Elekta, ~75% of worldwide linac installs.
- SRS/SBRT — TrueBeam STx and Edge are the dominant linac-based radiosurgery platforms; primary competition from Accuray CyberKnife and Leksell Gamma Knife Icon.
- Proton therapy — one of two dominant OEMs globally (alongside IBA).
- Adaptive RT — Ethos and Halcyon are Varian's entry into high-throughput and AI-adaptive radiation therapy markets.
Post-Siemens Healthineers acquisition
- Product branding retained as Varian.
- Integration with Siemens Healthineers imaging (CT simulation, MR-linac pathways) is an active roadmap theme.
- Siemens Healthineers becomes the only OEM spanning premium diagnostic imaging plus radiation therapy under one corporate entity.
Service and regulatory reality
- Dedicated shielded vault, state radiation license, Qualified Medical Physicist, Radiation Safety Officer, and TG-142 (TG-142) commissioning and ongoing QA per AAPM professional-society guidance.
- Service networks — OEM service is standard; mature aftermarket service for Clinac iX where klystron / waveguide / thyratron expertise is widely available.