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RayStation’s unrivaled computation speed can radically transform your treatment planning process. As the computation time is measured in seconds rather than minutes, you can efficiently produce several competing treatment plans to assess different tradeoff situations and avoid interruptions. This has been shown to contribute to overall plan quality.


For example, decreasing calculation times for VMAT planning, from around 10-17 minutes for optimization and final dose calculation to around 2-4 minutes, significantly increased the fulfillment of clinical goals*.

RayStation also offers the possibility to use Monte Carlo dose algorithms**, providing the highest level of accuracy. All the calculations are run on GPU, enabling the outstanding results displayed here***.


Key Features

  • Monte Carlo (MC) algorithms for photon, electron and proton PBS
  • Collapsed Cone (CC) photon dose calculation engine
  • Singular value decomposition photon dose calculation engine for real-time purposes
  • Highly optimized proton pencil-beam algorithm
  • PBS carbon dose computation using pencil-beam dose engine and RBE dose computation


*Case Study “The effect of planning speed on VMAT plan quality.” Download case study below.
**MC dose for photons will be available to all RayStation users, but is limited to selected sites in
RayStation 8B
***Results may vary as dose computation time depends on several variables.


Photon dose calculation

Photon dose calculation contains the dose calculation engines for megavoltage photon beams, i.e. conventional Linacs.

It includes the separate workspace rayPhysics with advanced tools for beam modeling, such as partly automated beam modeling tools and the 3D beam modeling workspace wherein machine models and treatment plans can be evaluated for a real patient before being commissioned for clinical treatment.

  • Collapsed cone photon dose calculation engine with clinical accuracy (GPU supported).
  • Singular value decomposition photon dose calculation engine for real-time purposes.
  • Beam commissioning workspace with auto modeling.

Since we started using RayStation for IMRT planning, not a single plan has ever failed IMRT QA. It was not the case with
the planning systems we used before.

Hsiao-Ming Lu

Director of Clinical Physics Massachusetts General Hospital Harvard Medical School

Through vigorous testing of the photon dose algorithm in RayStation we found excellent agreement to measured data across four linacs, three head configurations, and two vendors. All data was found to be well within the published guidelines.

Jeremy Donaghue

M.S. Chief Medical Physicist Akron General Health System

Electron dose calculation

Electron dose calculation contains the dose engine and beam modeling and commissioning workspace for therapeutic electron beams.

  • Electron dose calculation engine uses a state-of-the art direct Monte Carlo code for energy transport in the patient and an in-house beam model to determine the phase space from the treatment unit head, including applicators.
  • Beam commissioning workspace.

Electron Monte Carlo offers anatomically based treatment planning which accurately accounts for in-patient inhomogeneities with fast dose computation times. The ability to combine and visualise eMC dose distributions with photon-based external beam techniques will facilitate improved plan optimisation in combined therapies and boost techniques.

Bon Mzenda

Ph.D. Chief Physicist Auckland Radiation Oncology

Proton dose calculation

Proton dose calculation contains the dose engines used for all proton treatment planning, and is the entry point to the different treatment techniques for protons.

The algorithm is a Fermi-Eyges-based pencil beam algorithm which can be used within the optimization loop and for final dose calculation.

  • Pencil beam - highly optimized algorithm with 19-fold multi tracing per spot and separate handling of the nuclear halo effect.
  • Monte Carlo (MC) dose engine for proton pencil beam scanning (PBS) plans, which can be used in parallel with the existing pencil beam dose engine.

Download the white paper below to read more.


The Provision Center for Proton Therapy was the first proton therapy center to treat patients using the RayStation treatment planning system. The data required by the RayStation pencil beam dose calculation algorithm was measured during three 8 hour beam shifts and was sent to RaySearch to prepare the beam data model for our system. The RayStation system modeled the data near perfectly. We are very happy with the data modeling and the exceptionally good agreement between measured and calculated data for our uniform scanning beam delivery system.

Niek Schreuder

M.Sc. Chief Medical Physicist Provision Center for Proton Therapy

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Carbon dose calculation

Carbon dose calculation contains the dose and radiobiological effect (RBE) computation algorithms used for the carbon ion treatment planning, and is the entry point to the different treatment techniques for carbon ions.

The dose computation algorithm is a Fermi-Eyges-based pencil beam algorithm which can be used within the optimization loop and for final dose calculation. It can be used with or without inclusion of RBE dose weighting.

  • The biological dose algorithm computes RBE weighted dose according to the Local Effect Model. Optionally, RBE weighted dose may be computed with a fast algorithm according to the "low-dose approximation".
  • The code is highly optimized taking longitudinal and lateral heterogeneities into account and with explicit handling of the nuclear halo effect.
  • The machine model supports cyclotrons as well as synchrotron delivery systems (e.g. of the types used at MedAustron/Austria and CNAO/Italy).
  • Executes on GPU or CPU depending on which is the fastest available.
 *Regulatory clearance is needed in some markets

“MedAustron regards itself as an interdisciplinary and nationwide Austrian centre. It will specialize in cancer treatment with ions other than protons, the research and development of this new therapy and non-clinical research with ion and proton irradiation. 

Even amongst other similar centres, MedAustron is an unique project. There nearly is no off-shelf equipment for our specific requirements, concerning neither hard- nor software. One of the biggest challenges is therefore to find suppliers for all the needed equipment, who are able and willing to develop suitable devices according to our specific requirements. 

We chose RayStation because it's the most innovative system available and it's able to fulfill the high demands we make on our dose delivery system. From the first moment on RaySearch showed the flexibility and high competence, alike, necessary for such a demanding partnership.”

Dr. Bernd Mößlacher

Managing Director at Medaustron, Austria.

“RayStation's high calculation speed provided an immediately noticeable improvement over the centre's previous treatment planning system. In the PACE prostate VMAT SABR trial, RayStation cut the time for optimization and calculation of final dose from 40 minutes to just 3 minutes. This high speed also makes it possible for the planner to perform a reoptimization while the clinician is still present, ensuring a highly effective process.”

Chris Walker
Head of Radiotherapy Physics,
The Northern Centre for Cancer Care, UK

read the RayStation Dose Calculation Algorithms white paper
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