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Fast and Accurate
Dose computation

Speed and accuracy for superior plan quality

Radically transform your treatment planning process with the unrivaled speed of RayStation. Computation is measured in seconds rather than minutes, so 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.

Decreasing calculation times for VMAT planning – from around 10-17 minutes for optimization and final dose calculation to around 2-4 minutes – significantly increases the fulfillment of clinical goals*. RayStation also offers the possibility to use Monte Carlo dose algorithms**, providing the highest level of accuracy. All calculations are run on GPU to enable outstanding results like those displayed here***.

Key Features

  • Extremely fast GPU based Monte Carlo dose engine for optimization and final dose of proton PBS plans with calculation times typically under five seconds
  • Collapsed Cone (CC) photon dose calculation engine
    Singular value decomposition photon dose calculation engine for real-time purposes
  • Efficient Monte Carlo (MC) for electron treatments
  • Pencil-beam algorithm for proton PBS and broad beam techniques
  • PBS carbon and helium dose computation using pencil-beam dose engine and RBE dose computation


* Case study: “The effect of planning speed on VMAT plan quality.” Download below.

** Results may vary as dose computation time depends on several variables.


Download and read about VMAT plan quality

Photon dose calculation

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

  • High-accuracy photon Monte Carlo (MC) dose calculation algorithm
  • Collapsed cone photon dose calculation engine with clinical accuracy
  • 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 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 with auto-modeling.

“In a field as sophisticated as radiotherapy, reducing your patient to a cube of water for planning electron can feel odd. It’s reassuring to know we have RayStation’s Monte Carlo models of our electron beams to rely on instead. It gives us a better idea how the beam interacts with inhomogeneities or extreme surface irregularities and lets us adapt our initial plans to get the distribution right. We first commissioned our electron beams in November 2015. Being able to create the models ourselves has given us greater control over the accuracy we can achieve with our data. Calculation times are fast, meaning we don't have to compromise on plan quality.

​Adrian Lonsdale

Head of Treatment Planning Physics, Principal Clinical Scientist, Ninewells Hospital, Dundee

Proton dose calculation

Proton PBS therapy is an extremely precise treatment technique that is highly sensitive to patient anatomy and beam limiting devices such as range shifters and apertures. RayStation therefore offers a state-of-the-art Monte Carlo (MC) dose engine that can be used for both optimization and final dose computation. The RayStation MC dose engine has been developed from scratch for the purpose of proton therapy and has recently been adopted to run on the GPU. This means that clinical MC dose in RayStation is available in a matter of seconds rather than hours.

For the less demanding broad beam techniques, such as Double Scattering, Uniform Scanning, and Wobbling, RayStation is using a pencil-beam based analytical algorithm that accurately accounts for e.g. the multiple coulomb scattering that occurs in the range compensator as well as in in the patient.

“The implementation of the RayStation Monte Carlo dose engine has expanded our capability to serve more and a wider range of patients. For example, it enabled us to use larger range shifter to patient air gaps, which streamlined our process in the treatment rooms. In addition, the higher accuracy of the Monte Carlo dose engine allowed us to treat sites like lung, complicated head and neck, and breast with more confidence.

Chang Chang

Director of Physics, Texas Center for Proton Therapy

“Now, when we find a rare deviation in our patient specific QA, we always double check our QA setup and data first. We simply expect the RayStation Monte Carlo dose to be correct, and we have yet to see a field that fails the QA.”

Xavier Vermeren

Chief physicist, West German Proton Therapy Centre Essen


Carbon and helium dose calculation

Carbon and helium dose calculation contains the dose and relative biological effectiveness (RBE) computation algorithms used for the light ion treatment planning, and is the entry point to the different treatment techniques for light 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 RBE weighted dose computation is implemented using the Local Effect Model and the Mikrodosimetric Kinetic Model. A specific module, RayBiology, can be used for handling of biological models.
  • 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).
  • The dose computation executes on GPU.
 *Regulatory clearance is needed in some markets

“The MedAustron Ion Therapy Centre is Austrians first and only particle therapy centre providing protons and carbon ions to their patients. Since 2016 we are in clinical operation with protons and added carbon ions as additional treatment option since 2019.

MedAustron is providing high quality of care with a cutting edge technology developed for and with our team with respect to robotic patient alignment system and in-room position verification, precise active scanned beam delivery and finally also high end software solutions. The powerful features of RayStation and its ability to plan carbon ion treatments was a must have for our clinical environment. Additionally highly innovative products like RayCare and RayCommand will soon also get implemented at MedAustron which we are very much looking forward too.

We have a very long and friendly partnership with RaySearch since the beginning and are thankful for a close collaboration also with the highly motivated development team.”

Markus Stock

Priv. Doz. DI Markus Stock, PhD Head of Medical Physics, MedAustron Ion Therapy Centre

“RayStation's high calculation speed provided an immediately noticeable improvement over the center'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 re-optimization while the clinician is still present, ensuring a highly effective process.”

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


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