VERIQA RT MonteCarlo 3D

3D Dose Calculation with SciMoCaTM

Accurate. Fast. Automated.

Monte Carlo techniques are the gold standard for dose calculation in radiotherapy. VERIQA RT MonteCarlo 3D calculates dose using the well-known, clinically proven SciMoCaTM Monte Carlo algorithm. VERIQA is independent of LINAC vendors and treatment planning systems, thus allowing a truly independent dose verification calculation. Calculation results are not only highly accurate, but also available in a few minutes.

As part of the VERIQA patient QA platform, VERIQA RT MonteCarlo 3D offers fully automated dose verification. By combining speed and accuracy, it can help you to enhance safety as well as increase efficiency in daily patient QA.

Why use RT MonteCarlo 3D?


Monte Carlo simulations are the most accurate method for dose calculation in radiotherapy treatment planning. With its ability to simulate the physics of photons and charged particles transport through matter, Monte Carlo can accurately compute the dose under almost any circumstances.

The advanced algorithm of VERIQA RT MonteCarlo 3D achieves a perfect balance between efficiency and accuracy.


VERIQA RT MonteCarlo 3D has been particularly designed for fast, accurate dose verification calculations in megavoltage external beam radiotherapy. With its advanced algorithm and unique virtual source modelling, it is superior in speed, maximizes efficiency and minimizes non-Gaussian noise.

VERIQA RT MonteCarlo 3D comes installed on a powerful server, allowing for very fast dose computations: Calculation results are available in less than 3 minutes.*


Due to the streamlined workflow, calculations run in the background – no user interaction required.



(* under common clinical conditions)


RT MonteCarlo 3D is a fully integrated module of the VERIQA patient QA platform, which automates workflows and streamlines all operations, requiring minimum user interaction.


Triggered by the transfer of treatment plans to VERIQA, RT MonteCarlo 3D knows what to do and will take care of all tasks – from calculation and evaluation to notification and documentation.


Lean back, relax, and let VERIQA RT MonteCarlo 3D do the work for you.


Due to its sophisticated beam modelling process, which is based on water phantom measurements, VERIQA RT MonteCarlo 3D performs truly independent dose calculations for a reliable secondary plan check.

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How to generate templates
Color Codes
Export Options
DVH Evaluation
Gamma Evaluation
Monte Carlo based MU and point dose verification
How to generate templates

How to generate templates

Color Codes

Color Codes

Export Options

Export Options

DVH Evaluation

DVH Evaluation

Gamma Evaluation

Gamma Evaluation

Monte Carlo based MU and point dose verification
Monte Carlo based MU and point dose verification

In addition to 3D-dose calculation, VERIQA RT MonteCarlo 3D provides a Monte Carlo based MU and point dose verification per beam.
If the 3D-evaluation leaves room for uncertainty, the 1D-evaluation offers the possibility to revert to the established MU-based check.
For each treatment plan, VERIQA automatically provides the per beam dose and MU information in the dose specification point defined in the TPS, with no additional effort for the user.

„VERIQA is a powerful QA platform which easily enabled us to implement a fully automated secondary Monte Carlo dose calculation for every of our patients.
The excellent accuracy and reliability of RT MonteCarlo 3D allowed us to reduce the amount of plan-specific phantom measurement by 75% - without compromising the quality and safety of our patient treatment.”

Dr. Bernhard Rhein, Medical Physicist, Heidelberg University Hospital

Learn about the VERIQA workflow

Treatment Machines

  • Varian:
    All C-arm based LINACs, including all MLC types
    and beam energies, various product names,
    Halcyon platform 6MV FFF
  • Elekta:
    All C-arm based LINACs, including all MLC types
    and beam energies, various product names
  • Accuray:
    CyberKnife®: all models, fixed diameter cones,
    IRIS, MLC-type InCise 2
  • TomoTherapy®: Hi-Art®, Radixact®

Standard beam models

  • Varian: Halcyon, TrueBeam®
  • Elekta: Versa HD
  • Accuray: TomoTherapy®



Treatment modes

All common treatment techniques, including: 3D, Wedges, IMRT, Arcs & VMAT, SBRT, SRS


Treatment planning systems

Any TPS capable of DICOM-RT export


Monte Carlo simulation techniques are widely used in medical physics. One can distinguish between general purpose Monte Carlo codes which can be applied to a wide range of problems and Monte Carlo codes that are specialized for specific purposes. VERIQA applies the SciMoCaTM Monte Carlo code which is a specialized code developed for the efficient calculation of radiation treatment dose.

For dose calculation, the Monte Carlo principle is used to predict the absorbed energy by simulating the individual transport of particles passing through matter. Monte Carlo therefore applies the knowledge of the patient geometry derived from imaging and the physical knowledge of particle interactions gained from experimental data. The sophisticated simulation of physical interactions is the reason why Monte Carlo is often considered the gold standard for dose calculation in radiation therapy.

A crucial aspect of accurate Monte Carlo simulations is the precise definition of the particle origin. In radiotherapy, the particle origin is described in linac-specific beam models that simulate the accelerator head.  

VERIQA RT MonteCarlo 3D applies is a specialized Monte Carlo code derived from the EGSnrc/XVMC/VMC++ Monte Carlo code family. It keeps deviations in the toughest artificial situations to a maximum of 2% compared to general purpose Monte Carlo codes. Due to its unique virtual beam modelling and optimized use of sophisticated variance reduction techniques, it maximizes efficiency and minimizes non-Gaussian noise.

VERIQA is an independent dose calculation tool. It is best suited for evaluating full 3D dose distributions for quality assurance purposes. By calculating dose in 3D, it provides dose information in millions of points. However, the traditional method of patient plan quality assurance is based on single point dose and Monitor Units (MU) as a measure of the released radiation.

For this reason, in addition to 3D dose evaluation, VERIQA provides a secondary point dose/MU check based on the independent Monte Carlo calculated dose in a specific dose point.

VERIQA does not use GPU base dose calculation. For the efficient simulation of the accelerator head and variable collimators, variance reduction techniques can be applied to great benefit. Variance reduction techniques come with an overhead in terms of memory management and at some cost in terms of code complexity. Both factors are a greater problem for a GPU architecture, which is specialized for executing the same set of instructions in parallel on many data entities (SIMD, single instruction, multiple data), than for a CPU architecture (MIMD, multiple instructions, multiple data). VERIQA is designed to be versatile and work with very diverse accelerator head geometries. It has a finely balanced suite of variance reduction techniques to couple the accelerator head model with the patient model. Therefore, the code executes preferentially on the CPU architecture.

VERIQA`s Monte Carlo algorithm was extensively benchmarked against EGSnrc. It was validated for materials between mass densities
of 0.25 g/cm3 and 8.0 g/cm3 and photon energies between 1 MeV and 25 MeV. The validation of the linac beam models was based on dose measurements under controlled conditions. Furthermore, comparison to measurements of realistic treatment plans served the purpose of comprehensive end-to-end testing.

Standard Beam Models:

Standard beam models can be used for linacs calibrated based on reference data sets provided by the linac vendors. These references are often referred to as golden beam data sets. In theory, all linacs tuned to golden beam data have the same dosimetric characteristics.

VERIQA’s standard beam models were created based on golden beam measurements and can be used for the dose calculation of linacs calibrated to golden beam data.  


Custom Beam Models:

Custom beam models can be applied for all linacs. VERIQA’s customized beam models are tailored to the specific characteristics of an individual linac based on water phantom and MLC measurements provided by the customer. The measurements are reviewed by PTW experts and used to create beam models meeting the highest quality standards.

Each VERIQA linac head is simulated with a type- and energy- specific beam model. VERIQA beam models are created by PTW experts based on water phantom and MLC calibration measurements. Beam models can either be provided as standardized or customized beam models.

Fully automated verification workflow of VERIQA RT MonteCarlo 3D

Clinical References

VERIQA RT MonteCarlo 3D uses the SciMoCaTM dose engine, which is based on the well-established EGSnrc/XVMC/VMC++ code family. The accuracy and reliability of the SciMoCa Monte Carlo algorithm have been validated in numerous clinical studies and publications:


„In practice, Monte Carlo dose calculation is only as accurate as the specific beam model for the customer´s linac.
SciMoCaTM was born from the belief that we can master this challenge for every customer.“


Prof. Dr. Markus Alber, Scientific RT GmbH

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