Introducing the SciMoCa™ secondary dose check & plan QA software…
The SciMoCa™ dose engine shares its fundamental concepts with the voxel Monte Carlo (VMC) family of codes, e.g. VMC++ or XVMC [4-6], coupled with a powerful and versatile virtual source model (VSM) that is based on published concepts [7-9].

Clinical Examples

SciMoCa™ sets new standards in accuracy and speed in radiotherapy dose computation [1,2,3]…


Comparison to other industry-leading TPS-dose calculation algorithms shows excellent agreement: Comparison to Varian Acuros Comparison to Accuray Precision MC

Computational performance Linacs

calculation times

Computational performance Cyberknife®

calculation times Cyberknife-plans

SciMoCa™ Concept for Monte-Carlo Beam Commissioning

Virtual source models can contain very fine detail, but are much more efficient than explicit simulations (e.g. BEAMnrc) or phase space files. A virtual source model has a number of parameters: Adjustment becomes necessary because the spectrum of primary photons from the electron target depends on:

Example: Elekta 6MV FF Benchmark

Customer data: Exceptionally good quality of the measurements.
⇒ Excellent beam-model fit of depth-dose-curves over the full range of field sizes… Elekta 6MV FF Benchmark: Depth-dose profiles
⇒ Excellent beam-model fit of output-factors over the full range of field sizes… Elekta 6MV FF Benchmark: Output-factors

Worldwide Installations of SciMoCa™

Worldwide Installations of SciMoCa

SciMoCa™ secondary dose check & plan QA: Webinars


[1] Stanhope CW, Drake DG, Liang J, Alber M, Söhn M, Habib C, Willcut V, Yan D. Evaluation of Machine Log-Files/MC based Treatment Planning and Delivery QA as Compared to ArcCHECK QA. Med Phys. 2018 Jul;45(7):2864-2874

[2] Hoffmann L, Alber M, Söhn M, Elstrøm UV. Validation of the Acuros XB dose calculation algorithm versus Monte Carlo for clinical treatment plans. Med Phys. 2018 Aug;45(8):3909-3915

[3] Milder MTW, Alber M, Söhn M, Hoogeman MS. Commissioning and clinical implementation of the first commercial independent Monte Carlo 3D dose calculation to replace CyberKnife M6™ patient-specific QA measurements. JACMP 2020 Nov;21(11):304-311

[4] Kawrakow I, Fippel M, Friedrich K. 3D electron dose calculation using a Voxel based Monte Carlo algorithm (VMC). Med Phys. 1996;23:445-57.

[5] Kawrakow I. Improved modeling of multiple scattering in the Voxel Monte Carlo model. Med Phys. 1997 Apr;24:505-17.

[6] Kawrakow I, Fippel M. Investigation of variance reduction techniques for Monte Carlo photon dose calculation using XVMC. Phys Med Biol. 2000;45:2163-83.

[7] Sikora M, Dohm O, Alber M. A virtual photon source model of an Elekta linear accelerator with integrated mini MLC for Monte Carlo based IMRT dose calculation. Phys Med Biol. 2007;52:4449-63.

[8] Sikora M, Alber M. A virtual source model of electron contamination of a therapeutic photon beam. Phys Med Biol. 2009;54:7329-44.

[9] Sikora M, Virtual Source Modelling of Photon Beams for Monte Carlo Based Radiation Therapy Treatment Planning. PhD thesis.