Introducing SciMoCa, our client-server based Monte-Carlo dose calculation service that sets new standards in accuracy and speed in radiotherapy dose computation... [1, 2] SciMoCa Client-Server architecture SciMoCa-Client SciMoCa-Server

The SciMoCa dose engine shares its fundamental concepts with the voxel Monte Carlo (VMC) family of codes, e.g. VMC++ or XVMC [3 - 5], coupled with a powerful and versatile virtual source model (VSM) that is based on published concepts [6 - 8].

calculation times

SciMoCa supports all types of conventional linacs from Elekta, Varian (including Halcyon*) and Siemens, as well as the Accuray® TomoTherapy® *, Radixact® * and CyberKnife®-systems:
(*) pending regulatory clearance

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:

Benchmark Elekta 6MV FF: Depth-dose profiles Benchmark Elekta 6MV FF: Output-factors


[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 Apr 20 [Epub ahead of print]

[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 Jun 16 [Epub ahead of print]

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

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

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

[6] 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.

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

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