The NIH-funded TOPAS project made radiation therapy simulations using the Monte Carlo method easily accessible for the radiotherapy community. This repository brings the code to a new, truly open release stage called OpenTOPAS.
OpenTOPAS wraps and extends the Geant4 Simulation Toolkit to provide an easier-to-use application for the medical physicist. The parameter control system lets physicists assemble and control a rich library of simulation objects—geometry components, particle sources, scorers—without writing C++ or knowing Geant4 internals. Visit the User Guide for deeper dives.
The project was originally created out of an NIH-funded collaboration of Massachusetts General Hospital, University of California San Francisco, and SLAC National Accelerator Laboratory. Today, the UCSF and MGH teams continue to maintain and expand OpenTOPAS in partnership with the Monte Carlo community.
OpenTOPAS supports simulation of medical applications of ionizing radiation with the Monte Carlo method. Free availability is intended to aid research by medical physicists, radiobiologists, and clinicians across all radiotherapy modalities. New users should review the key publications to explore its potential.
