+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | medical_linac | + + | README | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ This application has been developed by the Geant4 users: *Silvia Pozzi and *Barbara Caccia with the support of ^Carlo Mancini Terracciano Past contributros: $Claudio Andenna, Pablo Cirrone, Alessandro Occhigrossi*. S. Guatelli+ Michela Piergentili with the support of M.G.Pia and Franca Foppiano. *Istituto Superiore di Sanita' and INFN Roma, Italy ^Physics Dep. - Univ. La Sapienza and INFN Roma, Italy %LNS-INFN Catania, Italy +University of Wollongong, Autralia $INAIL DIPIA - ex ISPESL and INFN Roma, gruppo collegato Sanita', Italy ---> A brief description The example is a deep update of the previous version for medlinac. The example is based on a medical accelerator used in a intercomparison exercise managed by working Group6 (Computational Dosimetry) of Eurados network (B.Caccia et al. "A model validation scheme for Monte Carlo simulations of a medical linear accelerator: geometrical description and dosimetric data used in the “Linac Action”- free download from https://eurados.sckcen.be/sites/eurados/files/uploads/Report-Publications/Reports/2020/EURADOS%20Report%202020-05.pdf). The medical accelerator is a GE Saturn 43 LINAC. The given description of the Saturn 43 LINAC corresponds to an operational mode with an acceleration voltage of 12 MV in the photon mode with collimator settings for a 10x10 cm^2 field size at standard working distance. Experimental dosimetric data are disposable and are related to a cubic water phantom of a 40x40x40 cm3 polymethyl methacrylate (PMMA) water tank filled with distilled water. At the front of the phantom, the thickness of PMMA crossed by the beam is 4 mm (15 mm for the all other walls of the phantom). The distance from the source point of the target to the external entrance window of the water phantom is 90 cm. The example package contains: - source files (src, include, macros) - CMakeLists.txt - README.txt - main.cc --------------------------------------------------------------- ----> 1. Experimental set-up. The elements simulated are: 1 - A source of electrons. The beam direction is along the z axis. 2 - A target 3 - A primary collimator 4 - A vacuum window 5 - A flattening filter 6 - A ion chamber 7 - Secondary movable collimators (jaws) 8 - A cubic phantom filled with water -------------------------------------------------------------- ----> 2. How to run the example. The example runs with the run.mac macro file. ----------------------------------------------------------------------- ----> 4. The physics The PhysicsList class allows the activation of all the physic models via the macro file. The standard electromagnetic option3 model is the default model. ------------------------------------------------------------------------ ----> 5. Simulation output The output of the medlinac example is generated by the Geant4 command-based scorer doseDeposit. ------------------------------------------------------------------------ ----> 6. Main differences with the previous ML2 release. Multithreading has been implemented and a real accelerator was used, with experimental data for dose profiles and deep percentage dose with which to check the results obtained in the simulation. ------------------------------------------------------------------------ ----> 7. Contacts If you have any questions or wish to notify of updates and/or modification please contact: Silvia Pozzi at silvia.pozzi@iss.it Barbara Caccia at barbara.caccia@iss.it Istituto Superiore di Sanita' and INFN Roma, Italy Viale Regina Elena 299, 00161 Roma (Italy)