CONICET | Buscador de Institutos y Recursos Humanos

RTHC (Radioterapia de Haz Convergente) is a new proposal technique for external radiotherapybased on a single convergent photons beam by means of a device capable to generate a singlebeam of convergent X photons. Previous studies [1] have shown that a primary beam of thesecharacteristics provides excellent dosimetric results with a dose peak close to the isocenter,similar those used for hadron therapy treatment. To determine the physical and dosimetriccharacteristics of a device convergent X photons beam and its potential to be used in clinicaltreatments. Analytical developments plus software that allows determining the necessary fields(electrostatic and/or magnetic fields) for electrons trajectory control are used. Monte Carlosimulation code (PENELOPE) is applied to a specially designed geometry for the generation of aconvergent photons beam. We determined the values of the magnetic and/or electric fields tohandle the convergent beam device for an electrons? energy range from 0.1 to 20 MeV. Angulardistribution curves of the bremsstrahlung were determined for different thicknesses and incidentelectrons energies (0.4 to 6.0 MeV), plus the respective doses distribution in each case,characterized by a high dose concentration, close to the isocenter. We can conclude that thephysical and dosimetric characteristics of convergent beam device radiotherapy have beendetermined. The achieved results show that it is possible to develop a convergent beamprototype of low and high energy as a single unit or to be adapted to an existing radiation-therapy LINAC, so this might be used either in the conventional mode or in the conventionalone, depending on the case.[1] R. Figueroa and M. Valente, Feasibility and dosimetric characterization of singleconvergent beam teletherapy RTHC, submitted to Medical Physics, 2013.